CCNP switch slides 11

Question 1

source

Answer 1

http://www.coursehero.com/flashcards/430737/CCNP-SWITCH-642-813-Aggregate-Links/

Question 2

What is the value range and default value of the LACP system-priority and port-priority?

Answer 2

1-65536, and the default is 32768.

Question 3

What are the two methods of negotiating bundled links in Cisco Switches?

Answer 3

PAgP (Port Aggregation Protocol, Cisco proprietary) and LACP (Link Aggregation Control Protocol, Standards based).

Question 4

What happens when two switches connected via EtherChannel and LACP have different LACP system priority values? the same values?

Answer 4

-If different, the system with the lowest value will make all decisions about the EtherChannel makeup.-If the same, the switch with the lowest MAC address will make the decisions about the EtherChannel.

Question 5

The load balancing hashing algorithm can use what factors to load balance?

Answer 5

source IP, Destination IP, a combination of source/dest IP, source/dest MAC, or TCP/UDP port numbers.

Question 6

What must happen on all ports to be bundled into the same trunk on an EtherChannel group?

Answer 6

They must be in trunking mode, have the same native VLAN, and pass the same VLANs.

Question 7

What logical operation is used by the hashing algorithm on the frame bits to decide on a link for load balancing?

Answer 7

XOR

Question 8

What are the three operating modes for PAgP?

Answer 8

-On, does not negotiate-Desirable(Active!) actively seeks to form a channel-Auto(Passive!), the default, negotiates only if far end initiates it.

Question 9

In EtherChannel frames are balanced on the links according to ________?

Answer 9

A hashing algorithm that can use; source IP, Destination IP, a combination of source/dest IP, source/dest MAC, or TCP/UDP port numbers.

Question 10

What two commands must be placed on a switch port before it can become part of a EtherChannel group?

Answer 10

(if)channel-protocol [PAgP/LACP]channel-group # mode [on/auto/desirable]

Question 11

If more than 8 ports are added to an LACP EtherChannel, what happens with the ports with high port-priority numbers?

Answer 11

Lower port-priorities are made active ports in the group, and higher ones are placed into the standby status.

Question 12

What are the 9 possible methods that can be used with the ‘#port-channel load-balance’ command?

Answer 12

scr-ip, dst-ip, src-dst-ip, src-mac, dst-mac, src-dst-mac, src-port, dst-port, src-dst-port.

Question 13

How many links can be in a single EtherChannel?

Answer 13

2-8 links of FastEther, GigEther, or 10GEther.

Question 14

What are the only modes for PAgP and LACP that with exchange negotiation packets?

Answer 14

Active/Desirable, and Passive/Auto.

Question 15

What method is the default for load balancing on Layer 2 with EtherChannel?

Answer 15

source MAC, or src-mac

Question 16

What are the three operating modes for LACP?

Answer 16

-On, does not negotiate-Active, actively seeks to form a channel-Passive, negotiates only if far end initiates it.

Question 17

When in non-trunk, all bundled ports must be on the same ______ to be in the same EtherChannel?

Answer 17

VLAN

Question 18

What are the possible commands that can be added to ‘show etherchannel’ ?

Answer 18

summary, port, port-channel, detail, load-balance.

Question 19

What is the command to change the LACP system priority value?

Answer 19

(Config)lacp system-priority #####

Question 20

How many potential links does LACP allow for in a EtherChannel?

Answer 20

It allows for 16, but only 8 are used at a time, chosen by their port priority value (lowest wins!)

Question 21

What configuration step will turn a Layer 2 EtherChannel into a Layer 3 EtherChannel?

Answer 21

Adding and IP address to the PortChannel interface.

Question 22

What method is the default for load balancing on Layer 3 with EtherChannel?

Answer 22

source and destination IP, or ‘src-dst-ip’

Question 23

On PAgP links, when should the non-silent command be added to the end of the ‘channel-group’ command?

Answer 23

When you expect another PAgP-capable switch to be on the other end. This allows for more accurate information for the Spanning Tree Protocol.

Question 24

If two ports are in the Passive/Auto mode for LACP and PAgP, will they establish a connection?

Answer 24

No! they both wait for the other side to initiate!

Question 25

All ports bundled in EtherChannel should have identical settings for what?

Answer 25

Speed, Duplex, and Spanning-Tree.

Question 26

What is the command to change the LACP port priority value?

Answer 26

(if)lacp port-priority #####

Question 27

What does PAgP do if a configuration is made on a single port in the EtherChannel?

Answer 27

It reconfigures all of the other ports to match the change.

Question 28

What does IEEE 802.3ad define?

Answer 28

LACP (Link Aggregation Control Protocol)