Review Questions – Domain Name Services – ANS-C01 Study Guide

Review Questions

The following questions are designed to test your understanding of this chapter’s material. For more information on how to obtain additional questions, please see this book’s introduction.

  1. Your production FTP services are running across four separate servers in two regions for resiliency and to enable support for peak load times during end of month processing. The application support team is reporting that all connections are being sent to one server and the other three have no FTP sessions. You have been tasked to find a method to evenly disperse the connection load. What would be a good solution to implement?
    1. Enable simple routing to serve IP records across all four FTP servers
    1. Use latency-based routing and configure the load to be delivered at 25 percent for each of three servers
    1. Deploy the AWS CloudFront content distribution network
    1. Enable a round-robin Route 53 policy
    1. Deploy a weighted routing Route 53 policy
  2. A critical application is being migrated to AWS, and there is a mandate from the corporate management team that a hot standby site be set up in the Asia-Pacific Mumbai region to back up the primary server fleet in Asia-Pacific Jakarta. As the cloud network specialist on the project, you are looking at DNS solutions to facilitate failover. What feature of Route 53 would meet this requirement?
    1. Monitor CloudWatch metrics for a failure and trigger an SNS and Lambda process to failover to the backup site
    1. Configure Route 53 failover routing to health check the Jakarta servers, and if they stop responding, change the DNS response to point to Mumbai
    1. Use a Route 53 public hosted zone with a multivalue response of both locations
    1. Configure an Alias record for the standby and have it take effect if the primary site’s health checks fail three consecutive times
    1. Trigger a CloudTrail event notification to page the on-call engineer to activate the standby site in Mumbai
  3. Your corporate DNS server is running BIND and connects to your Route 53 private zone over a direct connection for their data center to your VPC running is the Ireland region. Your VPC resolver is configured for resolution, but systems in the corporate data center cannot resolve to EC2 instances in your VPC. What would need to be changed to enable AWS private zone support from the corporate network?
    1. Configure the BIND server to source AWS zone records
    1. Configure the VPC for enableDnsHostnames and enableDnsSupport to be true.
    1. Configure the Route 53 firewall to allow inbound traffic from the BIND server UDP/TCP port 53
    1. Make sure the zone has Internet connectivity with a NAT instance and Internet gateway configured.
    1. Create an IAM role for the DNS resolver in the corporate network
  4.  What statements are accurate about Route 53 resource records? (Choose two.)
    1. Alias records can point to a DNS record regardless of where it is hosted.
    1. Alias records can map one domain name to another.
    1. Zone apex names can be created in CNAMEs.
    1. Alias records support changing the TTL value.
    1. Route 53 CNAME records can point to other records regardless of location.
  5. You have been tasked as the cloud network engineer to give architecture advice on a new project that includes network load balancers in the Northern Virginia region. One requirement is to point the domain apex of tipofthehat.com to the external-facing interface of the ELB configured as www.tipofthehat.com. How would you accomplish this?
    1. Configure an A record for the ELB
    1. Configure an AAAA record for the ELB
    1. Use the Route 53 Alias record
    1. Use the Route 53 CNAME record
  6. A member of the accounting staff enters www.tipofthehat.com into their web browser. The resolver does not have this record in cache and must do a lookup to find the IP address. What are two of the servers it would query to resolve this domain name?
    1. TLD
    1. Alias
    1. Root
    1. Apex
    1. Public zone server
  7. You server fleet has a mixture of EC2 instances that are used to serve content to your customers. There is a large performance difference, and the older instances can accept only a limited number of connections as compared to the newer EC2 deployments that can serve hundreds of requests. You would need to make a static network configuration change to account for the difference in server performance. What policy would help resolve this issue?
    1. Latency-based routing
    1. Simple routing
    1. Multivalue responses
    1. Weighted routing
    1. Round-robin routing
  8. A new project is starting for the development group, and they plan to add a new VPC to host EC2 instances to support their programming tools. A requirement is to use the existing Route 53 private zone for name resolution. What steps would you need to accomplish this task? (Choose two.)
    1. This is not possible; a new Route 53 private zone would need to be created in the new VPC.
    1. Set the DHCP option in the new VPC’s subnet to deliver the Route 53 Resolver address.
    1. Configure a host file on the EC2 instances for local name resolution.
    1. Associate the Route 53 private hosted zones’ VPC to the new VPC.
    1. Connect the private data centers forwarders to connect to the Route 53 Resolver.
  9. Your operations teams want to collect metrics on DNS activity in your AWS operations. What would you recommend as a base server to accomplish this request?
    1. CloudTrail
    1. Amazon Macie
    1. Control Tower
    1. CloudFront
    1. CloudWatch
  10. What is the name of the organization that tracks registered domains?
    1. IANA
    1. ICANN
    1. ARIN
    1. ENISA
  11. You are in the process of configuring Route 53 DNS services for both your Internet accessible servers and servers in an availability zone that has no NAT gateway. What two types of zones would you need to configure?
    1. Private hosted zone
    1. Single AZ zone
    1. Public hosted zone
    1. Internet zone
  12. What Route 53 feature is used to monitor your endpoints and is used to determine if they have the ability and are ready for reinstatement in DNS responses to queries?
    1. Hybrid Route 53
    1. Route 53 failover
    1. Application Recovery Controller
    1. Transfer acceleration
  13. When resolving a DNS query, each DNS server that answers the queries needs a path to every zone in that namespace. What is the name given to this process?
    1. Delegation
    1. Zone
    1. Multivalue
    1. Health checking
  14.  What AWS data warehouse offering can analyze Route 53 logging data in a data lake and SQL queries to gain insight on the data?
    1. Elastic Map Reduce
    1. Hadoop
    1. Redshift
    1. Spark
  15. Which extension of the simple routing policy returns any number up to eight responses of IP addresses for the same domain name?
    1. Latency
    1. Multivalue
    1. Round-robin
    1. Weighted
  16. What is stored in a zone that contains host-specific data and information about the zone?
    1. Resource records
    1. Alias records
    1. Resolvers
    1. Host’s file
  17. What is the term used to describe when you interconnect Route 53 with the DNS system from your corporate on-premise operations for end-to-end name resolution?
    1. Public hosted zones
    1. Hybrid Route 53
    1. Multi-account
    1. Private hosted zones
  18. Which AWS Route 53 component allows for seamless interconnection of your Route 53 and on-premise systems?
    1. CloudFront
    1. Hybrid Route 53
    1. Control Tower
    1. Resolver
  19. Which DNS resource record contains a mapping from domain name to IPv6 address?
    1. A
    1. AAAA
    1. MX
    1. CNAME
  20.  Which Route 53 routing policy uses a bias to affect the records returned from a query?
    1. Regional routing
    1. Geo-proximity
    1. Geo-zone
    1. Geolocation