Computer Networks MCQs with Answers
Practice important Computer Networks MCQs with answers and explanations.
Multiple Choice Questions
Q281: What does a computer do before transmitting in CSMA?
- A: Encrypt data
- B: Compress the frame
- C: Sense if the cable is idle
- D: Check power usage
View Answer
C
Q282: What is the effect of a collision in Ethernet?
- A: Hardware damage
- B: Grabbled data
- C: Power loss
- D: Frame optimization
View Answer
B
Q283: Which signal is sent after detecting a collision?
- A: A short pulse
- B: A backoff signal
- C: A forceful signal to other interfaces
- D: A retry request
View Answer
C
Q284: How do computers decide when to retransmit after a collision?
- A: By signal strength
- B: By priority level
- C: By choosing random delay
- D: By checking signal voltage
View Answer
C
Q285: What is exponential backoff used for?
- A: To reduce cable cost
- B: To increase data rate
- C: To avoid multiple collisions
- D: To encrypt messages
View Answer
C
Q286: What is the data rate of IEEE 802.11 wireless LANs?
- A: 2Mbps
- B: 11Mbps
- C: 100Mbps
- D: 230.4Kbps
View Answer
B
Q287: Which frequency is used by older wireless LAN devices?
- A: 2.4GHz
- B: 900MHz
- C: 5GHz
- D: 1.8GHz
View Answer
B
Q288: Which of the following is a reason for limited connectivity in wireless LANs?
- A: High bandwidth
- B: Open environment
- C: Low signal strength
- D: High data rate
View Answer
C
Q289: In wireless networks, why can't collision detection be used?
- A: Because of wired limitations
- B: Because not all participants can hear each other
- C: Because data is encrypted
- D: Because frames are small
View Answer
B
Q290: What mechanism does CSMA/CA use to avoid collisions?
- A: Token passing
- B: Short messages to reserve slot
- C: Backbone control
- D: Multicast routing
View Answer
B