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Top: A sender and receiver are communicating over simple request and acknowledge lines. The sender drives the request line, and the receiver drives the acknowledge line. Middle: Timing diagram of two, two-phase communications. From the beginning, the sender initiates the first communication by raising the request line.
In telecommunications, a handshake is an automated process of negotiation between two participants (example "Alice and Bob") through the exchange of information that establishes the protocols of a communication link at the start of the communication, before full communication begins. [1]
A Simplified TCP State Diagram. TCP protocol operations may be divided into three phases. Connection establishment is a multi-step handshake process that establishes a connection before entering the data transfer phase. After data transfer is completed, the connection termination closes the connection and releases all allocated resources.
The Noise Protocol Framework, sometimes known as Noise or Noise Framework, allows for the design of secure channel protocols between two parties. Compared to TLS 1.3, the Noise Framework (described in the public-domain Specification [1]) allows the selection of a handshake pattern and cryptographic algorithms to produce a concrete protocol having the most appropriate cryptographic properties ...
The client sends an HTTP request (method GET, version ≥ 1.1) and the server returns an HTTP response with status code 101 (Switching Protocols) on success.This means a WebSocket server can use the same port as HTTP (80) and HTTPS (443) because the handshake is compatible with HTTP.
USB 2.0 added two additional handshake packets: NYET and ERR. NYET indicates that a split transaction is not yet complete, while ERR handshake indicates that a split transaction failed. A second use for a NYET packet is to tell the host that the device has accepted a data packet, but cannot accept any more due to full buffers.
The SOCKS5 protocol is defined in RFC 1928. It is an incompatible extension of the SOCKS4 protocol; it offers more choices for authentication and adds support for IPv6 and UDP, the latter of which can be used for DNS lookups. The initial handshake consists of the following:
There are two widely used protocol families which differ in the way communications are encoded: two-phase handshake (also known as two-phase protocol, Non-Return-to-Zero (NRZ) encoding, or transition signaling): Communications are represented by any wire transition; transitions from 0 to 1 and from 1 to 0 both count as communications.