Day 24 - EtherChannel Flashcards by Houston Molinar

Q

This allows you to bundle multiple physical interfaces into one logical channel to increase the bandwidth on point-to-point links

A

EtherChannel

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Q

How many equal speed links can you configure EtherChannel for between two switches?

A

8

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Q

STP sees the bundle of physical EtherChannel’d links as what?

A

Single interface

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Q

As a result of EtherChannel, if one of the links goes down in the port channel, what doesn’t have to occur in regards to STP?

A

Convergence

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Q

When EtherChannel is configured, the resulting virtual interface is called a what?

A

Port channel

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Q

What are some of the benefits of EtherChannel?

A

Configuration can be done on EC interface instead of individual links

Increases bandwidth

Load balancing

STP recognizes as one logical link

Redundancy

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Q

True or False: EtherChannel links can mix FastEthernet and GigabitEthernet interfaces

A

False

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Q

All ports must be Layer __ ports when enabling EtherChannel

A

2

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Q

What modes does PAgP use?

A

On
Desirable
Auto

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Q

Solve for definition:

This mode forces the interface to channel without PAgP

A

On

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Q

Solve for definition:

The interface initiates negotiations with other interfaces by sending PAgP packets

A

Desirable

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Q

Solve for definition:

The interface responds to the PAgP packets that it receives but does not initiate PAgP negotiation

A

Auto

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Q

With PAgP mode settings, will the below mode(s) allow a channel to be established?

On / On

A

Yes

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Q

With PAgP mode settings, will the below mode(s) allow a channel to be established?

Auto/Desirable / Desirable

A

Yes

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Q

With PAgP mode settings, will the below mode(s) allow a channel to be established?

On/Auto/Desirable / Not configured

A

No

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Q

With PAgP mode settings, will the below mode(s) allow a channel to be established?

On / Desirable

A

No

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Q

With PAgP mode settings, will the below mode(s) allow a channel to be established?

Auto / Desirable

A

Yes

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Q

Link aggregation control protocol is what IEEE standard?

A

802.3ad

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Q

Solve for definition:

This mode forces the interface to channel without LACP

A

On

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Q

Solve for definition:

The interface initiates negotiations with other interfaces by sending LACP packets

A

Active

Q

Solve for definition:

The interface responds to the LACP packets that it receives but does not initiate LACP negotiation

A

Passive

Q

With LACP mode settings, will the below mode(s) allow a channel to be established?

On / On

A

Yes

Q

With LACP mode settings, will the below mode(s) allow a channel to be established?

Active/Passive / Active

A

Yes

Q

With LACP mode settings, will the below mode(s) allow a channel to be established?

On/Active/Passive / Not configured

A

No

With LACP mode settings, will the below mode(s) allow a channel to be established? On / Active

No

With LACP mode settings, will the below mode(s) allow a channel to be established? Passive/On / Passive

No

What commands would be used to configure an EtherChannel interface between interfaces Gi0/1 and Gi0/2

int range gi0/1 - 2 channel-group 1 mode on (or active, desirable, etc) int port-channel 1 sw mode trunk sw trunk native vlan {vlan} sw trunk allowed vlan {allowed-vlans}

What command would you use to verify EtherChannel?

show etherchannel summary

When verifying EtherChannel, what does (SU) stand for?

Layer 2 and In Use

When verifying EtherChannel, what does (P) stand for?

Bundled in port channel

What command would you use to verify Etherchannel on a specific port?

show int {int} switchport

Ports with different native VLANs cannot form an ____________

EtherChannel

If the allowed range of __________ is not the same, the ports do not form an __________, even when PAgP is set to auto or desirable

VLANs EtherChannel

**True or False:** Packets from the same flow are load balanced round robin style across all the interfaces in the port channel (EtherChannel)?

False. Flows go over a single port channel interface

What is a flow in regards to EtherChannel?

A flow is a communication from a client to a server using a particular application

A single flow is __________ onto a single port channel interface

Load balanced

What do LACP and PAgP have in common?

Both sides of the link negotiate the port channel creation and maintenance

What is unique to Static EtherChannel that other two protocols don't have?

The switches do not negotiate the creation and maintenance BUT the settings on both sides still must match for the Port Channel to come up

What identical parameters must be in place to have the EtherChannel port come up?

Speed and Duplex Access or Trunk Mode Native VLAN and allowed VLANs on Trunks Same Access VLAN on access ports

What two (or even three) modes can LACP interfaces be set to?

On Active Passive

With LACP, if SW1s interface is set to Active and SW2s interface is set to Passive, will the port channel come up?

Yes

With LACP, if SW1s interface is set to Passive and SW2s interface is set to Passive, will the port channel come up?

No

With LACP, if SW1s interface is set to Active and SW2s interface is set to Active, will the port channel come up?

Yes

With PAgP, what mode(s) must both interfaces be set to for the EtherChannel to come up?

Desirable / Auto OR Desirable / Desirable

With PAgP, what mode is the most preferrable?

Desirable

What mode would Active or Passive be apart of?

LACP

What Etherchannel mode would Auto or Desirable be apart of?

PAgP

What mode would On be apart of?

Static