Weak current College】 【commonly used several network protocols on the.

Network protocol is a network of different workstations, the server can transfer data between the means of communication. As the network's development, different developers have already developed a number of protocols, but only a few are reserved. The Agreement eliminated many reasons---design is not good, bad or lack of support. But those who preserved agreement has undergone the test of time and become effective communication methods. Today's local area network of the most common three protocol is Microsoft NETBEUI, IPX/SPX NOVELL and cross-platform TCP/IP.

First, NETBEUI

NETBEUI is the IBM development of non-routing protocol used to carry NETBIOS communications. NETBEUI lack of routing and network layer addressing feature is its biggest advantage is its biggest drawback. Because it does not require additional network address and network layers and tail, so quickly and is very effective and applicable to only a single network or your entire environment are bridged together small workgroup environment.

Because routing is not supported, so the NETBEUI will never be the main enterprise network. NETBEUI frames unique address is a data-link layer and media access control (MAC) address, which identifies the network adapter but did not identify the network. Routers on the network address of the frame are forwarded to the final destination, and NETBEUI frames completely lacks the information.

The bridge in accordance with the data link layer address to forward communication between the network, but there are many shortcomings. Because all of the radio communication must be forwarded to each of the network, network bridge does not scale well. NETBEUI special includes broadcast traffic count and rely on it to resolve naming conflicts. In General, bridging NETBEUI network rarely exceed 100 hosts.

Second, IPX/SPX

NOVELL NETWARE IPX is used for client/server protocol group, avoiding the NETBEUI weaknesses. However, IPX routing with full capacity for large enterprise networks. It allows many route network. Including 32-bit Internet addresses, in a single environment brings new different weaknesses.

IPX scalability by their senior broadcast traffic and high cost. Service Advertising Protocol (ServiceAdvertisingProtocol, SAP) are routed network hosts is limited to a few thousand. Despite the limitations of the SAP has been smart router and server configuration are overcome, however, the administrator of the mass IPX network remains very difficult work.

Third, TCP/IP

Each network protocol has its own advantages, but only TCP/IP allows the connection with the Internet completely. TCP/IP is in the 1960s by the Massachusetts Institute of technology and business organizations in the United States Department of Defense development, even if had been a nuclear attack and destroy the majority of networks, TCP/IP will still be able to maintain effective communication. ARPANET was developed based on the agreement and to become as scientists and engineers to Exchange media in Internet.

TCP/IP with the scalability and reliability requirements. Unfortunately at the expense of speed and efficiency.

Internet public in future, people began to discover the power of the global network. The universality of the TCP/IP Internet is still in use. Often not aware of the circumstances, the user is on your own PC is installed on a TCP/IP stack, enabling the network protocol in the most extensive global application.

TCP/IP for the 32-bit addressing scheme is not sufficient to support the upcoming accession to the Internet host and network number. Which may replace the current implementation of the standards is IPv6.