1. The card that connects a computer to a network is a:
- RAM
- graphics card
- NIC
- sound card
Answer: C) NIC
Explanation: Network Interface Card.
MCQs / Computer Science / Communication Modes, Protocols and Networks
Communication Modes, Protocols and Networks MCQs — Computer Science
44 multiple-choice questions on Communication Modes, Protocols and Networks from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. A bank connecting its branches across Pakistan uses a:
- LAN only
- MAN only
- WAN
- PAN
Answer: C) WAN
Explanation: Branches are spread over a large area.
3. A switch differs from a hub because a switch:
- works only wirelessly
- cannot connect computers
- sends data only to the intended device
- sends data to all devices
Answer: C) sends data only to the intended device
Explanation: Switches use MAC addresses to forward data.
4. In which topology are all devices connected to a single backbone cable?
- Ring
- Star
- Mesh
- Bus
Answer: D) Bus
Explanation: Bus uses one main cable with terminators.
5. Terminators are used at both ends of the cable in:
- star topology
- ring topology
- bus topology
- mesh topology
Answer: C) bus topology
Explanation: They stop signal reflection.
6. A device that regenerates weak signals to extend network distance is a:
- router
- printer
- modem
- repeater
Answer: D) repeater
Explanation: Repeaters boost signals.
7. VPN stands for:
- Video Protocol Network
- Very Personal Network
- Virtual Public Node
- Virtual Private Network
Answer: D) Virtual Private Network
Explanation: A VPN creates a secure tunnel over the Internet.
8. Arrange networks from smallest to largest coverage:
- WAN, MAN, LAN, PAN
- PAN, LAN, MAN, WAN
- LAN, PAN, WAN, MAN
- MAN, PAN, LAN, WAN
Answer: B) PAN, LAN, MAN, WAN
Explanation: Coverage increases in this order.
9. If the backbone cable is cut in a bus topology:
- only one computer fails
- speed increases
- the whole network fails
- the network becomes a ring
Answer: C) the whole network fails
Explanation: All devices share the backbone.
10. In TCP/IP, which part is responsible for addressing and routing packets?
- IP
- FTP
- HTML
- TCP
Answer: A) IP
Explanation: IP = Internet Protocol handles addressing and routing.
11. POP3 and IMAP are used to:
- send web pages
- transfer files only
- receive (retrieve) email
- connect printers
Answer: C) receive (retrieve) email
Explanation: They download/sync email from a server.
12. Which topology is most commonly used in modern office LANs?
- Full mesh
- Bus
- Star
- Ring
Answer: C) Star
Explanation: Ethernet switches form a star.
13. The physical or logical arrangement of devices in a network is called:
- bandwidth
- modem
- topology
- protocol
Answer: C) topology
Explanation: Topology = layout.
14. A device that connects networks using different protocols is a:
- keyboard
- repeater
- hub
- gateway
Answer: D) gateway
Explanation: Gateways translate between protocols.
15. Connecting your phone to wireless earbuds via Bluetooth forms a:
- PAN
- WAN
- MAN
- LAN
Answer: A) PAN
Explanation: Personal Area Network covers a few metres.
16. Which topology uses the least cable?
- Hybrid
- Mesh
- Star
- Bus
Answer: D) Bus
Explanation: Only one backbone cable is needed.
17. Which protocol is used to send email?
- POP3
- FTP
- SMTP
- HTTP
Answer: C) SMTP
Explanation: Simple Mail Transfer Protocol.
18. HTTPS differs from HTTP because it is:
- secure (encrypted)
- used only for email
- used for printing
- slower and older
Answer: A) secure (encrypted)
Explanation: HTTPS uses SSL/TLS encryption.
19. Which protocol automatically assigns IP addresses to devices?
- FTP
- DHCP
- SMTP
- DNS
Answer: B) DHCP
Explanation: Dynamic Host Configuration Protocol.
20. Which network type usually has the highest data speed and lowest error rate?
- Internet
- MAN
- WAN
- LAN
Answer: D) LAN
Explanation: LANs cover small areas with high-speed links.
21. A network inside a school computer lab is a:
- PAN
- MAN
- LAN
- WAN
Answer: C) LAN
Explanation: LAN covers a room, building or campus.
22. A mobile phone call is an example of:
- full duplex
- batch processing
- half duplex
- simplex
Answer: A) full duplex
Explanation: Both people can talk and listen at the same time.
23. Communication from a keyboard to the computer is:
- full duplex
- simplex
- mesh
- half duplex
Answer: B) simplex
Explanation: The keyboard only sends data.
24. Token passing is commonly associated with:
- ring topology
- bus topology
- star topology
- PAN
Answer: A) ring topology
Explanation: In a token ring, only the holder of the token sends data.
25. DNS translates:
- analog into digital
- domain names into IP addresses
- IP addresses into MAC addresses only
- text into images
Answer: B) domain names into IP addresses
Explanation: Domain Name System.
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