Ppp which layer

It flags field standard HDLC field containing 8 bits. The bits pattern of the flag field is Address — It is a bit field that contains the binary sequence. In case of broadcast, the sequence is set to , PPP does not assign individual station addresses.

Control — This is a one-byte long field with the binary sequence The value shows that the frame does not contain any sequence numbers. It provides a connectionless link service for a point-to-point link. Protocol — Protocol field is either one bit or two bits long that identify the protocol encapsulated in the information field of the frame.

If the field is 2-byte, the field identifies the protocol of the PPP payload. If both PPP peers agree for the compression of the protocol field during LCP negotiation, the Protocol field is reduced to one byte for the protocol identification. It specifies the kind of packet in the data field i.

The data field can contain user data or other information. If the length is not negotiated using LCP during line setup, a default length of bytes is used.

It is a byte - oriented protocol that is widely used in broadband communications having heavy loads and high speeds. Since it is a data link layer protocol, data is transmitted in frames. It is also known as RFC It also imparts negotiation for set up of options and use of features by the two endpoints of the links.

PPP is a byte - oriented protocol where each field of the frame is composed of one or more bytes. 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.

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