ICC Network Fundamentals 3 — Questions and Answers
Question 1: Which network device operates at Layer 2 of the OSI model and uses MAC addresses to forward frames?
- Router
- Switch (Correct answer)
- Hub
- Repeater
Correct answer: Switch
A switch operates at Layer 2 (Data Link) and maintains a MAC address table to intelligently forward frames only to the appropriate destination port.
Question 2: What type of transmission sends data to all devices on a network segment simultaneously?
- Unicast
- Multicast
- Broadcast (Correct answer)
- Anycast
Correct answer: Broadcast
A broadcast transmission sends a single packet to all devices within the broadcast domain, using the destination address 255.255.255.255 for IPv4.
Question 3: In subnetting, what is the purpose of the subnet mask?
- To encrypt network traffic
- To distinguish the network portion from the host portion of an IP address (Correct answer)
- To assign MAC addresses to interfaces
- To prioritize network traffic
Correct answer: To distinguish the network portion from the host portion of an IP address
The subnet mask identifies which bits of an IP address represent the network and which represent the host, enabling routers to determine if a destination is local or remote.
Question 4: Which wireless security protocol is considered the most secure for modern Wi-Fi networks?
- WEP
- WPA
- WPA2
- WPA3 (Correct answer)
Correct answer: WPA3
WPA3 is the most current and secure Wi-Fi security protocol, offering stronger encryption and protection against brute-force attacks compared to its predecessors.
Question 5: What is the function of the Address Resolution Protocol (ARP)?
- Resolves domain names to IP addresses
- Maps IP addresses to MAC addresses (Correct answer)
- Assigns IP addresses dynamically
- Routes packets between networks
Correct answer: Maps IP addresses to MAC addresses
ARP resolves a known IPv4 address to the corresponding MAC address so that data frames can be delivered on the local network segment.
Question 6: Which port number is used by HTTPS for secure web traffic?
- 80
- 110
- 443 (Correct answer)
- 8080
Correct answer: 443
HTTPS uses TCP port 443 to provide encrypted communication between web browsers and servers using TLS/SSL.
Question 7: What is the primary advantage of fiber optic cable over copper cable for network infrastructure?
- Lower cost per foot
- Immunity to electromagnetic interference and greater transmission distances (Correct answer)
- Easier to terminate and splice
- Compatible with all legacy network equipment
Correct answer: Immunity to electromagnetic interference and greater transmission distances
Fiber optic cable transmits data as light pulses, making it immune to EMI/RFI and capable of carrying signals over much longer distances than copper with minimal attenuation.
ICC Network Fundamentals 3
Which network device operates at Layer 2 of the OSI model and uses MAC addresses to forward frames?