Computer network (i)

1, the network: by a number of nodes and links to these nodes are composed of the link. Nodes in a network can consist of computers, hubs, switches, or routers.

2, the Internet: The network and network can be connected through the router, which constitutes a more coverage of the network.

3, Internet: The Internet is the world's largest internet. Traditionally, computers connected to the Internet have become hosts.

4, ISP: Internet service providers, also known as the Internet service provider.

5. Computer network: A collection of interconnected, autonomous computers.

6, the classification of computer networks:

(1), according to the scope of the network to classify

A, Wan Wan: The scope of the dozens of to thousands of km, WAN is the core of the Internet. (Purchase service and bandwidth yourself)

B, metropolitan area Network man: The scope of action is generally a city.

C, LAN LAN: Generally not more than 100 meters (buy their own equipment)

D, personal area network pan

(2), according to the network user classification

A, public network

B, private network

7. ISO: International Organization for Standardization

8, OSI/RM: Internet legal international standards, referred to as OSI

9. TCP/IP protocol: Internet de facto international standards. (the most widely quoted are not the international standard OSI, but the TCO/IP protocol)

10. Internet Protocol (Network PROTOCPLS): rules, standards or conventions for data interchange compliance

11.TCP/IP four-layer model and OSI seven-layer model

OSI Layer Seven Network model	Linux TCP/IP four-layer conceptual model	Corresponding network protocol
Application Layer (application)	Application Layer	TFTP, FTP, NFS, WAIS
Presentation Layer (Presentation)	Telnet, Rlogin, SNMP, Gopher
Conversation Layer (session)	SMTP, DNS
Transport Layer (Transport)	Transport Layer	TCP, UDP
Networking Layer (Network)	Internet Layer	IP, ICMP, ARP, RARP, AKP, UUCP
Data Link Layer	Network interface	FDDI, Ethernet, Arpanet, PDN, SLIP, PPP
Physical Layer (physical)	IEEE 802.1A, IEEE 802.2 to IEEE 802.11

Computer network (i)