Spanning Tree Protocol problems
- 1. What command will display the forward/filter table?
Options- A. show mac filter
- B. show run
- C. show mac address-table
- D. show mac filter-table Discuss
Correct Answer: show mac address-table
Explanation:
The command
show mac address-table displays the forward/filter table on the switch.
- 2. 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?
Options- 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. Discuss
Correct Answer: Broadcast storms will occur on the switched network.
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.
- 3. Layer 2 switching provides which of the following?
- Hardware-based bridging (ASIC)
- Wire speed
- Low latency
- Low cost
Options- A. 1 and 3
- B. 2 and 4
- C. 1, 2 and 4
- D. All of the above Discuss
Correct Answer: All of the above
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.
- 4. What is the result of segmenting a network with a bridge (switch)?
- It increases the number of collision domains.
- It decreases the number of collision domains.
- It increases the number of broadcast domains.
- It decreases the number of broadcast domains.
- It makes smaller collision domains.
- It makes larger collision domains.
Options- A. 1 and 5
- B. 2, 3 and 5
- C. 3, 4 and 6
- D. 1, 3 and 6 Discuss
Correct Answer: 1 and 5
Explanation:
Bridges break up collision domains, which would increase the number of collision domains in a network and also make smaller collision domains.
- 5. If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?
Options- A. Discard it and send an error message back to the originating host
- B. Flood the network with the frame
- C. Add the source address and port to the MAC address table and forward the frame out the destination port
- D. Add the destination to the MAC address table and then forward the frame Discuss
Correct Answer: Add the source address and port to the MAC address table and forward the frame out the destination port
Explanation:
Since the source MAC address is not in the MAC address table, the switch will add the source address and the port it is connected to into the MAC address table and then forward the frame to the outgoing port.
- 6. Which of the following statement is true?
Options- 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. Discuss
Correct Answer: A switch creates separate collision domains but one broadcast domain. A router provides a separate broadcast domain.
Explanation:
Switches break up collision domains, and routers break up broadcast domains.
- 7. What are the distinct functions of layer 2 switching that increase available bandwidth on the network?
- Address learning
- Routing
- Forwarding and filtering
- Creating network loops
- Loop avoidance
- IP addressing
Options- A. 1, 3 and 5
- B. 2, 4 and 6
- C. 2 and 6
- D. 3 and 5 Discuss
Correct Answer: 1, 3 and 5
Explanation:
Layer 2 features include address learning, forwarding and filtering of the network, and loop avoidance.
- 8. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?
Options- A. During high-traffic periods
- B. After broken links are reestablished
- C. When upper-layer protocols require high reliability
- D. In an improperly implemented redundant topology Discuss
Correct Answer: In an improperly implemented redundant topology
Explanation:
If the Spanning Tree Protocol is not running on your switches and you connect them together with redundant links, you will have broadcast storms and multiple frame copies.
- 9. Which of the following is a layer 2 protocol used to maintain a loop-free network?
Options- A. VTP
- B. STP
- C. RIP
- D. CDP Discuss
Correct Answer: STP
Explanation:
The Spanning Tree Protocol is used to stop switching loops in a switched network with redundant paths.
- 10. You need to allow one host to be permitted to attach dynamically to each switch interface. Which two commands must you configure on your catalyst switch to meet this policy?
- Switch(config-if)# ip access-group 10
- Switch(config-if)# switchport port-security maximum 1
- Switch(config)# access-list 10 permit ip host 1
- Switch(config-if)# switchport port-security violation shutdown
- Switch(config)# mac-address-table secure
Options- A. 1 and 3
- B. 2 and 4
- C. 2, 3 and 5
- D. 4 and 5 Discuss
Correct Answer: 2 and 4
Explanation:
The
switchport port-security is an important command, and it's super easy with the CNA; however, from the CLI, you can set the maximum number of MAC addresses allowed into the port, and then set the penalty if this maximum has been passed.
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