Week 6: Internet Infrastructure

Internet: A global connection of network or interconnected computer work by transmitting data through a special type of packet switching which is known as Internet Protocol (IP)

Internet Vs. WWW


Hierarchy of Network


single computer ⇨ LAN⇨ ISP⇨ WWW

Internet Protocol

• language of computer that computers use to communicate over the internet
• protocol is the pre-defined way that someone who wants to use a service talks with that service
• normally expressed in decimal format as a dotted decimal number

Hyper Text Transfer Protocol (HTTP)

• defines how messages are formatted and transmitted and what actions web servers and browsers should take in response to various command
• for example, when you enter a URL in a browser, this actually send HTTP command to the web server directing it to fetch and transmit the requested page 

Type of Internet Connection and Access

• Dial Connection - used with home computers
• Cable - used a direct connection (e.g: office)
• Satellite Internet Access - required transceiver satellite to receive and transmit data
• Fixed Wireless - used in radio transmission tower (same as satellite internet)
• Broadband - transmits data digitally, modem or similar device required to translate data packages
• Mobile Wireless - virtually anywhere cellular phone service available