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SK0-003 · Question #452

Which of the following is TRUE about a caching name server? (Select TWO).

The correct answer is B. They can be authoritative D. They can be recursive. A caching name server stores DNS query results to speed up future requests, and while primarily recursive, it can also be authoritative for zones it manages.

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Question

Which of the following is TRUE about a caching name server? (Select TWO).

Options

  • AThey must have a trusted SSL certificate
  • BThey can be authoritative
  • CThey cannot be load-balanced
  • DThey can be recursive
  • EThey require DHCP

How the community answered

(63 responses)
  • A
    16% (10)
  • B
    73% (46)
  • C
    3% (2)
  • E
    8% (5)

Why each option

A caching name server stores DNS query results to speed up future requests, and while primarily recursive, it can also be authoritative for zones it manages.

AThey must have a trusted SSL certificate

Caching name servers do not inherently require an SSL certificate for their primary function of DNS resolution; SSL/TLS is typically used for securing web traffic or DNS over HTTPS/TLS, which is an enhancement, not a core requirement.

BThey can be authoritativeCorrect

While typically serving as recursive resolvers, a DNS server configured for caching can also be authoritative for specific DNS zones, meaning it holds the master records for those domains.

CThey cannot be load-balanced

DNS servers, including caching ones, can absolutely be load-balanced to distribute query traffic and enhance availability and performance.

DThey can be recursiveCorrect

Caching name servers are fundamentally recursive, meaning they are designed to accept DNS queries from clients and then query other DNS servers (such as root, TLD, and authoritative servers) on behalf of the client to resolve the requested domain name.

EThey require DHCP

Caching name servers require a static IP address for reliable operation as a critical infrastructure service, not DHCP which is typically used by client devices to obtain dynamic IP addresses.

Concept tested: DNS caching server characteristics (recursion, authority)

Source: https://learn.microsoft.com/en-us/windows-server/networking/dns/dns-overview

Topics

#DNS#Caching DNS#Authoritative DNS#Recursive DNS

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