QBASIC Programming Solutions and SLC / SEE Computer Science Questions Solved Along PYTHON

IP Address: Unique address assigned to a computer on a network.
Default Gateway: Address of the router used to communicate with other networks and the Internet.

Activity 1.2: Demonstrate the Use of ping, ipconfig, tracert, and nslookup Commands

1. ping Command

Purpose

Tests network connectivity between two devices.

Command

ping google.com

Use

Checks whether a website or device is reachable.
Measures response time.

2. ipconfig Command

Purpose

Displays network configuration information.

Command

ipconfig

Use

Displays IP Address.
Displays Subnet Mask.
Displays Default Gateway.

3. tracert Command

Purpose

Shows the route taken by data packets to reach a destination.

Command

tracert google.com

Use

Identifies network routes.
Helps troubleshoot network issues.

4. nslookup Command

Purpose

Finds the IP address of a domain name.

Command

nslookup google.com

Use

Checks DNS functionality.
Converts domain names into IP addresses.

Conclusion

These commands are useful for network troubleshooting and configuration checking.

Activity 1.3: Demonstrate RJ45 and Fiber Connectors

i. RJ45 Connector

Identification

Small plastic connector with 8 metal pins.
Used with Ethernet cables (CAT5e/CAT6).

Purpose

Connects computers, switches, and routers in a LAN.
Transmits data using electrical signals.

ii. Fiber Optic Connectors

Types

SC (Subscriber Connector)
LC (Lucent Connector)
ST (Straight Tip)

Purpose

Used in fiber optic cables.
Transmits data using light signals.

iii. Difference Between RJ45 and Fiber Connectors

RJ45 Connector	Fiber Connector
Uses copper cable	Uses fiber optic cable
Uses electrical signals	Uses light signals
Lower speed	Higher speed
Short distance	Long distance

iv. RJ45 Crimping Process

Strip the cable jacket.
Arrange wires according to standard color codes.
Insert wires into the RJ45 connector.
Crimp using a crimping tool.
Connect the cable to a network port.

v. Advantages of Fiber Optics

High speed
Long-distance communication
High bandwidth
Low signal loss
Immune to electromagnetic interference

vi. Typical Uses

RJ45

Local Area Networks (LANs)
Offices
Schools
Homes

Fiber Optic Connectors

ISP networks
Data centers
Telecommunications
Backbone networks

Conclusion

RJ45 connectors are used in Ethernet networks, while fiber connectors are used for high-speed and long-distance communication.

Activity 1.4: Demonstrate and Identify Devices and Cables

A. Networking Devices

1. Router

Function: Connects different networks and provides Internet access.

2. Switch

Function: Connects multiple devices in a LAN and forwards data to the correct destination.

3. Hub

Function: Connects multiple devices and broadcasts data to all connected devices.

4. Modem

Function: Connects a computer network to an Internet Service Provider (ISP).

5. Access Point

Function: Provides wireless (Wi-Fi) connectivity to devices.

B. Network Cables

1. UTP (Unshielded Twisted Pair) Cable

Use: Commonly used in LANs with RJ45 connectors.

2. Fiber Optic Cable

Use: High-speed and long-distance communication using light signals.

3. Coaxial Cable

Use: Cable television and broadband Internet connections.

Observation Table

Device/Cable	Function
Router	Connects networks and provides Internet access
Switch	Connects devices in a LAN
Hub	Broadcasts data to all devices
Modem	Connects network to ISP
Access Point	Provides wireless connectivity
UTP Cable	Transfers data through copper wires
Fiber Optic Cable	Transfers data through light signals
Coaxial Cable	Used for cable TV and broadband Internet

Conclusion

Networking devices and cables work together to establish communication and data transfer within a computer network.

1.9 Concept of internet, intranet and extranet

Internet

The Internet is a worldwide network of interconnected computers and devices that allows people to communicate, share information, and access various online services.

It uses TCP/IP protocols to transfer data between devices through wired or wireless connections.

Features of the Internet

i. Global network connecting millions of devices
ii. Supports communication and information sharing
iii. Uses TCP/IP protocols for data transmission
iv. Provides access to various online services

Services of the Internet

Web Browsing
E-mail
Social Media
Online Shopping
Video Streaming
Online Gaming

Uses of the Internet

Communication
Education and Learning
Business and Banking
Entertainment
Information Sharing

Intranet

An Intranet is a private network used within an organization to share information, communicate, and collaborate among authorized users.

Unlike the Internet, an intranet is accessible only to members of the organization.

It uses Internet technologies such as TCP/IP, HTTP, and HTML to provide services within the organization.

Features of Intranet

i. Private network within an organization
ii. Accessible only to authorized users
iii. Improves communication and collaboration
iv. Uses Internet technologies such as TCP/IP, HTTP, and HTML
v. Provides secure access to organizational resources

Services of Intranet

Internal E-mail
File Sharing
Internal Websites
Online Collaboration
Information Sharing

Uses of Intranet

Employee communication
Sharing documents and resources
Accessing company information
Improving productivity

Extranet

An Extranet is a private network that allows an organization to share information and resources with authorized external users such as customers, suppliers, and business partners.

