sTaR tOpOlOgY

Star Topology
Star Topology is the most common type of network topology that is used in homes and offices. In the Star Topology there is a central connection point called the hub which is a computer hub or sometimes just a switch. In a Star Network the best advantage is when there is a failure in cable then only one computer might get affected and not the entire network.
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The Star Network Topology typically needs more cable to be networked than the usual Bus topology. A common cable that is used in Star Network is the UTP or the unshielded twisted pair cable. Another common cable that is used in star networks is the RJ45 or the Ethernet cables.
In a Star Network the entire network is dependant on the hub so if the entire network is not working then there could be a problem with the hub. This feature makes it easy to troubleshoot by offering a single point for error connection ad at the same time the dependency is also very high on that single point.
Star Topology Advantages
• A Star Network Topology is very easy to manage because of its simplicity in functionality.• The problems can be easily located logically in a Star Topology and therefore is easy to troubleshoot also.• The Star Topology is very simple in format so it is very easy to expand on the Star Topology.
Star Topology Disadvantages
• The Star Topology is fully dependant on the hub and the entire working of the network depends on the hub or the switch.• If there are many nodes and the cable is long then the network may slow down.
Since all the computers on the network have independent control of their networks and only dependant on the central hub computer, the failures in transmission and other possible problems in this area are less likely. Also if the hub is safe then every computer in the network is safe. This type of network also offers more privacy than any other network.
All the computers in the network are communicating with one main centrally located computer and there is no peer to peer coordination. If the peer to peer coordination takes place it is routed through the central hub. This way the privacy of each and every computer on the network is maintained.
If one computer fails in the network it does not affect any other computer in the network and the tasks of this computer can be easily switched very to the next computer easily using the hub controls. In a Star Network Topology it is possible to have all the important data back ups on the hub in a private folder and this way if the computer fails you can still use your data using the next computer in the network and accessing the backup files on the hub.
New devices or nodes can easily be added to the Star Network by just extending a cable from the hub. Since the hub controls everything the addition or removal of devices are done using g the hub. If the hub adds a device for example a printer or a fax machine, all the other computers on the network can access the new device by simply accessing the hub. The device need not be installed on all the computers in the network. The central function is cost effective and easier to maintain

Star Topology Conclusion
A Star Network Topology is best suited for smaller networks and works efficiently when there is limited number of nodes. One has to ensure that the hub or the central node is always working and extra security features should be added to the hub because it s the heart of the network.

Karnival ict Sabak Bernam 2010

Tarikh : 29-31 Oktober 2010
Tempat : Dewan Sri Bernam,45300 Sungai Besar
Masa : 8.30 pagi - 10.00 malam

Anjuran : Suruhanjaya Komunikasi Dan Multimedia Malaysia (SKMM)
: PPD Sabak Bernam
: PKG Daerah Sabak Bernam

Di lampirkan Tentatif Program bagi Karnival ICT Sabak Bernam 2010 sepanjang 3 hari dari 29-31 Oktober 2010

Tarikh	Masa	Aktiviti	Penyertaan
29.10.2010 (Jumaat)	8.30 pagi – 10.00 malam	Pameran dan jualan	Terbuka kepada pelajar dan umum serta pengunjung
	10.00 pagi	Perasmian	Pengetua, Guru Besar, Guru Media dan Guru Penyelaras Makmal Komputer.
	9.00 pagi – 11.00 pagi	Pendaftaran Penghakiman Pertandingan - Persembahan Interaktif Multimedia (P&P) Blog Klip Video Roket PC Assamble	Sekolah Menengah dan Sekolah Rendah
	3.00 petang – 6.00 petang	Mini Cyber Fusion	Terbuka kepada pelajar dan umum serta pengunjung
	8.00 malam – 10.00 malam	Cabutan Bertuah	Terbuka kepada pelajar dan umum serta pengunjung
30.10.2010 (Sabtu)	8.30 pagi - 10.00 malam	Pameran dan jualan	Terbuka kepada pelajar dan umum serta pengunjung
	9.00 pagi – 2.00 petang	Pertandingan - Explorace ICT Melukis Mewarna Mini Cyber Fusion	Terbuka kepada pelajar dan umum serta pengunjung Sekolah Menengah dan Sekolah Rendah Pra Sekolah Terbuka kepada pelajar dan umum serta pengunjung
	3.00 petang – 6.00 petang	Mini Cyber Fusion	Terbuka kepada pelajar dan umum serta pengunjung
	8.00 malam – 10.00 malam	Mini Cyber Fusion Cabutan Bertuah	Terbuka kepada pelajar dan umum serta pengunjung Terbuka kepada pelajar dan umum serta pengunjung
31.10.2010 (Ahad)	8.30 pagi – 5.00 petang	Pameran dan jualan bermula	Terbuka kepada pelajar dan umum serta pengunjung
	9.00 pagi – 2.00 petang	Final Battle Mini Cyber Fusion Cabutan Bertuah	Terbuka kepada pelajar dan umum serta pengunjung Terbuka kepada pelajar dan umum serta pengunjung
	3.30 petang	Penyampaian Hadiah
	4.30 petang	Persembahan tayangan video klip blog dan persembahan interaktif
	5.00 petang	Bersurai

differences between internet,intranet and extranet

internet is a network which is for public, world where intranet and extranet is a network for private use,
internet is a network where anybody can access, from around the world, but in intranet and extranet we add some privacy so only allowed people can access.

