Chapter-10 Computer Networks — Online MCQ Test
COMPUTER SCIENCE · Grade 12 · CBSE(NCERT)
Practice Chapter-10 Computer Networks with a free chapter-wise online MCQ test.
This chapter covers: network topologies - star topology - bus topology - tree topology - transmission media - twisted pair - optical fiber - radio waves - hubs - switches - routers - gateways.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-10 Computer Networks — Important Questions & Answers
Which network topology connects all devices to a central device?
- A. Star topology
- B. Bus topology
- C. Tree topology
- D. Ring topology
Answer: A. Star topology
Star topology has all computers connected to a central hub or switch, making it the defining characteristic of this topology.
Star topology has all computers connected to a central hub or switch, making it the defining characteristic of this topology.
In a bus topology, all devices are connected to a single ___________.
- A. Hub
- B. Central cable or backbone
- C. Router
- D. Gateway
Answer: B. Central cable or backbone
Bus topology uses a single shared communication line (backbone cable) to which all devices connect directly.
Bus topology uses a single shared communication line (backbone cable) to which all devices connect directly.
Which transmission medium uses light pulses to transmit data?
- A. Twisted pair
- B. Coaxial cable
- C. Optical fiber
- D. Radio waves
Answer: C. Optical fiber
Optical fiber transmits data as light signals through a glass or plastic fiber, offering high bandwidth and security.
Optical fiber transmits data as light signals through a glass or plastic fiber, offering high bandwidth and security.
In a star topology network, if the central hub fails, what happens to the network?
- A. Only one computer gets disconnected
- B. The entire network becomes non-functional
- C. Other computers continue communicating
- D. The network automatically reconfigures
Answer: B. The entire network becomes non-functional
In star topology, the central hub is a single point of failure; if it fails, all connected devices lose network connectivity.
In star topology, the central hub is a single point of failure; if it fails, all connected devices lose network connectivity.
Comparing star and bus topologies, which statement is TRUE?
- A. Bus topology is more expensive than star topology
- B. Star topology has a single point of failure at the central device
- C. Bus topology offers better security than star topology
- D. Both topologies have identical bandwidth efficiency
Answer: B. Star topology has a single point of failure at the central device
Star topology's central hub is a single point of failure; if it fails, the entire network goes down, whereas bus topology is more fault-tolerant.
Star topology's central hub is a single point of failure; if it fails, the entire network goes down, whereas bus topology is more fault-tolerant.