Hcia-r & s self use notes (26) PPP

PPP（7/28,40min）

Serial link is often used in wan to provide long-distance data transmission , Advanced data link control HDLC（High-Level Data Link Control） And point-to-point protocols PPP（Point to Point Protocol） Are two typical serial port encapsulation protocols （ Data link layer protocol ）

[R1]int Serial 4/0/0
[R1-Serial4/0/0]link-protocol hdlc

huawei Default ppp,cisco Default hdlc

Unwanted MAC Address , Don't need to, ARP

HDLC Interface address borrowing

[R1-Serial4/0/0]int lo 0
[R1-LoopBack0]ip add 1.1.1.1 32
[R1-LoopBack0]qu
[R1]int s4/0/0
[R1-Serial4/0/0]ip address unnumbered interface LoopBack 0

The serial interface can be borrowed Loopback Interface IP Address and establish a connection with the opposite end .

Realize that multiple physical interfaces use the same address （ To save address ）

It's for now HDLC They are all improved by Cisco HDLC

[R1]ip route-static 12.0.0.2 32 Serial 4/0/0

Use the outgoing interface to write static routes

PPP Protocol is a point-to-point link layer protocol , It is mainly used for point-to-point data transmission on full duplex synchronous asynchronous link .

name	authentication	Error detection	Error recovery	Support synchronous or asynchronous links
HDLC	×	√	×	×
PPP	√	√	√	√

The main test is PPP The authentication function of

PPP Components

Ethernet is also divided into two layers , On LLC, Next MAC

PPP Two authentication modes ：

 

①② Operation and configuration pap,③ Line for sending pap voucher

The above is one-way certification , You can also enable two-way authentication , That is, both ends are configured with authentication and authenticated