AWS Certified Advanced Networking Specialty (ANS-C01)

The AWS Certified Advanced Networking Specialty (ANS-C01) were last updated on today.
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Topic 1 - Exam A

Question #16 Topic 1

Which two methods can be used to ensure items are distributed only to the correct parties? (Choose two.)

  • A Signed URLs
  • B Signed cookies
  • C Signed biscuits
  • D Signed SSLs
Suggested Answer: AB
NOTE: Signed cookies and signed URLs are used to ensure only intended parties can access CloudFront resources.
Question #17 Topic 1

You manage a website that uses a load balancer. You are noticing one of the servers is receiving more traffic than the other. What is probably the cause of this?

  • A An Elastic Load Balancer sends traffic based on server load. One server must be a larger instance.
  • B You have DNS latency routing set, so it is diverting traffic to a different instance.
  • C You have sticky sessions configured and there are several power users that happen to be on the other server.
  • D The server has more connections available.
Suggested Answer: C
NOTE: Sticky sessions can keep users on a particular server throughout their session. Latency routing would route to the load balancer, not the instances. Load balancers use a round-robin algorithm to balance.
Question #18 Topic 1

In the context of CloudFront RTMP Distribution, the Adobe Flash Media Server _________ file specifies which domains can access media files in a particular domain.

  • A accessdomain.JSON
  • B crossdomain.xml
  • C accessdomain.xml
  • D crossdomain.JSON
Suggested Answer: B
NOTE: In the context of CloudFront RTMP Distribution, the Adobe Flash Media Server crossdomain.xml file specifies which domains can access media files in a particular domain. Reference: http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Streaming_CrossDomain.html
Question #19 Topic 1

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
Suggested Answer: C
NOTE: 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 #20 Topic 1

A user is trying to send custom metrics to CloudWatch using the PutMetricData APIs. Which of the below mentioned points should the user needs to take care while sending the data to CloudWatch?

  • A The size of a request is limited to 128KB for HTTP GET requests and 64KB for HTTP POST requests
  • B The size of a request is limited to 40KB for HTTP GET requests and 8KB for HTTP POST requests
  • C The size of a request is limited to 16KB for HTTP GET requests and 80KB for HTTP POST requests
  • D The size of a request is limited to 8KB for HTTP GET requests and 40KB for HTTP POST requests
Suggested Answer: D
NOTE: With AWS CloudWatch, the user can publish data points for a metric that share not only the same time stamp, but also the same namespace and dimensions. CloudWatch can accept multiple data points in the same PutMetricData call with the same time stamp. The only thing that the user needs to take care of is that the size of a PutMetricData request is limited to 8KB for HTTP GET requests and 40KB for HTTP POST requests. Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html
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