8th entry

Assalamualaikum
today is the last week of our class, so that's mean that no more post after this :( it is true??
I'am not sure actually hehe....
so today we learn about

INTERNET INFRASTRUCTURE

*hierarchy of network

• from a single computer to LAN
• from LAN to ISP
• from ISP to WWW

*in order to connect yourself, you need

• computer
• web browser
• internet acces

--however the policy is quite complicated

INTERNET PROTOCOL (IP)

• internet standard protocol that provide a common layer over dissimilar network
• to move packet among 'host' computer through gateways
• every computer assign unique IP address
• IP address consist of 32 bits (shows as 4 octets of number from 0-225 represented in decimal form instead of binary)

        1 octet = 8 bits
        4 octet = 32 bits
        1 IP     = 32 bits

• IP address consist of 2 parts:

1.  identify the networks
2. identify the node/host

• class of address determines which parts belongs to the networks address and which part belongs to node.
• all node on a given network share the same network prefixes but must have a unique host number

CLASS 'A' NETWORK

• binary address start with 0
• decimal no. are from 2 to 126
• the first 8 bits (the first octets) identify the networks and the remaining 24 bits indicate the host within the network
• exp:  102.168.212.226

CLASS 'B' NETWORK

• binary address starts with 10
• decimal no. are from 128 to 191
• the no. 127 is reserved for loopback and is used for internal testing for local machine
• the first 16 bits (first 2 octets) identify the networks and the remaining 16 bits indicate the host
• exp: 168.212. 226.204

CLASS 'C' NETWORK

• binary address starts with 110
• decimal no. are from 192 to 223
• the first 24 bits (first 3 octets)  identify the networks
• 200.168.212.226

CLASS 'D' NETWORK

• binary address starts with 1110
• decimal no. are from 224 to 239
• used to support multicasting

 CLASS 'E' NETWORK

• binary address starts 1111
• decimal no. are from240 to 254
• used for experimentation

 DOMAIN NAME SYSTEM (DNS)

• internet service that translate domain names likes www.yahoo.com into numerical IP address likes 204.62.131.129
• it more easy to remember

INTERNET SERVICE PROVIDER (ISP)

• is a company that offer its customer access to the internet
• connects to its customer using a data transmission technology 
• may provide Internet e-mail accounts to user which allow them to communicate with one another by sending and receiving electronic messages through their ISPs' server.

 WHAT IS HTTP?

• HTTP stand for Hypertext Transfer Protocol
• set of rule for transferring files such as text, graphic images, sound, video and other multimedia files on the World Wide Web (WWW)
•  HTTP is an aplication protocol that runs on top of the TCP/IP suite of protocols (the foundation protocols for the internet)

bye2 that's all for today
see yaa (^-^)