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Question 1. Which device is primarily responsible for forwarding packets based on destination IP addresses? A) Switch B) Router C) Hub D) Bridge Answer: B Explanation: Routers operate at Layer 3 and forward packets using destination IP addresses, making routing decisions accordingly. Question 2. What is the main function of a network switch? A) Forwarding frames based on MAC addresses B) Assigning IP addresses to hosts C) Connecting different networks D) Blocking all broadcast traffic Answer: A Explanation: Switches operate at Layer 2, forwarding frames within a LAN by examining MAC addresses. Question 3. Which network type typically covers the smallest geographic area? A) WAN B) MAN C) LAN D) CAN Answer: C Explanation: A Local Area Network (LAN) covers a small, localized area such as a building or campus. Question 4. Which topology connects each device to a central point? A) Mesh B) Bus
C) Star D) Ring Answer: C Explanation: In a star topology, all devices are connected to a central device, such as a switch or hub. Question 5. What is the primary difference between a WAN and a LAN? A) WAN uses wireless signals B) LAN connects multiple cities C) WAN spans larger geographic areas D) LAN uses only fiber optic cables Answer: C Explanation: WANs cover broad geographic areas, often connecting cities or countries, while LANs are limited to local areas. Question 6. Which OSI layer is responsible for reliable data transfer and flow control? A) Application B) Transport C) Network D) Data Link Answer: B Explanation: The Transport layer ensures reliable data transfer, error detection, and flow control. Question 7. What is the primary function of the OSI model? A) To provide a physical connection between devices B) To define a framework for network communication C) To assign IP addresses to devices D) To encrypt data Answer: B
A) A wireless communication protocol B) A WAN technology C) A family of wired networking technologies D) A type of optical fiber Answer: C Explanation: Ethernet refers to a set of wired networking technologies used mainly in LANs. Question 12. Which IEEE standard defines Ethernet? A) 802. B) 802. C) 802.1X D) 802. Answer: B Explanation: IEEE 802.3 is the standard for Ethernet networking. Question 13. What is a MAC address? A) A logical address used in Layer 3 B) A unique physical address assigned to network interfaces C) An IPv6 address D) A VLAN identifier Answer: B Explanation: A MAC address is a unique identifier assigned to a network interface card, used at Layer 2. Question 14. How many bits are in a MAC address? A) 16 B) 32 C) 48 D) 64 Answer: C
Explanation: MAC addresses are 48 bits in length. Question 15. What is the main reason for deploying switches in a network? A) To provide wireless connectivity B) To reduce collision domains C) To assign IP addresses D) To route packets Answer: B Explanation: Switches break up collision domains, improving network efficiency. Question 16. How does a switch forward frames it receives? A) By using destination IP addresses B) By broadcasting to all ports C) By referencing its MAC address table D) By encrypting the data Answer: C Explanation: Switches use their MAC address table to forward frames only to the appropriate port. Question 17. What is a broadcast domain? A) A group of devices that receive broadcast frames from each other B) A group of devices connected by a physical cable C) All devices in a VLAN D) All devices on the Internet Answer: A Explanation: Broadcast domains are groups where any broadcast sent is received by all members. Question 18. What is a collision domain? A) A section of a network where packet collisions can occur B) All devices connected to a router
Question 22. What is an access port? A) A port that carries multiple VLANs B) A port assigned to a single VLAN C) A port with no VLAN assignment D) A port used only for management Answer: B Explanation: Access ports are assigned to one VLAN and carry only that VLAN’s traffic. Question 23. What problem does the Spanning-Tree Protocol (STP) solve? A) IP address duplication B) Network loops C) MAC address conflicts D) Slow network speeds Answer: B Explanation: STP prevents network loops by creating a loop-free logical topology. Question 24. How does STP prevent loops? A) By disabling unused ports B) By blocking redundant paths C) By encrypting traffic D) By reducing broadcast domains Answer: B Explanation: STP blocks certain ports to eliminate loops while maintaining redundancy. Question 25. What is Link Aggregation? A) Assigning multiple IP addresses to a single port B) Combining multiple physical connections into one logical link C) Separating VLANs
D) Blocking unused ports Answer: B Explanation: Link Aggregation groups several physical links to increase bandwidth and provide redundancy. Question 26. Which protocol automates Link Aggregation? A) RIP B) LACP C) OSPF D) STP Answer: B Explanation: LACP (Link Aggregation Control Protocol) automates the grouping of links for aggregation. Question 27. Which of the following is a private IPv4 address? A) 8.8.8. B) 192.168.1. C) 172.32.0. D) 203.0.113. Answer: B Explanation: 192.168.x.x addresses are part of the private IPv4 address space. Question 28. What is CIDR notation used for? A) MAC address assignment B) Subnetting IP addresses C) VLAN tagging D) Physical cabling Answer: B Explanation: CIDR (Classless Inter-Domain Routing) notation is used to define IP address ranges and subnetting.
C) 64 bits D) 128 bits Answer: D Explanation: IPv6 addresses are 128 bits long. Question 33. Which protocol is used for host-to-host transport in the Transport layer? A) ICMP B) TCP C) OSPF D) ARP Answer: B Explanation: TCP operates at the Transport layer, providing reliable host-to-host communication. Question 34. Which protocol is connectionless and used for low-overhead data transfer? A) TCP B) UDP C) SMTP D) FTP Answer: B Explanation: UDP is connectionless and used for simple, fast data transfer without reliability checks. Question 35. Which OSI layer is responsible for end-to-end error detection and correction? A) Network B) Presentation C) Transport D) Data Link Answer: C Explanation: The Transport layer ensures error detection and correction for end-to-end communication.
