A BIG-IP DNS device is configured in bridge mode (GTM bridge mode) to integrate into an existing network. After the change, the DNS resolution works, but the iQuery communication between this device and other BIG-IP devices fails. What is the most likely reason for the iQuery failure?

Bridge mode blocks all management traffic, including iQuery.

Bridge mode requires a different iQuery port, which is not configured.

Bridge mode changes the packet flow so that iQuery traffic is not processed by the BIG-IP IP stack.

Bridge mode disables the DNS service, so iQuery has nothing to communicate.

What is a key operational characteristic of running GTM in bridge mode?

The GTM device performs NAT on all DNS queries

The GTM device encrypts all DNS queries

The GTM device acts as a transparent bridge for DNS traffic

The GTM device requires a dedicated management interface

An administrator disables SSH access on a BIG-IP DNS device to harden it. What is the most immediate impact on administrative operations?

iQuery communication will be encrypted

The device will automatically reboot

DNS resolution will stop working

Administrators can no longer use SSH for command-line management

How does bridge mode affect iQuery communication in a GTM environment?

iQuery traffic is passed through the bridge without modification

iQuery is encrypted by default in bridge mode

iQuery uses a different port in bridge mode

iQuery is disabled in bridge mode

F5Certified Technology Specialist, BIG-IP DNS

Domain 3Objective 8

Objective 3.08 Explain the Effects and Implications of Securing/hardening with Respect to Normal Operation, iQuery and Resolution 302 Practice Questions (Page 4)

Part of the Section 3: Operations and Troubleshooting domain, which makes up ~24% of our current practice bank.

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Questions 16–20

16application · hard
A BIG-IP DNS device is configured in bridge mode (GTM bridge mode) to integrate into an existing network. After the change, the DNS resolution works, but the iQuery communication between this device and other BIG-IP devices fails. What is the most likely reason for the iQuery failure?
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17application · medium
A company has just deployed a BIG-IP DNS system in a DMZ. The security team has applied port lockdown to the self IP addresses used for DNS services, allowing only UDP 53 and TCP 53. Shortly after, the DNS sync-failover group between two BIG-IP devices stops synchronizing. Which additional port must be allowed on the self IPs to restore sync-failover communication?
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18foundation · easy
What is a key operational characteristic of running GTM in bridge mode?
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19foundation · easy
An administrator disables SSH access on a BIG-IP DNS device to harden it. What is the most immediate impact on administrative operations?
Select an answer first
20foundation · easy
How does bridge mode affect iQuery communication in a GTM environment?
Select an answer first

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