Four computer network protocols

In computer network protocols, we will not introduce many well-known protocols. Now we will introduce a few very well-known protocols. We hope to broaden the knowledge scope. Although these protocols are not often heard, they are also important protocols in different fields.

Computer network protocol 1: Server Information block Protocol

Server Information Block Protocol SMB Protocol, Server Message Block Protocol) provides a method for network computer client programs to read and write files from service programs and request services. The SMB protocol can be used over the tcp ip protocol of the Internet, Internet Packet Exchange, NetBEUI, and other protocols. With the SMB protocol, applications can access remote server files, printers, folders, named queues, and other resources. Therefore, a client program can read, write, and update files on a remote computer. It can also communicate with any service program that receives SMB customer requests.
 
The Microsoft Windows operating system after Windows 95 includes SMB protocol support for customers and services. For Unix systems, Samba shared software programs exist. Before communication starts, the given customer and service program may constitute different protocol settings.
 
Microsoft provides Internet Engineering Task Group IETF) Public Open Source SMB, known as public Internet File System CIFS), which is more flexible than existing Internet applications such as file transfer protocol FTP.

Computer Network Protocol 2: Next Hop Resolution Protocol

In a computer network, the Next Hop Resolution Protocol NHRP, Next Hop Resolution Protocol) is a protocol or method used to send data from a computer to another computer that has been identified as the most direct route between that computer. If the receiving computer is in the same subnet, NHRP will tell the sending computer that the receiving computer is local, it can directly send subsequent data packets to the receiving computer through the subnet address without using the global network address. If the receiving computer is not in the same subnet, NHRP will send the most direct route of the receiving computer to the sending computer and then send the subsequent data packets to the router.

NHRP is a basic request response protocol. All users create a network knowledge list and use it to respond to information. This table can be used for all subsequent communications. With this knowledge, the computer can send data directly to the target computer or to the egress router using the calculated Destination Address) without using the network address. This operation is performed at the communication layer of the data link layer, instead of at the network layer, it is sometimes called "working at nearline speed" because very few program commands need to be executed and sometimes placed on swap devices ). NHRP is advantageous for this: it reduces the number of packet jumps in the same subnet, and allows data packets to further use faster machine addresses.

NHRP is developed by an Internet Engineering Task Group's cross-NBMA network interconnection team. It is the main component of multi-protocol ATMMPOA) and the RFC request annotation of IETF) 2332 the next hop parsing protocol is described in detail.

Computer network protocol 3: Media Gateway Control Protocol

Media Gateway Control Protocol MGCP, Media Gateway Control Protocol), also known as H.248 or MEGACO, is a standard Protocol for processing multimedia signals. This Protocol defines the communication methods between different media gateways and provides the conversion between video signals on telephone circuits and Internet or other network data packets. A media gateway includes an endpoint, that is, the call agent can create, modify, and delete connections. Megaco and H.248 protocols can be understood as enhanced versions of the MGCP protocol.
 
IETF, the Internet Engineering Task organization, named the Protocol corfc 3015, and ITU Telecommunications Commission ITU-T named it H.248. There is an early UTI-T protocol H.323, which is applied in LAN and cannot be applied in the public network. The MCGP and Megaco/H.248 models break down the gateway into a media gateway MG) and the Media Gateway controller MGC), so that it has the characteristics of a large network.
 
Media Gateway Control Protocol MGCP) evolved from SGCP simple Gateway Control Protocol) and IPDC Internet Protocol Device Control. You can find the corresponding description in RFC 2705, which is specified by MGCP. A master-slave model is used at the application layer, and the endpoint is the caller. MGCP allows the Controller to address each communication end point and determine its media support capabilities, so that each end point has the ability to choose its own Acceptable services. The latest Megaco/H.248 protocol supports multi-port gateways. The concept of multiple gateways is similar, and TDM is also supported) and asynchronous transmission mode (ATM ).

Computer Network Protocol 4: Link Control Protocol

In Point-to-Point Protocol (PPP), The Link Control Protocol (LCP) establishes, sets, and tests data links to the Internet. Before establishing a communication through a point-to-point link, each point-to-point link end must issue a Link Control Protocol package. Regardless of whether the connection of the Link Control Protocol package does not accept its equivalent connection authentication, their package size restrictions are the same and there are the same error control. Basically, the Connection Control Protocol package checks the connection of the telephone line to see if it supports data transmission at the expected transmission speed. Once the LCP package accepts this link, the transfer will be performed in the network; if the LCP cannot undertake the transfer task, it will abort the link.
 
Link Control Protocol (LCP) packages are divided into three types:

◆ The link configuration package is used to establish and set the link

◆ The link stop package is used to stop the link.

◆ Link maintenance package is used to manage and debug links