Scenario 7 IP Telephony in a Switched Network

This scenario uses a simple two-switch network to reinforce the concepts needed to properly implement IP telephony. Think about supplying power to the Cisco IP Phone, as well as how to implement QoS trust within this network. Use Figure 20-7 as a reference for the following questions.

Figure 20-7 Network Diagram for Scenario 7

Figure 20-7 Network Diagram for Scenario 7

User PC

1. Assume that Catalyst B supports Power over Ethernet. If interface Fa1/0/1 has its default configuration, will power be supplied to the IP Phone? Now suppose that someone has entered the power inline never command for that interface. What command could you use to begin supplying power to the phone dynamically?

2. Where should a QoS trust boundary be implemented? In other words, which switches should trust incoming QoS information and which ones should not?

3. On Catalyst B, configure interface FastEthernet 3/1 to inform the IP Phone to use VLAN 17 for voice traffic. Also add a configuration command to ensure that no QoS trust is extended to the IP Phone's PC data port.

4. What configuration commands would be necessary to enable QoS trust on Catalyst B's Gig 1/0/1 uplink and to disable trust on port Fa1/0/2 where the user PC is connected?

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