MCQs

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1. Which protocol allows devices to sense the channel before transmitting to avoid data collisions?
   a. CSMA/CD
   b. TDMA
   c. FDMA
   d. CDMA
   Correct Answer: avcenter+2
2. What does the abbreviation CSMA/CD stand for?
   a. Carrier Sense Multiple Access/Collision Detection
   b. Computer Synchronized Multiple Assignment/Channel Division
   c. Centralized Synchronous Media Access/Collision Detection
   d. Carrier Switch Multiplexing Access/Collision Diagnosis
   Correct Answer: ageeksforgeeks+1
3. Which IEEE standard defines CSMA/CD as a MAC protocol?
   a. IEEE 802.3
   b. IEEE 802.11
   c. IEEE 802.5
   d. IEEE 802.15
   Correct Answer: abyjus+1
4. In CSMA/CD, what happens if a node detects a collision during data transmission?
   a. Stops transmitting and sends a jam signal
   b. Continues transmitting and ignores the collision
   c. Waits for an acknowledgment
   d. Retransmits immediately without stopping
   Correct Answer: avcenter+1
5. What is the primary function of carrier sensing in CSMA/CD?
   a. To listen to the medium before transmitting
   b. To assign channels to specific devices
   c. To prevent all collisions
   d. To encrypt transmitted data
   Correct Answer: abyjus+1
6. When two nodes transmit simultaneously in CSMA/CD, what is likely to occur?
   a. Collision
   b. Frame drop
   c. Channel bonding
   d. Data encryption
   Correct Answer: ageeksforgeeks+1
7. In which topology is CSMA/CD commonly implemented?
   a. Bus
   b. Star
   c. Ring
   d. Mesh
   Correct Answer: avcenter+1
8. What signal is sent after a collision is detected in CSMA/CD?
   a. Jam signal
   b. Acknowledgement signal
   c. Echo signal
   d. Termination signal
   Correct Answer: ageeksforgeeks+2
9. After a collision in CSMA/CD, what determines how long a device waits before retransmitting?
   a. Random backoff algorithm
   b. Fixed timer
   c. Priority queue
   d. Central server
   Correct Answer: abyjus+2
10. Which layer of the OSI model does CSMA/CD operate at?
    a. Data Link
    b. Network
    c. Physical
    d. Transport
    Correct Answer: ageeksforgeeks+1
11. If the CSMA/CD network becomes increasingly crowded with devices, what typically happens to performance?
    a. Performance decreases
    b. Performance increases
    c. No change
    d. Becomes unpredictable
    Correct Answer: ageeksforgeeks
12. What is the first step in the CSMA/CD algorithm?
    a. Sense carrier for activity
    b. Transmit data immediately
    c. Send a jam signal
    d. Wait for acknowledgment
    Correct Answer: avcenter+1
13. Which of the following is NOT true about CSMA/CD?
    a. It guarantees collision-free transmission
    b. It can detect collisions
    c. It is used in wired Ethernet
    d. It uses a random backoff time after collisions
    Correct Answer: abyjus+1
14. Which access method works on a first-come, first-served basis in shared media?
    a. CSMA/CD
    b. TDMA
    c. FDMA
    d. Token passing
    Correct Answer: atestbook
15. CSMA/CD is most effective in networks with __?
    a. Fewer users and short distances
    b. Many users and long distances
    c. High error rates
    d. Wireless links
    Correct Answer: abyjus+1
16. What is the primary disadvantage of CSMA/CD?
    a. Collisions still degrade performance
    b. High overhead
    c. Support for large, long-distance networks
    d. Centralized control requirement
    Correct Answer: ageeksforgeeks
17. Which signal does a station transmit after collision detection to inform others?
    a. Jam signal
    b. Error signal
    c. Timeout signal
    d. Handshake signal
    Correct Answer: avcenter+2
18. How does CSMA/CD improve bandwidth usage?
    a. Stops transmission upon collision and avoids waste
    b. Reserves the channel for a user
    c. Prioritizes data types
    d. Encrypts all data
    Correct Answer: ageeksforgeeks
19. What action is taken if the maximum number of retransmissions is reached in CSMA/CD?
    a. Transmission is aborted
    b. Data is queued again
    c. an error is logged and retry occurs immediately
    d. The frame is broadcasted
    Correct Answer: abyjus
20. Which access control mechanism is considered the basis for traditional Ethernet?
    a. CSMA/CD
    b. Polling
    c. Token passing
    d. Bluetooth
    Correct Answer: abyjus+1
21. Which of these actions characterizes collision detection in CSMA/CD?
    a. Monitoring the medium while sending data
    b. Waiting for acknowledgment every time
    c. Requiring central arbitration
    d. Priority scheduling of nodes
    Correct Answer: avcenter+1
22. When a device in CSMA/CD senses that the channel is busy, it will:
    a. Wait until it becomes idle
    b. Transmit immediately anyway
    c. Disconnect from the network
    d. Send a jam signal
    Correct Answer: avcenter+1
23. In CSMA/CD, what increases exponentially with more network devices?
    a. Collisions
    b. Transmission speed
    c. Error correction
    d. Channel bandwidth
    Correct Answer: ageeksforgeeks
24. CSMA/CD was popular primarily in which of the following generations of Ethernet?
    a. Early Ethernet (10BASE5, 10BASE2)
    b. Fast Ethernet
    c. Gigabit Ethernet (1000BASE-T)
