Data Communication & Networking

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  1. Which field in an IPv4 header specifies packet lifetime?
    A. Version
    B. TTL
    C. Protocol
    D. Header Length
    Answer: B
  2. Which routing protocol is based on link-state algorithm?
    A. RIP
    B. BGP
    C. OSPF
    D. IGRP
    Answer: C
  3. Which port number is used by DNS?
    A. 21
    B. 53
    C. 110
    D. 143
    Answer: B
  4. What is the main function of a gateway?
    A. Amplify signals
    B. Connect different protocols/networks
    C. Switch frames
    D. Filter MAC addresses
    Answer: B
  5. Which technique is used in Wi-Fi to avoid collisions?
    A. CSMA/CD
    B. CSMA/CA
    C. Token Passing
    D. Polling
    Answer: B
  6. Which protocol operates at the application layer for file transfer?
    A. TCP
    B. FTP
    C. IP
    D. ARP
    Answer: B
  7. Which IPv6 address type is equivalent to broadcast in IPv4?
    A. Unicast
    B. Multicast
    C. Anycast
    D. Loopback
    Answer: B
  8. What does MTU stand for?
    A. Maximum Transmission Unit
    B. Minimum Transfer Unit
    C. Maximum Transfer Utility
    D. Medium Transmission Usage
    Answer: A
  9. Which protocol uses port 22?
    A. FTP
    B. Telnet
    C. SSH
    D. HTTP
    Answer: C
  10. Which device works at the Physical layer only?
    A. Switch
    B. Router
    C. Hub
    D. Bridge
    Answer: C
  11. Which protocol is used for time synchronization?
    A. FTP
    B. SNMP
    C. NTP
    D. HTTP
    Answer: C
  12. What is the purpose of VLAN?
    A. Increase bandwidth
    B. Logical segmentation of network
    C. Reduce latency
    D. Physical separation
    Answer: B
  13. Which routing protocol is used on the internet backbone?
    A. RIP
    B. OSPF
    C. BGP
    D. EIGRP
    Answer: C
  14. What is the function of ICMP?
    A. Data transfer
    B. Error reporting
    C. Routing
    D. Encryption
    Answer: B
  15. Which transmission mode sends data in both directions alternately?
    A. Simplex
    B. Half-duplex
    C. Full-duplex
    D. Broadcast
    Answer: B
  16. Which layer uses frames?
    A. Physical
    B. Data Link
    C. Network
    D. Transport
    Answer: B
  17. What is the purpose of a proxy server?
    A. Increase bandwidth
    B. Act as intermediary
    C. Encrypt data
    D. Route packets
    Answer: B
  18. Which protocol provides secure web browsing?
    A. HTTP
    B. HTTPS
    C. FTP
    D. Telnet
    Answer: B
  19. What is the default subnet mask for Class C?
    A. 255.0.0.0
    B. 255.255.0.0
    C. 255.255.255.0
    D. 255.255.255.255
    Answer: C
  20. Which protocol uses port 25?
    A. SMTP
    B. POP3
    C. IMAP
    D. FTP
    Answer: A
  21. Which concept allows multiple devices to share a public IP?
    A. DHCP
    B. NAT
    C. DNS
    D. VLAN
    Answer: B
  22. Which layer performs segmentation?
    A. Transport
    B. Network
    C. Data Link
    D. Physical
    Answer: A
  23. What is a collision?
    A. Packet delay
    B. Packet duplication
    C. Simultaneous transmission conflict
    D. Routing error
    Answer: C
  24. Which protocol is used for network management?
    A. SNMP
    B. HTTP
    C. FTP
    D. SMTP
    Answer: A
  25. Which addressing is hierarchical?
    A. MAC
    B. IP
    C. Port
    D. URL
    Answer: B
  26. Which layer is responsible for routing?
    A. Data Link
    B. Network
    C. Transport
    D. Application
    Answer: B
  27. Which protocol retrieves emails?
    A. SMTP
    B. POP3
    C. HTTP
    D. SNMP
    Answer: B
  28. What is the function of checksum?
    A. Encryption
    B. Error detection
    C. Routing
    D. Addressing
    Answer: B
  29. Which device breaks collision domains?
    A. Hub
    B. Switch
    C. Repeater
    D. Cable
    Answer: B
  30. What is QoS used for?
    A. Security
    B. Prioritizing traffic
    C. Routing
    D. Addressing
    Answer: B
  31. Which protocol resolves domain names?
    A. DNS
    B. ARP
    C. DHCP
    D. ICMP
    Answer: A
  32. What is packet loss?
    A. Delay
    B. Missing packets
    C. Extra packets
    D. Duplicate packets
    Answer: B
  33. Which topology uses a circular path?
    A. Bus
    B. Ring
    C. Star
    D. Mesh
    Answer: B
  34. Which protocol uses port 110?
    A. SMTP
    B. POP3
    C. IMAP
    D. FTP
    Answer: B
  35. Which layer ensures reliable delivery?
    A. Transport
    B. Network
    C. Physical
    D. Application
    Answer: A
  36. What is a datagram?
    A. Fixed path packet
    B. Independent packet
    C. Large frame
    D. Signal
    Answer: B
  37. Which protocol supports multimedia streaming?
    A. RTP
    B. FTP
    C. SMTP
    D. ARP
    Answer: A
  38. What is the purpose of firewall rules?
    A. Allow/deny traffic
    B. Routing
    C. Switching
    D. Addressing
    Answer: A
  39. Which protocol uses port 143?
    A. POP3
    B. IMAP
    C. SMTP
    D. FTP
    Answer: B
  40. Which device isolates broadcast domains?
    A. Hub
    B. Switch
    C. Router
    D. Repeater
    Answer: C
  41. Which concept divides large networks into smaller parts?
    A. Routing
    B. Subnetting
    C. Switching
    D. Multiplexing
    Answer: B
  42. Which layer uses packets?
    A. Data Link
    B. Network
    C. Transport
    D. Physical
    Answer: B
  43. What is congestion?
    A. Packet delay
    B. Excess traffic
    C. Signal loss
    D. Collision
    Answer: B
  44. Which protocol provides secure remote access?
    A. Telnet
    B. SSH
    C. FTP
    D. HTTP
    Answer: B
  45. What is a socket?
    A. Hardware port
    B. Software endpoint
    C. Cable
    D. Signal
    Answer: B
  46. Which addressing identifies process?
    A. IP
    B. MAC
    C. Port
    D. URL
    Answer: C
  47. Which protocol uses port 20/21?
    A. FTP
    B. SMTP
    C. DNS
    D. HTTP
    Answer: A
  48. Which technique increases reliability?
    A. ARQ
    B. FDM
    C. TDM
    D. WDM
    Answer: A
  49. Which layer converts frames to packets?
    A. Data Link
    B. Network
    C. Transport
    D. Physical
    Answer: B
  50. Which protocol is used for automatic IP configuration?
    A. DNS
    B. DHCP
    C. ARP
    D. ICMP
    Answer: B
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