Day 24 - EtherChannel

Question 1

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

Answer 1

EtherChannel

Question 2

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

Answer 2

8

Question 3

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

Answer 3

Single interface

Question 4

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?

Answer 4

Convergence

Question 5

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

Answer 5

Port channel

Question 6

What are some of the benefits of EtherChannel?

Answer 6

Configuration can be done on EC interface instead of individual links

Increases bandwidth

Load balancing

STP recognizes as one logical link

Redundancy

Question 7

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

Answer 7

False

Question 8

All ports must be Layer __ ports when enabling EtherChannel

Answer 8

2

Question 9

What modes does PAgP use?

Answer 9

On
Desirable
Auto

Question 10

Solve for definition:

This mode forces the interface to channel without PAgP

Answer 10

On

Question 11

Solve for definition:

The interface initiates negotiations with other interfaces by sending PAgP packets

Answer 11

Desirable

Question 12

Solve for definition:

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

Answer 12

Auto

Question 13

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

On / On

Answer 13

Yes

Question 14

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

Auto/Desirable / Desirable

Answer 14

Yes

Question 15

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

On/Auto/Desirable / Not configured

Answer 15

No

Question 16

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

On / Desirable

Answer 16

No

Question 17

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

Auto / Desirable

Answer 17

Yes

Question 18

Link aggregation control protocol is what IEEE standard?

Answer 18

802.3ad

Question 19

Solve for definition:

This mode forces the interface to channel without LACP

Answer 19

On

Question 20

Solve for definition:

The interface initiates negotiations with other interfaces by sending LACP packets

Answer 20

Active

Question 21

Solve for definition:

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

Answer 21

Passive

Question 22

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

On / On

Answer 22

Yes

Question 23

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

Active/Passive / Active

Answer 23

Yes

Question 24

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

On/Active/Passive / Not configured

Answer 24

No

Question 25

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

On / Active

Answer 25

No

Question 26

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

Passive/On / Passive

Answer 26

No

Question 27

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

Answer 27

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}

Question 28

What command would you use to verify EtherChannel?

Answer 28

show etherchannel summary

Question 29

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

Answer 29

Layer 2 and In Use

Question 30

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

Answer 30

Bundled in port channel

Question 31

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

Answer 31

show int {int} switchport

Question 32

Ports with different native VLANs cannot form an ____________

Answer 32

EtherChannel

Question 33

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

Answer 33

VLANs
EtherChannel

Question 34

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

Answer 34

False. Flows go over a single port channel interface

Question 35

What is a flow in regards to EtherChannel?

Answer 35

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

Question 36

A single flow is __________ onto a single port channel interface

Answer 36

Load balanced

Question 37

What do LACP and PAgP have in common?

Answer 37

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

Question 38

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

Answer 38

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

Question 39

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

Answer 39

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

Question 40

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

Answer 40

On
Active
Passive

Question 41

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

Answer 41

Yes

Question 42

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

Answer 42

No

Question 43

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

Answer 43

Yes

Question 44

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

Answer 44

Desirable / Auto
OR
Desirable / Desirable

Question 45

With PAgP, what mode is the most preferrable?

Answer 45

Desirable

Question 46

What mode would Active or Passive be apart of?

Answer 46

LACP

Question 47

What Etherchannel mode would Auto or Desirable be apart of?

Answer 47

PAgP

Question 48

What mode would On be apart of?

Answer 48

Static