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Latest Amazon ANS-C00 dumps practice test questions

1.

In order to change the name of the AWS Config ____, you must stop the configuration recorder, delete the current one, and create a new one with a new name, since there can only be one of this per AWS account.

A. SNS topic
B. configuration history
C. delivery channel
D. S3 bucket path

Explanation: As AWS Config continually records the changes that occur to your AWS resources, it sends notifications and updated configuration states through the delivery channel. You can manage the delivery channel to control where AWS Config sends configuration updates.

You can have only one delivery channel per AWS account, and the delivery channel is required to use AWS Config. To change the delivery channel name, you must delete it and create a new delivery channel with the desired name.

Before you can delete the delivery channel, you must temporarily stop the configuration recorder. The AWS Config console does not provide the option to delete the delivery channel, so you must use the AWS CLI, the AWS Config API, or one of the AWS SDKs.

Reference: http://docs.aws.amazon.com/config/latest/developerguide/update-dc.html

2.

How many tunnels do you get with each VPN connection hosted by AWS?

A. 4
B. 1
C. 2
D. 8

Explanation:
All AWS VPNs come with 2 tunnels for resiliency.

3.

Your organization runs a popular e-commerce application deployed on AWS that uses autoscaling in conjunction with an Elastic Load Balancing (ELB) service with an HTTPS listener. Your security team reports that an exploitable vulnerability has been discovered in the encryption protocol and cipher that your site uses.

Which step should you take to fix this problem?

A. Generate new SSL certificates for all web servers and replace current certificates.
B. Change the security policy on the ELB to disable vulnerable protocols and ciphers.
C. Generate new SSL certificates and use ELB to front-end the encrypted traffic for all web servers.
D. Leverage your current configuration management system to update SSL policy on all web servers.

4.

A company is deploying a critical application on two Amazon EC2 instances in a VPC. Failed client connections to the EC2 instances must be logged according to company policy.

What is the MOST cost-effective solution to meet these requirements?

A. Move the EC2 instances to a dedicated VPC. Enable VPC Flow Logs with a filter on the deny action. Publish the flow logs to Amazon CloudWatch Logs.
B. Move the EC2 instances to a dedicated VPC subnet. Enable VPC Flow Logs for the subnet with a filter on the reject action. Publish the flow logs to an Amazon Kinesis Data Firehose stream with data delivery to an Amazon S3 bucket.
C. Enable VPC Flow Logs, filtered for rejected traffic, for the elastic network interfaces associated with the instances. Publish the flow logs to an Amazon Kinesis Data Firehose stream with data delivery to an Amazon S3 bucket.
D. Enable VPC Flow Logs, filtered for rejected traffic, for the elastic network interfaces associated with the instances. Publish the flow logs to Amazon CloudWatch Logs.

5.

A company installed an AWS Site-to-Site VPN and configured it to use two tunnels. The company has learned that the VPN connectivity is unstable. During a ping test from the on-premises data center to AWS, a network engineer notices that the first few ICMP replies time out but that subsequent requests are successful.

The AWS Management Console shows that the status for both tunnels last changed at the same time the ping responses were successfully received. Which steps should the network engineer take to resolve the instability? (Choose two.)

A. Enable dead peer detection (DPD) on the customer gateway device.
B. Change the tunnel configuration to active/standby on the virtual private gateway.
C. Use AS-PATH prepending on one path to cause all traffic to prefer that tunnel.
D. Send ICMP requests to an instance in the VPC every 5 seconds from the on-premises network.
E. Use a higher multi-exit discriminator (MED) value on the preferred path to prefer that tunnel.

6.

A company wants to enforce a compliance requirement that its Amazon EC2 instances use only on-premises DNS servers for name resolution. Outbound DNS requests to all other name servers must be denied. A network engineer configures the following set of outbound rules for a security group:

The network engineer discovers that the EC2 instances are still able to resolve DNS requests by using Amazon DNS servers inside the VPC.

Why is the solution failing to meet the compliance requirement?

A. The security group cannot filer outbound traffic to the Amazon DNS servers.
B. The security group must have inbound rules to prevent DNS requests from coming back to EC2 instances.
C. The EC2 instances are using the HTTPS port to send DNS queries to Amazon DNS servers.
D. The security group cannot filter outbound traffic to destinations within the same VPC.

7.

Your company is expanding its cloud infrastructure and moving many of its flat files and static assets to S3. You currently use a VPN to access your compute infrastructure, but you require more reliability for your static files as you are offloading all of your important data to AWS.

What is your best course of action while keeping costs low?

A. Create a Direct Connect connection using a Private VIF to access both compute and S3 resources.
B. Create an S3 endpoint and create a route to the endpoint prefix list for your VPN to allow access to your S3 resources.
C. Create two Direct Connect connections. Each is connected to a Private VIF to ensure maximum resiliency.
D. Create a Direct Connect connection using a Public VIF and route your VPN over the DX connection to your VPN endpoint.

