Computer Networks MCQs with Answers
Practice important Computer Networks MCQs with answers and explanations.
Chapter: 8
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
Correct Answer:
C
Chapter: 8
Q282:
What is the effect of a collision in Ethernet?
A. Hardware damage
B. Grabbled data
C. Power loss
D. Frame optimization
Correct Answer:
B
Chapter: 8
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
Correct Answer:
C
Chapter: 8
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
Correct Answer:
C
Chapter: 8
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
Correct Answer:
C
Chapter: 8
Q286:
What is the data rate of IEEE 802.11 wireless LANs?
A. 2Mbps
B. 11Mbps
C. 100Mbps
D. 230.4Kbps
Correct Answer:
B
Chapter: 8
Q287:
Which frequency is used by older wireless LAN devices?
A. 2.4GHz
B. 900MHz
C. 5GHz
D. 1.8GHz
Correct Answer:
B
Chapter: 8
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
Correct Answer:
C
Chapter: 8
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
Correct Answer:
B
Chapter: 8
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
Correct Answer:
B
Chapter: 8
Q291:
What does a receiver do when it gets closely spaced requests?
A. Ignores all
B. Selects one and sends response
C. Sends error message
D. Waits for retry
Correct Answer:
B
Chapter: 8
Q292:
What LAN technology was invented by Apple?
A. Ethernet
B. Token Ring
C. Local Talk
D. Wi-Fi
Correct Answer:
C
Chapter: 8
Q293:
What is the speed of Local Talk?
A. 100Mbps
B. 2Mbps
C. 11Mbps
D. 230.4Kbps
Correct Answer:
D
Chapter: 8
Q294:
Which topology does Token Ring use?
A. Bus
B. Ring
C. Star
D. Tree
Correct Answer:
B
Chapter: 8
Q295:
What is passed in Token Ring to allow transmission?
A. Message
B. Signal
C. Frame
D. Token
Correct Answer:
D
Chapter: 8
Q296:
What ensures only one computer transmits at a time in Token Ring?
A. Token
B. Carrier sense
C. Collision avoidance
D. Priority bits
Correct Answer:
A
Chapter: 8
Q297:
How does a computer use the token in Token Ring?
A. Encrypts it
B. Discards it
C. Sends it on ring after transmission
D. Stores it in buffer
Correct Answer:
C
Chapter: 8
Q298:
What happens if no computer is ready to transmit in Token Ring?
A. Token is lost
B. Token circulates around the ring
C. Token is stored
D. Token is regenerated
Correct Answer:
B
Chapter: 8
Q299:
What is the maximum speed of IBM Token Ring?
A. 4Mbps
B. 8Mbps
C. 16Mbps
D. 32Mbps
Correct Answer:
C
Chapter: 8
Q300:
Which technology uses fiber optics and 100Mbps speed?
A. Local Talk
B. Wi-Fi
C. Ethernet
D. FDDI
Correct Answer:
D