mediumMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 traffic | include tunnel
0 tunnel packets received 0 tunnel packets sent 0 tunnel packets dropped
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misinterpretation of zero counters as 'no issues' (option A) or as 'dropping all packets' (option C), when in fact zero counters simply indicate no activity on the tunnel.
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 tunnel is not carrying any IPv6 traffic.
The 'show ipv6 traffic | include tunnel' command filters the output to show only lines containing 'tunnel'. The counters for packets received, sent, and dropped are all zero, which indicates that no IPv6 packets have been encapsulated or decapsulated by any tunnel interface. This means the tunnel is not carrying any IPv6 traffic, making option B correct.
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 tunnel is passing traffic normally.
Why it's wrong here
Zero counters mean no tunnel-encapsulated packets have traversed the interface, so traffic cannot be described as passing normally. The temptation is that a tunnel interface exists and is up, which in a correctly configured, actively used tunnel would indeed show non-zero sent and received counts.
- ✓
The tunnel is not carrying any IPv6 traffic.
Why this is correct
Zero tunnel packets received or sent confirms no IPv6 traffic traverses the tunnel interface, directly satisfying the stem's counters. The command isolates tunnel-encapsulated IPv6 statistics, so absence of both inbound and outbound counts means the tunnel is idle, regardless of its configuration state or underlying transport reachability.
- ✗
The tunnel is dropping all packets.
Why it's wrong here
Zero drops alongside zero sent and received indicates no tunnel traffic arrived to be dropped, not that all packets were discarded. The counter would be non-zero if encapsulation succeeded but the tunnel path failed, which is the scenario where this reading would be valid.
- ✗
The tunnel is using IPsec encryption.
Why it's wrong here
The command counts tunnel-encapsulated packets only; it reports nothing about IPsec, which would be verified with show crypto ipsec sa or similar. The temptation is that IPsec is a common tunnel protection method, so encryption is assumed whenever a tunnel is mentioned.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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