Cisco CCNA EtherChannel and Link Aggregation 2

Question 1

Which command on a Cisco switch assigns a physical interface to EtherChannel group 1 using LACP active mode?

Accepted Answer

channel-group 1 mode active

Answer

The 'channel-group 1 mode active' interface command assigns the port to port-channel 1 and enables LACP active negotiation.

Question 2

For an EtherChannel to form successfully, which of the following must match on all member ports?

Accepted Answer

Port speed and duplex, native VLAN, and allowed VLANs

Answer

All EtherChannel member ports must have identical speed, duplex, native VLAN, and allowed VLAN lists or the bundle will not form.

Question 3

Which command verifies the status of all EtherChannel bundles on a Cisco switch?

Accepted Answer

show etherchannel summary

Answer

'show etherchannel summary' displays the port-channel group number, protocol, ports, and bundle state (SU = Layer 2 in use) in a compact format.

Question 4

What does the flag 'D' indicate for a port in the output of 'show etherchannel summary'?

Accepted Answer

The port is down and not part of the active bundle

Answer

The 'D' flag in 'show etherchannel summary' indicates the port is down, meaning it is not contributing to the active EtherChannel bundle.

Question 5

How does Spanning Tree Protocol (STP) treat an EtherChannel bundle?

Accepted Answer

STP treats the entire EtherChannel as a single logical link

Answer

STP sees the entire EtherChannel port-channel as a single logical interface, so it does not block individual member links, allowing all bundled links to carry traffic.

Cisco CCNA Practice Test

Cisco CCNA Practice Test

Cisco CCNA EtherChannel and Link Aggregation 2