mediumMultiple Choice
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
The verify source drops counters increment only when uRPF discards a packet whose source address fails the reverse-path check. Both values read zero, confirming that no IPv6 packet has been dropped by unicast RPF on this router.
- ✗
uRPF is not configured on any interface.
Why it's wrong here
Zero counters only mean no packets were dropped by uRPF; they do not reveal whether the feature is enabled. Interfaces with uRPF configured and no spoofed sources also show zero. Checking the interface configuration confirms whether uRPF is applied, which this command cannot.
- ✗
uRPF is dropping all packets.
Why it's wrong here
Dropping all packets would produce steadily increasing verify source drops, not zero. Zero counters indicate no uRPF-triggered discards occurred. The option is tempting because drops are the metric shown, but the value itself contradicts total discard behaviour.
- ✗
The router is not processing IPv6 traffic.
Why it's wrong here
The command displays IPv6 traffic statistics, so the router is processing IPv6; zero verify counters simply mean no uRPF drops. It is tempting because zero counters can suggest inactivity, yet other IPv6 counters would also be zero if traffic were absent.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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