Internet internally follows number based addressing system. Numeric address of a computer is called IP address by a scheme called Domain Name System (DNS). The IP address consists of four numbers from 0 to 255, separated by dots.

The characteristics of an IP address are as follows:

IP addresses are unique.
IP addresses are global and standardised.

Question - 22 : - How do you differentiate between a Web address and an E-mail address?

Answer - 22 : -

The basic differences between a Web address and an E-mail address are as follows:

E-mail address is a network address whereas Web address is the Internet address.
An E-mail address always contains the ‘at the rate’ sign (@) whereas, a Web address never does.

Question - 23 : - What is the significance of HTTP?

Answer - 23 : - HTTP is a protocol used on Internet. It works in combination with WWW. It allows us to access hypertext documents on WWW. Since, WWW allows us to access or use multimedia files on the Internet and the hypertext files support multimedia.

Question - 24 : - Why is Internet called ‘Network of Networks’?

Answer - 24 : -

Internet is called ‘Network of Networks’ because it is global network of computers that are linked together by cables and telephone lines making communication possible among them. It can be defined as a global network over a million of smaller heterogeneous computer networks.
The network which consists of thousands of networks spanning the entire globe is known as Internet.
The Internet is a world wide collection of networked computers, which are able to exchange information with each other very quickly.
Mostly people use the Internet in two ways, E-mail and World Wide Web. In Internet, most computers are not connected directly, they are connected to smaller networks, which in turn are connected through gateways to the Internet backbone.
A gateway is a device that connects dissimilar networks. A backbone is central interconnecting structure that connects one or more networks.

Question - 25 : - What is DNS and also explain its functions?

Answer - 25 : -

DNS stands for Domain Name System. It is a hierarchical distributed naming system for computers, services or any resources connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities.

The different functions of DNS are as follows:

It translates meaningful domain names into the numerical IP addresses, which is needed for the purpose of locating computer services and devices world wide.
It serves as the phone book for the Internet by translating human friendly computer host names into IP addresses.
The DNS can be quickly updated, allowing a service’s location on the network to change without affecting the end users.
It distributes the responsibility of assigning domain names and mapping those names to IP addresses by designating authoritative names servers for each domain.
It also specifies the technical functionality of database service. It defines the DNS protocol, a detailed specification of the data structure and data communication exchanges used in DNS, as part of the Internet Protocol Suite (IPS).

Question - 26 : - Give an example of E-mail address and explain each part of it.

Answer - 26 : -

The example of an E-mail address is abc@gmail.com.

The format of E-mail address is username@hostname or domain name. So, as per the above example of E-mail address abc is the username and gmail.com is the name of hosting server or host (domain) name. Thus, we can say that E-mail address has two parts separated by symbol.

Username: On the left side of separator @ is the user name. A user name cannot have blanks.
Domain name for the host server: The portion to the right of @ identifies the server or host network that services your E-mail. It is also known as E-mail server.

Question - 27 : - Read the following paragraph. Find six network and communication related abbreviations and give their expanded form alongwith a single-line definition of each of them.

Answer - 27 : -

Six network and communication related abbreviations are as follows:

TCP (Transmission Control Protocol) A protocol developed for the Internet to get information from one network device to another.
HTTP (HyperText Transfer Protocol) A protocol that transmits hypertext over networks. This is the protocol of the Web.
ISP (Internet Service Provider) An organisation that provides access to the Internet through various connectivity methods.
IIS (Internet Information Server) It is a Microsoft proprietary Web server software.
SMTP (Simple Mail Transfer Protocol) It distributes E-mail messages and attached files to one or more electronic mail boxes.
ADSL (Asymmetrical Digital Subscriber Line) A data communication technology that enables faster data transmission over copper telephone lines than a conventional voice band modem can provide.

Question - 28 : -
The following sentences describe the term Web browser.
Web browsers are programs used to explore the (1) ………… . A Web browser is an interface that helps a computer user gain access to all the content that is on the Internet and the hard disk of the computer. It can view (2) …………, text documents, audio and video files, games etc. More than one (3) …………. can also be installed on a single computer. The user can navigate through files, folders and (4) ………… with the help of a browser. When the browser is used for browsing (5) …………, the pages may contain certain links which can be opened in a new browser. Multiple tabs and windows of the same browser can also be opened. An example of Web browser is (6) ……….. .

Answer - 28 : -

Internet
Images
Web browser
Websites
Web pages
Google Chrome

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