It provides controlled and secure access to selected users outside the organization using Internet technologies.

Features of Extranet

i. Extends the intranet to external users
ii. Provides secure communication and collaboration
iii. Allows access to authorized users only
iv. Uses Internet technologies for connectivity
v. Supports information sharing with business partners

Uses of Extranet

Communication with customers
Collaboration with suppliers
Sharing business information
Managing business partnerships

Examples of Extranet

Supplier Management System
Online Customer Portal
Business Partner Network

Difference Between Internet, Intranet, and Extranet

Basis	Internet	Intranet	Extranet
Meaning	Global public network	Private network within an organization	Private network for authorized external users
Users	Anyone can access	Employees of the organization	Employees and authorized external users
Access	Public	Restricted	Limited and controlled
Purpose	Worldwide communication and information sharing	Internal communication and resource sharing	Information sharing with partners, suppliers, and customers
Security	Less secure	More secure	Secure with controlled access
Examples	Google, Facebook, YouTube	School/Company Internal Portal	Customer Portal, Supplier Portal

Differentiate between Internet, Intranet, and Extranet.

Answer:

Internet is a public network, whereas Intranet and Extranet are private networks.
Internet is accessible to everyone, whereas Intranet is accessible only to employees.
Extranet allows access to authorized external users such as customers and business partners.
Intranet is used for internal communication, whereas Extranet is used for communication with external partners.

1.8 Concept of IP addressing (IPv4 and IPv6)

1.8 Concept of IP Addressing

Internet Protocol (IP) is a protocol that provides a unique address to each device connected to a network and helps deliver data to the correct destination.

An IP address is a unique numerical address assigned to a device for identification and communication on a network.

IP ensures that data sent from one device reaches the intended destination.

Versions of IP Address

i. IPv4 (Internet Protocol Version 4)
ii. IPv6 (Internet Protocol Version 6)

IPv4 (Internet Protocol Version 4)

IPv4 (Internet Protocol Version 4) is the fourth version of the Internet Protocol and is widely used for communication on the Internet.

It uses a 32-bit address system, which allows approximately 4.3 billion unique IP addresses.

An IPv4 address is written in dotted-decimal format, consisting of four numbers separated by periods.

Example of IPv4 Address

192.168.1.1

Features of IPv4

i. Uses 32-bit addresses
ii. Provides approximately 4.3 billion unique addresses
iii. Uses dotted-decimal notation
iv. Widely used on the Internet

Limitation of IPv4

The number of available IPv4 addresses is limited, which led to the development of IPv6.

IPv6 (Internet Protocol Version 6)

IPv6 (Internet Protocol Version 6) is the latest version of the Internet Protocol. It was developed to overcome the limitations of IPv4, especially the shortage of IP addresses.

IPv6 uses a 128-bit address system, which provides a very large number of unique IP addresses.

IPv6 addresses are written in hexadecimal format and are separated by colons (:).

Example of IPv6 Address

2001:0db8:85a3:0000:0000:8a2e:0370:7334

Features of IPv6

i. Uses 128-bit addresses
ii. Provides a much larger address space than IPv4
iii. Uses hexadecimal notation
iv. Offers better security and performance
v. Supports a large number of Internet-connected devices

Advantages of IPv6

Large number of IP addresses
Better security
Improved network efficiency
Supports future Internet growth

Difference Between IPv4 and IPv6

IPv4	IPv6
Uses 32-bit addresses	Uses 128-bit addresses
Provides about 4.3 billion addresses	Provides a very large number of addresses
Uses decimal notation	Uses hexadecimal notation
Address is separated by dots (.)	Address is separated by colons (:)
Example: 192.168.1.1	Example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334
Limited address space	Very large address space
Less secure	More secure
Older version	Newer version

Network Protocols

Network Protocols

A network protocol is a set of rules that governs communication and data exchange between computers and devices in a network.

Protocols ensure that data is sent, received, and understood correctly.

Common Network Protocols

1. TCP/IP (Transmission Control Protocol / Internet Protocol)

TCP/IP is the main protocol used for communication on the Internet.

2. HTTP (Hyper Text Transfer Protocol)

HTTP is used to transfer web pages and HTML documents on the World Wide Web (WWW).

3. HTTPS (Hyper Text Transfer Protocol Secure)

HTTPS is a secure version of HTTP that protects data exchanged between users and websites.

4. DHCP (Dynamic Host Configuration Protocol)

DHCP automatically assigns IP addresses to devices on a network.

5. SMTP (Simple Mail Transfer Protocol)

SMTP is used for sending e-mails.

6. FTP (File Transfer Protocol)

FTP is used for transferring files between computers.

Protocol	Full Form	Use
TCP/IP	Transmission Control Protocol / Internet Protocol	Internet Communication
HTTP	Hyper Text Transfer Protocol	Web Pages
HTTPS	Hyper Text Transfer Protocol Secure	Secure Websites
DHCP	Dynamic Host Configuration Protocol	Automatic IP Address Assignment
SMTP	Simple Mail Transfer Protocol	Sending E-mails
FTP	File Transfer Protocol	File Transfer