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IP Routing →hardTroubleshootingObjective-mapped

CCNA IP Routing Practice Question

This 200-301 practice question tests your understanding of ip routing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Exhibit

R1# show running-config | section interface GigabitEthernet0/0
interface GigabitEthernet0/0
 description LAN to VLAN 100
 ip address 192.168.1.1 255.255.255.0
 standby 10 ip 192.168.1.254
 standby 10 priority 100
 standby 10 preempt
!
interface GigabitEthernet0/1
 description WAN to ISP
 ip address 203.0.113.1 255.255.255.252
!

R1# show standby brief
                     P indicates configured to preempt.
                     |
Interface   Grp  Pri P State   Active          Standby         Virtual IP
Gi0/0       10   100   Active  local           192.168.1.2     192.168.1.254
Gi0/0       10   100   Active  192.168.1.2     local           192.168.1.254
(Note: Two lines for group 10 indicate both routers consider themselves Active.)

You are connected to R1 via the console. The routers R1 and R2 are directly connected using their GigabitEthernet0/0 interfaces, which are in VLAN 100 and use subnet 192.168.1.0/24. Both routers are currently showing as active for HSRP group 10. Configure HSRP on R1's GigabitEthernet0/0 to become the active router (priority 150, preempt enabled, virtual IP 192.168.1.254). Ensure that if R1's GigabitEthernet0/1 WAN interface goes down, its HSRP priority decrements by 30 so that R2 can take over. Also, correct any existing misconfiguration in the HSRP setup.

Question 1hardTroubleshooting
Open the full VLAN trunking answer →

Exhibit

R1# show running-config | section interface GigabitEthernet0/0
interface GigabitEthernet0/0
 description LAN to VLAN 100
 ip address 192.168.1.1 255.255.255.0
 standby 10 ip 192.168.1.254
 standby 10 priority 100
 standby 10 preempt
!
interface GigabitEthernet0/1
 description WAN to ISP
 ip address 203.0.113.1 255.255.255.252
!

R1# show standby brief
                     P indicates configured to preempt.
                     |
Interface   Grp  Pri P State   Active          Standby         Virtual IP
Gi0/0       10   100   Active  local           192.168.1.2     192.168.1.254
Gi0/0       10   100   Active  192.168.1.2     local           192.168.1.254
(Note: Two lines for group 10 indicate both routers consider themselves Active.)

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

✓

Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, ensure preempt is enabled on R1 (currently missing) and correct any duplicate virtual IP.

Both routers showing as active means either R2 has an equal or higher priority or preempt is missing, preventing a single active election. To fix this, on R1's GigabitEthernet0/0 interface, set standby priority 150 with preempt enabled. Add tracking of GigabitEthernet0/1 with decrement 30 so the priority drops to 120 if the WAN link fails, allowing R2 to become active. The existing misconfiguration is that preempt is either absent or disabled, causing a split-brain scenario; this solution makes R1 the active router and provides correct failover.

Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, ensure preempt is enabled on R1 (currently missing) and correct any duplicate virtual IP.

    Why this is correct

    This applies the correct settings to the routed interface, enabling preempt and priority 150, and tracking WAN with the correct decrement keyword. Identifying the missing preempt resolves the double‑active state.

    Related concept

    Access ports place end devices into a single VLAN.

  • ✗

    Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. No other changes needed because preempt is already enabled.

    Why it's wrong here

    This is incorrect because the exhibit shows that preempt is not actually enabled on R1 (the 'P' flag is missing in the show standby output). Simply configuring the commands without verifying preempt will not fix the issue.

  • ✗

    Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, change the virtual IP to 192.168.1.1 because the current one is wrong.

    Why it's wrong here

    This is incorrect because the virtual IP 192.168.1.254 is correct for the subnet 192.168.1.0/24 (typically the default gateway). Changing it to 192.168.1.1 would be incorrect and would cause connectivity issues.