Explanation:
An S3 endpoint cannot be used with a VPN. A Private VIF cannot access S3 resources. A Public VIF with a VPN will ensure security for your compute resources and access to your S3 resources. Two DX connections are very expensive and a Private VIF still won\\’t allow access to your S3 resources.

8.

You need to create a subnet in a VPC that supports 1000 hosts. You need to be as accurate as possible since you run a very large company. What CIDR should you use?

A. /16
B. /24
C. /7
D. /22

Explanation:
/22 supports 1019 hosts since AWS reserves 5 addresses.

9.

You are configuring a VPN to AWS for your company. You have configured the VGW and CGW. You have created the VPN. You have also run the necessary commands on your router. You allowed all TCP and UDP traffic between your data center and your VPC.

The tunnel still doesn\\’t come up. What is the most likely reason?

A. You forgot to turn on route propagation in the routing table.
B. You do not have a public ASN.
C. Your advertised subnet is too large.
D. You haven\\’t added protocol 50 to your firewall.

Explanation:
You haven\\’t allowed protocol 50 through the firewall. Protocol 50 is different from UDP (17) and TCP (6) and requires a rule in your firewall for your VPN tunnel to come up.

10.

Which two choices can serve as a directory service for WorkSpaces? (Choose two.)

A. Simple AD
B. Enhanced AD
C. Direct Connection
D. AWS Microsoft AD

Explanation:
There is no such thing as “Enhanced AD” and DX is not a directory service.

11.

Each custom AWS Config rule you create must be associated with a(n) AWS ____, which contains the logic that evaluates whether your AWS resources comply with the rule.

A. Lambda function
B. Configuration trigger
C. EC2 instance
D. S3 bucket

Explanation: You can develop custom AWS Config rules to be evaluated by associating each of them with an AWS Lambda function, which contains the logic that evaluates whether your AWS resources comply with the rule.

You associate this function with your rule, and the rule invokes the function either in response to configuration changes or periodically. The function then evaluates whether your resources comply with your rule, and sends its evaluation results to AWS Config.

Reference: http://docs.aws.amazon.com/config/latest/developerguide/evaluate-config_develop-rules.html

12.

After setting an AWS Direct Connect, which of the following cannot be done with an AWS Direct Connect Virtual Interface?

A. You can delete a virtual interface; if its connection has no other virtual interfaces, you can delete the connection.
B. You can change the region of your virtual interface.
C. You can create a hosted virtual interface.
D. You can exchange traffic between the two ports in the same region connecting to different Virtual Private Gateways (VGWs) if you have more than one virtual interface.

Explanation: You must create a virtual interface to begin using your AWS Direct Connect connection. You can create a public virtual interface to connect to public resources or a private virtual interface to connect to your VPC.

Also, it is possible to configure multiple virtual interfaces on a single AWS Direct Connect connection, and you\\’ll need one private virtual interface for each VPC to connect to.

Each virtual interface needs a VLAN ID, interface IP address, ASN, and BGP key. To use your AWS Direct Connect connection with another AWS account, you can create a hosted virtual interface for that account.

These hosted virtual interfaces work the same as standard virtual interfaces and can connect to public resources or a VPC.

Reference: http://docs.aws.amazon.com/directconnect/latest/UserGuide/WorkingWithVirtualInterfaces.html

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2022 latest AWS Certified Specialty ANS-C00 practice tests

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QUESTION 1

A company is deploying a non-web application on an Elastic Load Balancing. All targets are servers located on-premises that can be accessed by using AWS Direct Connect.

The company wants to ensure that the source IP addresses of clients connecting to the application are passed all the way to the end server.

How can this requirement be achieved?

A. Use a Network Load Balancer to automatically preserve the source IP address.
B. Use a Network Load Balancer and enable the X-Forwarded-Forattribute.
C. Use a Network Load Balancer and enable the ProxyProtocolattribute.
D. Use an Application Load Balancer to automatically preserve the source IP address in the XForwarded-Forheader.

QUESTION 2

To directly manage your CloudTrail security layer, you can use ____ for your CloudTrail log files

A. SSE-S3
B. SCE-KMS
C. SCE-S3
D. SSE-KMS

Explanation: By default, the log files delivered by CloudTrail to your bucket are encrypted by Amazon server-side encryption with Amazon S3-managed encryption keys (SSE-S3). To provide a security layer that is directly manageable, you can instead use server-side encryption with AWS KMS-managed keys (SSE-KMS) for your CloudTrail log files.

