Wifi Technology

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Disediakan oleh: Rosnan Mohamad

Transcript of Wifi Technology

Disediakan oleh:

Rosnan Mohamad

Pengenalan:

1.Infrastruktur

2.Kemudahan

1.Alat salin Rakam

2.Pengimbas

3.Cetakan

4.Penyimpanan

5.Rangkaian

6.Pusat Ekses Internet

Networking

●Perkongsian Maklumat dan data

●Perkongsian kemudahan alat sokongan

●Penyebaran Maklumat dan berita

●Penyimpanan data (Storage)

Talian Tanpa Wayar

Pengenalan Networking:-

Networking adalah jaringan atau pautan

antara komputer dengan komputer.

Perhubungan ini membolehkan

pengguna menghantar dan menerima

sebarang data.(Pergerakan Data dua

Hala).

Pengenalan Networking:-

Komputer yang mempunyai

“Networking” atau jaringan boleh:-

1.Berkongsi Data (Data Sharing)

2.Berkongsi Pencetak

3.Ekses Internet dengan satu akaun

Jenis Networking:-

LAN –Local Area Network

Pelayan (server)

Jaringan dalaman sahaja, antara komputer berdekatan (satu pusat )

Contoh Penyambungan menggunakan LAN

Pergerakan data antara komputer yang memiliki jaringan

Lan menggunakan penyambungan tanpa wayar- wireless

Jenis Networking:-

MAN –Metropolitan Area Network

Jaringan antara komputer dan komputer merangkumi sesuatu bandar

sahaja.Ianya lebih besar kawasannya berbanding dengan LAN

Jaringan ini kebiasaannya menggunakan kabel optik atau tanpa kabel

(wireless)

“ “A MAN is optimized for a larger geographical area than is a LAN,

ranging from several blocks of buildings to entire cities. As with local

networks, MANs can also depend on communications channels of

moderate-to-high data rates. A MAN might be owned and operated

by a single organization, but it usually will be used by many

individuals and organizations. MANs might also be owned and

operated as public utilities. They will often provide means for

internetworking of local networks. ”

Jaringan menggunakan kaedah

MAN.

Jenis Networking:-

WAN –WIDE Area Network

Jaringan yang lebih luas merangkumi

keseluruh dunia.-Internet

Jaringan antara komputer di seluruh Dunia

Untuk membolehkan komputer berhubung antara nya

memerlukan :-

1. NIC – Network Interface Card (Kad

Jaringan)

Kad ini merupakan perantara antara Komputer dengan

komputer yang lain menggunakan kabel atau wayar.

Kad perantara komputerdengan komputer

tanpa wayar.

Kedudukan Kad pada papan induk

Untuk membolehkan komputer berhubung antara nya

memerlukan :-

2. Wayar RJ45

Untuk membolehkan komputer berhubung antara nya

memerlukan :-

3. Hub (Switch)

Untuk membolehkan komputer berhubung antara nya

memerlukan :-

4. Access Point- untuk jaringan tanpa wayar

Untuk membolehkan komputer berhubung antara nya

memerlukan :-

5. Router /Server (pelayan)

-bertindak sebagai pelayan maya (virtual server)

Untuk membolehkan komputer berhubung antara nya dan

internet memerlukan :-

6. Modem (modulate-demodulate) Modem – jenis dial-up- menukar isyarat analog ke digital dan

digital ke analog.

A modem (from modulate and demodulate) is a device that

modulates an analog carrier signal to encode digital

information, and also demodulates such a carrier signal to

decode the transmitted information. The goal is to produce a

signal that can be transmitted easily and decoded to reproduce

the original digital data. Modems can be used over any means

of transmitting analog signals, from driven diodes to radio.

Experiments have even been performed in the use of modems

over the medium of two cans connected by a string.[

Untuk membolehkan komputer berhubung antara nya dan

internet memerlukan :-

6. Modem (modulate-demodulate)

Modem dari jenis ADSL-modem jenis Broadband

Untuk membolehkan komputer berhubung dengan internet

memerlukan :-

7. ISP- Internet supply Provider

Contoh Pembekal Perkhidmatan Internet

Apakah dia WIFI ?

