26. A device that connects a LAN to the Internet and chooses the best path for data is a:
- repeater
- NIC
- router
- hub
Answer: C) router
Explanation: Routers connect different networks using IP addresses.
MCQs / Computer Science / Communication Modes, Protocols and Networks
Communication Modes, Protocols and Networks MCQs — Computer Science (page 2)
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.
27. TV and radio broadcasting are examples of:
- simplex communication
- mesh topology
- full duplex
- half duplex
Answer: A) simplex communication
Explanation: Viewers cannot send data back on the same channel.
28. 192.168.1.10 is an example of a(n):
- MAC address
- email address
- IPv4 address
- URL
Answer: C) IPv4 address
Explanation: IPv4 uses four numbers separated by dots.
29. A walkie-talkie is an example of:
- full duplex
- satellite only
- half duplex
- simplex
Answer: C) half duplex
Explanation: Both can talk, but only one at a time.
30. Which mode makes the most efficient use of a two-way link?
- Simplex
- Full duplex
- Half duplex
- None
Answer: B) Full duplex
Explanation: Both directions are used all the time.
31. In a ring topology each device is connected to:
- every other device
- no other device
- exactly two neighbouring devices
- a central hub only
Answer: C) exactly two neighbouring devices
Explanation: Devices form a closed loop.
32. How many links are needed for a full mesh of 6 computers?
- 6
- 15
- 30
- 12
Answer: B) 15
Explanation: n(n−1)/2 = 6×5/2 = 15.
33. In which topology is every device connected to every other device?
- Ring
- Star
- Bus
- Mesh
Answer: D) Mesh
Explanation: Full mesh provides many paths.
34. Which protocol is used to transfer web pages?
- SMTP
- HTTP
- DHCP
- FTP
Answer: B) HTTP
Explanation: HyperText Transfer Protocol.
35. In which mode can both devices transmit and receive simultaneously?
- Simplex
- Full duplex
- Half duplex
- Asynchronous only
Answer: B) Full duplex
Explanation: Full duplex allows simultaneous two-way flow.
36. Which topology is the most reliable but also the most expensive?
- Star
- Bus
- Mesh
- Ring
Answer: C) Mesh
Explanation: Many redundant links increase cost.
37. The basic protocol suite of the Internet is:
- HTML
- TCP/IP
- SMTP only
- USB
Answer: B) TCP/IP
Explanation: TCP/IP governs Internet communication.
38. A combination of two or more topologies is called:
- simplex topology
- duplex topology
- hybrid topology
- single topology
Answer: C) hybrid topology
Explanation: e.g. tree = stars connected on a bus.
39. The largest WAN in the world is:
- the Internet
- a Bluetooth PAN
- a school LAN
- a city cable TV network
Answer: A) the Internet
Explanation: The Internet connects networks worldwide.
40. In simplex mode data flows:
- in one direction only
- in both directions at the same time
- in both directions, one at a time
- in no direction
Answer: A) in one direction only
Explanation: Simplex is one-way communication.
41. FTP is used for:
- sending email
- browsing web pages
- assigning IP addresses
- transferring files
Answer: D) transferring files
Explanation: File Transfer Protocol.
42. If the central switch fails in a star topology:
- nothing happens
- the whole network stops
- the network becomes a mesh
- only one computer stops
Answer: B) the whole network stops
Explanation: The switch is a single point of failure.
43. In which topology are all devices connected to a central switch or hub?
- Mesh
- Star
- Ring
- Bus
Answer: B) Star
Explanation: The hub/switch is the centre of the star.
44. A network covering a city is a:
- PAN
- LAN
- SAN
- MAN
Answer: D) MAN
Explanation: Metropolitan Area Network.
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