Data Communications & Computer Networking: 300 Questions & Answers | Comprehensive Exam Preparation (All Chapters, 100% original verified, A+ Grade)

Data Communications & Computer Networking: 300 Questions & Answers | Comprehensive Exam Preparation (All Chapters, 100% original verified, A+ Grade) Study Edition Networking fundamentals • TCP/IP • OSI concepts • Switches & routers • Addressing • Wireless • Security • Cloud • Network services • Troubleshooting  1. A student connects a laptop to a wireless network at a café. Which medium is most directly usedfor the local wireless link? A. Infrared B. Radio frequency C. Ultraviolet D. X-ray Correct Answer: B. Radio frequency Rationale: Wi-Fi uses radio-frequency electromagnetic waves. 2. Which characteristic most strongly distinguishes a personal area network (PAN) from a LAN? A. It normally covers an entire city B. It is centered around an individual and nearby devices C. It always requires fiber optic cable D. It connects multiple countries Correct Answer: B. It is centered around an individual and nearby devices Rationale: A PAN connects devices in a small area around one person. 3. A home contains phones, tablets, computers, a smart TV, and a router. What type of networknormally connects the devices within the home? A. LAN B. WAN C. MAN D. SAN Correct Answer: A. LAN Rationale: A home network is generally a local area network. 4. A company connects offices in Nairobi, Mombasa, and Kisumu over carrier links. What type ofnetwork is involved? A. PAN B. LAN C. WAN D. BAN Correct Answer: C. WAN Rationale: A WAN connects networks across large geographic areas. 5. Which network type is designed to cover a metropolitan or city-scale area? A. PAN B. MAN C. LAN D. SAN Correct Answer: B. MAN Rationale: A metropolitan area network (MAN) is designed around a city or metropolitan region. 6. Which device primarily forwards frames within a LAN using MAC addresses? A. Router B. Switch C. Modem D. Firewall Correct Answer: B. Switch Rationale: A switch uses MAC addresses to forward Ethernet frames within a LAN. 7. Which device normally forwards packets between different IP networks? A. Switch B. Router C. Repeater D. Access point Correct Answer: B. Router Rationale: Routers make forwarding decisions between IP networks. 8. Which protocol suite is the foundation of modern Internet communication? A. TCP/IP B. FTP/SMTP C. HTML/CSS D. USB/PCI Correct Answer: A. TCP/IP Rationale: TCP/IP provides the core protocols used for Internet communication. 9. Which protocol operates at the transport layer and provides reliable, connection-oriented delivery? A. IP B. TCP C. ARP D. DNS Correct Answer: B. TCP Rationale: TCP provides connection-oriented, reliable transport. 10. Which service translates a domain name such as into an IP address? A. DHCP B. DNS C. ARP D. NTP Correct Answer: B. DNS Rationale: DNS resolves domain names to IP addresses. 11. Which service commonly assigns IP configuration automatically to clients? A. DNS B. DHCP C. HTTP D. SSH Correct Answer: B. DHCP Rationale: DHCP can automatically provide IP addresses and other network settings. 12. Which protocol is commonly used to securely administer a remote server through a commandline? A. HTTP B. SSH C. FTP D. SNMP Correct Answer: B. SSH Rationale: SSH provides encrypted remote administration. 13. Which protocol is primarily used to transfer web pages from a web server to a client? A. HTTP B. SMTP C. IMAP D. ARP Correct Answer: A. HTTP Rationale: HTTP is the core protocol for web communication. 14. Which protocol is commonly used to send email between mail servers? A. SMTP B. DNS C. DHCP D. RDP Correct Answer: A. SMTP Rationale: SMTP is used for email submission and transfer. 15. Which protocol can retrieve email while keeping messages synchronized on the server? A. IMAP B. ARP C. ICMP D. FTP Correct Answer: A. IMAP Rationale: IMAP is designed for server-side mailbox synchronization. 16. Which protocol is commonly used to obtain network configuration automatically? A. DHCP B. SSH C. SMTP D. TLS Correct Answer: A. DHCP Rationale: DHCP distributes configuration such as IP address, gateway, and DNS information. 17. Which device provides wireless clients with access to a wired LAN? A. Access point B. Printer C. UPS D. Patch panel Correct Answer: A. Access point Rationale: An access point bridges wireless clients to a network. 18. Which physical medium carries data as pulses of light? A. Coaxial cable B. Twisted pair C. Fiber-optic cable D. Copper bus Correct Answer: C. Fiber-optic cable Fiber-optic cable transmits data using light. 19. Which cable type is commonly used for Ethernet connections in office LANs? A. Twisted-pair copper B. HDMI C. Power cable D. Speaker wire Correct Answer: A. Twisted-pair copper Rationale: Twisted-pair Ethernet cabling is widely used in LANs. 20. What does bandwidth describe in a networking context? A. The maximum data-carrying capacity of a link B. The physical length of a cable C. The number of passwords on a server D. The number of routers in a building Correct Answer: A. The maximum data-carrying capacity of a link Rationale: Bandwidth describes the capacity of a communication link.