Where is ppp used

On reaching the terminate phase, the link moves to the dead phase which indicates that the carrier is dropped which was earlier created. The role of LCP is to establish, maintain, configure, and terminate the links. It also provides negotiation mechanism. There are two types of authentication protocols, i.

It is a two-step process. Suppose there are two routers, i. In the first step, the router 1 wants to authenticate so it sends the username and password for the authentication.

In the second step, if the username and password are matched then the router 2 will authenticate the router 1 otherwise the authentication failed.

Step 1: Suppose there are two routers, i. In this step, router 1 sends the username but not the password to the router 2. Step 2: The router 2 maintains a database that contains a list of allowed hosts with their login credentials. If no data is found which means that the router 1 is not a valid host to connect with it and the connection gets terminated.

If the match is found then the random key is passed. The hashed value is also known as Challenge. The challenge along with the random key will be sent to the router 1. Step 3: The router 1 receives the hashed value and a random key from the router 2. Then, the router 1 will pass the random key and locally stored password to the MD5 hashing function. The MD5 hashing function generates the hashed value from the combination of random key and password.

If the generated hashed value does not match with the received hashed value then the connection gets terminated. If it is matched, then the connection is granted. Based on the above authentication result, the authentication signal that could be either accepted or rejected is sent to the router 2. After the establishment of the link and authentication, the next step is to connect to the network layer.

The NCP is a set of protocols that facilitates the encapsulation of data which is coming from the network layer to the PPP frames. JavaTpoint offers too many high quality services.

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