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Q:

Which of the following commands sets a trunk port on a 2960 switch?

A) truck on	B) truck all
C) switchport trunk on	D) switchport mode trunk

Answer & Explanation Answer: D) switchport mode trunk

Explanation:

To set a switch port to trunk mode, which allows the data of all VLAN information to pass down the link, use the switchport mode trunk command.

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Q:

A switch has been configured configured for three different VLANs : VLAN2, VLAN3 and VLAN4. A router has been added to provide communication between the VLANs. What minimum type of interface necessary on the router if only one connection is to be made between the router and the switch?

A) 10Mbps Ethernet	B) 56Kbps Serial
C) 100Mbps Ethernet	D) 1Gbps Ethernet

Answer & Explanation Answer: C) 100Mbps Ethernet

Explanation:

Although you can use either 100Mbps or 1Gbps Ethernet, the 100Mbps is necessary at a minimum and is the best answer to this question. You need to trunk the link from the switch to the router to make this connection work with inter-VLAN communication.

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Q:

You want to improve network performance by increasing the bandwidth available to hosts and limit the size of the broadcast domains. Which of the following options will achieve this goal?

A) Managed hubs	B) Bridges
C) Switches	D) Switches configured with VLANs

Answer & Explanation Answer: D) Switches configured with VLANs

Explanation:

By creating and implementing VLANs in your switched network, you can break up broadcast domains at layer2. For hosts on different VLANs to communicate, you must have a router or layer 3 switch.

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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:

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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