Virtual LANs problems
- 1. Which of the following provide inter-switch VLAN communication?
- ISL
- VTP
- 802.1Q
- 802.3Z
Options- A. 2 only
- B. 1 and 3
- C. 2 and 4
- D. 2, 3 and 4 Discuss
Correct Answer: 1 and 3
Explanation:
ISL is a Cisco-proprietary frame-tagging method. IEEE 802.1Q is the nonproprietary version of frame tagging.
- 2. Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?
Options- 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
- E. Switch(config-if)# switchport trunk encapsulation dot1q Discuss
Correct Answer: Switch(config-if)# switchport trunk encapsulation dot1q
Explanation:
If you are on a 2950 switch, then the interface command is just
switchport mode trunk, since the 2950 can only run the IEEE 802.1Q version. However, a 3550 can run both ISL and 802.1Q, so you must use the encapsulation command. The argument to choose 802.1Q for a trunking protocol is
dot1q.
- 3. You connect a host to a switch port, but the new host cannot log into the server that is plugged into the same switch. What could the problem be?
Options- A. The router is not configured for the new host.
- B. The VTP configuration on the switch is not updated for the new host.
- C. The host has an invalid MAC address.
- D. The switch port the host is connected to is not configured to the correct VLAN membership. Discuss
Correct Answer: The switch port the host is connected to is not configured to the correct VLAN membership.
Explanation:
This question is a little vague, but the best answer is that the VLAN membership for the port is not configured.
- 4. Which of the following is true regarding VLANs?
Options- 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
Correct Answer: VTP is used to send VLAN information to switches in a configured VTP domain.
Explanation:
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.
- 5. Which of the following is true regarding VTP?
Options- 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
Correct Answer: All switches are VTP servers by default.
Explanation:
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.
- 6. Which of the following are benefits of VLANs?
- They increase the size of collision domains.
- They allow logical grouping of users by function.
- They can enhance network security.
- They increase the size of broadcast domains while decreasing the number of collision domains.
- They simplify switch administration.
- They increase the number of broadcast domains while decreasing the size of the broadcast domains.
Options- A. 1 and 5
- B. 2 and 4
- C. 1, 3 and 5
- D. 2, 3 and 6 Discuss
Correct Answer: 2, 3 and 6
Explanation:
VLANs break up broadcast domains in a switched layer 2 network, which means smaller broadcast domains. They allow configuration by logical function instead of physical location and can create some security if configured correctly.
- 7. To configure the VLAN trunking protocol to communicate VLAN information between two switches, what two requirements must be met?
- Each end of the trunk link must be set to the IEEE 802.1e encapsulation.
- The VTP management domain name of both switches must be set the same.
- All ports on both the switches must be set as access ports.
- One of the two switches must be configured as a VTP server.
- A rollover cable is required to connect the two switches together.
- A router must be used to forward VTP traffic between VLANs.
Options- A. 1, 2 and 4
- B. 3, 5 and 6
- C. 2 and 4
- D. 1 and 6 Discuss
Correct Answer: 2 and 4
Explanation:
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.
- 8. Which of the following commands sets a trunk port on a 2960 switch?
Options- A. trunk on
- B. trunk all
- C. switchport trunk on
- D. switchport mode trunk Discuss
Correct Answer: switchport mode trunk
Explanation:
To set a switch port to trunk mode, which allows all VLAN information to pass down the link, use the
switchport mode trunk command.
- 9. Which of the following is an IEEE standard for frame tagging?
Options- A. ISL
- B. 802.3Z
- C. 802.1Q
- D. 802.3U Discuss
Correct Answer: 802.1Q
Explanation:
802.1Q was created to allow trunked links between disparate switches.
- 10. A switch has been configured for three different VLANs: VLAN2, VLAN3, and VLAN4. A router has been added to provide communication between the VLANs. What type of interface is necessary on the router if only one connection is to be made between the router and the switch?
Options- A. 10Mbps Ethernet
- B. 56Kbps Serial
- C. 100Mbps Ethernet
- D. 1Gbps Ethernet Discuss
Correct Answer: 100Mbps Ethernet
Explanation:
Although you can use either 100Mbps or 1Gbps Ethernet, the 100Mbps is necessary at a minimum and is the best answer to this question. You need to trunk the link from the switch to the router to make this connection work with inter-VLAN communication.
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