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- Question
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
- Correct Answer
- All of the above
ExplanationSwitches, 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. - 1. 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
- 2. 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
- 3. Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2?
- The command is used to establish a static route.
- The default administrative distance is used.
- The command is used to configure the default route.
- The subnet mask for the source address is 255.255.255.0.
Options- A. 1 and 2
- B. 2 and 4
- C. 3 and 4
- D. All of the above Discuss
- 4. The Corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3. Looking at the output from the Corporate router, what will the router do with this packet?
Corp#sh ip route [output cut] R 192.168.215.0 [120/2] via 192.168.20.2, 00:00:23, Serial0/0 R 192.168.115.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0 R 192.168.30.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0 C 192.168.20.0 is directly connected, Serial0/0 C 192.168.214.0 is directly connected, FastEthernet0/0
Options- A. The packet will be discarded.
- B. The packet will be routed out the S0/0 interface.
- C. The router will broadcast looking for the destination.
- D. The packet will be routed out the Fa0/0 interface. Discuss
- 5. Which statement is true regarding classless routing protocols?
- The use of discontiguous networks is not allowed.
- The use of variable length subnet masks is permitted.
- RIPv1 is a classless routing protocol.
- IGRP supports classless routing within the same autonomous system.
- RIPv2 supports classless routing.
Options- A. 1, 3 and 5
- B. 3 and 4
- C. 2 and 5
- D. None of the above Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Spanning Tree Protocol problems
Search Results
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.
Correct Answer: show mac address-table
Explanation:
The command
show mac address-table displays the forward/filter table on the switch.
Correct Answer: 1 and 2
Explanation:
Although answer D almost seems right, it is not; the mask is the mask used on the remote network, not the source network. Since there is no number at the end of the static route, it is using the default administrative distance of 1.
Correct Answer: The packet will be discarded.
Explanation:
Since the routing table shows no route to the 192.168.22.0 network, the router will discard the packet and send an ICMP destination unreachable message out interface FastEthernet 0/0, which is the source LAN where the packet originated from.
Correct Answer: 2 and 5
Explanation:
Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontiguous networking.
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.
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.
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.
Correct Answer: 1, 3 and 5
Explanation:
Layer 2 features include address learning, forwarding and filtering of the network, and loop avoidance.
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.
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