Spanning tree protocol interview question
6.
Which of the following statement is true?
A. A switch creates a single collision domain and a single broadcast domain. A router creates a single collision domain.
B. A switch creates separate collision domains but one broadcast domain. A router provides a separate broadcast domain.
C. A switch creates a single collision domain and separate broadcast domains. A router provides a separate broadcast domain as well.
D. A switch creates separate collision domains and separate broadcast domains. A router provides separate collision domains.
Answer & Explanation
Answer: Option B
Explanation:
Switches break up collision domains, and routers break up broadcast domains.
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7.
You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?
A. The routing tables on the switches will not update.
B. The MAC forward/filter table will not update on the switch.
C. Broadcast storms will occur on the switched network.
D. The switches will automatically load-balance between the two links.
Answer & Explanation
Answer: Option C
Explanation:
If spanning tree is disabled on a switch and you have redundant links to another switch, broadcast storms will occur, among other possible problems.
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8.
Layer 2 switching provides which of the following?
Hardware-based bridging (ASIC)
Wire speed
Low latency
Low cost
A. 1 and 3
B. 2 and 4
C. 1, 2 and 4
D. All of the above
Answer & Explanation
Answer: Option D
Explanation:
Switches, unlike bridges, are hardware based. Cisco says its switches are wire speed and provide low latency, and I guess they are low cost compared to their prices in the 1990s.
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9.
Your switch has a port status LED that is alternating between green and amber. What could this indicate?
A. The port is experiencing errors.
B. The port is shut down.
C. The port is in STP blocking mode.
D. Nothing; this is normal.
Answer & Explanation
Answer: Option A
Explanation:
When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.
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10.
You want to run the new 802.1w on your switches. Which of the following would enable this protocol?
A. Switch(config)# spanning-tree mode rapid-pvst
B. Switch# spanning-tree mode rapid-pvst
C. Switch(config)# spanning-tree mode 802.1w
D. Switch# spanning-tree mode 802.1w
Answer & Explanation
Answer: Option A
Explanation:
802.1w is the also called Rapid Spanning Tree Protocol. It is not enabled by default on Cisco switches, but it is a better STP to run since it has all the fixes that the Cisco extensions provide with 802.1d.