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Virtual LANs Questions and Answers

11.

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

Answer: C

Correct answer: Server

A VTP server can create, modify and delete VLANs and advertises the changes to the domain. A client accepts advertisements and refuses local changes outright. Transparent mode is the case worth understanding: such a switch keeps its own local VLAN database and forwards advertisements without acting on them, so changes made there stay on that switch and are never propagated.

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12.

Which of the following is true regarding VTP?

Answer: A

All Cisco switches are VTP servers by default. No other VTP information is configured on a Cisco switch by default. You must set the VTP domain name on all switches to be the same domain name or they will not share the VTP database.

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13.

Which of the following is an IEEE standard for frame tagging?

Answer: C

Correct answer: 802.1Q

802.1Q is the IEEE standard, and it tags a frame by inserting a four-byte field into the existing header, which is why the native VLAN can travel untagged. ISL is Cisco’s proprietary alternative and encapsulates the entire frame rather than tagging it. 802.3z and 802.3u are Gigabit and Fast Ethernet, unrelated to VLANs.

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14.

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

Answer: D

Correct answer: switchport mode trunk

On a 2960 the port is configured from interface configuration mode with switchport mode trunk, which forces trunking regardless of what the neighbour negotiates. The alternatives are dynamic desirable and dynamic auto, which negotiate, and access, which forces the port into a single VLAN. The older trunk on forms belong to the CatOS switches.

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15.

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

Answer: C

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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16.

To configure the VLAN trunking protocol to communicate VLAN information between two switches, what two requirements must be met?

1.Each end of the trunk link must be set to the IEEE 802.1e encapsulation.

2.The VTP management domain name of both switches must be set the same.

3.All ports on both the switches must be set as access ports.

4.One of the two switches must be configured as a VTP server.

5.A rollover cable is required to connect the two switches together.

6.A router must be used to forward VTP traffic between VLANs.

Answer: C

Correct answer: 2 and 4

Two conditions matter: the VTP domain name must match on both switches, since a switch ignores advertisements from any other domain, and at least one switch must be in server mode, because only a server can originate VLAN changes. The encapsulation need not be an IEEE one - ISL works equally - a trunk is required rather than access ports, an ordinary straight or crossover cable is used, and no router is involved in carrying VTP.

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17.

Which of the following are benefits of VLANs?

1.They increase the size of collision domains.

2.They allow logical grouping of users by function.

3.They can enhance network security.

4.They increase the size of broadcast domains while decreasing the number of collision domains.

5.They simplify switch administration.

6.They increase the number of broadcast domains while decreasing the size of the broadcast domains.

Answer: D

VLANs break up broadcast domains in a switched layer 2 network, which means smaller broadcast domains. They allow configuration by logical function instead of physical location and can create some security if configured correctly.

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18.

When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?

Answer: A

Correct answer: By default, all VLANs are allowed on the trunk.

A new trunk carries every VLAN, 1 to 4094, until it is restricted. That is convenient and also a security and stability concern, since a VLAN that need not cross a link still floods its broadcasts over it - which is why switchport trunk allowed vlan is used to prune the list to what the far end actually needs.

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