Chapter Review Questions

1. In what ways is an ATM LSR different from a frame-based LSR?

2. What is the default control VC for LDP?

3. What is the preferred control mode for LDP on the ATM LSRs?

4. Name two ways that LDP can detect loops.

5. Which two features must an ATM switch have in the control plane to become an ATM LSR?

6. Which label space is used on an LC-ATM interface?

7. What IP precedence values are by default mapped to the standard LVC type with Multi-VC TBR?

8. What would be the reason to disable the head end VCs on an LSC?

9. Why does the Cisco equipment not advertise bound IP addresses of the LSR on LC-ATM interfaces with LDP?

10. What is the advantage and disadvantage of VC-Merge?

What You Will Learn

By the end of this chapter, you should know and be able to explain the following:

What kind of switching method CEF is

■ Why CEF is needed for the forwarding of packets in MPLS networks

■ How CEF load balancing works

■ How to troubleshoot CEF problems

Being able to answer these basic questions on CEF helps you to understand how one of the building blocks of MPLS in Cisco IOS works. By the time you finish this chapter, you will have a solid understanding of CEF and why it is essential to the operation of MPLS networks.

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