Reference: http://docs.aws.amazon.com/awscloudtrail/latest/userguide/encrypting-cloudtrail-log-files-withaws-kms.html

QUESTION 3

DNS name resolution must be provided for services in the following four zones: The contents of these zones are not considered sensitive, however, the zones only need to be used by services hosted in these VPCs, one per geographic region. Each VPC should resolve the names in all zones.

How can you use Amazon route 53 to meet these requirements?

A. Create a Route 53 Private Hosted Zone for each of the four zones and associate them with the three VPCs.
B. Create a single Route 53 Private Hosted Zone for the zone company.private.and associate it with the three VPCs.
C. Create a Route Public 53 Hosted Zone for each of the four zones and configure the VPC DNS Resolver to forward
D. Create a single Route 53 Public Hosted Zone for the zone company. private. and configure the VPC DNS Resolver to forward

QUESTION 4

A network engineer has configured a private hosted zone using Amazon Route 53. The engineer needs to configure health checks for recordsets within the zone that are associated with instances.
How can the engineer meet the requirements?

A. Configure a Route 53 health check to a private IP associated with the instances inside the VPC to be checked.
B. Configure a Route 53 health checkpointing to an Amazon SNS topic that notifies an Amazon CloudWatch alarm when the Amazon EC2 StatusCheckFailed metric fails.
C. Create a CloudWatch metric that checks the status of the EC2 StatusCheckFailed metric, add an alarm to the metric, and then create a health check that is based on the state of the alarm.
D. Create a CloudWatch alarm for the StatusCheckFailed metric and choose to Recover this instance, selecting a threshold value of 1.

QUESTION 5

A company has an AWS Direct Connect connection between its on-premises data center and Amazon VPC. An application running on an Amazon EC2 instance in the VPC needs to access confidential data stored in the on-premises data center with consistent performance. For compliance purposes, data encryption is required.

What should the network engineer do to meet these requirements?

A. Configure a public virtual interface on the Direct Connect connection. Set up an AWS Site-to-Site VPN between the customer gateway and the virtual private gateway in the VPC.
B. Configure a private virtual interface on the Direct Connect connection. Set up an AWS Site-to-Site VPN between the
customer gateway and the virtual private gateway in the VPC.
C. Configure an internet gateway in the VPC. Set up a software VPN between the customer gateway and an EC2 instance in the VPC.
D. Configure an internet gateway in the VPC. Set up an AWS Site-to-Site VPN between the customer gateway and the virtual private gateway in the VPC.

QUESTION 6

A company is running services in a VPC with a CIDR block of 10.5.0.0/22. End users report that they no longer can provision new resources because some of the subnets in the VPC have run out of IP addresses.

How should a network engineer resolve this issue?

A. Add 10.5.2.0/23 as a second CIDR block to the VPC. Create a new subnet with a new CIDR block and provision new resources in the new subnet.
B. Add 10.5.4.0/21 as a second CIDR block to the VPC. Assign a second network from this CIDR block to the existing subnets that have run out of IP addresses.
C. Add 10.5.4.0/22 as a second CIDR block to the VPC. Assign a second network from this CIDR block to the existing subnets that have run out of IP addresses.
D. Add 10.5.4.0/22 as a second CIDR block to the VPC. Create a new subnet with a new CIDR block and provision new resources in the new subnet.

Explanation: To connect to public AWS products such as Amazon EC2 and Amazon S3 through the AWS Direct Connect, you need to provide the following: A public Autonomous System Number (ASN) that you own (preferred) or a private ASN. Public IP addresses (/30) (that is, one for each end of the BGP session) for each BGP session. The public routes that you will advertise over BGP.

Reference: http://docs.aws.amazon.com/directconnect/latest/UserGuide/Welcome.html

QUESTION 8

You have a DX connection and a VPN connection as backup for your 10.0.0.0/16 network. You just received a letter indicating that the colocation provider hosting the DX connection will be undergoing maintenance soon. It is critical that you do not experience any downtime or latency during this period.
What is the best course of action?

A. Configure the VPN as a static VPN instead of a dynamic one.
B. Configure AS_PATH Prepending on the DX connection to make it the less preferred path.
C. Advertise 10.0.0.0/9 and 10.128.0.0/9 over your VPN connection.
D. None of the above.

Explanation:
A more specific route is the only way to force AWS to prefer a VPN connection over a DX connection. A /9 is not more specific than a /16.

QUESTION 9

Which statement is NOT true about accessing remote AWS region in the US by your AWS Direct Connect which is located in the US?

A. To connect to a VPC in a remote region, you can use a virtual private network (VPN) connection over your public virtual interface.
B. To access public resources in a remote region, you must set up a public virtual interface and establish a border gateway protocol (BGP) session.
C. If you have a public virtual interface and established a BGP session to it, your router learns the routes of the other AWS regions in the US.
D. Any data transfer out of a remote region is billed at the location of your AWS Direct Connect data transfer rate.

