Selasa, 26 Disember 2017

Network Architecture


Network Architecture
     Is the configuration of computers, devices, and media on a network.There are two types of it:

1.CLIENT SERVER
    -on a client server network, one or more computers act as a server, and the other computers on the network request services from the server.
    -the clients are other computers and mobile devices on the network that rely on the server for its resources.



2.PEER TO PEER 
    -each computer,called a peer, has equal responsibilities and capabilities,sharing hardware
(such as printer), data, or information with other computers on the peer to peer network.
    -peer to peer is for small network fewer than 10 computer and do not need training and specific operating system.









CATEGORYCLIENT-SERVERPEER TO PEER
SIZEfor medium and large networkfor small network
TRAININGneeds trainingdoes not need training
SET UPdifficult to set upeasy to set up
INSTALLATIONmore expensive to installless expensive to install

Selasa, 19 Disember 2017

About computer network



Definition - What does Computer Network mean?

 A computer network is a group of computer systems and other computing hardware devices that are connected together through communication device and transmission media.


                           


COMMUNICATION DEVICETRANSMISSION MEDIA
network cardinfrared
wireless access pointbroadcast radio (bluetooth)
dial-up modemcellular radio (2G,3G,4G)
digital modem (ISDN,DSL,Cable Modem)microwave
wireless modemcommunication satellite
router
switch
hub



















ADVANTAGES AND DISADVANTAGES OF NETWORK


Advantages
- sharing hardware which it can reduce the cost of purchasing hardware
-sharing software which it can reduce the cost of buying software
-sharing transferring files within networks is very rapid
-sensitive files and programs on a network can be password protected

Disadvantages
-breakdowns and possible loss of resources means that we may loss the important data
-expensive to buy and replace cables and other hardware
-security threats there are hackers who are trying to steal valuable data
-heavy users who consume a lot more bandwidth will affect other users

Types of Computer Security Risk and Security Measure

Types of Computer Security Risk  Definition of computer security risk: Any event or action that could cause a loss of or damage to ...