Protocol is a set of rules that allows two or more entities to communicate with each other. When two entities follow the same protocols (set of rules) they understand each other and exchange information. Protocol for two entities should be the same since they are many Protocols. The Protocol defines the rules on how the data is to be structured and how each side will receive it. OSI (Open Systems Interconnection) is the most important protocol which describes how a computer transfers packet by using different layers of protocol. The OSI consists of 7 Layers and works in a hierarchy. Each layer is layer is responsible for performing tasks and forwarding completed tasks to next layer for further processing. The process starts from the Physical layer and goes up till the Application layer. Following are some examples of different Protocols: -
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Every time a computer is connected to the network is automatically assigned an IP Address and the IP Address will change if the computer disconnects and reconnects again. This simplifies the network administration, enabling the network to automatically assign a value without the hassle of assigning a unique IP Address to the computer. Internet Providers use Dynamic IP Addressing for Internet subscribers.
Domain Name System (DNS): Domain Name System or DNS is an internet service which translates domain names into IP addresses. Each domain has a specific IP address. The internet basically is a directory of IP (Internet Protocol) addresses but the Domain makes it easier for people to understand and remember things, while it will hard to remember bunch of numbers but the computer does not understand domain names so DNS translates the domain name into its specific IP and then it is recognized by the computers.
Post Office Protocol