A computer network configuration
1. The end systems (hosts) (end, host): a computer connected to a network, comprising a client and a server
Physical media, coaxial cables and optical fibers: 2. a communication link (communication link)
3. A packet switch (packet switch): a packet forwarding computer, including a router (Router) and a link layer switch (link-layer switch)
II. Classification of computer networks
1. scope classified according to the network
(1) a wide area network the WAN (Wide Area the Network)
(2) metropolitan area network MAN (Metropolitan Area the Network)
(. 3) LAN the LAN (the Network the Local Area)
(. 4) personal area network PAN (Personal Area Network)
2. classified according to the user's network
(1) a public network (public Network)
(2) a private network (private network)
III. Concepts of computer networks
(1) Internet (internet): computer network refers to a network consisting of a plurality of computers
(2) Internet (Internet): The world's largest current, open, a particular Internet from a number of interconnected network formed by
(3) a packet (packet ): segmenting the data transmitting side, header bytes are not coupled with each segment, the packet thus formed
a series of communication system from the transmission side to the receiving end system, a packet experienced: (4) a path (path) links and packet switch
(5) protocol (protocol): a set of communication conventions both computers must comply joint
(6) distributed applications (distributed application): distributed applications on different computers, the network together to complete a task
(7) socket interface (socket interface): end of run on a system program requesting Internet infrastructure to run another particular destination end system program data delivered embodiment
(8) Internet service provider (ISP): the following information is provided to the public service operators