Explanation:
AWS Direct Connect locations in the United States can access public resources in any US region. You can use a single AWS Direct Connect connection to build multi-region services. To connect to a VPC in a remote region, you can use a virtual private network (VPN) connection over your public virtual interface.

To access public resources in a remote region, you must set up a public virtual interface and establish a border gateway protocol (BGP) session. Then your router learns the routes of the other AWS regions in the US. You can then also establish a VPN connection to your VPC in the remote region. Any data transfer out of a remote region is billed at the remote region data transfer rate.

Reference: http://docs.aws.amazon.com/directconnect/latest/UserGuide/remote_regions.html

QUESTION 10

Your application server instances reside in the private subnet of your VPC. These instances need to access a Git repository on the Internet. You create a NAT gateway in the public subnet of your VPC. The NAT gateway can reach the Git repository, but instances in the private subnet cannot.

You confirm that a default route in the private subnet route table points to the NAT gateway. The security group for your application server instances permits all traffic to the NAT gateway.
What configuration change should you make to ensure that these instances can reach the patch server?

A. Assign public IP addresses to the instances and route 0.0.0.0/0 to the Internet gateway.
B. Configure an outbound rule on the application server instance security group for the Git repository.
C. Configure inbound network access control lists (network ACLs) to allow traffic from the Git repository to the public subnet.
D. Configure an inbound rule on the application server instance security group for the Git repository.

Explanation: The traffic leaves the instance destined for the Git repository; at this point, the security group must allow it through.

The route then directs that traffic (based on the IP) to the NAT gateway. This is wrong because it removes the private aspect of the subnet and would have no effect on the blocked traffic anyway. C is wrong because the problem is that outgoing traffic is not getting to the NAT gateway. D is wrong because to allow outgoing traffic to the Git repository requires an outgoing security group rule.

QUESTION 11

What is the maximum size of a response body that Amazon CloudFront will return to the viewer?

A. Unlimited
B. 5 GB
C. 100 MB
D. 20 GB

Explanation:
The maximum size of a response body that CloudFront will return to the viewer is 20 GB.

Reference: http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/
RequestAndResponseBehaviorS3Origin.html#ResponseBehaviorS3Origin

QUESTION 12

An organization processes consumer information submitted through its website. The organization\’s security policy requires that personally identifiable information (PII) elements are specifically encrypted at all times and as soon as feasible when received.

The front-end Amazon EC2 instances should not have access to decrypted PII. A single service within the production VPC must decrypt the PII by leveraging an IAM role.

Which combination of services will support these requirements? (Choose two.)

A. Amazon Aurora in a private subnet
B. Amazon CloudFront using AWS [email protected]
C. Customer-managed MySQL with Transparent Data Encryption
D. Application Load Balancer using HTTPS listeners and targets
E. AWS Key Management Services

References: https://noise.getoto.net/tag/aws-kms/

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Latest Amazon AWS ANS-C00 practice exam questions at here:

QUESTION 1
Over which of the following Ethernet standards does AWS Direct Connect link your internal network to an AWS Direct
Connect location?
A. Copper backplane cable
B. Twisted pair cable
C. Single mode fiber-optic cable
D. Shielded balanced copper cable
Correct Answer: C
Explanation:
AWS Direct Connect links your internal network to an AWS Direct Connect location over a standard 1
gigabit or 10 gigabit Ethernet single mode fiber-optic cable.
Reference: http://docs.aws.amazon.com/directconnect/latest/UserGuide/Welcome.html


QUESTION 2
A company has two redundant AWS Direct Connect connections to a VPC. The VPC is configured using BGP metrics
so that one Direct Connect connection is used as the primary traffic path. The company wants the primary Direct
Connect connection to fail to the secondary in less than one second.
What should be done to meet this requirement?
A. Configure BGP on the company\\’s router with a keep-alive to 300 ms and the BGP hold timer to 900 ms.
B. Enable Bidirectional Forwarding Detection (BFD) on the company\\’s router with a detection minimum interval of 300
ms and a BFD liveness detection multiplier of 3.
C. Enable Dead Peer Detection (DPD) on the company\\’s router with a detection minimum interval of 300 ms and a
DPD liveliness detection multiplier of 3.
D. Enable Bidirectional Forwarding Detection (BFD) echo mode on the company\\’s router and disable sending the
Internet Control Message Protocol (ICMP) IP packet requests.
Correct Answer: B
Reference: https://aws.amazon.com/directconnect/faqs/

