Question 371 of 1,840
mediumMultiple ChoiceObjective-mapped
350-401 Practice Question: Runs the following command on Router R4: R4# show…
A network engineer runs the following command on Router R4:
R4# show interfaces tunnel 0
Tunnel0 is up, line protocol is up Hardware is Tunnel Internet address is 10.0.0.4/30 MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive not set Tunnel source 192.168.1.4, destination 192.168.2.4 Tunnel protocol/transport GRE/IP Key disabled, sequencing disabled Checksumming of packets disabled Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/0 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out
Based on this output, what is true about this tunnel?
⚠ Common exam trap
Cisco often tests the misconception that a tunnel with zero packets or zero traffic is down, but the 'line protocol is up' status confirms it is operational regardless of traffic counters.
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 a GRE tunnel that is up and operational.
The output shows 'Tunnel protocol/transport GRE/IP', confirming this is a GRE tunnel. The interface status is 'up, line protocol is up', and the counters show zero errors, indicating the tunnel is fully operational. The lack of packet traffic does not indicate a failure; GRE tunnels can be up without active data flow.
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 using IPsec encryption.
Why it's wrong here
The encapsulation is GRE/IP, not IPsec.
- ✓
The tunnel is a GRE tunnel that is up and operational.
Why this is correct
The interface is up/up and protocol is GRE/IP.
- ✗
The tunnel is using MPLS over GRE.
Why it's wrong here
No MPLS is indicated; it is plain GRE.
- ✗
The tunnel is down because there are no packets.
Why it's wrong here
The tunnel is up/up; lack of traffic does not mean it is down.
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Last reviewed: Jul 4, 2026
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