    d. 802.11 Wireless LAN
    Correct Answer: abyjus+1
25. Which MAC protocol is NOT suitable for wireless LANs?
    a. CSMA/CD
    b. CSMA/CA
    c. TDMA
    d. FDMA
    Correct Answer: avcenter+1
26. In CSMA/CD, what is the purpose of the random backoff time after a collision?
    a. Reduce likelihood of repeated collisions
    b. Give higher priority to critical devices
    c. Assign static time intervals for all devices
    d. Reset the entire network
    Correct Answer: avcenter+2
27. Which process does not use CSMA/CD?
    a. Token Ring network
    b. Traditional Ethernet
    c. Bus topology LAN
    d. Coaxial cable-based LAN
    Correct Answer: abyjus+1
28. If a device keeps detecting collisions during each attempt, what will eventually happen in CSMA/CD?
    a. Transmission is abandoned after some retries
    b. Device will take priority
    c. Frames are split into smaller segments
    d. Jam signal is ignored
    Correct Answer: abyjus
29. Why is CSMA/CD not effective on wireless LANs?
    a. Nodes cannot reliably detect simultaneous transmission
    b. Too many jam signals are needed
    c. Wired Ethernet is faster
    d. It adds encryption overhead
    Correct Answer: avcenter
30. What is the minimum frame size related to in CSMA/CD?
    a. Propagation delay and collision detection
    b. Encryption standard
    c. The number of devices
    d. Error correction
    Correct Answer: atestbook+1
31. How does CSMA/CD handle an idle channel?
    a. Transmission starts immediately
    b. Sends a reservation packet
    c. Waits for synchronization
    d. Broadcasts a jam signal
    Correct Answer: avcenter+1
32. In which type of networking has CSMA/CD been mostly abandoned?
    a. Modern full-duplex Ethernet
    b. Early coaxial LANs
    c. Industrial control networks
    d. Token bus
    Correct Answer: ageeksforgeeks
33. What type of network traffic is most problematic for CSMA/CD?
    a. Heavy, bursty traffic
    b. Continuous low-data flows
    c. Multicast traffic
    d. Management traffic
    Correct Answer: ageeksforgeeks
34. Jam signals in CSMA/CD usually serve which purpose?
    a. Notify all stations of a collision
    b. Synchronize all time slots
    c. Encrypt frames after collision
    d. Vertify frame integrity
    Correct Answer: ageeksforgeeks+1
35. CSMA/CD ensures which of the following?
    a. Only that collisions are detected and handled, but not their prevention
    b. Absolute collision prevention
    c. Guaranteed delivery
    d. Centralized control
    Correct Answer: abyjus+1
36. Why does CSMA/CD require a minimum frame size?
    a. To ensure that collisions are detected by all stations
    b. To allow for variable transmission rates
    c. For compatibility with wireless networks
    d. To support encryption
    Correct Answer: atestbook
37. In an Ethernet LAN, the time needed for a signal to travel to the end and back is called:
    a. Round-trip propagation delay
    b. Transmission time
    c. Acknowledgment interval
    d. Bandwidth delay
    Correct Answer: ageeksforgeeks+1
38. In which direction can data be transmitted in a CSMA/CD Ethernet LAN?
    a. Half-duplex only
    b. Full-duplex only
    c. Simplex only
    d. Any direction is allowed
    Correct Answer: aionos
39. What is the impact of increased cable lengths in a CSMA/CD network?
    a. Increases collision domain size and detection time
    b. Reduces transmission errors
    c. Increases bandwidth
    d. Decreases the need for jam signals
    Correct Answer: aionos+1
40. Which of the following is a feature of CSMA/CD?
    a. Decentralized control of channel access
    b. Guaranteed bandwidth per user
    c. Always uses fiber optic cable
    d. No retransmission
    Correct Answer: avcenter+1
41. On what principle does CSMA/CD base its contention resolution?