QUESTION 3
Your organization uses a VPN to connect to your VPC but must upgrade to a 1-G AWS Direct Connect connection for
stability and performance. Your telecommunications provider has provisioned the circuit from your data center to an
AWS Direct Connect facility and needs information on how to cross-connect (e.g., which rack/port to connect).
What is the AWS-recommended procedure for providing this information?
A. Create a support ticket. Provide your AWS account number and telecommunications company\\’s name and where
you need the Direct Connect connection to terminate.
B. Create a new connection through your AWS Management Console and wait for an email from AWS with information.
C. Ask your telecommunications provider to contact AWS through an AWS Partner Channel. Provide your AWS account
number.
D. Contact an AWS Account Manager and provide your AWS account number, telecommunications company\\’s name,
and where you need the Direct Connect connection to terminate.
Correct Answer: A


QUESTION 4
Your company just purchased a domain using another registrar and wants to use the same nameservers as your current
domain hosted with AWS. How would this be achieved?
A. Every domain must have different nameservers.
B. In the API, create a Reusable Delegation Set.
C. Import the domain to your account and it will automatically set the same nameservers.
D. In the console, create a Reusable Delegation Set.
Correct Answer: B
Explanation:
You can\\’t create a reusable delegation set in the console. AWS does not provide the same nameservers to
new domains, but a reusable delegation set can be used with as many domains as you like.


QUESTION 5
What are two routing methods used by Route 53? (Choose two.)
A. RIP
B. Failover
C. Latency
D. AS_PATH
Correct Answer: BC
Explanation:
RIP is used for network routing and AS_PATH is used for BGP path manipulation.

QUESTION 6
A company is about to migrate an application from its on-premises data center to AWS. As part of the planning process,
the following requirements involving DNS have been identified.
1.
On-premises systems must be able to resolve the entries in an Amazon Route 53 private hosted zone.
2.
Amazon EC2 instances running in the organization\\’s VPC must be able to resolve the DNS names of on-premises
systems
The organization\\’s VPC uses the CIDR block 172.16.0.0/16.
Assuming that there is no DNS namespace overlap, how can these requirements be met?
A. Change the DHCP options set for the VPC to use both the Amazon-provided DNS server and the on-premises DNS
systems. Configure the on-premises DNS systems with a stub-zone, delegating the name server 172.16.0.2 as
authoritative for the Route 53 private hosted zone.
B. Deploy and configure a set of EC2 instances into the company VPC to act as DNS proxies. Configure the proxies to
forward queries for the on-premises domain to the on-premises DNS systems, and forward all other queries to
172.16.0.2. Change the DHCP options set for the VPC to use the new DNS proxies. Configure the on-premises DNS
systems with a stub-zone, delegating the name server
172.16.0.2 as authoritative for the Route 53 private hosted zone.
C. Deploy and configure a set of EC2 instances into the company VPC to act as DNS proxies. Configure the proxies to
forward queries for the on-premises domain to the on-premises DNS systems, and forward all other queries to the
Amazon-provided DNS server (172.16.0.2). Change the DHCP options set for the VPC to use the new DNS proxies.
Configure the on-premises DNS systems with a stub-zone, delegating the proxies as authoritative for the Route 53
private hosted zone.
D. Change the DHCP options set for the VPC to use both the on-premises DNS systems. Configure the on-premises
DNS systems with a stub-zone, delegating the Route 53 private hosted zone\\’s name servers as authoritative for the
Route 53 private hosted zone.
Correct Answer: C


QUESTION 7
A company is delivering web content from an Amazon EC2 instance in a public subnet with address 2001:db8:1:100::1.
Users report they are unable to access the web content. The VPC Flow Logs for the subnet contain the following
entries:
2 012345678912 eni-0596e500123456789 2001:db8:2:200::2 2001:db8:1:100::1 0 0 58 234 24336 1551299195
1551299434 ACCEPT OK 2 012345678912 eni-0596e500123456789 2001:db8:1:100::1 2001:db8:2:200::2 0 0 58 234
24336 1551299195 1551299434 REJECT OK
Which action will restore network reachability to the EC2 instance?
A. Update the security group associated with eni-0596e500123456789to permit inbound traffic.
B. Update the security group associated with eni-0596e500123456789to permit outbound traffic.
C. Update the network ACL associated with the subnet to permit inbound traffic.
D. Update the network ACL associated with the subnet to permit outbound traffic.
Correct Answer: C


QUESTION 8
You need to find the public IP address of an instance that you\\’re logged in to. What command would you use?
A. curl ftp://169.254.169.254/latest/meta-data/public-ipv4
B. scp localhost/latest/meta-data/public-ipv4
C. curl http://127.0.0.1/latest/meta-data/public-ipv4
D. curl http://169.254.169.254/latest/meta-data/public-ipv4
Correct Answer: D
Explanation: curl http://169.254.169.254/latest/meta-data/public-ipv4

QUESTION 9
What MTU is recommended for VPN and Direct Connect links?
A. 1500
B. 2000
C. 128
D. Jumbo Frames
Correct Answer: A
Explanation:
Jumbo frames will not pass through VPN and Direct Connect links using AWS connections. You must use
an MTU of 1500.


