Point-to-Point Cheat Sheet

Question 1

Difference between LCP(Link Control Protocol) and NCP(Network Control Protocol)

Answer 1

• LCP provides for the establishment, configuration, and maintenance of a PPP link.
• NCP negotiates the configuration of each network layer protocol (such as IP) carried by PPP

Question 2

What is used for protocol multiplexing?

Answer 2

Multiple NCP’s (Network Control Protocols)

Question 3

What is used for optional authentication?

Answer 3

PAP & CHAP

Question 4

What is used for optional compression?

Answer 4

Stacker & predictor

Question 5

What is the Stacker PPP compression algorithm ?

Answer 5

Examines the data and only sends each data type once and sends information indicating to the other end where each type occurs within the data stream. The other end reassembles the data into the various data types from the data stream.

Stacker tends to be more CPU (processor) intensive and less memory intensive.

Question 6

What is the predictor PPP compression algorithm?

Answer 6

-Examines the data to see if it is already compressed and sends it. It does not waste time compressing data that is already compressed.

Predictor tends to be more memory intensive and less CPU intensive.

Question 7

With what is loopback detection provided by?

Answer 7

LCP

Question 8

What is used for load balancing?

Answer 8

Multilink PPP