Friday, 23 March 2012

3rd entry

these are few information that I gained from my last class.....

a connection between 2 computer by direct cabling = basic network

-connecting computer with other computer/other devices to enable them to communicate with each other.
-a collection of hardware components and computers interconnected by a communication channel that allow sharing of resources and information.

- server is a computer hardware system dedicating to running one or more such services (as a host), to serve the needs of users of the other computers on the network.

1.LAN=local area network
2.WAN=wide area network
3.MAN=metropolitan area network
4.PAN=personal area network

-confined to a relatively small area
-cable are used to connect the network
-1 computer=1 server

-connect larger geographic area
 eg. Johor Bahru, Malaysia,
-cable or satellite uplinks used to connect them
-is complicated
-use multilexing to connect local & metropolitan network=hybrid network

-interconnects users in a region larger than LAN but smaller than WAN
-The latter usage is also sometimes referred to as a campus network

-computer network organized around an individual person.
-it can be constructed with cables or wireless.
-personal area networks genarally cover a range of less than 10 meters (about 30 feet).

# topology
# protocol
# architecture
--- topology describes the arrangement of system on a computer network. It defines how the computer or nodes, whithin the network are arranged and connected to each other. Some common network topologies include star, ring, line, bus and tree configuration.
---network protocol is a set of rules that governs the communication between computers on a networks. These rules include guidelines that regulate the following characteristic of a network: access method, allowed physical topologies, type of cabling, and speed of data transfer.
Below is some of the common-used network symbols to draw different kind of network protocol:
---network architecture is the design of a communication network. It ia a framework for a specification of a network's phisical component and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation.

+bounded media
+unbounded media

-phisical links through signals are confined to narrow path
-also called guided media
-made up of an external conductor(usually copper) bounded by jacket material
-they offer high speed, good security and low cast.
-3 common types of bounded media are coaxial cable, twisted pairs cable and fibre optics cable.
-eg. bridges, routers

-no phisical connection is required.
-space of air is the transmission medium for electromagnetic waves
-source and destinatio can be static or mobile.
-broad spectrum from low to high bandwidth is available.
-can be quickly implemented.
-eg. switches, hubs gateways

    bridges--devices that filter data traffic at network boundary. Bridges reduce the amount of traffic on a LAN by dividing it into 2 segment.

     routers--devices that forward data packets between computer networks, creating an overlay internetwork. A routers is connected to two or more data lines from different networks.

   switches--is a small hardware device that joins multiple computers together within one local area  network(LAN)
    hubs--a common connection point for a devices in network. Commonly used to connect segments of a LAN.
hub system

    gateway--an internetworking system capable of joining together two networks that use different base protocols. It can be implemented completely in a software, completely in hardware, or as a combination of both.

Hopefully u will gain some benefits from these information...tq :D


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