Virtual LANs - Networking MCQ Questions and answers

1

Which of the following is true regarding VLANs?

A) You must have at least two VLANs defined in every Cisco switched network. B) All VLANs are configured at the fastest switch and, by default, propagate this information to all other switches. C) You should not have more than 10 switches in the same VTP domain. D) VTP is used to send VLAN information to switches in a configured VTP domain.

Discuss

Answer & Solution

Answer: Option D

Solution:

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.

2

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?

A) STP B) VTP C) DHCP D) ISL

Discuss

Answer & Solution

Answer: Option B

Solution:

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.

3

Which of the following is true regarding VTP?

A) All switches are VTP servers by default. B) All switches are VTP transparent by default. C) VTP is on by default with a domain name of Cisco on all Cisco switches. D) All switches are VTP clients by default.

Discuss

Answer & Solution

Answer: Option A

Solution:

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.

4

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

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

Discuss

Answer & Solution

Answer: Option D

Solution:

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

5

Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

A) Switch(config)# switchport trunk encapsulation isl B) Switch(config)# switchport trunk encapsulation ietf C) Switch(config)# switchport trunk encapsulation dot1q D) Switch(config-if)# switchport trunk encapsulation isl

Discuss

Answer & Solution

Answer: Option C

Solution:

To configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames, you would use the dot1q encapsulation method. This method inserts VLAN tags into Ethernet frames according to the IEEE 802.1Q standard, allowing for the transmission of VLAN information across the network.

Options A, B, and D are incorrect because:
Option A: switchport trunk encapsulation isl configures the switch port to use the Inter-Switch Link (ISL) encapsulation method, which is a Cisco proprietary protocol and not part of the IEEE standard.
Option B: switchport trunk encapsulation ietf is not a valid command. There is no encapsulation method called "ietf" for trunk ports in Cisco switches.
Option D: switchport trunk encapsulation isl is a command used at the interface configuration level (Switch(config-if)#), but it specifies the ISL encapsulation method, which, as mentioned earlier, is not part of the IEEE standard.

Therefore, the correct command to configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames is Option C: Switch(config)# switchport trunk encapsulation dot1q.

6

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

A) By default, all VLANs are allowed on the trunk. B) No VLAN's are allowed, you must configure each VLAN by hand. C) Only configured VLAN's are allowed on the link. D) Only extended VLAN's are allowed by default.

Discuss

Answer & Solution

Answer: Option A

Solution:

By default, all VLANs are allowed on the trunk link and you must remove by hand each VLAN that you don't want traversing the trunked link.

7

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

A) 1, 2 and 6 B) 2, 3 and 4 C) 4, 5 and 6 D) 2, 4, and 5

Discuss

Answer & Solution

Answer: Option B

Solution:

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

8

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.

A) 1, 2 and 4 B) 3, 5 and 6 C) 2 and 4 D) 1 and 6

Discuss

Answer & Solution

Answer: Option C

Solution:

You must have the same VTP domain name on all switches in order to share VLAN information between the switches. At least one of the switches must be a VTP server; the other switches should be set to VTP client.

9

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

Discuss

Answer & Solution

Answer: Option D

Solution:

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.

10

Which switching technology reduces the size of a broadcast domain?

A) ISL B) 802.1Q C) VLANs D) STP

Discuss

Answer & Solution

Answer: Option C

Solution:

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

Virtual LANs - Networking MCQ Questions and answers | Technical Aptitude