2 Comments on “Which PPP subprotocol negotiates authentication options?”

1. Green Hosting Malaysia says:

   August 26, 2013 at 11:51 am

   PPP defines the Link Control Protocol (LCP). The job of the LCP is to establish, configure, and test the data-link connection. When hosts negotiate a PPP connection, they exchange LCP packets. These packets allow link partners to dynamically negotiate link options, including authentication, compression, and MLP. The protocol field is used to identify various Layer 3 protocols, such as IP or IPX. The LCP field allows for the following features:

   1. Authentication
   2. Callback
   3. Compression
   4. Multilink PPP
   Once the LCP establishes the Layer 2 connection, the Network Control Protocol (NCP) takes over. Link partners exchange NCP packets to establish and configure different network-layer protocols including IP, IPX, and AppleTalk. Each Layer 3 protocol has its own NCP. For example, IP’s NCP is IPCP. IPX’s NCP is IPXCP and Appletalk’s NCP is
   ATALKCP.

   
   
   
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2. Green Hosting Malaysia says:

   August 26, 2013 at 11:55 am

   LCP: A method of establishing, configuring, maintaining, and terminating the point-to-point connection.
   Link-establishment phase LCP packets are sent by each PPP device to configure and test the link. These
   packets contain a field called the Configuration Option that allows each device to see the size of the data,
   compression, and authentication. If no Configuration Option field is present, then the default configurations are
   used.

   
   
   
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