A. ip route 22.214.171.124 255.255.255.224 126.96.36.199
B. ip route 0.0.0.0 0.0.0.0 188.8.131.52
C. ip route 184.108.40.206 255.255.255.224 220.127.116.11 254
D. ip route 0.0.0.0 0.0.0.0 18.104.22.168
Correct Answer: C
ccna like.Figure 18-2 PPP Layered ArchitectureThe process of a complete PPP session consists of four phases: the link establishment phase, the link quality determination phase, the network layer control protocol negotiation phase, and the link termination phase.Link Establishment Phase: Both sides of the PPP communication exchange configuration information using the link control protocol, and once the configuration information is successfully exchanged, the link is declared established. The configuration information usually uses default values, and only configuration options that do not depend on the network control protocol are configured by the link control protocol at this point. It is important to note that any non-link control protocol packets are dropped without any notice during link establishment.Link quality determination phase: the link control protocol is responsible for testing the quality of the link to see if it can carry the network layer protocols. In this phase, the link quality test is an option provided by the PPP protocol and may or may not be performed. Also, if the user selects the PPP verification protocol, the verification process will be completed in this phase. PPP supports two authentication protocols: Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). Network Layer Control Protocol Negotiation Phase: After both sides of the PPP session have completed the above two phases, they begin to configure the network layer protocols, such as IP and IPv6, using the appropriate network layer control protocols.Link termination phase: The link control protocol terminates the link by exchanging link termination packets. There are many reasons for link termination such as carrier loss, authentication failure, expiration of the idle cycle timer or administrator shutdown of the link.Chapter 18 HDLC and PPP .341 .18.1.3 PPP Frame StructureThe PPP frame structure is shown in Figure 18-3 and contains six fields, the meaning of each field is described below.Figure 18.3 PPP Frame Structure1 Flag (8 bits): indicates the beginning or end of the frame and consists of the binary sequence 01111110.
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