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WorksheetsComputer Network-1
Total questions: 18
Worksheet time: 9mins
A signal travels through a 1200 km fiber channel at a speed of 2×10^8 m/s,
What is the propagation delay?
a) 3 ms
b) 6 ms
c) 12 ms
d) 0.6 ms
Reservation protocols are most efficient when:
a) Traffic load is heavy
b) Traffic load is light
c) Only one station transmits
d) Frames are very large
Token passing is an example of:
a) Random access protocol
b) Controlled access protocol
c) Reservation protocol
d) Frequency division
In token passing, the probability of collision is:
a) High
b) Zero
c) Same as ALOHA
d) Depends on number of users
CSMA/CA is mainly used in:
a) Ethernet LAN
b) Wi-Fi (IEEE 802.11)
c) Token Ring
d) Bluetooth classic
CSMA/CA improves collision avoidance by:
a) Listening while transmitting
b) Using RTS/CTS control frames
c) Assigning frequency channels
d) Polling
In Ethernet (CSMA/CD), the minimum frame size is designed to ensure:
a) Error detection using CRC
b) Detection of collision before frame ends
c) Higher throughput
d) Reduced propagation delay
In CSMA/CD, the time to detect a collision is equal to:
a) One-way propagation delay
b) Two-way propagation delay
c) Frame transmission time
d) Bandwidth × delay
If frame transmission time is 2 ms, what is the vulnerable time in Slotted ALOHA?
a) 1 ms
b) 2 ms
c) 4 ms
d) 0.5 ms
The maximum efficiency of Slotted ALOHA is:
a) 18.4%
b) 36.8%
c) 50%
d) 100%
A Pure ALOHA network uses a 200 kbps channel and 200-bit frames. What is the frame transmission time?
a) 1 ms
b) 2 ms
c) 0.5 ms
d) 10 ms
In Pure ALOHA, the vulnerable time is:
a) T
b) 2T
c) T/2
d) 4T
In a reservation protocol:
a) Stations transmit randomly
b) Each station reserves a time slot before transmission
c) Only one station has a dedicated channel
d) Collisions are ignored
Token passing is an example of:
a) Random access protocol
b) Controlled access protocol
c) Reservation protocol
d) Frequency division multiplexing
In token passing protocol:
a) A central controller grants permission to transmit
b) Only the station with the token can transmit
c) Stations transmit randomly without coordination
d) The fastest station always transmits first
CSMA/CD is mainly used in:
a) Wi-Fi
b) Ethernet
c) Cellular networks
d) Bluetooth
A Pure ALOHA system transmits frames of 1000 bits on a 100 kbps channel. What is the frame transmission time?
a) 0.01 s
b) 0.1 s
c) 1 s
d) 10 ms
The maximum efficiency of Pure ALOHA is approximately:
a) 18.4%
b) 36.8%
c) 50%
d) 100%
