Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CCNP Route Switch > Etherchannels > Flashcards

Etherchannels Flashcards

1
Q

What are etherchannels?

A

Logical bundlings of two to eight links between two switches.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How does STP view etherchannels?

A

As a single port, no matter how many links make up the etherchannel.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

In STP, how is the port cost of an etherchannel determined?

A

By the number and speed of the ports in the etherchannel. More, faster ports=lower port cost.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What action does STP take when a single port in an etherchannel goes down?

A

It increases the port cost for the etherchannel.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Does the channel group number have to match between two switches?

A

No. It’s a local value.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the three variations of etherchannel?

A

LACP, PAgP, and static.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a port channel?

A

The logical representation of an etherchannel. It’s how etherchannels are referred to within CIOS syntax.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What command is used to configure a port channel?

A

From interface config: channel-group (#) mode ( )

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is PAgP?

A

Port aggregation protocol. A Cisco proprietary etherchannel negotiation protocol.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is LACP?

A

Link aggregation control protocol. Industry standard etherchannel negotiation protocol.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is a good show command to check the overall status of etherchannels on a switch?

A

Show etherchannel brief, or Show etherchannel summary.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does LACP use port priority for?

A

To determine which 8 of the total 16 allowed ports will be actively used in the etherchannel. Lower priority ports will be used.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a good command to check etherchannel relationship status?

A

Show LACP/PAgP neighbor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How many ports can be assigned to a LACP etherchannel?

A

16, but only 8 will be used, determined by priority.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the LACP port modes?

A

Active and passive.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the PAgP port modes?

A

Auto and desirable.

17
Q

What happens if you make a change to an individual PAgP port?

A

The change will be made on all ports in the etherchannel.

18
Q

What criteria can be chosen for etherchannel load-distribution?

A

Source MAC, destination MAC, source & destination MAC, source IP, destination IP, source & destination IP, TCP/UDP source, TCP/UDP destination, TCP/UPD source & destination.

19
Q

Can load-distribution criteria be chosen on an etherchannel-by-etherchannel basis?

A

No, it can only be configured globally.

20
Q

How does etherchannel load-distribution work?

A

Values 0-7 are assigned equally among the etherchannel interfaces. Unique MAC/IPs (whatever you’re using for criteria) are mapped to these values, and in turn are assigned to an interface. This is NOT true load-balancing.

21
Q

How is etherchannel load-balancing different when using source & destination MAC/IP?

A

The XOR (exclusive-or) operation is used to map each unique combination of addresses to a port. This operation compares the last few bits of the source and destination address to determine it’s value, which is then mapped to a port.

22
Q

Describe STP etherchannel misconfig guard.

A

STP etherchannel misconfig guard protects against loops caused by statically configured etherchannels that are not configured on both switches. If a misconfiguration is detected, the switch will be placed into err-disable state.

23
Q

What command will change the etherchannel load-distribution criteria?

A

From global config, “port-channel load-balance ___”

24
Q

What command will enable STP etherchannel misconfig guard?

A

From global config, “spanning etherchannel guard misconfig”

25
Q

Which etherchannel protocol supports half duplex?

A

PAgP

26
Q

Do portchannel commands overwrite individual port commands?

A

Not always. It’s best practice to keep configurations for the port channel.

27
Q

What must all ports in a layer 2 etherchannel agree on?

A

Speed, duplex, mapped VLANs, native VLAN, trunking protocol.

28
Q

What must ports in a layer 3 etherchannel agree on?

A

No switch port, speed and duplex.

CCNP Route Switch (25 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions