What is IP address and their Types

What is IP address?

The Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the Internet. Each computer (known as a host) on the Internet has at least one IP address that uniquely identifies it from all other computers on the Internet.

When you send or receive data (for example, an e-mail note or a Web page), the message gets divided into little chunks called packets. Each of these packets contains both the sender's Internet address and the receiver's address. Any packet is sent first to a gateway computer that understands a small part of the Internet. The gateway computer reads the destination address and forwards the packet to an adjacent gateway that in turn reads the destination address and so forth across the Internet until one gateway recognizes the packet as belonging to a computer within its immediate neighborhood or domain. That gateway then forwards the packet directly to the computer whose address is specified.

Because a message is divided into a number of packets, each packet can, if necessary, be sent by a different route across the Internet. Packets can arrive in a different order than the order they were sent in. The Internet Protocol just delivers them. It's up to another protocol, the Transmission Control Protocol (TCP) to put them back in the right order.

Question for IP Address

Question for IP Address


1.  What is IP address?


IP address is short for Internet Protocol Address. An IP Address is a unique number that devices use in order to identify and communicate with each other on a computer network.  If two computers have the same IP addresses, it will cause conflict and cause problem.

IP Addresses are written as a sequence of four numbers separated by ".", like this: 208.123.246.35.

2.  What is Public IP address? What is Private IP address?
Public IP addresses are IP addresses used on Internet. They are internet route-able and are visible to the public. Most people who use Cable/DSL service at home/office obtain one dynamic Public IP address from ISP (Internet Service Provider).

Computers on a Local Area Network use Private IP addresses. 192.168.x.x is an example of a Private IP address.

3.  What is the purpose of a broadband router?
The purpose of a broadband router is to share an internet connection among several computers.  The broadband router will get one public IP from your ISP and assign dynamic private IP address to each of your computer.  All of your computers will have unique private IP address but will use the same public IP address to browse Internet.  The router provides a basic Firewall which can deny access to your local computers from Internet.

What is CLIENT-SERVER ?

What is CLIENT-SERVER ?

The term client-server refers to a popular model for computer networking that utilizes client and server devices each designed for specific purposes. The client-server model can be used on the Internet as well as local area networks (LANs). Examples of client-server systems on the Internet include Web browsers and Web servers, FTP clients and servers, and the DNS.
Client and Server Devices
Client/server networking grew in popularity many years ago as personal computers (PCs) became the common alternative to older mainframe computers. Client devices are typically PCs with network software applications installed that request and receive information over the network. Mobile devices as well as desktop computers can both function as clients.

A server device typically stores files and databases including more complex applications like Web sites. Server devices often feature higher-powered central processors, more memory, and larger disk drives than clients.
Client-Server Applications
The client-server model distinguishes between applications as well as devices. Network clients make requests to a server by sending messages, and servers respond to their clients by acting on each request and returning results. One server generally supports numerous clients, and multiple servers can be networked together in a pool to handle the increased processing load as the number of clients grows.

What is Network Security?

         

WHAT IS NETWORK SECURITY?

The networks are computer networks, both public and private, that are used every day to conduct transactions and communications among businesses, government agencies and individuals. The networks are comprised of "nodes", which are "client" terminals (individual user PCs) and one or more "servers" and/or "host" computers. They are linked by communication systems, some of which might be private, such as within a company, and others which might be open to public access. The obvious example of a network system that is open to public access is the Internet, but many private networks also utilize publicly-accessible communications. Today, most companies' host computers can be accessed by their employees whether in their offices over a private communications network, or from their homes or hotel rooms while on the road through normal telephone lines.

Network security involves all activities that organizations, enterprises, and institutions undertake to protect the value and ongoing usability of assets and the integrity and continuity of operations. An effective network security strategy requires identifying threats and then choosing the most effective set of tools to combat them.