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The Point-to-Point Protocol (PPP), a data connection layer communication protocol, is used to send multiprotocol data between two computers that are linked directly to one another. It is a well-liked byte-oriented protocol for broadband communications, with quick speeds and heavy loads. Information is transferred in frames since it is a protocol for the data connection layer. It also goes by the name RFC 1661.
Table of Contents
Point to Point Protocol
The Point-To-Point protocol is largely responsible for connections over various links.
- The process for mutual device authentication is described in this protocol
- The PPP protocol also specifies the frame format that must be delivered back and forth between the devices
- Additionally, this protocol describes how network layer data is encapsulated in data link frames
- Before sharing data, two devices can negotiate the establishment of a link using the PPP protocol
- This protocol offers a variety of network layer functions and supports many network-layer protocols.
Advantages of PPP
PPP was initially developed as an encapsulating method for IPv4 packet transport over point-to-point links. PPP offers a standardised approach for multiprotocol packet transport over point-to-point connections.
The fact that PPP is non-exclusive is just one of the many benefits of using it. There are not many traits that PPP possesses that HDLC does.
- The link quality management function, shown in the figure, is responsible for managing link quality. If PPP discovers too many issues, it disables the link.
- There is support for PAP and CHAP authentication. This feature is discussed in further detail and put to use in the following section.
PPP Frame Format
1. Flag
The 1-byte flag field with the bit pattern: 01111110 is where the PPP frame begins and ends. It is important to remember that this pattern fits the HDLC flag pattern. But there must also be a differentiation because HDLC is a bit-oriented protocol, and PPP is a byte-oriented protocol.
2. Address
The broadcast address 11111111 is the default value for this field in the PPP protocol. This byte may be excluded with the consent of any party.
3. Control
The value of this field is similarly 11000000, a fixed value. You know that PPP allows error detection and does not provide flow control. Each party has the power to agree to exclude this byte. The value of this field is similarly 11000000, a fixed value. You are well aware that PPP allows for error detection and does not provide flow control. Each party has the power to agree to exclude this byte.
4. Protocol
This field defines the data field’s contents. User information, as well as other data, may be present. By default, this field has a length of 2 bytes.
5. Payload field
This field carries the data from the network layer. The maximum length for this field is 1500 bytes. Furthermore, this is a matter for discussion between the communication endpoints.
6. FCS
It has a standard CRC of 2 or 4 bytes (Cyclic redundancy check)
Uses of PPP
The two main PPP applications are as follows:
- It is frequently used in high-speed, high-load broadband communications. For example, the internet is frequently used and responds swiftly
- Various protocols are used to send data between two connected computers (point to point). It is widely used in point-to-point devices like routers since it is a WAN protocol rather than a straightforward LAN ethernet standard
