200-301 Question 240
Select 3A network administrator is configuring a switch in a multi-VLAN environment. Port 1/0/1 needs to carry traffic for multiple VLANs, while Ports 1/0/2 and 1/0/3 are part of a Link Aggregation Group (LAG) to connect to another switch. Which of the following configurations are appropriate for this setup?
- A
Set Port 1/0/1 as a trunk port
- B
Set Port 1/0/1 as an access port
- C
Set Ports 1/0/2 and 1/0/3 as part of the same EtherChannel group
- D
Set Ports 1/0/2 and 1/0/3 as access ports in the same VLAN
- E
Set Port 1/0/1 to use dynamic desirable mode for trunk negotiation
Show answer and explanation
Correct answers: A, C, E
Explanation
In a multi-VLAN setup, trunk ports are used to carry traffic for multiple VLANs, while EtherChannel (LAG) is used to group multiple physical links into a single logical link for increased bandwidth and redundancy. Port 1/0/1 must be configured as a trunk to carry VLAN traffic, and Ports 1/0/2 and 1/0/3 must be part of the same EtherChannel group for the LAG. Additionally, enabling dynamic desirable mode on Port 1/0/1 helps negotiate trunking automatically using DTP.
- A. Correct.
Correct. A trunk port is required to carry traffic for multiple VLANs. Setting Port 1/0/1 as a trunk port allows it to forward traffic for all VLANs configured on the switch.
- B. Incorrect.
Incorrect. An access port can carry traffic for only a single VLAN, which would not meet the requirement of carrying traffic for multiple VLANs.
- C. Correct.
Correct. To form a Link Aggregation Group (LAG), Ports 1/0/2 and 1/0/3 must be configured as part of the same EtherChannel group. This allows the two ports to function as a single logical link.
- D. Incorrect.
Incorrect. Configuring Ports 1/0/2 and 1/0/3 as access ports in the same VLAN would not allow them to form a LAG. LAG requires the ports to be grouped into an EtherChannel.
- E. Correct.
Correct. Dynamic desirable mode for Port 1/0/1 enables trunk negotiation using the Dynamic Trunking Protocol (DTP), which is suitable for trunk port configuration.