Short for ‘wireless fidelity’. A term for

certain types of wireless local area

networks (WLAN) that use

specifications conforming to IEEE

802.11b. WiFi has gained acceptance

in many environments as an

alternative to a wired LAN. Many

airports, hotels, and other services

offer public access to WiFi networks so

people can log onto the Internet and

receive emails on the move. These

locations are known as hotspots

Teknik penyambungan WIFI :-

Teknik penyambungan WIFI :-

Kad PSMCIA-untuk Notebook yang

tidak mempunyai wireless bina

dalam.

USB wireless untuk kegunaan

desktop atau Notebook yang tidak

mempunyai wireless bina dalam.

Router

Wireless Access

Point

Teknik penyambungan WIFI :-

Teknik penyambungan WIFI :-

ADSL modem + Router + access Point

ISP

Pekakasan dan fungsi peralatan:-

Router:-

A router is a computer networking device that

buffers and forwards data packets across an

internetwork toward their destinations, through a

process known as routing. Routing occurs at layer

3 (the Network layer e.g. IP) of the OSI seven-

layer protocol stack.

Pekakasan dan fungsi peralatan:-

Access Point

In computer networking, a wireless access point (WAP or AP) is a device

that connects wireless communication devices together to form a wireless

network. The WAP usually connects to a wired network, and can relay data

between wireless devices and wired devices. Several WAPs can link together

to form a larger network that allows "roaming". (In contrast, a network where

the client devices manage themselves - without the need for any access points

- becomes an ad-hoc network.) Wireless access points have IP addresses for

configuration.

Pekakasan dan fungsi peralatan:-

A network switch, packet switch (or just switch) connects segments of a

packet network. In the majority of cases, this is an ethernet local area network

with dozens or more stations.

The switch is an OSI layer 2 networking device that performs transparent

bridging (connection of multiple network segments with forwarding based on

MAC addresses) at up to the speed of the hardware. Common hardware

includes switches, which can connect at 10, 100, or 1000 megabits per second

(Mbit/s), at half or full duplex. Half duplex means that the device can only send or

receive at any given time, whereas full duplex can send and receive at the same

time. The use of specially designed expansion also makes it possible to have

large numbers of connections utilizing different mediums of networking, including

Ethernet, Fibre Channel name frequently used technologies.

Pekakasan dan fungsi peralatan:-

An ADSL transceiver, also known as a ADSL modem or DSL modem,

is a device used to connect one or more computers to a phone line, in

order to use an ADSL service. Some ADSL modems also manage the

connection and sharing of the ADSL service with a group of machines,

making an ADSL router or ADSL modem/router a more accurate

name for the device. A DSL modem acts as the ADSL Terminal Unit or

ATU-R, as the telephone companies call it. The acronym NTBBA

(network termination broad band adapter, network termination broad

band access) is also common in various countries.

ADSL Modem

Pekakasan dan fungsi peralatan:-

USB wireless LAN

Digunakan untuk komputer yang tidak mempunyai

kemudahan jaringan tanpa wayar

Wifi adalah teknologi tanpa wayar yang

tidak memerlunya apa-apa penyambungan

wayar pada komputer, mudah di guna.

Pengguna boleh berada dimana sahaja di

kawasan liputan.

Tiada had penggunaan IP, boleh

disambungkan kepada banyak komputer.

Kelemahan Penggunaan WIFI

●Jaringan perlahan apabila bilangan pengguna

talian tanpa wayar bertambah.

●Kos permulaannya agak tinggi.

●Orang lain boleh menggunakan talian tanpa

kebenaran (jika talian tidak disekat dengan

memasukkan “Network key” )

●Memerlukan penyelenggaraan individu yang cekap

Pekakasan tambahan untuk membantu

Teknologi Wireless

Pekakasan tambahan untuk membantu

Teknologi Wireless

Wireless Detector

Wireless Printer server

Poor-Man Wireless

Penggunaan barangan biasa untuk wifi