Question 36. What is the main advantage of using VLANs? A) Increased broadcast traffic B) Logical separation of network segments C) Reduced network security D) Elimination of routers Answer: B Explanation: VLANs provide logical separation, improving security and traffic management. Question 37. Which device operates at both Layer 2 and Layer 3 of the OSI model? A) Hub B) Switch C) Router D) Layer 3 Switch Answer: D Explanation: Layer 3 switches can perform both switching and routing functions. Question 38. What is the standard maximum cable length for Cat5e Ethernet? A) 10 meters B) 50 meters C) 100 meters D) 200 meters Answer: C Explanation: The maximum recommended length for Cat5e Ethernet is 100 meters. Question 39. What type of fiber optic cable is most commonly used for long-distance networking? A) Single-mode B) Multi-mode C) Coaxial D) UTP
A) ICMP
B) ARP
C) DNS
D) DHCP
Answer: B Explanation: The Address Resolution Protocol (ARP) maps IP addresses to MAC addresses. Question 44. What is the main function of DHCP? A) Mapping MAC to IP addresses B) Dynamically assigning IP addresses to hosts C) Translating domain names to IP addresses D) Detecting network loops Answer: B Explanation: DHCP provides dynamic IP addressing for network clients. Question 45. Which protocol translates domain names to IP addresses? A) ARP B) DNS C) DHCP D) ICMP Answer: B Explanation: DNS (Domain Name System) resolves domain names to IP addresses. Question 46. Which network topology offers the highest fault tolerance? A) Bus B) Ring C) Mesh D) Star Answer: C
Explanation: Mesh topology provides multiple paths, resulting in high fault tolerance. Question 47. What is the main purpose of a router? A) To create VLANs B) To connect multiple networks C) To assign MAC addresses D) To prevent network loops Answer: B Explanation: Routers connect different networks and route packets between them. Question 48. Which of the following best describes a unicast transmission? A) One-to-one B) One-to-many C) Many-to-one D) Many-to-many Answer: A Explanation: Unicast transmissions are sent from one sender to one receiver. Question 49. Which protocol is commonly used for remote network device management? A) FTP B) SNMP C) SMTP D) OSPF Answer: B Explanation: SNMP (Simple Network Management Protocol) is used to manage and monitor network devices. Question 50. Which cable type is immune to electromagnetic interference (EMI)? A) Coaxial
Question 54. Which device is used at the edge of two different networks? A) Switch B) Router C) Hub D) Bridge Answer: B Explanation: Routers are placed at the edge to connect different networks. Question 55. What is a collision in networking? A) Two packets arriving at the same destination B) Two packets sent simultaneously on the same network segment C) A broken cable D) A failed switch Answer: B Explanation: Collisions occur when two devices transmit simultaneously on the same network segment. Question 56. Which cable type uses RJ45 connectors? A) Coaxial B) Twisted pair (Ethernet) C) Fiber optic D) Serial Answer: B Explanation: RJ45 connectors are used for Ethernet twisted pair cables. Question 57. What type of address is FF00::/8 in IPv6? A) Unicast B) Anycast C) Multicast
D) Link-local Answer: C Explanation: FF00::/8 is the prefix for IPv6 multicast addresses. Question 58. What is the default administrative distance of a directly connected route in a router? A) 1 B) 90 C) 110 D) 120 Answer: A Explanation: Directly connected routes have an administrative distance (AD) of 1. Question 59. Which command can display the routing table on a Windows computer? A) ipconfig B) netstat - r C) ping D) nslookup Answer: B Explanation: 'netstat - r' displays the routing table on a Windows system. Question 60. What is the main difference between TCP and UDP? A) TCP is faster B) TCP provides reliability, UDP does not C) UDP is connection-oriented D) UDP is only used for file transfers Answer: B Explanation: TCP is reliable and connection-oriented; UDP is unreliable and connectionless. Question 61. Which layer of the OSI model is responsible for physical addressing?
Explanation: fe80::/10 is the prefix for link-local IPv6 addresses. Question 65. What device is used to reduce broadcast traffic by dividing a network into segments? A) Repeater B) Hub C) Switch D) Bridge Answer: D Explanation: Bridges divide networks into segments, reducing broadcast traffic. Question 66. What is the purpose of the ARP cache? A) Store IP addresses B) Store MAC-to-IP mappings C) Store DNS records D) Store routing information Answer: B Explanation: The ARP cache holds mappings of IP addresses to MAC addresses for faster communication. Question 67. Which protocol is used to assign IP addresses on a network? A) ARP B) ICMP C) DHCP D) SNMP Answer: C Explanation: DHCP (Dynamic Host Configuration Protocol) assigns IP addresses dynamically. Question 68. What is an example of a Class A private IP address? A) 10.0.0. B) 172.32.0.
C) 192.168.0.
D) 224.0.0.
Answer: A Explanation: 10.0.0.0 – 10.255.255.255 is the private Class A address range. Question 69. What is the function of NAT (Network Address Translation)? A) Encrypt network data B) Map private IP addresses to public IP addresses C) Assign MAC addresses D) Create VLANs Answer: B Explanation: NAT translates private IP addresses to public addresses for Internet access. Question 70. Which protocol allows secure remote access to network devices? A) FTP B) Telnet C) SSH D) HTTP Answer: C Explanation: SSH (Secure Shell) provides secure, encrypted remote access. Question 71. Which of the following is a Layer 2 protocol? A) OSPF B) IP C) Ethernet D) TCP Answer: C Explanation: Ethernet operates at Layer 2 of the OSI model.
