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Virtual LANs

1.

Which switching technology reduces the size of a broadcast domain?

Answer: C

Virtual LANs break up broadcast domains in layer 2 switched internetworks.

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2.

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?

Answer: D

By creating and implementing VLANs in your switched network, you can break up broadcast domains at layer 2. For hosts on different VLANs to communicate, you must have a router or layer 3 switch.

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Answer: E

If you are on a 2950 switch, then the interface command is just switchport mode trunk, since the 2950 can only run the IEEE 802.1Q version. However, a 3550 can run both ISL and 802.1Q, so you must use the encapsulation command. The argument to choose 802.1Q for a trunking protocol is dot1q.

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Answer: D

Switches do not propagate VLAN information by default; you must configure the VTP domain. VLAN Trunk Protocol (VTP) is used to propagate VLAN information across a trunked link.

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5.

Which of the following protocols are used to configure trunking on a switch?

1.VLAN Trunk Protocol

2.VLAN

3.802.1Q

4.ISL

Answer: C

Cisco has a proprietary trunking protocol called ISL. The IEEE version is 802.1Q.

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6.

Which protocol reduces administrative overhead in a switched network by allowing the configuration of a new VLAN to be distributed to all the switches in a domain?

Answer: B

Virtual Trunk Protocol (VTP) is used to pass a VLAN database to any or all switches in the switched network. The three VTP modes are server, client, and transparent.

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7.

Which of the following provide inter-switch VLAN communication?

1.ISL

2.VTP

3.802.1Q

4.802.3Z

Answer: B

ISL is a Cisco-proprietary frame-tagging method. IEEE 802.1Q is the nonproprietary version of frame tagging.

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8.

Which of the following modes are valid when a switch port is used as a VLAN trunk?

1.Blocking

2.Dynamic auto

3.Dynamic desirable

4.Nonegotiate

5.Access

6.Learning

Answer: B

The valid modes of a VLAN trunk on a switch are dynamic auto, dynamic desirable, trunk (on), and nonegotiate.

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Answer: D

This question is a little vague, but the best answer is that the VLAN membership for the port is not configured.

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10.

What VTP mode allows you to change VLAN information on the switch?

Answer: C

Only in server mode can you change VTP information on a switch.

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