QUESTION 10
A company\\’s application runs in a VPC and stores sensitive data in Amazon S3. The application\\’s Amazon EC2
instances are located in a private subnet with a NAT gateway deployed in a public subnet to provide access to Amazon
S3. The S3 bucket is located in the same AWS Region as the EC2 instances. The company wants to ensure that this
bucket can be accessed only from the VPC where the application resides.
Which changes should a network engineer make to the architecture to meet these requirements?
A. Delete the existing S3 bucket and create a new S3 bucket inside the VPC in the private subnet. Configure the S3
security group to allow only the application instances to access the bucket.
B. Deploy an S3 VPC endpoint in the VPC where the application resides. Configure an S3 bucket policy with a condition
to allow access only from the VPC endpoint.
C. Configure an S3 bucket policy, and use an IP address condition to restrict access to the bucket. Allow access only
from the VPC CIDR range, and deny all other IP address ranges.
D. Create a new IAM role for the EC2 instances that provides access to the S3 bucket, and assign the role to the
application instances. Configure an S3 bucket policy to allow access only from the role.
Correct Answer: B


QUESTION 11
You have a hybrid infrastructure, and you need AWS resources to be able to resolve your on-premises DNS names.
You have configured a DNS server on an EC2 instance in your 10.1.3.0/24 subnet. This subnet resides on the VPC
10.1.0.0/16. What step should you take to accomplish this?
A. Configure your DNS server to forward queries for the private hosted zone to 10.1.3.2.
B. Configure the DHCP option set in the VPC to point to the EC2 DNS server.
C. Configure your DNS server to forward queries for the private hosted zone to 10.1.0.2.
D. Disable the source/destination check flag for the DNS instance.
Correct Answer: B
Explanation:
Your DNS server will forward queries to your on-premises DNS. You must configure the DHCP option set
so the instances will forward queries to your on-premises DNS instead of the VPC DNS.


QUESTION 12
Your company uses an NTP server to synchronize time across systems. The company runs multiple versions of Linux
and Windows systems. You discover that the NTP server has failed, and you need to add an alternate NTP server to
your instances.
Where should you apply the NTP server update to propagate information without rebooting your running instances?
A. DHCP Options Set
B. instance user-data
C. cfn-init scripts
D. instance meta-data
Correct Answer: C

QUESTION 13
Your company is expanding its cloud infrastructure and moving many of its flat files and static assets to S3. You
currently use a VPN to access your compute infrastructure, but you require more reliability for your static files as you are
offloading all of your important data to AWS. What is your best course of action while keeping costs low?
A. Create a Direct Connect connection using a Private VIF to access both compute and S3 resources.
B. Create an S3 endpoint and create a route to the endpoint prefix list for your VPN to allow access to your S3
resources.
C. Create two Direct Connect connections. Each connected to a Private VIF to ensure maximum resiliency.
D. Create a Direct Connect connection using a Public VIF and route your VPN over the DX connection to your VPN
endpoint.
Correct Answer: D
Explanation:
An S3 endpoint cannot be used with a VPN. A Private VIF cannot access S3 resources. A Public VIF with
a VPN will ensure security for your compute resources and access to your S3 resources. Two DX
connections are very expensive and a Private VIF still won\\’t allow access to your S3 resources.

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Latest Amazon AWS ANS-C00 practice exam questions at here:

QUESTION 1
A company provisions an AWS Direct Connect connection to permit access to Amazon EC2 resources in several
Amazon VPCs and to data stored in private Amazon S3 buckets. The Network Engineer needs to configure the
company\\’s on-premises router for this Direct Connect connection.
Which of the following actions will require the LEAST amount of configuration overhead on the customer router?
A. Configure private virtual interfaces for the VPC resources and for Amazon S3.
B. Configure private virtual interfaces for the VPC resources and a public virtual interface for Amazon S3.
C. Configure a private virtual interface to a Direct Connect gateway for the VPC resources and for Amazon S3.
D. Configure a private virtual interface to a Direct Connect gateway for the VPC resources and a public virtual interface
for Amazon S3.
Correct Answer: A


QUESTION 2
You can use the ____ command of the AWS Config service CLI to see the compliance state for each AWS resource of
a specific type.
A. describe-compliance-by-resource
B. get-compliance-details-by-config-rule
C. describe-compliance-by-config-rule
D. get-compliance-details-by-resource
Correct Answer: A
You can use the AWS Config console, AWS CLI, or AWS Config API to view the compliance state of your rules and
resources. The describe-compliance-by-resource command of the AWS Config CLI to see the compliance state for each
AWS resource of a specific type. This is distinct from the describe-compliance-by-config-rule command, which gives the
compliance state of each rule in AWS Config .
Reference: http://docs.aws.amazon.com/config/latest/developerguide/evaluate-config_view-compliance.html

