Chapter 5 VLAN Trunks and Etherchannel

Question 1

What are the four roles of VTP architecture?

Answer 1

1. Server: the server switch is responsible for the creation, modification and deletion of VLANs within the VTP domain.
2. Client: the client switch receives VTP advertisements and modifies the VLANs on that VLAN. VLAN cannot be configured locally on a VTP client.
3. Transparent: VTP transparent switches receive and forward VTP advertisements but do not modify the local VLAN database. VLANs are configured only locally.
4. Off: A switch does not participate in VTP advertisements and does not forward them out of any ports either. VLANs are configured only locally.

Question 2

What are the 3 version of VTP?

Answer 2

Versions 1 & 2 : version 1 is the default. Version 1 & 2 limited propagation to VLANs numbered 1 to 1005.

Version 3 allows for the full range of VLANs 1 to 4094.

Question 3

VTP advertises updates across the trunk link using which type of address?

Answer 3

Multicast Address.

Question 4

What are the 3 main types of VTP advertisements?

Answer 4

1. Summary: this advertisement occurs every 300 seconds or when a VLAN is added, removed or changed.
2. Subset : this advertisement occurs after a VLAN configuration change occurs.
3. Client requests : this advertisement is a request by a client to receive the more detailed subset advertisement.

Question 5

Which command prevents a port from forming a trunk port ?

Answer 5

Switchport nonegotiate.

Question 6

Etherchannel is defined in which IEEE?

Answer 6

IEEE 802.3AD

Question 7

Etherchannel can be used for which layer 2 or layer 3 forwarding?

Answer 7

Access

Trunk

Routed.

Question 8

What is the primary advantage of using port channels?

Answer 8

It is a reduction in topology changes when a member link line protocol goes up or down.

Question 9

Want are the two dynamic link aggregation protocols?

Answer 9

1. Link Aggregation Control Protocol (LACP)

2. Port Aggregation Protocol (PAgP)

Question 10

What multicast MAC address does PAgP use to advertises messages?

Answer 10

0100:0CCC:CCCC

Question 11

PAgP can operate in which two modes?

Answer 11

1. Auto: in this mode PAgP interface does not initiate an Etherchannel to be established.
2. Desirable: in this PAgP mode, an interface tries to establish an Etherchannel and transmit PAgP packets out of it.

Question 12

Which multicast MAC address is used to advertise messages ?

Answer 12

0180:C200:0002

Question 13

In which two modes can LACP operate?

Answer 13

1. Passive: in this LACP mode, an interface does not initiate an Etherchannel to be established
2. Active: in this LACP mode, an interface tries to establish an Etherchannel and transmit LACP packets out of it.

Question 14

What is the maximum number of links you can configure on Etherchannel?

Answer 14

8 links.

Question 15

By default, PAgP ports operate in which mode?

Answer 15

Silent mode.

Question 16

What does silent mode allow PAgP to do?

Answer 16

It allows a port to establish an Etherchannel with a device that is not PAgP capable and rare sends packets.

Question 17

The original LACP standards sent out LACP packets every?

Answer 17

Every 30 seconds.

Question 18

A link is deemed unusual if an LACP packet is not received after how many intervals?

Answer 18

Three 30 seconds intervals.

Question 19

What is LACP Fast ?

Answer 19

LACP fast advertised packet every 1 second.

Question 20

LACP can be configured on an interface using what command?

Answer 20

LACP rate fast.