ICND2 – VLAN Questions

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Question 1

[am4show have=’p2;’]Which two circumstances can cause collision domain issues on VLAN domain? (Choose two)

A. duplex mismatches on Ethernet segments in the same VLAN
B. multiple errors on switchport interfaces
C. congestion on the switch inband path
D. a failing NIC in an end device
E. an overloaded shared segment

 

Answer: A C[/am4show]

Explanation

On an Ethernet connection, a duplex mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex. Duplex mismatch can easily cause collision domain issue as the device that operates in full duplex mode turns off CSMA/CD. So it is eager to send data immediately without checking if the link is free to use -> A is correct.

An “inband path” is the path which provides path for management traffic (like CDP, VTP, PAgP…) but we are not sure why congestion on the switch inband path can cause collision domain issues. Maybe congestion on inband path prevents the JAM signal (sent when a collision occurs on the link) to be sent correctly on the link.

Question 2

[am4show have=’p2;’]Which three statements are typical characteristics of VLAN arrangements? (Choose three)

A. A new switch has no VLANs configured.
B. Connectivity between VLANs requires a Layer 3 device.
C. VLANs typically decrease the number of collision domains.
D. Each VLAN uses a separate address space.
E. A switch maintains a separate bridging table for each VLAN.
F. VLANs cannot span multiple switches.

 

Answer: B D E[/am4show]

Explanation

By default, all ports on a new switch belong to VLAN 1 (default & native VLAN). There are also some well-known VLANs (for example: VLAN 1002 for fddi-default; VLAN 1003 for token-ring…) configured by default -> A is not correct.

To communicate between two different VLANs we need to use a Layer 3 device like router or Layer 3 switch -> B is correct.

VLANs don’t affect the number of collision domains, they are the same -> C is not correct. Typically, VLANs increase the number of broadcast domains.
We must use a different network (or sub-network) for each VLAN. For example we can use 192.168.1.0/24 for VLAN 1, 192.168.2.0/24 for VLAN 2 -> D is correct.

A switch maintains a separate bridging table for each VLAN so that it can send frame to ports on the same VLAN only. For example, if a PC in VLAN 2 sends a frame then the switch look-ups its bridging table and only sends frame out of its ports which belong to VLAN 2 (it also sends this frame on trunk ports) -> E is correct.

We can use multiple switches to expand VLAN -> F is not correct.

Question 3

[am4show have=’p2;’]What is the default VLAN on an access port?

A. 0
B. 1
C. 10
D. 1024

 

Answer: B[/am4show]

Explanation

If we configure an access port as follows:

Switch(config)#interface fa0/1 Switch(config-if)#switchport mode access

Then this interface, by default, will belong to VLAN 1. Of course we can assign another VLAN to this port via the “switchport access vlan {vlan-number}” command.

Question 4

[am4show have=’p2;’]What are three valid reasons to assign ports to VLANs on a switch? (Choose three)

A. to make VTP easier to implement
B. to isolate broadcast traffic
C. to increase the size of the collision domain
D. to allow more devices to connect to the network
E. to logically group hosts according to function
F. to increase network security

 

Answer: B E F[/am4show]

Question 5

[am4show have=’p2;’]What command can you enter to assign an interface to the default VLAN?

A. Switch(config-if)# switchport access vlan 1
B. Switch(config-if)# switchport trunk native vlan 1
C. Switch(config-if)# vlan 1
D. Switch(config)# int vlan 1

 

Answer: A[/am4show]

Explanation

The “switchport access vlan 1” assigns VLAN 1 to this interface. In fact, by default all access ports belong to VLAN 1 so this command is hidden in the switch configuration.

Question 6

[am4show have=’p2;’]Which statement about switch access ports is true?

A. They drop packets with 802.1Q tags.
B. A VLAN must be assigned to an access port before it is created.
C. They can receive traffic from more than one VLAN with no voice support
D. By default, they carry traffic for VLAN 10.

 

Answer: A[/am4show]

Explanation

A VLAN does not need to be assigned to any port -> B is not correct.

An access port can only receive traffic from one VLAN -> C is not correct.

If not assigned to a specific VLAN, an access port carries traffic for VLAN 1 by default -> D is not correct.

An access port will drop packets with 802.1Q tags -> A is correct. Notice that 802.1Q tags are used to packets moving on trunk links.

Question 7

[am4show have=’p2;’]Which feature facilitates the tagging of frames on a specific VLAN?

A. Routing
B. hairpinning
C. switching
D. encapsulation

 

Answer: D[/am4show]

Question 8

[am4show have=’p2;’]Which three options are types of slow Vlan connectivity? (Choose three)

A. Slow broadcast domain connectivity.
B. Slow routing domain connectivity.
C. Slow default gateway connectivity.
D. Slow application domain connectivity.
E. Slow collision domain connectivity.
F. Slow inter Vlan connectivity.

 

Answer: A E F[/am4show]

Question 9

[am4show have=’p2;’]Which statement about VLAN configuration is true?

A. The switch must be in config-vlan mode before you configure an extended VLAN.
B. Dynamic inter-vlan routing is supported on VLAN 2 through VLAN 4064.
C. A switch in VTP transparent mode saves the VLAN database to the running configuration only.
D. The switch must be in VTP server or transparent mode before you configure a VLAN.

 

Answer: D[/am4show]