M5Q22: VLANs

Question 1

VLANs are used to partition a physical network into multiple logical networks called Virtual Local Area Networks.

A. True
B. False

Answer 1

A. True

Explanation: VLANs (Virtual Local Area Networks) allow for segmentation at OSI Layer 2, the Data Link Layer. Using VLAN technology we can have a single physical network or broadcast domain and partition it into multiple logical networks. These logical networks, called VLANs, act as completely separate individual networks.

Question 2

Only certain designated switch ports can be assigned to a VLAN.

A. True
B. False

Answer 2

B. False

Explanation: Any port on a switch can be assigned to any VLAN.

Question 3

When a port on a switch is configured to carry traffic for more than one VLAN from one switch to another switch it is called ________________.

A. A Host Port
B. A VLAN Port
C. A Trunk Port
D. An Access Port

Answer 3

C. A Trunk Port

Explanation: A Trunk carries multiple VLANs. For a switch to be able to send traffic for multiple VLANs to another switch the ports on the switches must be configured as Trunk Ports with both ports using the same type of trunk encapsulation.

Question 4

You are installing a new switch on the network and you need to configure it so that it can receive traffic from and send traffic to all VLANs on the network. You already have all the correct VLANs created on the switch. What should you configure on the uplink port that connects to the rest of the switched infrastructure?

A. A single VLAN
B. VTP
C. Port Security
D. 802.1q

Answer 4

D. 802.1q

Explanation: 802.1q is the open standard for VLAN tagging (VLAN trunk encapsulation). With two switches connected together 802.1q can be configured on the connected switch ports to enable VLAN trunking between the switches.

Question 5

You are in charge of a small network that has three internal VLANs. The three VLANs were kept separate and could never talk to each other, but recently there was a request from management to allow the hosts in two of the VLANs to communicate with each other without restriction. What do you need to set up in the network to allow traffic to be routed from one VLAN to the other?

A. Inter-VLAN Routing
B. More switches
C. Port Security
D. VTP

Answer 5

A. Inter-VLAN Routing

Explanation: In order to make traffic from one VLAN able to access another VLAN the VLANs must be routed together. When this is configured it is called Inter-VLAN routing. Inter-VLAN routing can be set up on a Layer 3 switch or it can be done by router that supports VLANs and trunking.

Question 6

You are in charge of a growing network. You now have 5 switches and are expected to add 10 more in the coming months. Currently, you manually configure each switch when there is a new VLAN to add or a VLAN to remove. What can you implement on your switches to make them share VLANs dynamically so you don’t have to touch every device when there is a VLAN change?

A. Trunking
B. 802.1x
C. 802.1q
D. VTP

Answer 6

D. VTP

Explanation: VTP (VLAN Trunking Protocol) allows for the sharing of VLANs amongst many switches. VTP works by setting up one switch as the VTP server and the other switches as VTP clients. When a VLAN is added or removed from the VTP server it will automatically be updated on the VTP client switches.