Sunday, February 8, 2009

Today : Fiber Optik

Perkara yang berkaitan dengan pemilihan jenis fiber optik :-

  • indoor / outdoor
  • multimode / single mode
  • connector type
  • ammor @ not
  • length
  • speed
  1. indoor/outdoor
  • jenis yang sesuai untuk indoor/outdoor boleh pakai wayer lembut atau keras.
  1. multimode/singlemode

  1. connector type
  • ST (simply twise) penyambung bulat
  • SC (simply click)
  • MTRJ
  1. ammor atau tidak
  2. length
  3. speed

Thursday, February 5, 2009

Today : TCP/IP

Transmission Control Protocol/Internet Protocol (TCP/IP) adalah protokol yang diterima pakai untuk kegunaan WAN, LAN dan Internet.

Wednesday, February 4, 2009

Today : DNS

DNS (Domain Name System)

Intro :
  • DNS is a hierarchical naming system for computers, services, or any resource participating in the Internet.
  • It associates various information with domain names assigned to such participants. Most importantly, it translates domain names meaningful to humans into the numerical (binary) identifiers associated with networking equipment for the purpose of locating and addressing these devices world-wide.
  • For example, translates to
  • Domain name services resolves names to the ipaddresses of clients and vice verse. Domain name system provides a convenient way of finding computer systems in network based on its name and ip address . With increased internet usage and globalization of companies setting up of dns servers has become a major responsibility of system administarators worldwide
  • Domain name system is a hierarchical system where we have a top level domain serving sub domain and clients with names & ip address
  • The system that runs the name services to resolve names into ipaddresses is called name server and the sofware is generally BIND (Berkley Internet Domain)
  • Each of domain or sub domain have information about its clients and is called authorative for these clients. For other clients for which it doesn't have any information or it is not authorative, it passes query to its higher domain
DNS (Sistem Penamaan Domain)

Intro :
  • Sistem yang simpan maklumat tentang nama host/nama domain dalam bentuk pengagihan database (distributed database)
  • Distributed database tadi digunakan untuk pencarian nama komputer di dalam internet yang menggunakan TCP/IP
  • Sediakan alamat IP untuk setiap nama host dan merekodkan setiap "mail exchange server" yang menerima email untuk setiap domain.
  • cth: web browser/emal yang diterjemahkan kpd sebuah domain ke alamat IP. boleh juga dibaca sebagai
Fungsi DNS:
  • Terjemahkana nama komputer ke alamat IP

network security

kismec test