EtherChannel Questions 4

Question 1

Explanation

For this question please remember this:

The table below lists if an EtherChannel will be formed or not for LACP:

The table below lists if an EtherChannel will be formed or not for PAgP:

To form an Etherchannel both sides must use the same Etherchannel protocol (LACP or PAgP). According the two tables above we can see only “desirable” and “auto” (of PAgP) can form an Etherchannel bundle.

Note: If we want to use “on” mode, both ends must be configured in this “on” mode to create an Etherchannel bundle.

Question 2

Question 3

Explanation

The table below lists if an EtherChannel will be formed or not for PAgP:

Therefore we can see if one end is in “auto”, the other end must be in “desirable” mode to form an Etherchannel.

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Explanation

This question would be clear if we have the topology so we drew it here for your reference:

Destination MAC address is not correct as this is the MAC address of the server which is always fixed too.

Same for “source and destination MAC address”, it is not suitable either. In general we cannot use any MAC address for load balancing in this topology -> only source IP address is the best choice (as each “customer” has a different source IP address).

The “source MAC address” may be a correct answer as the traffic from R1 can go via one link while R2 can go via the other link if the hashes (using XOR algorithm) on these source MAC addresses are different.

But the option “source IP address” is the best choice here as there are many source IP addresses so the chance of load-balancing is better.