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Show Command Output Questions

Practise ENCOR 350-401 practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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Scenario guide

How to approach show command output questions

These questions present the output of IOS show commands — show ip route, show interfaces, show ip ospf neighbor, show vlan brief — and ask you to interpret what they reveal about the network state. Reading IOS output accurately is one of the highest-value skills on the CCNA.

Quick answer

Show Command Output Questions questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

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Practice set

Practice scenarios

Question 1mediummultiple choice
Study the full EIGRP explanation →

A network engineer runs the following command on Router R1:

R1# show ip eigrp interfaces

EIGRP-IPv4 Interfaces for AS(100)

Interface                   Peers    Xmit Queue   Mean   Pacing Time   Multicast    Pending

Un/Reliable SRTT Un/Reliable Flow Timer Routes Gi0/0 1 0/0 12 0/10 50 0 Gi0/1 1 0/0 15 0/10 55 0

Based on this output, what can be concluded?

Question 2hardmultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW1:

SW1# show spanning-tree vlan 10

VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 32778 Address 0011.2233.4455 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0011.2233.4455 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- -------------------------------- Gi0/1 Desg FWD 4 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p

Based on this output, what can be concluded?

Question 3mediummultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW2:

SW2# show spanning-tree vlan 20

VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 24596 Address aabb.cc00.0200 Cost 4 Port 1 (GigabitEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32778 (priority 32768 sys-id-ext 20) Address aabb.cc00.0300 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Root FWD 4 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Altn BLK 4 128.3 P2p

Based on this output, what can be concluded?

Question 4easymultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW5:

SW5# show spanning-tree vlan 50

VLAN0050 Spanning tree enabled protocol ieee Root ID Priority 24626 Address aabb.cc00.0800 Cost 4 Port 1 (GigabitEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768 (priority 32768 sys-id-ext 50) Address aabb.cc00.0900 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Root FWD 4 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p Gi0/4 Altn BLK 4 128.4 P2p

Based on this output, how many ports are in the Forwarding state?

Question 5hardmultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW3:

SW3# show spanning-tree vlan 30

VLAN0030 Spanning tree enabled protocol ieee Root ID Priority 24606 Address aabb.cc00.0400 Cost 12 Port 2 (GigabitEthernet0/2) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32798 (priority 32768 sys-id-ext 30) Address aabb.cc00.0500 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Desg FWD 4 128.1 P2p Gi0/2 Root FWD 12 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p

Based on this output, what is the root path cost from SW3 to the root bridge for VLAN 30?

Question 6mediummultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW6:

SW6# show spanning-tree vlan 60

VLAN0060 Spanning tree enabled protocol ieee Root ID Priority 24636 Address aabb.cc00.0a00 Cost 8 Port 1 (GigabitEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768 (priority 32768 sys-id-ext 60) Address aabb.cc00.0b00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Root FWD 8 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Altn BLK 4 128.3 P2p Gi0/4 Desg FWD 4 128.4 P2p

Based on this output, what is the bridge priority of the root bridge for VLAN 60?

Question 7easymultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW4:

SW4# show spanning-tree vlan 40

VLAN0040 Spanning tree enabled protocol ieee Root ID Priority 24616 Address aabb.cc00.0600 Cost 8 Port 1 (GigabitEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768 (priority 32768 sys-id-ext 40) Address aabb.cc00.0700 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Root FWD 8 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p

Based on this output, which port is the root port?

Question 8easymultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW7:

SW7# show spanning-tree vlan 70

VLAN0070 Spanning tree enabled protocol ieee Root ID Priority 24646 Address aabb.cc00.0c00 Cost 4 Port 1 (GigabitEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768 (priority 32768 sys-id-ext 70) Address aabb.cc00.0d00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Root FWD 4 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Altn BLK 4 128.3 P2p

Based on this output, which port is the alternate port?

Question 9easymultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW8:

SW8# show spanning-tree vlan 80

VLAN0080 Spanning tree enabled protocol ieee Root ID Priority 24656 Address aabb.cc00.0e00 Cost 12 Port 1 (GigabitEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768 (priority 32768 sys-id-ext 80) Address aabb.cc00.0f00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Root FWD 12 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p Gi0/4 Altn BLK 4 128.4 P2p

Based on this output, what is the cost of the root port?

Question 10hardmultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW9:

SW9# show spanning-tree vlan 90

VLAN0090 Spanning tree enabled protocol ieee Root ID Priority 24666 Address aabb.cc00.1000 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24666 (priority 24576 sys-id-ext 90) Address aabb.cc00.1000 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface           Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- ------------------------------ Gi0/1 Desg FWD 4 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p Gi0/4 Desg FWD 4 128.4 P2p

Based on this output, what is the base priority of the root bridge?

Question 11mediummultiple choice
Open the full VLAN trunking answer →

A network engineer is configuring EtherChannel between two Cisco Catalyst switches. The ports are configured as access ports in VLAN 10. After configuring the port-channel interface and adding the physical ports, the engineer notices that the EtherChannel does not come up. The show etherchannel summary command shows the port-channel in a down state. What is the most likely cause?

Question 12mediummultiple choice
Read the full EtherChannel explanation →

A network engineer is troubleshooting an EtherChannel between two Cisco switches. The show etherchannel 1 port-channel command shows the port-channel is up, but traffic is not load-balanced evenly. The engineer notices that all traffic is using only one link. The physical ports are all configured identically. What is the most likely cause?

Question 13mediummultiple choice
Open the full VLAN trunking answer →

An engineer is troubleshooting an EtherChannel between two switches. The show etherchannel summary output shows that the port-channel is up, but only one physical link is active. The other three links are in a suspended state. The physical ports are all configured identically with the same VLAN allowed. What is the most likely cause?

Question 14hardmultiple choice
Open the full VLAN trunking answer →

A network engineer is troubleshooting an EtherChannel between two Cisco switches. The show etherchannel summary command shows the port-channel is up, but the show interfaces trunk command shows that the trunk is not passing traffic for VLAN 100. The allowed VLAN list on the port-channel interface includes VLAN 100. What is the most likely cause?

Question 15mediummultiple choice
Read the full EtherChannel explanation →

A network engineer runs the following command on Switch SW1:

SW1# show etherchannel summary

Flags: D - down P - bundled in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use N - not in use, no aggregation f - failed to allocate aggregator

M - not in use, minimum links not met u - unsuitable for bundling w - waiting to be aggregated d - default port

Number of channel-groups in use: 1 Number of aggregators: 1

Group Port-channel Protocol Ports ------+-------------+-----------+-------------------------------------------- 1 Po1(SU) LACP Gi0/0(P) Gi0/1(P) Gi0/2(s) Gi0/3(D)

Based on this output, what can be concluded?

These 350-401 practice questions are part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style 350-401 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.