  • ✗

    Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, remove the standby 10 track command from R2 to prevent conflicts.

    Why it's wrong here

    This is incorrect because the question only asks to configure R1. Removing tracking from R2 is not required and may not be under the candidate's control. The issue is on R1, not R2.

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.

✓Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, ensure preempt is enabled on R1 (currently missing) and correct any duplicate virtual IP.Correct answer▾

Why this is correct

This applies the correct settings to the routed interface, enabling preempt and priority 150, and tracking WAN with the correct decrement keyword. Identifying the missing preempt resolves the double‑active state.

✗Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. No other changes needed because preempt is already enabled.Wrong answer — click to see why▾

Why this is wrong here

Preempt is not already enabled—otherwise both routers would not show as active. Failing to enable preempt leaves the split‑brain condition unresolved.

Why candidates choose this

Candidates may see the 'preempt' command in the running config and assume it is effective, but they must verify with 'show standby' to confirm the flag is present.

✗Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, change the virtual IP to 192.168.1.1 because the current one is wrong.Wrong answer — click to see why▾

Why this is wrong here

The virtual IP 192.168.1.254 is correctly assigned to the HSRP group; changing it would replace the default gateway for all hosts, breaking connectivity.

Why candidates choose this

Candidates might think .1 is the default gateway and assume it should be the virtual IP, but HSRP allows any unused IP in the subnet.

✗Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, remove the standby 10 track command from R2 to prevent conflicts.Wrong answer — click to see why▾

Why this is wrong here

Removing tracking from R2 is irrelevant; the problem is R1's missing preempt and low priority, not R2's configuration. Both routers showing active is not caused by tracking on R2.

Why candidates choose this

Candidates might think that both routers having tracking causes conflicts, but tracking is independent per router and does not cause both to be active.

Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

Common exam traps

Common exam trap: an active trunk can still block the VLAN you need

A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.

Trap categories for this question

  • Command / output trap

    This is incorrect because the exhibit shows that preempt is not actually enabled on R1 (the 'P' flag is missing in the show standby output). Simply configuring the commands without verifying preempt will not fix the issue.

Detailed technical explanation

How to think about this question

VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.

KKey Concepts to Remember

  • Access ports place end devices into a single VLAN.
  • Trunk ports carry multiple VLANs between switches.
  • Allowed VLAN lists decide which VLANs can cross a trunk.
  • Native VLAN mismatch can create confusing symptoms.

TExam Day Tips

  • Use show vlan brief to verify access VLANs.
  • Use show interfaces trunk to verify trunk state and allowed VLANs.
  • Do not treat every same-VLAN issue as a routing problem.

Key takeaway

A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

Real-world example

How this comes up in practice

A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.

What to study next

Got this wrong? Here's your next step.

Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-301 questions on switching, trunking, and access-port configuration.

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FAQ

Questions learners often ask

What does this 200-301 question test?

IP Routing — This question tests IP Routing — Access ports place end devices into a single VLAN..

What is the correct answer to this question?

The correct answer is: Configure: interface GigabitEthernet0/0, standby 10 ip 192.168.1.254, standby 10 priority 150, standby 10 preempt, standby 10 track GigabitEthernet0/1 decrement 30. Also, ensure preempt is enabled on R1 (currently missing) and correct any duplicate virtual IP. — Both routers showing as active means either R2 has an equal or higher priority or preempt is missing, preventing a single active election. To fix this, on R1's GigabitEthernet0/0 interface, set standby priority 150 with preempt enabled. Add tracking of GigabitEthernet0/1 with decrement 30 so the priority drops to 120 if the WAN link fails, allowing R2 to become active. The existing misconfiguration is that preempt is either absent or disabled, causing a split-brain scenario; this solution makes R1 the active router and provides correct failover.

What should I do if I get this 200-301 question wrong?

Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-301 questions on switching, trunking, and access-port configuration.

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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Last reviewed: Jun 6, 2026

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