Cisco CCNA EtherChannel and Link Aggregation 3

Question 1

What is the function of the LACP system priority in EtherChannel negotiation?

Accepted Answer

It determines which switch controls which ports become active when more than 8 links are configured

Answer

The LACP system priority determines which switch is the 'master' when more than 8 links are bundled; the master chooses which 8 links are active and which are hot-standby.

Question 2

Which command configures the LACP port priority on an interface to influence which links are selected as active in a bundle?

Accepted Answer

lacp port-priority 100

Answer

'lacp port-priority' sets the priority value on an interface; lower values are preferred, making that port more likely to be selected as an active link.

Question 3

Which EtherChannel load-balancing method is most effective when multiple clients communicate with a single server through the switch?

Accepted Answer

Source and destination IP address (XOR)

Answer

Using both source and destination IP (XOR hash) distributes flows across links even when many clients share the same destination, providing better load distribution than either address alone.

Question 4

Which command displays the currently configured EtherChannel load-balancing method on a Cisco switch?

Accepted Answer

show etherchannel load-balance

Answer

'show etherchannel load-balance' displays the global load-balancing policy currently applied to all EtherChannel bundles on the switch.

Question 5

Which two PAgP modes will successfully form an EtherChannel when configured on opposite ends of a link?

Accepted Answer

Desirable – Auto

Answer

PAgP requires at least one side in 'desirable' mode; 'desirable–auto' works because desirable actively initiates and auto responds, while 'auto–auto' never initiates and 'on' uses no protocol.

Cisco CCNA Practice Test

Cisco CCNA Practice Test

Cisco CCNA EtherChannel and Link Aggregation 3