mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify IPv6 uRPF…
A network engineer runs the following command to verify IPv6 uRPF drops:
R1# show ipv6 traffic | include verify
0 verify source drops, 0 verify source suppressed drops
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that zero counters mean the feature is not configured, when in fact the feature may be configured and simply not dropping any packets.
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
✓
No IPv6 packets have been dropped by uRPF checks.
The output shows '0 verify source drops' and '0 verify source suppressed drops', which are the counters for IPv6 unicast Reverse Path Forwarding (uRPF) drops. Since both counters are zero, no IPv6 packets have been dropped by uRPF checks. This does not necessarily mean uRPF is not configured; it simply indicates that no packets have failed the uRPF verification process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
No IPv6 packets have been dropped by uRPF checks.
Why this is correct
Correct. Zero drops indicate that all packets passed uRPF verification.
- ✗
uRPF is not configured on any interface.
Why it's wrong here
Incorrect. The counters exist and show zero, but uRPF could be configured and passing traffic.
- ✗
uRPF is dropping all packets.
Why it's wrong here
Incorrect. Zero drops mean no drops.
- ✗
The router is not processing IPv6 traffic.
Why it's wrong here
Incorrect. The command shows traffic statistics; zero drops does not indicate no traffic.
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Senior Network & Security Engineer · founder of Courseiva
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