nerdexam
F5

101 · Question #60

Given that VLAN failsafe is enabled on the external VLAN and the network that the active BIG- IP's external VLAN is connected to has failed, which statement is always true about the results.

The correct answer is A. The active system will note the failure in the HA table. When VLAN failsafe detects a network failure, the one result that is always true is that the active system records the failure event in the HA table; the subsequent action depends on the configured failsafe action.

Section 3: Load Balancing and High Availability Basics

Question

Given that VLAN failsafe is enabled on the external VLAN and the network that the active BIG- IP's external VLAN is connected to has failed, which statement is always true about the results.

Options

  • AThe active system will note the failure in the HA table.
  • BThe active system will reboot and the standby system will go into active mode.
  • CThe active system will failover and the standby system will go into active mode.
  • DThe active system will restart the traffic management module to eliminate the possibility that BIG-

How the community answered

(36 responses)
  • A
    72% (26)
  • B
    3% (1)
  • C
    17% (6)
  • D
    8% (3)

Why each option

When VLAN failsafe detects a network failure, the one result that is always true is that the active system records the failure event in the HA table; the subsequent action depends on the configured failsafe action.

AThe active system will note the failure in the HA table.Correct

Regardless of which failsafe action is configured (failover, restart TMM, reboot, or none), the active BIG-IP always logs the VLAN failsafe event to the HA table when it stops detecting traffic on the monitored VLAN. This logging step is unconditional, whereas the remediation action that follows is determined by the administrator's failsafe action setting and is therefore not universally guaranteed.

BThe active system will reboot and the standby system will go into active mode.

Rebooting the active system is only one possible failsafe action and is not the default; the system will not always reboot when a VLAN failure is detected.

CThe active system will failover and the standby system will go into active mode.

Failover to the standby is only one configurable failsafe action; if the failsafe action is set to 'none' or 'restart all,' a failover will not necessarily occur.

DThe active system will restart the traffic management module to eliminate the possibility that BIG-

Restarting the Traffic Management Microkernel (TMM) is a specific configurable failsafe action and is not what always happens - the behavior depends entirely on the administrator's chosen failsafe action.

Concept tested: F5 BIG-IP VLAN failsafe detection and HA table logging

Source: https://support.f5.com/csp/article/K12728

Topics

#VLAN failsafe#HA table#failover trigger#active system

Community Discussion

No community discussion yet for this question.

Sign up to join the discussion
Full 101 Practice