    a. First-come, first-served access
    b. Priority scheduling
    c. Usage quotas
    d. Centralized arbitration
    Correct Answer: atestbook+1
42. If no collision is detected after transmitting a frame, a device in CSMA/CD will:
    a. Complete transmission and reset counters
    b. Send multiple jam signals
    c. Wait for confirmation
    d. Restart the transmission
    Correct Answer: abyjus+1
43. In what scenario is the use of CSMA/CD not recommended?
    a. Modern switched Ethernet
    b. Early-nineties coaxial Ethernet
    c. Shared media LANs
    d. Wired customer premises networks
    Correct Answer: ageeksforgeeks
44. Carrier sense in CSMA/CD means:
    a. Listening to the network before transmitting
    b. Reserving the network in advance
    c. Assigning a token before transmitting
    d. Encrypting frames before sending
    Correct Answer: avcenter+1
45. In CSMA/CD networks, the efficiency depends on:
    a. Network load and propagation delay
    b. Encryption algorithm
    c. Number of switches
    d. Type of file being sent
    Correct Answer: abyjus+1
46. CSMA/CD is classified as which type of protocol?
    a. Contention-based
    b. Deterministic
    c. Token-passing
    d. Polling-based
    Correct Answer: avcenter+2
47. Which field in an Ethernet frame does NOT impact CSMA/CD operation?
    a. Destination MAC address
    b. Frame length
    c. Min. frame size
    d. Preamble
    Correct Answer: atestbook+1
48. Which of these is necessary for CSMA/CD to function effectively?
    a. Nodes must be able to detect collisions
    b. Centralized traffic control
    c. Full-duplex transmission
    d. Fiber-optic infrastructure
    Correct Answer: abyjus+1
49. What is the main limitation of CSMA/CD as networks grow in size?
    a. Increased collisions and network inefficiency
    b. More bandwidth for each device
    c. Faster propagation
    d. Improved security
    Correct Answer: ageeksforgeeks
50. What happens during the backoff period in CSMA/CD?
    a. Stations wait random times before retransmitting
    b. All stations broadcast a jam signal
    c. The network switches to full-duplex mode
    d. A centralized scheduler allocates transmission times
    Correct Answer: avcenter+1

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2. https://www.geeksforgeeks.org/computer-networks/csma-cd-full-form/
3. https://byjus.com/gate/csma-cd-notes/
4. https://testbook.com/objective-questions/mcq-on-access-method–5eea6a1539140f30f369f318
5. https://testbook.com/question-answer/the-network-using-csmacd-has-a-bandwidth-of-20-mb–67a732e274632a50f95e025a
6. https://www.ionos.com/digitalguide/server/know-how/csmacd-carrier-sense-multiple-access-collision-detection/
7. https://examradar.com/multiple-access-mcq-data-communication-networking/
8. https://www.sanfoundry.com/computer-networks-questions-answers-multiple-access-links-protocols/
9. https://mcqslearn.com/cs/computer-networks/csma-cd.php
10. https://gateatzeal.com/blogs/csma-cd-questions-for-gate/
11. https://www.geeksforgeeks.org/computer-networks/collision-detection-csmacd/
12. https://wayground.com/admin/quiz/66a74e907310fc3983db219c/csmacd-realtime-vs-ondemand
13. https://www.geeksforgeeks.org/computer-networks/carrier-sense-multiple-access-csma/
14. https://www.scribd.com/document/258623480/lab2-100
15. https://www.softwaretestinghelp.com/what-is-csma-cd/
16. https://www.tutorialspoint.com/csma-with-collision-detection-csma-cd
17. https://bcetodisha.ac.in/elearning/content/mca_uploads/2nd/Computer-Network-MCQ.pdf
18. https://en.wikipedia.org/wiki/Carrier-sense_multiple_access_with_collision_detection
19. https://www.sanfoundry.com/computer-network-random-access-protocols-aloha-csma-csma-ca-csma-cd/
20. https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/ADA212978.xhtml