1. Components of wireless LAN & Its connection to the Internet
Group 04- From Lecture 04
Components of wireless LAN
&
Its connection to the Internet

2. Components of wireless LAN
Wireless Clients
Wireless Access point
Network switch
Router
Firewall
Internet service provider

3. Wireless client
device such as Notebooks, or any kind of mobile devices which are inter linked with wireless network area 
Using Wi-Fi, wireless network card, bluetooth or etc.

4. Wireless Access Point
WAP is a device that act as a central transmitter and receiver of WLAN radio signals between wired and wireless networking device .
Is generally small and with build in network adapter, antenna, and radio transmitter

5. Network switch
Network switch acts as a hub to interconnect all equipments within a local area network (LAN).
Usually most network equipments like routers, wireless access points or additional cascading switch are connected to a network switch.

6. Router
Router is a device which join multiple wired or wireless networks together and is also a gateway, which joins the home's local area network (LAN) to the wide area network (WAN) of the Internet.
There is a piece of storage called routing table to maintain the configuration information
router can also filter traffic, either incoming or outgoing, based on the IP addresses of senders and receivers.

7. Firewall
A firewall is help to maintain and protect the network privacy and security.
There is Hardware and software firewalls
It also monitor and limit the flow of information through a computer network according to defined rules.
Firewall can also guard against unauthorized incoming messages or undesired outgoing messages.
Firewalls block traffic according to the listed ports that are listed by administrators in the equipment. Every communication from a network uses different ports, e.g (which is used to surf internet from a browser)

8. Internet service provider
an organization that provides access to the Internet
Generally charge by monthly and the rate depends on service provided
But some is free of charge like a wireless broadband programme developed by the Singapore Infocomm Development Authority (IDA)

9. Components of wireless LAN
Internet
router
Internet service
provider
Network switch

10. Thanks for your attention!
Present by Mei Xin
11/04/12