CCNA Practice Quiz Spanning Tree Protocol

1. Why spanning tree protocols are implemented in layer 2 switching?

1. to acquire a higher data transfer rate
2. to avoid bridging loops due to redundant link.
3. for inter VLAN routing.
4. All of the above.

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2. Which of the following parameters are used by the spanning tree protocol to elect a root bridge? Choose two.

1. Bridge priority
2. Mac address
3. IOS version
4. link speed

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3. Which of the following events occur, when STP is disabled on a switched network? 

1. Broadcast storm
2. unstable mac table
3. traffic congestion
4. All of the above

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4. The classic spanning tree protocol (original STP) is specified in IEEE standardization as _____________.

1. 802.1d
2. 802.1q
3. 802.1w 
4. 802.1z

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5. Which of the following messages are shared by STP enabled switches among themselves to discover the bridging loops in the layer2 network?

1. Hello message
2. BPDU message
3. ICMP message
4. ARP request

Answer

1. blocking state
2. listening state
3. learning state
4. forwarding state
5. Requesting state

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1. The switch having the lowest bridge is elected as the root bridge.
2. There can be multiple root bridges in a single network segment.
3. The selection of root bridge occurs whenever there is a topology change in the network.
4. The bridge id is a combination of the switch priority id and the mac address.

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8. What is the default cost value of the FastEthernet port of Cisco Catalyst switch 2960?

1. 2
2. 4
3. 19
4. 100

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9. During the selection of the root bridge,  the bridge priority is identical for two switches. Which of the following will decide the final selection of root bridge between them?

1. switch with higher value of mac address
2. switch with the lower value of mac address
3. VLAN ID
4. Path cost

Answer

1. Robust
2. Rapid
3. Redundant
4. Rare

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11. RSTP is a newer version of the original STP.  It is specified by IEEE as ___________ standards.

1. 802.1d
2.  802.1q
3. 802.1r
4. 802.1w

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12. Which of the following are the valid STP port state? Choose three.

1. Forwarding
2. Listening
3. Denying
4. Blocking
5. Transferring

Answer

1. 1
2. 1024
3. 4096
4. 32768

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14. Which of the following commands will allow a switch port or trunk port to enter into the forwarding mode as quickly as possible from the blocking state?

1. spanningtree converge-fast
2. spanning-tree port-fast enable
3. spanning-tree portfast
4. spanning-tree rstp

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15. Which of the following statements are true about RSTP? 

1. RSTP helps to reduce the reconvergence time after the link failure.
2. it expands the STP port roles by adding alternate and backup roles.
3. RSTP has only three forwarding states namely discarding, learning and forwarding
4. All of the above

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16. Which of the following statements are true about root port?

1. The root port is a switch port on every other switch in the STP network to reach the root bridge.
2. The root port of the other switch must have the least-cost path to reach the root bridge
3. The root bridge will never have a root port.
4. All of the above.

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1. The designated port can never be a root port.
2. All the ports on the root bridge are the designated ports.
3. The other end of the designated port is called the non-designated port.
4. All of the above

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18. During spanning-tree _________ state, the port in a switch does not involve in frame forwarding. It discards all the received frame. It only listens to the BPDU and processes it.

1. Listening
2. Blocking
3. Learning
4. Disabled

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19. By default, after how many seconds the switch port transits from learning to forwarding state?

1. 10 seconds
2. 15 seconds
3. 20 seconds
4. 25 seconds

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20. What does LACP stand for?

1. Link Activated Control Protocol
2. Link Aggregation Control Protocol
3. Link Activated Configuration Protocol
4. Link Active Configuration Protocol

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