ETHERCHANNEL: INTERVIEW QUESTIONS


Is Ether channel a layer 2 or layer 3 technology?

Ans

we can make both Layer 2 & Layer 3 Ether channel, depending on scenario

 

 

Can we make Ether channel between two different models of switches, example; 3550 & 1900 ?

Ans

we can make Ether channel between two different models, depends on Learning Method used by Device

Example

Catalyst 3550 switch supports address learning by aggregate ports

Catalyst 1900 switch supports address learning by physical ports

Solution

When the link partner to the Catalyst 3550 switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command

For more details, Reference Link

https://networkproxy.wordpress.com/2014/05/22/etherchannel-concept-conditions-default-config-learning-method-load-balancing/

 

what is the default Port Priority in case of Pagp ?

Ans

Priority is 128, for all interfaces

 

 

What is the difference between Learning method & load balancing method ?

Ans

https://networkproxy.wordpress.com/2014/05/22/etherchannel-concept-conditions-default-config-learning-method-load-balancing/

What are  the conditions, when Mode On, should be used or should not be used ?

Ans

ON mode without any negotiation between the device, simply assumes everything is fine in terms of negotiation parameters.

It forcefully creates Ether channel & start sending traffic over Ether channel.

 

DISADVANTAGE

Major problem is Loop creation between devices. If ON mode is used between two switches, then there might be the case that one switch ports are bundled in Ether channel, but  other switch ports are not bundled. They will start sending data as per their current situation as they have assumed everything is fine, it may create loop

So, ON mode is not recommended between switches

 

ADVANTAGE

ON mode can be used between Switches & some other device(which is not a switch)

Example: Switch & Server, Switch & Router

 

Can we make Ether channel between route & switch, switch & server ?

Ans

Yes, we can make.

 

Can I bundle two different type of interface ex. a fastethernet with gigabitethernet?

 

What is the default Load balancing method & Negotiation protocol ?

 

Why port goes into suspended state & How to check if any port is in suspended state ?

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