QUESTION 3
An organization is migrating its on-premises applications to AWS by using a lift-and-shift approach, taking advantage of
managed AWS services wherever possible. The company must be able to edit the application code during the migration
phase. One application is a traditional three-tier application, consisting of a web presentation tier, an application tier, and
a database tier. The external calling client applications need their sessions to remain sticky to both the web and
application nodes that they initially connect to.
Which load balancing solution would allow the web and application tiers to scale horizontally independent from one
another other?
A. Use an Application Load Balancer at the web tier and a Classic Load Balancer at the application tier. Set session
stickiness on both, but update the application code to create an application-controlled cookie on the Classic Load
Balancer.
B. Use an Application Load Balancer at both the web and application tiers, setting session stickiness at the target group
level for both tiers.
C. Deploy a web node and an application node as separate containers on the same host, using task linking to create a
relationship between the pair. Add an Application Load Balancer with session stickiness in front of all web node
containers.
D. Use a Network Load Balancer at the web tier, and an Application Load Balancer at the application tier. Enable
session stickiness on the Application Load Balancer, but take advantage of the native WebSockets protocols available
to the Network Load Balancer.
Correct Answer: B

QUESTION 4
A user has created a VPC with CIDR 20.0.0.0/16 with only a private subnet and VPN connection using the VPC wizard.
The user wants to connect to the instance in a private subnet over SSH. How should the user define the security rule for
SSH?
A. The user can connect to a instance in a private subnet using the NAT instance
B. The user has to create an instance in EC2 Classic with an elastic IP and configure the security group of a private
subnet to allow SSH from that elastic IP
C. Allow Inbound traffic on port 22 from the user\\’s network
D. Allow Inbound traffic on port 80 and 22 to allow the user to connect to a private subnet over the internet
Correct Answer: C
The user can create subnets as per the requirement within a VPC. If the user wants to connect VPC from his own data
centre, the user can setup a case with a VPN only subnet (private) which uses VPN access to connect with his data
centre. When the user has configured this setup with Wizard, all network connections to the instances in the subnet will
come from his data centre. The user has to configure the security group of the private subnet which allows the inbound
traffic on SSH (port 22) from the data centre\\’s network range.
Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario4.html

QUESTION 5
A company deployed its production Amazon VPC using CIDR block 33.16.0.0/16. The company has nearly depleted its
addresses and now needs to extend the VPC network.
Which CIDR blocks meet the company\\’s requirement to extend the VPC network with a secondary CIDR? (Choose
two.)
A. 33.17.0.0/16
B. 172.16.0.0/18
C. 100.70.0.0/17
D. 192.168.1.0/24
E. 10.0.0.0/8
Correct Answer: AC

QUESTION 6
A company has an application running on Amazon EC2 instances in a private subnet that connects to a third-party
service provider\\’s public HTTP endpoint through a NAT gateway. As request rates increase, new connections are
starting to fail. At the same time, the ErrorPortAllocation Amazon CloudWatch metric count for the NAT gateway is
increasing.
Which of the following actions should improve the connectivity issues? (Choose two.)
A. Allocate additional elastic IP addresses to the NAT gateway.
B. Request that the third-party service provider implement HTTP keepalive.
C. Implement TCP keepalive on the client instances.
D. Create additional NAT gateways and update the private subnet route table to introduce the new NAT gateways.
E. Create additional NAT gateways in the public subnet and split client instances into multiple private subnets, each with
a route to a different NAT gateway.
Correct Answer: CD
Reference: https://aws.amazon.com/premiumsupport/knowledge-center/vpc-resolve-port-allocation-errors/


QUESTION 7
You can use the ____ page of the AWS Config console to look up resources that AWS Config has discovered, including
deleted resources and resources that are not currently being recorded.
A. snapshot listing
B. configuration history
C. resource inventory
D. resource database
Correct Answer: C
You can use the AWS Config console, AWS CLI, and AWS Config API to look up the resources that AWS Config has
taken an inventory of, or discovered, including deleted resources and resources that AWS Config is not currently
recording. AWS Config discovers supported resource types only. You can use the AWS Config console in the AWS
Management console to look up these resources. The Resource Inventory page lets you perform this search.
Reference: http://docs.aws.amazon.com/config/latest/developerguide/looking-up-discovered-resources.html 

