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

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

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.

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

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.

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.

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. 8080 (which is used to surf internet from a browser)

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 Wireless@SG is a wireless broadband programme developed by the Singapore Infocomm Development Authority (IDA)

Components of wireless LAN Internet router Internet service provider Network switch

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