Provides reliable connection oriented ransmission between two hosts. It guarantees delivery of packets between the hosts. 

(i) Network Access Layer - concerned with building packets. 
(ii) Internet Layer - describes how packets are to be delivered.
(iii) Transport Layer - ensure the proper transmission of data. 
(iv) Application Layer - application network processes. These processes include File Transfer Protocol (FTP), Hypertext Transfer Protocol, (HTTP), and Simple Mail Transfer Protocol (SMTP).

(i) DNS-Domain Name System
(ii) A method of referring to other host computers by using names rather than numbers.

(i)  A mobile network or cellular network as it is made up of a large number of signal areas called cells.
(ii) These cells join to form a large coverage area. Users can cross into different cells without losing their connection.

(i)  Internet Protocol (IP) is the principle of the communications protocol in the Internet protocols for layering on datagram across boundaries of other networks.
(ii)The main function is to allows Internet working and boost up the Internet.

i) HTTP - Hypertext Transfer Protocol
ii) HTTPS - Hypertext Transfer Protocol Secure
iii) FTP - File Transfer Protocol

(i) It provides mobility.
(ii) It provides connection to Internet.
(iii) Flexibility of LAN.
(iv) Ensures connectivity.
(v) Low cost, high benefits.

Intranet is a private network within an enterprise to share company data and computing resources between the employees. It may consist of many interlinked local area networks.

(i) HTTP: A protocol used between a web client and a web server protects non-secure data transmissions. The core protocol of the World Wide Web.
(ii) HTTPS: A protocol used between a web client and a web server permits secure data transmissions.
(iii) FTP: Used between computers for sending and receiving data. Enables a client to send and receive complete files from a server.

Main components of RFID system
1. RFID tag: It has silicon microchip attached to a small antenna and mounted on a substrate.
2. A reader: It has a scanner with antennas to transmit and receive signals, used for communication.
3. A controller: It is the host computer with a microprocessor which receives the reader input and process the data.

Comparision between Internet, intranet and Extranet

S.No	Internet	Intranet	Extranet
Meaning	Several Networks, small and big over the world, are connected together to form a Global network called the Internet.	Intranet is a website used by organizations to provide a place where employees can access company related information	Extranet is a private network using Internet technology to share part of business information with supplier's parthers and customers.
Applications	Download programs and files	Sharing of company policies/ rules and regulations	Online education/ training
Network accessibility	Public Access	Private Access	Private Access

No.	TCP/IP	OSI
1.	It is client server model. ie. when the client requests for service it is provided by the server.	It is conceptual model.
2.	It is standard protocol used for every network including the internet.	It is not a protocol but a reference model used for understanding and designing the system architecture.
3.	It is four layered model.	It has seven layers.
4.	TCP / IP follows vertical approach.	OSI model supports horizontal approach.
5.	It is Tangible	It is not Tangible
6.	It is follows top to bottom approach	It is follows a bottom-up approach

INTERNET:
(i) The Internet is a worldwide system of computer networks- A network of networks where the users at any one computer can get information from any other computer.
(ii) The Internet is a network of global connections - comprising private, public, business, academic and government networks connected by guided, wireless and fiber-optic technologies.
(iii) The unique aim was to generate a network that would permit users of a research computer from one university to "talk to" research computers on other universities.
(iv) The Internet denotes to the global communication system, including infrastructure and hardware, whereas the web is one of the services interconnected over the Internet.
INTRANET:
(i) Intranet is a private network within an enterprise to share company data and computing resources between the employees.
(ii) It may consist of many interlinked local area networks.
(iii) It includes connections through one or more gateway (connects two networks using different protocols together known as protocol convertor) computers to outside Internet.
EXTRANET: Extranet is a private network that uses Internet technology and the public telecommunication system to securely share business information with suppliers, vendors, partners, customers, or other business.

c) (A) is true and (R) is false.

a) Both (A) and (R) are correct and (R) is the correct explanation of (A)

c) (A) is true and (R) is false.

c) (A) is true and (R) is false.