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

lacp group 1 active

Answer

etherchannel 1 lacp active

Answer

port-channel 1 active

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

MAC addresses and interface descriptions

Answer

IP addresses and subnet masks

Answer

CDP timer values and hold-time settings

Question 3

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

Accepted Answer

show etherchannel summary

Answer

show interfaces trunk

Answer

show lacp neighbor

Answer

show port-channel detail

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 port is the designated root port

Answer

The port is in LACP active mode

Answer

The port is a dynamic trunk port

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 runs separately on each physical link in the bundle

Answer

STP is disabled automatically when EtherChannel is configured

Answer

STP blocks all but one physical link in the bundle

Question 6

What happens when you configure one side of a link with EtherChannel mode 'On' and the other side with mode 'Active' (LACP)?

Accepted Answer

The EtherChannel fails to form because 'On' mode does not send or respond to negotiation packets

Answer

The EtherChannel forms successfully using LACP

Answer

The EtherChannel forms using PAgP as a fallback

Answer

The switch automatically detects the mismatch and switches to passive mode

Question 7

A Layer 3 EtherChannel differs from a Layer 2 EtherChannel in that it:

Accepted Answer

Has an IP address assigned directly to the port-channel interface

Answer

Uses PAgP instead of LACP for negotiation

Answer

Supports only two physical links instead of eight

Answer

Requires VTP to be disabled before configuration