DNS AND ROUTE 53 EXAM QUESTIONS

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DNS AND ROUTE 53 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

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-Guarantee passing score -20 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Your company has its primary production site in Western Europe and its DR site in the Asia Pacific. You need to configure DNS so that if your primary site becomes unavailable, you can fail DNS over to the secondary site. Which DNS routing policy would best achieve this?

Answer:

Failover-based routing would best achieve this objective.Question 2: Which DNS records are commonly used to stop email spoofing and spam?

Answer:

SPF records are used to verify authorized senders of mail from your domain.Question 3: Which protocol is used by DNS when response data size exceeds 512 bytes?

Answer:

TCP Question 4: Which type of DNS record should you use to resolve an IP address to a domain name?

Answer:

A PTR record is used to resolve an IP address to a domain name, and it is commonly referred to as "reverse DNS."

Question 5: Which port number is used to serve requests by DNS?

Answer:

Port 53 Question 6: Which type of DNS record should you use to resolve a domain name to another domain name?

Answer:

The CNAME record maps a name to another name. It should be used only when there are no other records on that name.

Question 7: Where do you register a domain name?

Answer:

Domain names are registered with a domain registrar, which then registers the name to InterNIC.Question 8: Which DNS record can be used to store human-readable information about a server, network, and other accounting data with a host?

Answer:

A TXT record is used to store arbitrary and unformatted text with a host.

Question 9: Which is a function that Amazon Route 53 does not perform?

• Domain registration
• DNS service
• Load balancing
• Health checks

Answer:

Amazon Route 53 performs three main functions: domain registration, DNS service, and health checking.

Question 10: Which protocol is primarily used by DNS to serve requests?

Answer:

UDP

Question 11: Amazon Route 53 cannot route queries to which AWS resource?

• Amazon CloudFront distribution
• Elastic Load Balancing load balancer
• Amazon EC2
• AWS OpsWorks

Answer:

• Amazon Route 53 can route queries to a variety of AWS resources such as an Amazon CloudFront

distribution, an Elastic Load Balancing load balancer, an Amazon EC2 instance, a website hosted in an Amazon S3 bucket, and an Amazon Relational Database (Amazon RDS).Question 12: You have an application that for legal reasons must be hosted in the United States when U.S. citizens access it. The application must be hosted in the European Union when citizens of the EU access it. For all other citizens of the world, the application must be hosted in Sydney. Which routing policy should you choose in order to achieve this?

Answer:

You should route your traffic based on where your end users are located. The best routing policy to achieve this is geolocation routing.Question 13: You are rolling out A and B test versions of a web application to see which version results in the most sales. You need 10 percent of your traffic to go to version A, 10 percent to go to version B, and the rest to go to your current production version. Which routing policy should you choose to achieve this?

Answer:

Weighted routing would best achieve this objective because it allows you to specify which percentage of traffic is directed to each endpoint.Question 14: What are the different hosted zones that can be created in Amazon Route 53?

Answer:

Using Amazon Route 53, you can create two types of hosted zones: public hosted zones and private hosted zones.Question 15: You host a web application across multiple AWS regions in the world, and you need to configure your DNS so that your end users will get the fastest network performance possible. Which routing policy should you apply?

Answer:

You want your users to have the fastest network access possible. To do this, you would use latency-based routing. Geolocation routing would not achieve this as well as latency-based routing, which is specifically geared toward measuring the latency and thus would direct you to the AWS region in which you would have the lowest latency.

Question 16: Which resource record set would not be allowed for the hosted zone

example.com?

• www.example.com
• www.aws.example.com

• www.example.ca
• www.beta.example.com

Answer:

• The resource record sets contained in a hosted zone must share the same suffix.

Question 17: Which DNS record should you use to configure the transmission of email to your intended mail server?

Answer:

You would use Mail eXchange (MX) records to define which inbound destination mail server should be used.Question 18: When configuring Amazon Route 53 as your DNS service for an existing domain, which is the first step that needs to be performed?

Answer:

You must first transfer the existing domain registration from another registrar to Amazon Route 53 to configure it as your DNS service.

Question 19: Which DNS record must all zones have by default?

Answer:

The start of a zone is defined by the SOA; therefore, all zones must have an SOA record by default.Question 20: Which type of record is commonly used to route traffic to an IPv6 address?

Answer:

An AAAA record is used to route traffic to an IPv6 address, whereas an A record is used to route traffic to an IPv4 address.