nerdexam
F5

101 · Question #130

How do you support nonintelligent DNS resolution in an environment with GTM Systems and standard DNS servers? (Choose two.)

The correct answer is C. Your DNS servers may delegate some DNS names to the GTM Systems. D. The GTM System may have a Listener set for your DNS server's address.. Supporting nonintelligent DNS clients with GTM requires either standard DNS delegation pointing to the GTM or a GTM Listener configured on the DNS server's IP to transparently intercept queries.

Section 2: F5 Solutions and Technology

Question

How do you support nonintelligent DNS resolution in an environment with GTM Systems and standard DNS servers? (Choose two.)

Options

  • AThe GTM System must be a secondary server in all of your zones.
  • BYour GTM System must delegate some DNS names to the DNS Servers.
  • CYour DNS servers may delegate some DNS names to the GTM Systems.
  • DThe GTM System may have a Listener set for your DNS server's address.
  • EThe GTM System may have a Listener set for the GTM's loopback address.

How the community answered

(52 responses)
  • A
    2% (1)
  • B
    15% (8)
  • C
    75% (39)
  • E
    8% (4)

Why each option

Supporting nonintelligent DNS clients with GTM requires either standard DNS delegation pointing to the GTM or a GTM Listener configured on the DNS server's IP to transparently intercept queries.

AThe GTM System must be a secondary server in all of your zones.

GTM does not need to be a secondary server in all zones - only delegation or listener configuration is required for the relevant names.

BYour GTM System must delegate some DNS names to the DNS Servers.

The direction is reversed - DNS servers delegate names TO GTM systems, not the other way around.

CYour DNS servers may delegate some DNS names to the GTM Systems.Correct

Standard DNS delegation allows existing DNS servers to delegate specific zone names to GTM systems using NS records, so that queries for those names are forwarded to GTM without client-side awareness.

DThe GTM System may have a Listener set for your DNS server's address.Correct

A GTM Listener configured for the DNS server's IP address allows the GTM to intercept and respond to DNS queries transparently, acting as a proxy on behalf of nonintelligent resolvers that only know the standard DNS server address.

EThe GTM System may have a Listener set for the GTM's loopback address.

A Listener on the GTM loopback address would not be reachable by external DNS servers or clients, making it ineffective for handling nonintelligent DNS traffic.

Concept tested: F5 GTM DNS delegation and Listener configuration

Source: https://techdocs.f5.com/en-us/bigip-14-1-0/big-ip-dns-implementations/big-ip-dns-implementations.html

Topics

#DNS delegation#GTM listeners#non-intelligent DNS#DNS integration

Community Discussion

No community discussion yet for this question.

Sign up to join the discussion
Full 101 Practice