What are the distinct functions of layer 2 switching that increase available bandwidth on the network?
1.Address learning
2.Routing
3.Forwarding and filtering
4.Creating network loops
5.Loop avoidance
6.IP addressing
Answer: A
Layer 2 features include address learning, forwarding and filtering of the network, and loop avoidance.
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Which of the following is a layer 2 protocol used to maintain a loop-free network?
Answer: B
The Spanning Tree Protocol is used to stop switching loops in a switched network with redundant paths.
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In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?
Answer: D
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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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?
Answer: C
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.
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If you want to disable STP on a port connected to a server, which command would you use?
Answer: D
If you have a server or other devices connected into your switch that you're totally sure won't create a switching loop if STP is disabled, you can use something called portfast on these ports. Using it means the port won't spend the usual 50 seconds to come up while STP is converging.
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Layer 2 switching provides which of the following?
1.Hardware-based bridging (ASIC)
2.Wire speed
3.Low latency
4.Low cost
Answer: D
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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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?
Answer: C
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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Your switch has a port status LED that is alternating between green and amber. What could this indicate?
Answer: A
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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What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?
Answer: C
Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device.
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Which statement describes a spanning-tree network that has converged?
Answer: C
Convergence occurs when all ports on bridges and switches have transitioned to either the forwarding or blocking states. No data is forwarded until convergence is complete. Before data can be forwarded again, all devices must be updated.
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