hardMultiple ChoiceObjective-mapped
CISA Has configured HSRP as shown Practice Question
Exhibit
Refer to the exhibit. interface GigabitEthernet0/1 description Link to Primary Site ip address 10.1.1.1 255.255.255.252 standby 1 ip 10.1.1.2 standby 1 priority 110 standby 1 preempt ! interface GigabitEthernet0/2 description Link to DR Site ip address 10.2.2.1 255.255.255.252 standby 2 ip 10.2.2.2 standby 2 priority 100 ! router ospf 1 network 10.0.0.0 0.255.255.255 area 0 ! ip route 0.0.0.0 0.0.0.0 10.1.1.2
An organization has configured HSRP as shown. During a failover test, the primary router (G0/1) is shut down, but the DR site router does not become active. What is the MOST likely reason?
⚠ Common exam trap
A common mix-up: candidates confuse HSRP group number mismatch with missing preempt or routing issues, but The CISA exam specifically tests the fundamental requirement that HSRP group numbers must match for the protocol to establish adjacency.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The HSRP group numbers on the two interfaces do not match
HSRP requires that both routers participating in the same virtual IP address use the same group number to form a single HSRP group. If the group numbers on the two interfaces do not match, each router will form its own separate HSRP group, and neither will recognize the other as a peer. Consequently, when the primary router fails, the DR router does not assume the active role because it is not part of the same HSRP group.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The default route on the primary router points to the wrong next-hop
Why it's wrong here
The default route is not the cause of the HSRP failover failure.
- ✗
The preempt command is missing on the DR router
Why it's wrong here
Preempt causes the higher priority router to take over; the DR router has lower priority and would not preempt anyway.
- ✗
The OSPF routing protocol is not redistributing the default route
Why it's wrong here
OSPF is not related to HSRP failover; the issue is with HSRP configuration.
- ✓
The HSRP group numbers on the two interfaces do not match
Why this is correct
HSRP group 1 is on G0/1 and group 2 on G0/2; they should be the same group to provide redundancy for the same virtual IP.
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Senior Network & Security Engineer · founder of Courseiva
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