Chapter 5

1. In what ways is an ATM LSR different from a frame-based LSR?
A1: Answer:

- The label value is encoded in the VPI/VCI fields.

- ATM LSRs forward cells.

- ATM LSRs are not capable of decrementing the TTL.

- LDP runs in Downstream-on-Demand label advertisement mode on ATM LSRs.

2. What is the default control VC for LDP?
A2: Answer: 0/32 is the default control VC for LDP.
3. What is the preferred control mode for LDP on the ATM LSRs?
A3: Answer: Ordered Control mode is the preferred mode for LDP on the ATM LSRs.
4. Name two ways that LDP can detect loops.
A4: Answer: LDP can detect loops in the following two ways:

- By means of a Hop Count TLV

- By means of a Path Vector TLV

5. Which two features must an ATM switch have in the control ...

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