there is no need for example of internet, hope u know!!
lets give an example of intranet and extranet.
we sometimes login some websites which requires our details to login, such as bank to view our bank statement, isp, university, so here we r connecting to extranet, bank allow us to access their internal network. In intranet internal users are allowed to use, such staff of bank, isp or other company which allowed their internal staff to use their network and no outsiders allowed in this case.
hope it is alright!

Perbandingan antara topologi bus,ring,star

Topolgi bus

Tpologi jaringan bus meruapakan beberapa simpul/node dihubungkan dg jalur data (bus).topolgi ini menyediakan 1 saluran untuk komunikasisemua perangkat shgg setiap perangkat harus bergantian seluran tersebut.hanya ada 2perangkat yg saling berkomunikasi dalam 1 saat.tiap node dapat melakukan tugas-tugas dan operasi yg berbeda.Untuk mengifisiensi penggunaan jaringan digunukan metode CSMA/CD(Carrier Sense Multiplay Access/Collision Detected)yg mernguragi masa tenggang(saluran kosong)dg mendeteksi tabrakan informasi.
Keuntungan Topolgi Bus
1.Mengurangi kabel&jarak LAN tidak terbatas.
2.Biaya instalasi sgt murah.
3.Mudah untuk menambah atau mengurangkan kompuer &nod
Kekurangan Topologi Bus
1.Memerlukan terminator untuk kedua ujng kabel tulang belakang
2.Perlu pengulang (repeater0jika LAN jauh.
3.Jika kabel tulabg belakang (backbone)/mana-mana nodnya bermasalah rangkaian tidak dapat berfungsi.
Topologi Ring
Mempunyai satu titik kesalahan,terletak pd hub.jika pusat hub mengalami kegagalan,maka seluruh jaringan akan gagal beroperasi.Memerlukan alat pd central poin untuk membroadcast ulang atau pergantian traffic jaringan (switch network rraffic).Penempatan kabel yg diguib\nakan ring menggunakan desain yg sederhanh,pada topologi ring,setiap computer yg pertama.
Keuntungan Topologi Ring
1.Setiap computer hak akses yg sama terhadap token,sehingga tidak akan ada computer yg memonopoli jaringan.
2.Data yg mengalir dalam satu arah sehingga terjadinya collision dapat dihindarkan.
Kekurangan Topolgi ring
1.Apabila ada satu computer dlm ring yg gagal berfungsi,maka akan mempengaruhi keseluruhan jaringan.
2.Sulit mengatsi kerusakan di jaringan yg menggunakan topolgo ring.
3Menambah atau menguirangikomputer akan mengacaukaun jaringan.
Topologi Star
Dalam topologi star,semua kabel di hubungkan dr computer-computer ke lokasi pusat(central location),dimana semuanya rehubung ke suatu alat yg dinamakan hub
Keuntungan Topologi star
Cukup mudah untuk mengubah dan menambah computer kedalam jaringan yg menggunakan topologi star tanpa mengganggu aktivitas jaringan yg sedang berkangsung.Pusat dari jaringan star merupakan tempat yg baik untuk menentukan diagnosa kesalahan yg terjadi dalam jaringan.Kita dapat memakai beberapa tipe kabel didalam jaringan yg sama dg hub yg dapat mengakomodasi tipe kabel yg berbeda
Kekurangan Topologi star
Memepunyai satu titik kesalahan,terletak pd hub.Jika hub pusat mengalami kegagalan,maka seluruh jaringan akan gagal beroperasi.memerlukan alat pd central poin untuk membroadcast ulang ppergantian traffic jaringan (switch network traffic).
Topologi Mesh
Topologi Mesh adalah suatu bentuk hubungan antar perangkat,dimana perangkat terhubung secara langsung ke perangkat lainya yg ada didalam jaringan.Akibatnya,dalam topologi ini setiap perangkat dapat berlomunikasi langsung dgn parangkat yg dituju(dedicated links)
Keuntungan Topologi Mesh
Memiliki sifat Robust,yaitu apabila terjadi gangguan pada koneksi computer A dgn computer B karena ruasaknya kabel koneksi(links).Memudahkan proses identifikasi permasakahan pd saat terjadi kerusakan koneksi pd computer.
Kekurangan Topologi Mesh
Membutuhkan banyak kabel dan Port I/o.Semakin banyk computer didalam topologi mesh mk di[erlukan semakin banyak kabel links dan port I/O.Hal tersebut sekaligus jg mengindisikasikan bahwa topologi jenis ini membutuhkan biaya yg relative mahal.Karena setiap computer harus terkoneksi secara langsung dgn computer kainya mk instalasi dan konfigurasi menjadi sulit.

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