Wednesday, May 6, 2026

Data Communication and Computer network_MCQ

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  1. The IP network 192.168.20.0 is to be divided into 10 equal sized subnets. Which subnet mask can be used?
    a. 255.243.240
    b. 255.255.255.254
    c. 255.255.255.0 ✓
    d. 255.255.255.231

  2. What we call the number of error bits that occur for a given number of bits transmitted?
    a. Bit error rate ✓
    b. Bit error
    c. Error rate
    d. Error bit rate

  3. Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?
    a. CDMA
    b. ALOHA
    c. CSMA/CA ✓
    d. CSMA/CD

  4. What determines number of repeater in a coaxial cable link?
    a. Separation of equalizers
    b. The number of coaxial cables in the tube
    c. Modulation
    d. System bandwidth ✓

  5. Which of the following is true with respect to TCP?
    a. Connection-oriented
    b. Process-to-Process
    c. Transport layer protocol
    d. All of the mentioned ✓

  6. Which device receives digital signal, recovers 1s and 0s and retransmits a new signal?
    a. Repeater ✓
    b. Amplifier
    c. Router
    d. Booster

  7. Why do we use a firewall in the network layer?
    a. For Frame Filter
    b. For Packet filter ✓
    c. For Content filter
    d. For Virus filter

  8. Which layer removes network layer header before passing to transport layer?
    a. Data link
    b. Network ✓
    c. Transport
    d. Session

  9. Which protocol provides remote login access?
    a. FTP
    b. SNMP
    c. SMTP
    d. TELNET ✓

  10. Which address is used by routing table in a switch?
    a. Source
    b. Local
    c. Datagram
    d. Destination ✓

  1. Why ICMP is used in the e-mail service?
    a. Error and diagnostic function ✓
    b. Addressing
    c. Forwarding
    d. Routing

  2. Which algorithm defines the network path for each packet?
    a. Blocking algorithm
    b. Switching algorithm
    c. Routing algorithm ✓
    d. Networking algorithm

  3. Which protocol provides reliable and instant delivery?
    a. TCP ✓
    b. UDP
    c. IP
    d. FTP

  4. Methods to move data through a network?
    a. Packet switching and Line switching
    b. Circuit Switching and Line switching
    c. Line Switching and bit switching
    d. Packet Switching and Circuit Switching ✓

  5. Which communication protocol is used by internet?
    a. HTTP
    b. WWW
    c. TCP/IP ✓
    d. FTP

  6. Which network topology requires multipoint connection?
    a. Star
    b. Mesh
    c. Ring
    d. Bus ✓

  7. Natural mask for class C network?
    a. 255.255.255.1
    b. 255.255.255.0 ✓
    c. 255.255.255.254
    d. 255.255.255.255

  8. Which command displays RIP routing updates?
    a. Show IP route
    b. Debug IP rip ✓
    c. Show protocols
    d. Debug IP route

  9. Correct statement about TDM?
    a. TDM requires synchronization ✓
    b. Efficient for probabilistic data
    c. Statistical TDM for deterministic data
    d. All of the above

  10. What is controlled by IEEE 802?
    a. Errors
    b. Flow
    c. Frames
    d. All of above ✓

  11. Electromagnetic waves between 3KHz–1GHz?
    a. High frequency
    b. Radio Waves ✓
    c. Infrared
    d. Microwaves

  12. Which modulation is based on frequency shifting keying?
    a. Amplitude Modulation
    b. Phase Modulation
    c. Frequency Modulation
    d. Digital to Digital Modulation ✓

  13. Device used in analog transmission for long distance?
    a. Repeaters
    b. Routers
    c. Boosters
    d. Amplifiers ✓

  14. Which layer maintains and synchronizes interaction?
    a. Session ✓
    b. Network
    c. Transport
    d. Presentation

  15. Which address remains same during packet journey?
    a. Source ✓
    b. Destination
    c. Local
    d. Physical

  16. Routing method where path is in packet header?
    a. Destination routing
    b. Source Switching
    c. Source Routing ✓
    d. Destination Switching

