Scenario 3: EtherChannels

This scenario focuses on EtherChannel links between switches. See the diagram shown in Figure 19-3 and answer the questions that follow.

Figure 19-3. Diagram for Scenario 3

1.	Four GigabitEthernet interfaces on Catalyst A are to be bundled into a Gigabit EtherChannel with Catalyst B. If each of these interfaces also is configured as a trunk, what must be similar about them on both switches?
2.	Catalyst A should actively initiate an EtherChannel with Catalyst B. PAgP negotiation should be used. What commands should be used on each of Catalyst A's ports to configure negotiation of EtherChannel 1?
3.	What is the default load-distribution algorithm, assuming that the switches are Catalyst 6500s?
4.	Suppose that the EtherChannel is a Layer 3 interface on both switches so that each switch uses one MAC and one IP address. Should you choose the src-dst-mac or src-dst-ip algorithm to maximize the load distribution across all the links?