Module 3 - VLANs

Question 1

What happens to a port that is associated with VLAN 10 when the administrator deletes VLAN 10 from the switch?

The port becomes inactive.

The port creates the VLAN again.

The port automatically associates itself with the native VLAN.

The port goes back to the default VLAN.

Answer 1

The port becomes inactive.

Topic 3.3.0 - If the VLAN that is associated with a port is deleted, the port becomes inactive and cannot communicate with the network any more. To verify that a port is in an inactive state, use the show interfaces switchport command.

Question 2

In which memory location are the VLAN configurations of normal range VLANs stored on a Catalyst switch?

RAM
ROM
Flash
NVRAM

Answer 2

Flash

Topic 3.3.0 - When a normal range VLAN is created the configuration information of the VLAN is stored in flash in the vlan.dat file.

Question 3

An administrator is investigating a failure on a trunk link between a Cisco switch and a switch from another vendor. After a few show commands, the administrator notices that the switches are not negotiating a trunk. What is a probable cause for this issue?

Both switches are in nonegotiate mode.

Both switches are in trunk mode.

DTP frames are flooding the entire network.

Switches from other vendors do not support DTP.

Answer 3

Switches from other vendors do not support DTP.

Topic 3.5.0 - DTP is a Cisco proprietary protocol. Non-Cisco switches do not support DTP.

Question 4

What is the purpose of the vlan.dat file on a switch?

It holds the running configuration.

It holds the operating system.

It holds the saved configuration.

It holds the VLAN database.

Answer 4

It holds the VLAN database.

Topic 3.3.0 - The VLAN database (vlan.dat) contains information about normal range VLANs such as the VLAN number, name, and VTP mode.

Question 5

What is the purpose of setting the native VLAN separate from data VLANs?

The security of management frames that are carried in the native VLAN can be enhanced.

The native VLAN is for carrying VLAN management traffic only.

The native VLAN is for routers and switches to exchange their management information, so it should be different from data VLANs.

A separate VLAN should be used to carry uncommon untagged frames to avoid bandwidth contention on data VLANs.

Answer 5

A separate VLAN should be used to carry uncommon untagged frames to avoid bandwidth contention on data VLANs.

Topic 3.1.0 - When a Cisco switch trunk port receives untagged frames (unusual in well-designed networks), it forwards these frames to the native VLAN. When the native VLAN is moved away from data VLANs, those untagged frames will not compete for bandwidth in the data VLANs. The native VLAN is not designed for carrying management traffic, but rather it is for backward compatibility with legacy LAN scenarios.

Question 6

When a Cisco switch receives untagged frames on a 802.1Q trunk port, which VLAN ID is the traffic switched to by default?

Management VLAN ID
Data VLAN ID
Unused VLAN ID
Native VLAN ID

Answer 6

Native VLAN ID

Topic 3.2.0 - A native VLAN is used to forward untagged frames that are received on a Cisco switch 802.1Q trunk port. Untagged frames that are received on a trunk port are not forwarded to any other VLAN except the native VLAN.

Question 7

A network administrator is determining the best placement of VLAN trunk links. Which two types of point-to-point connections utilize VLAN trunking? (Choose two.)

Between a switch and a client PC

Between two switches that share a common VLAN

Between a switch and a network printer

Between two switches that utilize multiple VLANs

Between a switch and a server that has an 802.1Q NIC

Answer 7

Between two switches that utilize multiple VLANs

Between a switch and a server that has an 802.1Q NIC

Topic 3.2.0 - VLAN trunk links are used to allow all VLAN traffic to propagate between devices such as the link between a switch and a server that has an 802.1Q-capable NIC.
Switches can also utilize trunk links to routers, servers, and to other switches.

Question 8

What are three primary benefits of using VLANs? (Choose three.)

Security

A reduction in the number of trunk links

Improved IT Staff efficiency

Cost reduction

End user satisfaction

Answer 8

Security

Improved IT Staff efficiency

Cost reduction

Topic 3.1.0 - Security, cost reduction, and improved IT staff efficiency are all benefits of using VLANs, along with higher performance, broadcast storm mitigation, and simpler project and application management. End users are not usually aware of VLANs, and VLANs do require configuration. Because VLANs are assigned to access ports, they do not reduce the number of trunk links.

Question 9

On a Cisco switch, where is extended range VLAN information stored?

Running configuration file
NVRAM
Startup configuration file
Flash

Answer 9

Running configuration file

Topic 3.3.0 - Extended range VLANs, 1006 through 4094, are not written to the vlan.dat file but are saved in the running configuration file.

Question 10

In which location are the normal range VLANs stored on a Cisco switch by default?

Flash memory
Startup-config
RAM
Running-config

Answer 10

Flash memory

Topic 3.1.0 - Normal range VLANs are stored in a file called vlan.dat and located in the flash memory.

Question 11

Which distinct type of VLAN is used by an administrator to access and configure a switch?

Default VLAN
Data VLAN
Management VLAN
Native VLAN

Answer 11

Management VLAN

Topic 3.1.0 - A management VLAN is used to remotely access and configure a switch.
Data VLANs are used to separate a network into groups of users or devices. The default VLAN is the initial VLAN all switch ports are placed in when loading the default configuration on a switch. The 802.1Q trunk port places untagged traffic on the native
VLAN.

Question 12

For what reason would a network administrator use the show interfaces trunk command on a switch?

To display an IP address for any existing VLAN

To examine DTP negotiation as it occurs

To verify port association with a particular VLAN

To view the native VLAN

Answer 12

To view the native VLAN

Topic 3.3.0 - The show interfaces trunk command displays the ports that are trunk ports, the trunking mode, the encapsulation type, the trunk status, the native VLAN, and the allowed VLANs on the link.

Question 13

Where is the vlan.dat file stored on a switch?

On the externally attached storage media or internal hard drive

In NVRAM

In RAM

In flash memory

Answer 13

In flash memory

Topic 3.3.0 - Normal range VLAN configurations are stored within a VLAN database file,
called vlan.dat, which is located in the flash memory of the switch.

Question 14

If an organization is changing to include Cisco IP phones in its network, what design feature must be considered to ensure voice quality?

A separate VLAN is needed for voice traffic.

Additional switch ports that are dedicated to Cisco IP phones are required.

Voice traffic and data traffic require separate trunk links between switches.

Voice traffic needs to be tagged with the native VLAN.

Answer 14

A separate VLAN is needed for voice traffic.

Topic 3.1.0 - A PC commonly connects to an IP phone and the IP phone, in turn, connects to a switch. The phone does not require a separate port. Because voice traffic cannot tolerate much packet delay, it needs to be in a separate VLAN. The voice VLAN can be configured to provide quality of service (QoS), which will ensure that the voice traffic has a higher priority than data traffic.

Question 15

A Cisco switch currently allows traffic tagged with VLANs 10 and 20 across trunk port Fa0/5.
What is the effect of issuing a switchport trunk allowed vlan 30 command on Fa0/5?

It allows VLANs 1 to 30 on Fa0/5.

It allows VLANs 10, 20, and 30 on Fa0/5.

It allows a native VLAN of 30 to be implemented on Fa0/5.

It allows only VLAN 30 on Fa0/5.