Networking Fundamental CBSE Class 12

Which protocol is responsible for assigning IP addresses dynamically to devices in a network?

In a classroom, Bhaskar is trying to connect his laptop to the school Wi-Fi, but he notices that his device is not getting an IP address. He asks his friend Myra for help.

• DNS

• SMTP

• DHCP

• IMAP

Answer explanation

The Dynamic Host Configuration Protocol (DHCP) is responsible for dynamically assigning IP addresses to devices in a network. In Avni's case, her laptop needs DHCP to obtain an IP address to connect to the school Wi-Fi.

Ayra is trying to understand the purpose of a ‘Modem’ in her home network setup. What is the purpose of a ‘Modem’?

• To connect two devices in a LAN

• To convert digital signals to analog and vice versa

• To amplify weak signals

• To route data packets

Answer explanation

The purpose of a modem is to convert digital signals from a computer into analog signals for transmission over phone lines and vice versa, enabling internet connectivity. This makes 'To convert digital signals to analog and vice versa' the correct choice.

What is the primary function of a ‘Router’ in a network?

During a group project, Akshaj is explaining to his classmates how data travels between different networks. He mentions the role of a router in this process.

• To connect devices within a single network

• To filter and forward data packets between networks

• To provide wireless connectivity

• To store data temporarily

Answer explanation

The primary function of a router is to filter and forward data packets between different networks, ensuring that data reaches its intended destination across various network paths.

Which device is used to extend the range of a Wi-Fi network?

In his home, Om notices that the Wi-Fi signal is weak in his bedroom. He considers using a device to improve the signal strength.

• Switch

• Repeater

• Hub

• Bridge

Answer explanation

A repeater is specifically designed to extend the range of a Wi-Fi network by receiving and amplifying the signal, making it the best choice for Priya to improve her bedroom's weak Wi-Fi signal.

What does the acronym ‘VPN’ stand for, and what is its primary use?

While discussing online security, Akshaj mentions a technology that allows users to create a secure connection over the internet.

• Virtual Private Network

• Virtual Public Network

• Variable Protocol Network

• Visual Private Network

Answer explanation

The acronym 'VPN' stands for 'Virtual Private Network'. It is primarily used to create a secure connection over the internet, protecting users' data and privacy while online.

What does the acronym ‘SSID’ stand for in wireless networking?

While setting up his home Wi-Fi, Aarav comes across a term that identifies his wireless network.

• Service Set Identifier

• Secure Signal Identifier

• Single Service Identifier

• System Set Identifier

Answer explanation

The acronym 'SSID' stands for 'Service Set Identifier', which is the term used to identify a specific wireless network. This is the correct choice among the options provided.

During a class project, Alisha and her friends are discussing the types of cables used in their school's wired LAN. Which type of cable is most commonly used?

• Fiber optic cable

• Coaxial cable

• Twisted-pair cable

• Wireless cable

Answer explanation

Twisted-pair cable is the most commonly used type in wired LANs due to its cost-effectiveness and sufficient bandwidth for most applications, making it the preferred choice over fiber optic and coaxial cables.

Which of the following is a characteristic of fiber optic cables?

• High bandwidth

• Low cost

• Low bandwidth

• Prone to interference

Answer explanation

Fiber optic cables are known for their high bandwidth capabilities, allowing them to transmit large amounts of data quickly. This makes them superior to traditional copper cables, which have lower bandwidth and are more prone to interference.

Prisha is curious about the internet and asks, What does DNS stand for?

• Digital Name System

• Domain Name Service

• Data Network System

• Domain Name System

Answer explanation

DNS stands for Domain Name System, which is the correct choice. It translates domain names into IP addresses, allowing users to access websites using easy-to-remember names instead of numerical addresses.

Vanya is studying networking and wants to know which of the following is correct about IPv4?

• IPv4 is a 32-bit addressing protocol used for network identification.

• IPv4 is a protocol for email communication.

• IPv4 is used exclusively for wireless networks.

• IPv4 is a 16-bit addressing protocol.

Answer explanation

The correct choice states that IPv4 is a 32-bit addressing protocol used for network identification. This is accurate, as IPv4 addresses are 32 bits long, allowing for over 4 billion unique addresses.