Chapter 2 Review Questions & Answers
| 1: | Which L2F message type is the first sent when a NAS is establishing a L2F tunnel to the Home Gateway? |
| A1: | Answer: The L2F_CONF. |
| 2: | By default, what is the message sequence for PPP authentication between the remote access client and the NAS? Assume that CHAP authentication is used and that the client is not configured to authenticate the NAS. |
| A2: | Answer: The NAS sends a CHAP Challenge message, and the client replies with a CHAP Response message. |
| 3: | What is the sequence for PPP authentication between the client and the Home Gateway? Assume that the Home Gateway accepts all parameters sent by the NAS during session setup. |
| A3: | Answer: The Home Gateway sends the client a CHAP Success or Failure message. |
| 4: | By default, how is LCP negotiated between the remote access client and the Home Gateway? |
| A4: | Answer: By default, LCP is not negotiated between the client and the Home Gateway. Instead, LCP is negotiated between the client and the NAS, and the NAS passes these parameters to the Home Gateway during session setup. |
| 5: | Which parts of the PPP frame are NOT carried when the frame is forwarded by the NAS to the Home Gateway? |
| A5: | Answer: Flags, transparency data (ACCM or bit-stuffing), and the CRC. |
| 6: | How is a tunnel termination reason indicated within the L2F_CLOSE message? |
| A6: | Answer: Using the L2F_CLOSE_WHY and L2F_CLOSE_STR suboptions. |
| 7: | What does the error message %VPDN-6-SOFTSHUT: mean? How can this issue be resolved? |
| A7: | Answer: This indicates that the vpdn softshut command is configured on the NAS/Home Gateway. To resolve this issue, remove this command. |
| 8: | What are the MID and the CLID? |
| A8: | Answer: The MID is the Multiplex ID, and it uniquely identifies a session within the L2F tunnel. The CLID is the Client ID, and it uniquely identifies the L2F tunnel. |
| 9: | What is the significance of MID 0? |
| A9: | Answer: MID 0 identifies tunnel management packets (L2F_PROTO). |
| 10: | How is the L2F tunnel maintained in the absence of client traffic? |
| A10: | Answer: The L2F_ECHO and L2F_ECHO_RESP message types provide a keepalive mechanism that can be used to maintain the tunnel. |
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