200-301 Question 106
Select 3An organization has deployed a content delivery network (CDN) using an anycast addressing model for its DNS servers. Which of the following benefits are most likely achieved by using anycast in this scenario?
- A
Improved load balancing by routing clients to the nearest DNS server
- B
Elimination of the need for routing protocols in the network
- C
Reduced latency for users accessing the CDN
- D
Increased fault tolerance and server redundancy
- E
Automatic encryption of DNS queries between clients and servers
Show answer and explanation
Correct answers: A, C, D
Explanation
Anycast is a network addressing and routing method in which multiple servers share the same IP address. This allows requests to be routed to the nearest or best-performing server, improving load balancing, reducing latency, and providing fault tolerance. However, anycast does not eliminate the need for routing protocols or provide encryption by default.
- A. Correct.
Correct: Anycast directs client requests to the nearest available instance of a server, improving load balancing and optimizing resource usage.
- B. Incorrect.
Incorrect: Routing protocols are still required to manage and propagate anycast addresses across the network.
- C. Correct.
Correct: By routing users to the nearest server, anycast helps minimize latency and improve the speed of DNS query resolution.
- D. Correct.
Correct: Anycast inherently provides fault tolerance because if one server instance goes down, traffic can be rerouted to another nearby instance.
- E. Incorrect.
Incorrect: Anycast does not inherently encrypt DNS queries; encryption requires protocols like DNS over HTTPS (DoH) or DNS over TLS (DoT).