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3.1.1 - Different Types of Networks

Topic 3 Networks
by

michael brooke

on 4 May 2012

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Transcript of 3.1.1 - Different Types of Networks

Topic 3 - Networks
LAN
Local Area Network
WAN
Wide Area Network
WLAN
Wireless Local Area Network
Client

Client computers, or workstations, are the normal computers that people sit at to get their work done.
Server
Servers are special, powerful computers that provide ‘services’ to the client computers on the network.

These services might include:

* Providing a central, common file storage area
* Sharing hardware such as printers
* Controlling who can or can’t have access the network
* Sharing Internet connections

Servers are built to be very reliable. This means that they are much more expensive that normal computers.

In a small network one server might provide all of these services. In a larger network there might be many servers sharing the work.
Different Types of Network
A network hub is a fairly unsophisticated broadcast device. Hubs do not manage any of the traffic that comes through them, and any packet entering any port is broadcast out on all other ports. Since every packet is being sent out through all other ports, packet collisions result—which greatly impedes the smooth flow of traffic.
A switch is a more ‘intelligent’ device than a hub: if it receives a message, it checks who it is addressed to, and only sends it to that specific computer. Because of this, networks that use switches are more secure than those that use hubs, but also a little more expensive.
SAN
Storage Area Network
A storage area network (SAN) is a type of local area network (LAN) designed to handle large data transfers. A SAN typically supports data storage, retrieval and replication on business networks using high-end servers, multiple disk arrays and Fibre Channel interconnection technology.
VLAN
Virtual Local Area Network
VLAN 1
VLAN 2
VLAN 3
Office Floor 1
Office Floor 2
A VLAN is a logical not physical group of computers defined by software. This allows groups of computers to be on the same LAN although they may be in different physical locations.
Intranet

A local or restricted communications network, esp. a private network created using World Wide Web software.
Extranet
An extranet is an
intranet that can be partially accessed by authorized outside users, enabling businesses to exchange information over the Internet securely.
Michael Brooke
michael@emjbe.net
Hubs and Switches
Router
A router is a device that forwards data packets between computer networks,
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