CCNA 2 v6 Chapter 6: Check Your Understanding Questions Answers

CCNA 2 v6.0 (Routing & Switching Essentials v6) Chapter 6: VLANs: Check Your Understanding Questions Answers

1. Which two statements accurately describe VLAN types? (Choose two.)

  • After the initial boot of an unconfigured switch, all ports are members of the default VLAN.
  • An 802.1Q trunk port, with a native VLAN assigned, supports both tagged and untagged traffic.
  • Voice VLANs are used to support user phone and email traffic on a network.
  • VLAN 1 is always used as the management VLAN.

Explanation: Voice VLANs do not carry email traffic and the management VLAN is not always VLAN 1.

2. Which type of VLAN is used to designate which traffic is untagged when crossing a trunk port?

  • Data
  • Default
  • Native
  • Management
  • VLAN 1

Explanation: A native VLAN is the VLAN that does not receive a VLAN tag in the IEEE 802.1Q frame header. Cisco best practices recommend the use of an unused VLAN (not a data VLAN, the default VLAN of VLAN 1, or the management VLAN) as the native VLAN whenever possible.

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

  • A reduction in the number of trunk links
  • Cost reduction
  • Improved IT staff efficiency
  • No required configuration
  • Reduced security

Explanation: Cost reduction and improved IT staff efficiency are 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. VLANs increase security by segmenting traffic.

4. Which command displays the encapsulation type, the voice VLAN ID, and the access mode VLAN for the Fa0/1 interface?

  • show interfaces Fa0/1 switchport
  • show interfaces trunk
  • show mac address-table interface Fa0/1
  • show vlan brief

Explanation: The show interfaces switchport command displays the following information for a given port: Switchport, Administrative Mode, Operational Mode, Administrative Trunking Encapsulation, Operational Trunking Encapsulation, Negotiation of Trunking, Access Mode VLAN, Trunking Native Mode VLAN, Administrative Native VLAN tagging, and Voice VLAN

5. What must the network administrator do to remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3?

  • Enter the no shutdown command in interface configuration mode to return it to the default configuration and then configure the port for VLAN 3.
  • Enter the no vlan 2 and the vlan 3 commands in global configuration mode.
  • Enter the switchport access vlan 3 command in interface configuration mode.
  • Enter the switchport trunk native vlan 3 command in interface configuration mode.

Explanation: There is no need to enter the no shutdown command or remove VLAN 2 using the no vlan 2 command. The switchport trunk command is not used on an access port.

6. A Cisco Catalyst switch has been added to support the use of multiple VLANs as part of an enterprise network. The network technician finds it necessary to clear all VLAN information from the switch to incorporate a new network design. What should the technician do to accomplish this task?

  • Delete the IP address that is assigned to the management VLAN and reboot the switch.
  • Delete the startup configuration and the vlan.dat file in the flash memory of the switch and reboot the switch.
  • Erase the running configuration and reboot the switch.
  • Erase the startup configuration and reboot the switch.

Explanation: There is no need to delete the IP address or erase the running configuration file. The startup configuration and the vlan.dat should both be deleted.

7. Which two characteristics match extended range VLANs? (Choose two.)

  • CDP can be used to learn and store these VLANs.
  • They are commonly used in small networks.
  • They are saved in the running-config file by default.
  • VLAN IDs exist between 1006 and 4094.
  • VLANs are initialized from flash memory.

Explanation: Extended range VLANs are stored in the running-configuration file by default and must be saved after being configured. Extended VLANs use the VLAN IDs from 1006 to 4094.

8. What happens to switch ports after the VLAN to which they are assigned is deleted?

  • The ports are assigned to VLAN1, the default VLAN.
  • The ports are disabled.
  • The ports are placed in trunk mode.
  • The ports stop communicating with the attached devices.

Explanation: The affected ports must be reconfigured for an active VLAN.

9. 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 a native VLAN of 30 to be implemented on Fa0/5.
  • It allows only VLAN 30 on Fa0/5.
  • It allows VLANs 1 to 30 on Fa0/5.
  • It allows VLANs 10, 20, and 30 on Fa0/5.

Explanation: The switchport trunk allowed vlan 30 command allows traffic that is tagged with VLAN 30 across the trunk port. Any VLAN that is not specified in this command will not be allowed on this trunk port.

10. What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value?

  • All VLANs will be allowed across the trunk.
  • Only VLAN 1 will be allowed across the trunk.
  • Only the native VLAN will be allowed across the trunk.
  • The switches will negotiate via VTP which VLANs to allow across the trunk.

Explanation: By default, all VLANs, including the native VLAN and untagged traffic, are allowed across a trunk link.

11. An administrator has determined that the traffic from a switch that corresponds to a VLAN is not being received on another switch over a trunk link. What could be the problem?

  • Allowed VLANs on trunks
  • Dynamic desirable mode on one of the trunk links
  • Native VLAN mismatch
  • Trunk mode mismatch

Explanation: The list of allowed VLANs on a trunk is configured by the administrator by issuing the switchport trunk allowed vlan command.

12. Which two modes does Cisco recommend when configuring a particular switch port? (Choose two.)

  • Access
  • FastEthernet
  • Gigabit Ethernet
  • IEEE 802.1Q
  • ISL
  • Trunk

Explanation: Some Cisco switches are automatically configured for auto negotiation of a trunk. A best practice for configuring a port is to manually configure the port for either access mode or trunking mode.

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