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Q:

Which proprietary Cisco STP extensions would put a switch port into err-disabled if a BPDU is received on this port?

Answer

BPDUGuard

Workspace

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Subject: CCNA

Q:

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: C) 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 stroms will occur, among other possible problems.

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Q:

If you want to disable STP on a port connected to a server, which command would you use?

A) disable spanning-tree	B) spanning-tree off
C) spanning-tree security	D) spanning-tree portfast

Answer & Explanation Answer: D) spanning-tree portfast

Explanation:

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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Q:

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: A) Switch (config) # Spanning-tree mode rapid-pvst

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

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Q:

What command will display the forward / filter table?

A) Show mac filter	B) show run
C) show mac address-table	D) show mac filter-table

Answer & Explanation Answer: C) show mac address-table

Explanation:

The Command show mac address-table displays the forward/filter table on the switch.

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Q:

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?

A) Discard it and send an error message back to the originating host	B) Flood the network with the frame
C) Add the source addres 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

Answer & Explanation Answer: C) Add the source addres 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.

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Q:

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: A) The port is experiencing errors

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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Q:

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?

A) Forwards the switch to the first available link	B) Drops the frame
C) Floods the network with the frame looking for the device	D) Sends back a message to the originating station asking for a name resolution

Answer & Explanation Answer: C) Floods the network with the frame looking for the device

Explanation:

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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