Chapter 5 Review Questions & Answers
| 1: | What is the function of the control connection? |
| A1: | Answer: The control connection provides a mechanism to authenticate a peer, and dynamically establish, maintain, and tear down data sessions. |
| 2: | Is a control connection required? Why or why not? |
| A2: | Answer: A control connection is not required if L2TPv3 sessions are statically configured. |
| 3: | What is the function of the session ID and the cookie? |
| A3: | Answer: The session ID is used to associate data (session) messages with attachment circuits. The cookie provides additional assurance that data messages are associated with the correct attachment circuit, as well as protecting against blind insertion attacks. |
| 4: | For what are the Message Digest and Control Message Authentication Nonce AVPs used? |
| A4: | Answer: These AVPs are carried in control connection messages and are used to support peer authentication. The Message Digest AVP is also used to ensure message integrity. |
| 5: | What three messages are exchanged in order to establish a control connection? |
| A5: | Answer: Start-Control-Connection-Request (SCCRQ), Start-Control-Connection-Reply (SCCRP), and Start-Control-Connection-Connected (SCCCN). |
| 6: | What three messages are exchanged in order to establish a session? |
| A6: | Answer: Incoming-Call-Request (ICRQ), Incoming-Call-Reply (ICRP), Incoming-Call-Connected (ICCN). |
| 7: | If an LCCE wants to tear down a control connection, what message does it send? |
| A7: | Answer: It sends a Stop-Control-Connection-Notification (StopCCN) message. |
| 8: | If an LCCE wants to tear down a session, what message does it send? |
| A8: | Answer: It sends a Call-Disconnect-Notify (CDN) message. |
| 9: | What message does an LCCE send to its peer to signal that attachment circuit status has changed from active to inactive (or vice-versa)? |
| A9: | Answer: It sends a Set-Link-Info (SLI) message. |
| 10: | What is the major difference between L2TPv2 and L2TPv3 with regard to supported Layer 2 payloads? |
| A10: | Answer: L2TPv2 only supports the tunneling of PPP frames, whereas L2TPv3 provides a generic framework for tunneling Layer 2 frames. |
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