QUESTION 8
You can use the ____ command of the AWS Config service CLI to see the compliance state of each resource that AWS
Config evaluates for a specific rule.
A. describe-compliance-by-resource
B. describe-compliance-by-config-rule
C. get-compliance-details-by-config-rule
D. get-compliance-details-by-resource
Correct Answer: C
You can use the get-compliance-details-by-config-rule command of the AWS Config CLI to see the compliance state of
each resource that AWS Config evaluates for a specific rule. Reference:
http://docs.aws.amazon.com/config/latest/developerguide/evaluate-config_view-compliance.html


QUESTION 9
Your company has a DX connection and you just added a new VPC and Private VIF to which you have connected to
your DX link. You copied the settings from the other VPC to ensure it\\’s the same. Once you connected the new VIF,
you began seeing problems with connectivity to both VPCs.
You checked to make sure you didn\\’t use the same CIDR with each VPC, so what could be the problem?
A. You used the same VLAN ID for both connections.
B. You overloaded your DX circuit.
C. Your MPLS provider does not allow traffic to two VPCs.
D. You can only connect one VIF to a DX circuit.
Correct Answer: A
You can only have 1 instance of any VLAN ID.

QUESTION 10
Each custom AWS Config rule you create must be associated with a(n) AWS ____, which contains the logic that
evaluates whether your AWS resources comply with the rule.
A. Lambda function
B. Configuration trigger
C. EC2 instance
D. S3 bucket
Correct Answer: A
You can develop custom AWS Config rules to be evaluated by associating each of them with an AWS Lambda function,
which contains the logic that evaluates whether your AWS resources comply with the rule. You associate this function
with your rule, and the rule invokes the function either in response to configuration changes or periodically. The function
then evaluates whether your resources comply with your rule, and sends its evaluation results to AWS Config.
Reference: http://docs.aws.amazon.com/config/latest/developerguide/evaluate-config_develop-rules.html

QUESTION 11
Your company has installed an AWS Direct Connect connection in an ap-southeast-1 Direct Connect location. A public
virtual interface is configured through a router to a dedicated firewall. You advertise your company\\’s public /24 CIDR
block to AWS with AS 65500. The company maintains a separate, corporate Internet firewall to map all outbound traffic
to a single IP. This firewall maintains a BGP relationship with an upstream Internet provider that has delegated the
public IP block your company uses. When the BGP session for the public virtual interface is up, corporate network users
cannot access Amazon S3 resources in the ap-southeast-1 region.
Which step should you take to provide concurrent AWS and Internet access?
A. Configure AS-PATH prepending for the public virtual interface.
B. Advertise a host route for the corporate firewall on the public virtual interface.
C. Advertise a host route for the corporate firewall to the upstream Internet provider.
D. NAT the traffic destined for AWS from the dedicated firewall using the public virtual interface.
Correct Answer: D
When outgoing traffic is routed via the corporate firewall, its return path is via the Direct Connect public virtual interface
and therefore through the dedicated firewall. This dedicated firewall does not track the original NAT session and
subsequently drops the traffic. Answer A is incorrect because AWS will always prefer Direct Connect over Internet
routing. Answer B is incorrect because return traffic is still processed by the dedicated firewall. Answer C is incorrect
because it does not change the traffic flow.

QUESTION 12
A user is running a batch process on EBS backed EC2 instances. The batch process launches few EC2 instances to
process hadoop Map reduce jobs which can run between 50-600 minutes or sometimes for even more time. The user
wants a configuration that can terminate the instance only when the process is completed. How can the user configure
this with CloudWatch?
A. Configure a job which terminates all instances after 600 minutes
B. It is not possible to terminate instances automatically
C. Set up the CloudWatch with Auto Scaling to terminate all the instances
D. Configure the CloudWatch action to terminate the instance when the CPU utilization falls below 5%
Correct Answer: D
Amazon CloudWatch alarm watches a single metric over a time period that the user specifies and performs one or more
actions based on the value of the metric relative to a given threshold over a number of time periods. The user can setup
an action which terminates the instances when their CPU utilization is below a certain threshold for a certain period of
time. The EC2 action can either terminate or stop the instance as part of the EC2 action.
Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/UsingAlarmActions.html

QUESTION 13
A company\\’s Network Engineering team is solely responsible for deploying VPC infrastructure using AWS
CloudFormation. The company wants to give its Developers the ability to launch applications using CloudFormation
templates so that subnets can be created using available CIDR ranges.
What should be done to meet these requirements?
A. Create a CloudFormation templates with Amazon EC2 resources that rely on cfn-init and cfn-signals to inform the
stack of available CIDR ranges.
B. Create a CloudFormation template with a custom resource that analyzes traffic activity in VPC Flow Logs and reports
on available CIDR ranges.
C. Create a CloudFormation template that references the Fn::Cidr intrinsic function within a subnet resource to select an
available CIDR range.
D. Create a CloudFormation template with a custom resource that uses AWS Lambda and Amazon DynamoDB to
manage available CIDR ranges.
Correct Answer: C

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