Internet and Intranet

RMUTT, 2008

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Course Outline

1st half– Internet overview– TCP/IP protocol– Applications in TCP/IP network

2nd half– JSP programming– Web Database in basic

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Text Book

Sams Teach Yourself TCP/IP in 24 Hours, Third Edition – Joe Casad

Publisher: Sams PublishingPub

Date: September 03, 2003

ISBN: 0-672-32565-9

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Hour 1. What Is TCP/IP

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What You'll Learn in This Hour:

Networks and network protocols History of TCP/IP Important features of TCP/IP

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At the completion of this hour, you'll be able to

Define the term network Explain what a network protocol suite is Explain what TCP/IP is Discuss the history of TCP/IP List some important features of TCP/IP Identify the organizations that oversee

TCP/IP and the Internet Explain what RFCs are and where to find

them

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Networks and Protocols

A network is a collection of computers or computer-like devices that can communicate across a common transmission medium

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A network protocol is a system of common rules that helps define the complex process of transferring data.

The data travels from an application on one computer, through the computer's network hardware, across the transmission medium to the correct destination, and up through the destination computer's network hardware to a receiving application.

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Comparing of TCP/IP model and OSI Model

TCP UDP

Telnet SMTP FTP DNS SNMP NTP

IP

Ethernet 802.11

Frame Relay ATM

ARPICMPIGMP

OSI Model TCP/IP Model Protocols in each layer

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TCP/IP and its related protocols form a complete system defining how data should be processed, transmitted, and received on a TCP/IP network, We call TCP/IP and related protocols is Protocol Suite.

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The actual act of formatting and processing TCP/IP transmissions is performed by vendor's implementation of TCP/IP. – For example Microsoft TCP/IP

Must be aware of the following distinction.– A TCP/IP standard is a system of rules defining

communication on TCP/IP networks.– A TCP/IP implementation is a software component

that performs the functions and services that enable a computer to participate in a TCP/IP network.

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The Development of TCP/IP

TCP/IP networking represents the synthesis of two developments – The Internet– The local area network (Intranet)

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The Internet

The Internet grew from research originally performed by the United States Department of Defense.

In the late 1960s Defense Department officials began to notice that the military was accumulating a large and diverse collection of computers that use proprietary protocols.

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Proprietary is controlled by a private entity.

Defense officials began to – share information

• considerations of security• decentralized

– ARPAnet• network with no failure points • The protocol that supported this

interconnectable know as TCP/IP.

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A few years later– National Science Foundation wanted to

build a network to connect research institutions, it adopted ARPAnet's protocol to build the Internet

Two important features of TCP/IP – End node verification (No central oversee)– Dynamic routing

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The Local Area Network (LAN)

LANs developed along with the computer industry and were a response to the need for offices to share computer resources– Early LAN protocols did not provide

Internet access – As the Internet became more popular, LAN

provide complete support for TCP/IP.

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LAN Network Topology

RingStar

Bus

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TCP/IP Features

Logical addressing Routing Name service Error control and flow control Application support

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Logical Addressing

A logical address is an address configured through the network software. In TCP/IP, a computer's logical address is called an IP address.

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Routing

A router is a special device that can read logical addressing information and direct data across the network to its destination.

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Name Resolution People might have trouble remembering

whether a computer's address is 111.121.131.146 or 111.121.131.156.

Name resolution is mapping of domain names to an IP address.

TCP/IP's name service system provides for a hierarchy of name servers that supply domain name/IP address mappings for DNS-registered computers on the network.

Another common name resolution scheme is the Windows Internet Name Services (WINS)

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Error Control and Flow Control

Checking data – to ensure that the data that arrives is exactl

y what was sent. TCP/IP's Transport layer defines many

of these error-checking, flow-control, and acknowledgment functions.

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Application Support

TCP/IP interface from the network to the applications is accomplished through a system of logical channels called ports.

Each port has a number that is used to identify the port.

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Standards Organizations and RFCs

Several organizations have been instrumental in the development of TCP/IP and the Internet.– Internet Advisory Board (IAB)– Internet Engineering Task Force (IETF) – Internet Research Task Force (IRTF) – Internet Corporation for Assigned Names and

Numbers (ICANN) – InterNIC

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Homework 1

What is the responsibilities of organization from previous slide?

What is RFCs and related document?

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