My Day & About Computer Network

Assalamualaikum , alhamdulillah masih diberikan umur yang panjang dan bernafas sehingga saat ini untuk saya menulis sambungan blog . 

 Hari ini kakak nak cerita sikit , sudah seminggu tahan sakit gigi . Arghh , teramat-amat sakit sampai tak boleh nak belajar dan tido . Kawan-kawan buat lawak pun tak boleh nak ketawa , tapi bila dah tak tahan sangat ketawa jugak akhirnya . OK now , berdenyut-denyut sampai seluruh muka dan kepala , huauhuaaa kakak mampu bertahan saja rasa sakit ini . Nak menangiskan rasa macam budak-budak pulak . maklumlah kita nie kan dah besar , tunjuklah sikit kematangan dan kakak sado . Hihihi . 

By the way , hari ini kakak boleh balik , yeayy happy sangat . Bas pukul 9.00 malam sorang diri pulak tu , haishhh takut juga sebenarnya . Mama bukan main lagi berleter sebab takut anak dia terjadi apa-apa . InshaAllah tak ada apa-apa . Doakan ye . Pasal sakit gigi ni pun tolong doa ya . 

Kakak kena tabah duduk sini . Bila difikirkan balik macam-macam ujian Allah turunkan sepanjang duduk dekat sini . Kakak tahu ujian itu lebih mematangkan kita dan menjadikan kita ini lebih kuat . I'm Right? 

Jom kita belajar sikit harini :)

What is a Network?

A network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

What Is Communication Device?

A communications device is any type of hardware capable of tansmitting data , instructions and information between a sending device and a receiving device .

Type Of Communication Device .

•Dial-up Modem

•Digital modem(ISDN, DSL and Cable Modem)

•Wireless modem

•Network card

•Wireless access point

•Router

•Switch

•Hub

Dial-up Modem 

	A communications device that can convert digital signals to analog signals and analog signals to digital signals, so that data can travel along an analog telephone line.  Digital Modem (ISDN,DSL, Cable Modem)
	A communications device that sends and receives data and information to and from a digital line.      Wireless Modem
	Some mobile users have a wireless modem that uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device.

WHAT IS transmission media?

Materials or substances capable of carrying one or more signals in a communications channel.

Two types of transmission media:

1.Physical transmission media/Guided media/Wired

•Twisted-Pair Cable, Coaxial Cable, Fiber-Optic Cable.

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2.Wireless transmission media/Unguided media/ Wireless

•Infrared, Broadcast Radio, Cellular Radio, Microwave, communications satellite.

Advantages of Network : 

• Easy Communication and Speed
• People can communicate efficiently by using a network such as emails, instant messaging, telephony, video conferencing, chat rooms, etc.
• Ability to Share Files, Data and Information

o   It can benefit large organizations to maintain their data in an organized manner and facilitate access for desired people

• Sharing Hardware

o   By sharing hardware it can reduce the cost of purchasing hardware because there’s              no need to have individual  hardware such as printer for each and every computer in the company.

·         Sharing Software

• It can reduce the cost of buying software by networking their computers because networkable versions of software are available.
• Security

o   Sensitive files and programs on a network can be password protected and can only be accessed by the authorized users.

• Speed

o   Sharing and transferring files within networks is very rapid, depending on the type of network.

o   This will save time while maintaining the integrity of files.

               Disadvantages of Network :

• Breakdowns and Possible Loss of Resources

o   Breakdown of the whole network due to an issue of the server may lead to loss of important data of the server.

• ·         Expensive to Build

o   Building a network  for large scale organizations are very pricey especially to buy and replace cables and other hardware .

• Security Threats

o   There are hackers who are trying to steal valuable data of large companies for their own benefit.

• ·         Bandwidth Issues

o   Heavy users who consume a lot more bandwidth will affect other users.