Question:
Which two command sequences must you configure on a switch to establish a Layer 3 EtherChannel with an open-standard protocol? (choose two)
- interface GigabitEthernet0/0/1
channel-group 10 mode on - interface port-channel 10
switchport
switchport mode trunk - interface port-channel 10
no switchport
ip address 172.16.0.1 255.255.255.0 - interface GigabitEthernet0/0/1
channel-group 10 mode auto - interface GigabitEthernet0/0/1
channel-group 10 mode active
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C. interface GigabitEthernet0/0/1
channel-group 10 mode auto
E. interface port-channel 10
no switchport
ip address 172.16.0.1 255.255.255.0
C: The “channel-group 10 mode auto” command configures the interface to use the Cisco proprietary Port Aggregation Protocol (PAgP) in a passive mode. The passive mode will form an EtherChannel if the other side is configured with the “desirable” mode. Since PAgP is Cisco proprietary, using it in a mixed-vendor environment may not be the best choice. However, if you are working within a Cisco-only environment, PAgP can be used to establish an EtherChannel.
E: The “no switchport” command turns off the Layer 2 functionality on the port-channel interface, making it a Layer 3 interface. Then, the “ip address 172.16.0.1 255.255.255.0” command assigns an IP address to the Layer 3 EtherChannel interface, allowing it to participate in Layer 3 routing.
Please note that answer B is focused on an open-standard protocol (LACP) that would be compatible with non-Cisco devices. If you are working strictly within a Cisco-only environment, PAgP (with C as correct) can be used as well.
***interface GigabitEthernet0/0/1 channel-group 10 mode active
**interface port-channel 10
switchport
switchport mode trunk
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***interface GigabitEthernet0/0/1 channel-group 10 mode active
**interface port-channel 10
switchport
switchport mode trunk
C. interface GigabitEthernet0/0/1
channel-group 10 mode auto
E. interface port-channel 10
no switchport
ip address 172.16.0.1 255.255.255.0
C: The “channel-group 10 mode auto” command configures the interface to use the Cisco proprietary Port Aggregation Protocol (PAgP) in a passive mode. The passive mode will form an EtherChannel if the other side is configured with the “desirable” mode. Since PAgP is Cisco proprietary, using it in a mixed-vendor environment may not be the best choice. However, if you are working within a Cisco-only environment, PAgP can be used to establish an EtherChannel.
E: The “no switchport” command turns off the Layer 2 functionality on the port-channel interface, making it a Layer 3 interface. Then, the “ip address 172.16.0.1 255.255.255.0” command assigns an IP address to the Layer 3 EtherChannel interface, allowing it to participate in Layer 3 routing.
Please note that answer B is focused on an open-standard protocol (LACP) that would be compatible with non-Cisco devices. If you are working strictly within a Cisco-only environment, PAgP (with C as correct) can be used as well.