(a) Write the full forms of the following : (i) XML (ii) HTTPS (b) What is the use of FTP ?

Question

Q. (a) Write the full forms of the following :

(i) XML

(ii) HTTPS

(b) What is the use of FTP ?

CBSECBSE Class XII Board 2023Subjective· 2mImportance★★★★★

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Concept understanding — Computer Network Basics

Data Communication Basics

Think about what happens when you send a WhatsApp message to a friend. You type something, tap send, and within seconds it appears on their phone. That journey — from your device to theirs — is data communication. It is the transfer of information from one place to another using some medium, like wires, radio waves, or fibre-optic cables.

The NCERT textbook defines data communication as the exchange of data between two devices via some form of transmission medium. The key word is exchange — it is not one-way broadcasting; it is a deliberate transfer between a sender and a receiver.

The Four Pillars of Data Communication

For any data communication to work, four things must be in place:

Sender — the device that originates the message (your phone, laptop, or server).
Receiver — the device that gets the message (your friend's phone).
Medium — the physical path over which the message travels (copper wire, optical fibre, air for Wi-Fi).
Protocol — the set of rules that both sender and receiver agree to follow. Without a common protocol, the devices cannot understand each other — like two people speaking different languages.

Important

A protocol is not optional. It is the grammar of communication. HTTP, TCP/IP, and Bluetooth are all protocols. They define how data is formatted, how fast it can be sent, what to do if something goes wrong, and how to signal the end of a message.

Modes of Communication — How the Data Flows

The NCERT classifies data flow into three modes:

Simplex — data flows in only one direction. A television broadcast is simplex: the station sends, you receive. You cannot send anything back through the same channel.

Half-duplex — data flows in both directions, but only one direction at a time. A walkie-talkie works this way: you press to talk, release to listen. Both sides cannot speak simultaneously.

Full-duplex — data flows in both directions at the same time. A telephone call is full-duplex: you can speak and hear simultaneously. Most internet communication is also full-duplex.

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XML and HTTPS are both technologies used on the internet — XML structures data for sharing, while HTTPS secures the communication channel. FTP is a protocol for transferring files between computers on a network.

Let's begin with the context. When you study Computer Networks, you are essentially learning how computers talk to each other. Just like humans need a common language and rules for conversation, computers need protocols — agreed-upon sets of rules — to exchange information. The terms in your question are all examples of such protocols or technologies built on them.

Full Forms
1. XML stands for Extensible Markup Language. Think of it as a cousin of HTML, the language used to create web pages. While HTML is designed to display data (like making text bold or creating a table), XML is designed to describe and carry data. The word "Extensible" is key — it means you can create your own custom tags to define the structure of your data. For example, a school might use XML to store student records with tags like <name>, <rollno>, and <marks>. This makes it easy for different programs to read and exchange that data without confusion.
  Note
  
  XML is not a programming language; it is a markup language that focuses on the structure and meaning of data, not on how it looks.
2. HTTPS stands for HyperText Transfer Protocol Secure. This is the secure version of HTTP, the foundation of data communication on the World Wide Web. The "S" at the end stands for "Secure". When you visit a website using HTTPS, the data sent between your browser and the website's server is encrypted. This means that even if someone intercepts the data (like your password or credit card number), they cannot read it because it is scrambled. You can usually tell a website is using HTTPS when you see a padlock icon in your browser's address bar.
  Important
  
  HTTPS uses encryption protocols like SSL (Secure Sockets Layer) or TLS (Transport Layer Security) to create a secure, encrypted tunnel for data transfer. This is why you should always look for "https://" before entering sensitive information online.
Use of FTP FTP stands for File Transfer Protocol. …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2024Set 91/41 mark
$Q. Fill in the blank: ____ is a set of rules that needs to be followed by the communicating parties in order to have a successful and reliable data communication over a network.$
›Reveal solutionSolution
A protocol is the set of rules that communicating parties must follow for successful and reliable data communication over a network.

In the world of computer networks, communication is not as simple as two devices just sending signals to each other. Imagine two people trying to have a conversation — one speaks only Hindi, the other only Japanese, and they both talk at the same time. Nothing meaningful would get across. For data to travel from one computer to another and be understood correctly, both sides must agree on a common language and a set of procedures. This is where the concept of a protocol comes in.

A protocol is essentially a predefined set of rules and conventions that governs how data is exchanged between devices. It covers everything from how the data is formatted, how errors are detected and corrected, how the speed of transmission is managed, and how the communication starts and ends. Without protocols, even the most powerful computers would be unable to share information reliably.

Note

Think of a protocol like the rules of a game — say, cricket. Both teams must follow the same rules about bowling, batting, and scoring, or the game breaks down. Similarly, in networking, both the sender and receiver must follow the same protocol for the data exchange to succeed.

The NCERT textbook for Class 12 Computer Science (Chapter: Computer Networks) defines a protocol clearly. It states that a protocol is a set of rules that governs the communication between computers on a network. These rules ensure that data is sent, received, and interpreted correctly, regardless of the hardware or software differences between the devices.

Key aspects that a protocol typically handles include:

Syntax: The format or structure of the data — how bits and bytes are arranged.

Semantics: The meaning of each section of bits — what a particular pattern signifies (e.g., is it an address, a command, or actual data?). …
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Q.(a) Write the full forms of the following :

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