WAN 2

• IP Connection Protocol (IPCP) is responsible for the transporting of TCP and UDP sessions across the PPP link and the verification of the successful interconnection. IPCP packet may not be exchanged until PPP has reached the Network-Layer may not be exchanged until PPP has reached this phase is reached should be silently discarded.

• Layer Connection Protocol(LCP) is used to automatically agree upon the encapsulation format options, handle varying limits on sizes of packets, detect a looped-back link and other common miss configuration errors, and terminate the link. Other optional facilities provided are authentication of the identity of its peer on the link, and determination when a link is functioning properly and when its failing.

• Link Control Protocol(LCP) is used to automatically agree upon the encapsulation format options, handle varying limits on sizes of packets, detect a looped-back link and other common miss configuration errors, and terminate the link. Other optional facilities provided are authentication of the identity of its peer on the link, and determination when a link is functioning properly and when its failing.

• IP Control Protocol(IPCP) is responsible for configuring, enabling and disabling the IP protocol modules on both ends of the point-to-point link. IPCP uses the same packet exchange mechanism as the Link Control Protocol(LCP). IPCP packets may not be exchanged until PPP has reached the Network-Layer Protocol phase. IPCP packets received before this phase is reached should of silently discarded.

• Password Authentication Protocol (PAP) is an authentication protocol that requires users to enter a password before accessing a secure system. The user’s name and password are sent over the wire to a server, where they are compared with a database of user account names and passwords. This technique is vulnerable to wiretapping (sniffing) because the password can be captured and use b

• Challenge Handshake Authentication Protocol (CHAP) is a type of authentication in which the authentication agent sends the client program a random value that is used only once and an ID value. Both the sender and peer share a predefined secret. The peer calculates a one-way hash using MD5 on the random value. The hash value is sent to the authenticator, which in turn builds that same string on its side, calculates the MD5 sum and compares the result with the value received from the peer. If the values match, the peer is identified.

Frame Relay

Ethernet

LAP-D

Q 921

PPP

RADIUS

IP

ATM

Frame Relay Term for Data Link Control identifier. It is a number which identifies a circuit which is terminated by Q. 931

ISDN Term for Data Link Connection identifier. It is a number which identifies a circuit which is terminated by Q. 931

Frame Relay Term for Data Link Control identifier. It is a number which identifies a private (PVC) or switched virtual circuit (SVC) in a Frame Relay network

Frame Relay Term for Data Link Connectionl identifier. It is a number which identifies a private (PVC) or switched virtual circuit (SVC) in a Frame Relay network

PAP

EAP

RADIUS

CHAP