ETHERCHANNEL INTERVIEW QUESTIONS & ANSWERS

ETHERCHANNEL INTERVIEW QUESTIONS & Answers

Q. What is ETHERCHANNEL?

Ans -

Etherchannel is an aggregation or bundling of multiple physical link into single virtual link.

Q. Benefits of ETHERCHANNEL?

Ans-

it provides

more Bandwidth

by combining multiple physical link into single virtual link.

and

Redundancy.

Q. What are the parameters to be same to configure Etherchannel?

Ans – Interfaces must configure with                           Same

Duplex

.

                   Same

Speed

.

Same

VLAN

.

Trunk

or

Access

Mode must be same.

Q. How many interfaces can aggregate or bundle using Etherchannel?

Ans- We can aggregate up to 16 interfaces. 8 will be Active and 8 Will be standby.

Q. Etherchannel is Layer 2 or Layer 3?

Ans- Etherchannel is Layer 2 & 3.

Q. Number of types to configure Etherchannel?

Manual (Static Etherchannel)

PAgP (Port Aggregation Control Protocol)

LACP (Link Aggregation Control Protocol)

Q. Difference between PAgP and LACP?

Ans - PAgP (Port Aggregation Control Protocol) ---- Cisco Proprietary.

LACP (Link Aggregation Control Protocol) ---- Open Standard.

Q. Can we configure Etherchannel between different devices?

Ans – Yes. Between Switch-

à

Server & Switch

à

Router.

Q. Modes used in PAgP and LACP to form Etherchannel?

Ans -

LACP ---- Active & Passive

PAGP ---- Auto & Desirable.

Q. Configuration of Etherchannel?

Ans-

# int range fa0/1-2

# channel-group 1 mode <on/auto/desirable/Active/Passive>

Q. How Etherchannel Load Balance the traffic?

Ans – Etherchannel use Load Balancing algorithm to send traffic. based on one of the several criteria

listed below.

src ip

dst ip.

src-dst-ip

src-mac

dst-mac

src-port

dst-port