Chapter 10

Question 1

Channel-group

Answer 1

One term Cisco switches use to reference a bundle of links that are, in some respects, treated like a single link. Other similar terms include EtherChannel and PortChannel.

Question 2

EtherChannel Load Distribution

Answer 2

EtherChannel Load Distribution
The logic used by switches when forwarding messages over EtherChannels by which the switch chooses the specific physical link out which the switch will forward the frame.

Question 3

LACP

Answer 3

Link Aggregation Control Protocol is a messaging protocol defined by the IEEE 802.3ad standard that enables two neighboring devices to realize that they have multiple parallel links connecting to each other and then to decide which links can be combined into an EtherChannel.

Question 4

Layer 2 EtherChannel (L2 EtherChannel)

Answer 4

Layer 2 EtherChannel (L2 EtherChannel)
An EtherChannel that acts as a switched port (that is, not a routed port), and as such, is used by a switch’s Layer 2 forwarding logic. As a result, the Layer 2 switch lists the Layer 2 EtherChannel in switch MAC address tables, and when forwarding a frame based on one of these MAC table entries, the switch balances traffic across the various ports in the Layer 2 EtherChannel.

Question 5

PAgP

Answer 5

PAgP
Port Aggregation Protocol (PAgP) is a messaging protocol defined by Cisco that enables two neighboring devices to realize that they have multiple parallel links connecting to each other and then to decide which links can be combined into an EtherChannel.

Question 6

PortChannel

Answer 6

PortChannel
One term Cisco switches use to reference a bundle of links that are, in some respects, treated like a single link. Other similar terms include EtherChannel and Channel-group.

Question 7

PVST+

Answer 7

PVST+
An STP option in Cisco switches that creates an STP instance per VLAN. Cisco proprietary.

Question 8

Rapid PVST+

Answer 8

Rapid PVST+
An STP option in Cisco switches that creates an RSTP instance per VLAN. Cisco proprietary.

Question 9

system ID extension

Answer 9

system ID extension
The term for the formatting applied to the original 16-bit STP priority field to break it into a 4-bit priority field and a 12-bit VLAN ID field.