  17. Class of IP 126.5.6.7?
    a. Class A ✓
    b. Class B
    c. Class C
    d. Class D

  18. Protocol to get files from internet?
    a. HTTP
    b. TELNET
    c. UTP
    d. FTP ✓

  19. Protocol for remote login?
    a. FTP
    b. TELNET ✓
    c. SNMP
    d. SMTP

  20. Wireless LAN standard?
    a. IEEE 802.3
    b. IEEE 802.5
    c. IEEE 802.11 ✓
    d. IEEE 802.2

  21. Signal loses strength due to medium?
    a. Attenuation ✓
    b. Noise
    c. Distortion
    d. Decibel

  22. Multiplexing using light beams?
    a. WDM ✓
    b. FDM
    c. TDM
    d. SDMA

  23. Cable used to connect similar devices?
    a. Straight Cable
    b. Serial Cable
    c. Cross Over Cable ✓
    d. All of Above

  24. Subcategories of packet switching?
    a. Virtual-Circuit networks and datagram networks ✓
    b. Carrier-circuit and datagram
    c. Virtual-circuit and Bitgram
    d. All of the above

  25. Which is NOT a class of LAN?
    a. Broadband ✓
    b. Token Bus
    c. CSMA/CD
    d. Token Ring

  26. Connector for thin coaxial cable?
    a. BNC ✓
    b. UI
    c. RJ-11
    d. RJ-45

  27. Loopback address?
    a. 0.0.0.1
    b. 127.0.0.1 ✓
    c. 255.255.255.255
    d. 127.0.0.0

  28. Connectionless transport protocol?
    a. UDP ✓
    b. TCP
    c. FTP
    d. Nvt

  29. Device that rebroadcasts signal?
    a. Repeater ✓
    b. Bridge
    c. Gateway
    d. Router

  30. IEEE standard for PAN?
    a. 802.15 ✓
    b. 802.11
    c. 802.3
    d. 802.16

  1. Which switching method checks error before forwarding?
    a. Cut-through
    b. Store-and-forward ✓
    c. Fragment-free
    d. Fast-forward
  2. Which protocol uses port 53?
    a. HTTP
    b. FTP
    c. DNS ✓
    d. SMTP
  3. Which device separates collision domains?
    a. Hub
    b. Switch ✓
    c. Repeater
    d. Modem
  4. Which layer is responsible for routing?
    a. Transport
    b. Network ✓
    c. Data Link
    d. Session
  5. Which protocol is used for secure web browsing?
    a. HTTP
    b. FTP
    c. HTTPS ✓
    d. TELNET
  6. Which topology uses token passing?
    a. Bus
    b. Star
    c. Ring ✓
    d. Mesh
  7. Which device connects networks with different protocols?
    a. Router
    b. Switch
    c. Gateway ✓
    d. Hub
  8. What is the default port of POP3?
    a. 21
    b. 25
    c. 53
    d. 110 ✓
  9. Which protocol is used for time synchronization?
    a. FTP
    b. SMTP
    c. NTP ✓
    d. HTTP
  10. Which layer ensures reliable delivery?
    a. Network
    b. Transport ✓
    c. Data Link
    d. Physical
  1. Which protocol uses port 443?
    a. HTTP
    b. FTP
    c. HTTPS ✓
    d. SMTP
  2. Which device forwards data based on IP address?
    a. Hub
    b. Switch
    c. Router ✓
    d. Bridge
  3. Which layer is responsible for framing?
    a. Physical
    b. Data Link ✓
    c. Network
    d. Transport
  4. Which protocol is used to assign IP automatically?
    a. DNS
    b. DHCP ✓
    c. ARP
    d. ICMP
  5. Which topology is easiest to install?
    a. Mesh
    b. Ring
    c. Bus ✓
    d. Hybrid
  6. Which protocol is used to send large files?
    a. SMTP
    b. FTP ✓
    c. SNMP
    d. TELNET
  7. Which device reduces network traffic?
    a. Hub
    b. Switch ✓
    c. Repeater
    d. Modem
  8. Which address is logical address?
    a. IP ✓
    b. MAC
    c. Port
    d. Physical
  9. Which layer handles error detection?
    a. Transport
    b. Data Link ✓
    c. Session
    d. Presentation
  10. Which protocol is used to test connectivity?
    a. FTP
    b. SMTP
    c. ICMP ✓
    d. SNMP
  11. Which cable is immune to electromagnetic interference?
    a. Twisted pair
    b. Coaxial
    c. Fiber optic ✓
    d. Serial
  12. Which topology is costly?
    a. Bus
    b. Star
    c. Mesh ✓
    d. Ring
  13. Which protocol uses port 25?
    a. FTP
    b. SMTP ✓
