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EtherChannel Questions 5

November 22nd, 2018 in SWITCH 300-115 Go to comments

Question 1


Source MAC address is not correct as this is the MAC address of the router which is always fixed.

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).

Question 2

Question 3

Question 4

Note: This question is same as Q.15 above, but with different answers.

Question 5


You can use EtherChannel guard to detect an EtherChannel misconfiguration between the switch and a connected device. A misconfiguration can occur if the switch interfaces are configured in an EtherChannel, but the interfaces on the other device are not. A misconfiguration can also occur if the channel parameters are not the same at both ends of the EtherChannel.

If the switch detects a misconfiguration on the other device, EtherChannel guard places the switch interfaces in the error-disabled state, and displays an error message.

You can enable this feature by using the “spanning-tree etherchannel guard misconfig” global configuration command.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swstpopt.html

Question 6

Question 7

Question 8

Question 9

Question 10


According to the exhibit above, Switch1 has been configured with LACP while Switch2 is using Etherchanell static mode (“On”) so there is a protocol mismatch.

Another error in Switch2 is that there is only Fa0/1 joined in the port-channel group 1 but even so the port-channel between two switches can still go up if they are properly configured.

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