Tuesday, July 5, 2011

Computer Network Architecture

Network That is?

Here you will learn about the architecture of computer networks, physical design, logical topology, the introduction of the protocol, communications planning and communications technology base. To be able to build, maintain and secure computer network, first you must know that what is meant by the network and how data can move through a wired or wireless network. A person with good networking skills will be able to tell that the network consists of computers, wires, PRI lines, routers, switches, NIC cards, PBXs, TIS, fiber optic and Ethernet cables.

Someone who has a strong background in the science data network should know that a network consists of a server as a control centers, workstations, routers, hubs, WAN, LAN, fiber optic and Ethernet cables and other devices. Both the telecommunications and data communications everyone agrees that the cabling is the most important part of computer networks.

The simplest definition of the data network to connect two or more computers with each other to share data and resources and communicate. Networks exist in various sizes and shapes, from a home network for the WAN network. Despite the different roles and different network sizes, but it has some general similarities in all tissues, such as protocols, architecture and topology design.

Basically a computer network architecture is divided into three basic types such as

1. LAN (local area network), MAN (metropolitan area network) and WAN (wide area network. A LAN consists of two or more computers in the same room by using a fiber optic or Ethernet cables to connect computers in a LAN network, private networks and office LAN network.

2. MAN type of network consisting of two or more computers in two different geographical locations in the same city. MAN can use (fiber optic cable) or wireless network and a number of communication devices used in a MAN network.

3. WAN consists of two or more computers in two different geographical areas (cities or countries) and with different methods, for connecting computers within a network provider that leases dibutuhak WAN (ISDN signals, radio waves, microwaves, dial-up connection and connectivity via satellite). The Internet is the world's largest WAN. With the invention of wireless networks, mobile technologies and optical cables use has declined.

There are several terms that describe the network architecture.

Computer Network Topology
Topology or physical design is closely related to network architecture. Topology defines how the network is physically connected. There are three main types of topologies.

    Star Topology: In a star topology all network components are connected to a central point, which is a hub or switch. Star topology is commonly used in LAN.
    Bus topology: In Bush topology network components are connected to the same cable. This is also called a linear bus or backbone.
    Ring Topology: In a ring topology all the components are connected to each other in a ring. Token continue through the loop.

Terminology Network architecture

    CAN (Campus Area Network): CAN is the type of network connecting office buildings, universities, educational or office complex.
    Intranet: Intranet is a private network owned by the office, college or organization and that can only be accessed by legitimate users or permitted.
    Internet: The Internet is a network of networks and connecting millions of computers and networks to each other with different designs.
    MAN (metropolitan area network): MAN is the type of network designed for a city. MAN network is larger than a LAN but smaller than a WAN network.
    SAN (Storage Area Network): SAN is a type of network used to connect the related devices such as RAID storage file servers, and tape systems.
    VLAN (virtual local area network): VLAN is a type of network that allows computers on a separate physical network to be able to communicate as if they were connected to the same network.
    Clien-server: Client-Server is a special type of network system that provides services and systems that provide and receive services is called the Work Station. The main services include share files, printers, scanners, CD, Hard disk, processor, Internet connection and other services.
    Peer-to-peer: This is the type of sharing network where every computer has the same function. No centralized server is required in the Peer to peer networks.

Computer Network Protocols and the OSI Model

Protocol is a most important component of computer network systems. Protocol means a set of arrangements, agreed by way of communication or language where all the computers and devices to understand each other. An error-checking protocol will define how the data is sent and received, and transmitting data between systems. There are many protocols and the following is a list of the most common protocols used in computer communications.

    AppleTalk: AppleTalk is a communications protocol developed by Apple's system for connecting Macintosh computers to the printer.
    Asynchronous Transfer Mode (ATM): ATM is a protocol that runs the type of data in packets with fixed size. Fixed packet size with a high speed, data security, video and voice communications over the same network.
    DECnet: DECnet is a protocol developed by Digital Equipment Systems for connecting PDP and VAX systems.
    Ethernet: Ethernet is a LAN protocol developed by Intel, Xerox and Digital Equipment Systems. Ethernet LAN standard is the most widely used for computer communications.
    Fiber Distributed Data Interface (FDDI) FDDI is a protocol used to transmit data over fiber optic cable.
    Internet Protocol (IP): IP is a protocol of data transmission between the network with IP packets, originally developed by the DOD (department of defense). TCP / IP (Transmission control protocol / Internet protocol) is a protocol suite and the FTP, HTTP, e-mail, Telnet is an IP protocol.
    Internetwork Packet Exchange (IPX): IPX is a network protocol used by the Novell Netware operating system.
    NetWare: Netware is a LAN protocol developed by Novell company.
    Signaling System 7 (SS7) SS7 is a telecommunications protocol that was developed by the International Telecommunication Group.
    Systems Network Architecture (SNA): SNA is a set of protocols developed by IBM mainframe systems.
    Token Ring: Token Ring is a LAN protocol developed by IBM in which the system has the token before they transmit the data. Transmission Control Protocol / Internet Protocol (TCP / IP): TCP / IP is a suite of protocols used to connect computers on the internet. TCP / IP is the protocol most commonly used.
    X.25: X.25 is a protocol developed by the CCITT for packet switched networks.

Protocol combined with a layer of the OSI model. OSI model is an ISO standard for communications systems. There are seven layers in each layer of the OSI model and perform different functions. Seven layers of Application, Presentation, Session, Transport, Network, Data link and physical layers. Each layer knows how to communicate with upper and lower layers. You can remember the names of all the layers with the following sentence.

"Everyone seems to need data processing"

Logical Network Design Planning

When you plan a logical network design you can start from scratch or upgrade an existing network. You must have sufficient information about the networking components, hardware, protocols and topologies. You should analyze the traffic patterns, security requirements, future expansion, and the ability of servers, internet access to clients, FTP and others. You should also make plans for disaster recovery, data recovery and instant problem-solving techniques.



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