    c. HTTP
    d. DNS
  14. Which device operates at Physical layer only?
    a. Hub ✓
    b. Router
    c. Switch
    d. Gateway
  15. Which protocol is used for file sharing in Windows?
    a. FTP
    b. SMB ✓
    c. HTTP
    d. SMTP
  16. Which IP class has range 192–223?
    a. Class A
    b. Class B
    c. Class C ✓
    d. Class D
  17. Which layer is responsible for session management?
    a. Transport
    b. Session ✓
    c. Network
    d. Data Link
  18. Which protocol translates private IP to public IP?
    a. DNS
    b. DHCP
    c. NAT ✓
    d. ARP
  19. Which topology has a single point of failure?
    a. Mesh
    b. Star ✓
    c. Bus
    d. Ring
  20. Which protocol uses port 110?
    a. FTP
    b. SMTP
    c. POP3 ✓
    d. HTTP 
  21. Which protocol uses port 22?
    a. TELNET
    b. FTP
    c. SSH ✓
    d. SMTP
  22. Which device connects two LAN segments?
    a. Router
    b. Bridge ✓
    c. Hub
    d. Modem
  23. Which layer converts data into signals?
    a. Data Link
    b. Network
    c. Transport
    d. Physical ✓
  24. Which protocol is used for secure remote login?
    a. TELNET
    b. FTP
    c. SSH ✓
    d. HTTP
  25. Which address is used for broadcasting?
    a. 127.0.0.1
    b. 0.0.0.0
    c. 255.255.255.255 ✓
    d. 192.168.1.1
  26. Which device filters traffic based on IP?
    a. Hub
    b. Bridge
    c. Router ✓
    d. Repeater
  27. Which topology is used in Ethernet LAN?
    a. Ring
    b. Bus ✓
    c. Mesh
    d. Star
  28. Which protocol uses port 20?
    a. HTTP
    b. FTP ✓
    c. SMTP
    d. DNS
  29. Which layer ensures data formatting?
    a. Session
    b. Presentation ✓
    c. Network
    d. Transport
  30. Which protocol is used to send ping?
    a. TCP
    b. UDP
    c. ICMP ✓
    d. FTP
  31. Which network type is smallest?
    a. WAN
    b. MAN
    c. LAN
    d. PAN ✓
  32. Which device works at multiple layers?
    a. Hub
    b. Switch
    c. Gateway ✓
    d. Repeater
  33. Which protocol uses port 53?
    a. FTP
    b. SMTP
    c. DNS ✓
    d. HTTP
  34. Which layer divides data into packets?
    a. Data Link
    b. Network ✓
    c. Session
    d. Physical
  35. Which cable uses RJ-45 connector?
    a. Coaxial
    b. Twisted Pair ✓
    c. Fiber
    d. Serial
  36. Which protocol is used for streaming?
    a. FTP
    b. SMTP
    c. RTP ✓
    d. DNS
  37. Which topology is point-to-point connection?
    a. Bus
    b. Star
    c. Mesh ✓
    d. Ring
  38. Which IP class is reserved for multicast?
    a. Class A
    b. Class B
    c. Class C
    d. Class D ✓
  39. Which protocol is unreliable?
    a. TCP
    b. UDP ✓
    c. FTP
    d. HTTP
  40. Which device amplifies signal strength?
    a. Router
    b. Switch
    c. Bridge
    d. Repeater ✓
  41. Which protocol provides reliable data transfer?
    a. UDP
    b. IP
    c. TCP ✓
    d. ICMP
  42. Which layer is responsible for routing packets?
    a. Data Link
    b. Network ✓
    c. Transport
    d. Session
  43. What is the default port number of HTTP?
    a. 21
    b. 23
    c. 80 ✓
    d. 110
  44. Which protocol maps IP address to MAC address?
    a. DNS
    b. ARP ✓
    c. ICMP
    d. FTP
  45. Which topology has a central hub?
    a. Star ✓
    b. Bus
    c. Ring
    d. Mesh
  46. Which device connects different networks?
    a. Switch
    b. Hub
    c. Router ✓
    d. Repeater
  47. Which protocol is connectionless?
    a. UDP ✓
    b. TCP
    c. FTP
    d. SMTP
  48. Which IP address is loopback?
    a. 0.0.0.0
    b. 127.0.0.1 ✓
    c. 255.255.255.255
    d. 192.168.1.1
  49. Which layer ensures end-to-end communication?
    a. Network
    b. Transport ✓
    c. Data Link
    d. Physical
  50. Which protocol is used for file transfer?
    a. HTTP
    b. SMTP
    c. FTP ✓
    d. SNMP
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