CIW Network Technology Associate 2 — Questions and Answers
Question 1: Which OSI layer is responsible for end-to-end error detection and flow control between two hosts?
- Network layer
- Data Link layer
- Transport layer (Correct answer)
- Session layer
Correct answer: Transport layer
The Transport layer (Layer 4) handles end-to-end error detection, flow control, and reliable delivery between hosts.
Question 2: What is the purpose of the Spanning Tree Protocol (STP) in a switched network?
- Encrypt traffic between switches
- Prevent routing loops by blocking redundant paths (Correct answer)
- Assign IP addresses to network devices
- Prioritize voice traffic over data traffic
Correct answer: Prevent routing loops by blocking redundant paths
STP prevents Layer 2 switching loops by placing redundant switch ports in a blocking state, keeping one active path.
Question 3: A network administrator wants to limit broadcast domains without using a router. Which technology should be used?
- Hub
- Repeater
- VLAN (Correct answer)
- Bridge
Correct answer: VLAN
VLANs (Virtual Local Area Networks) logically segment a network at Layer 2, creating separate broadcast domains on the same physical switch.
Question 4: Which IPv4 address class is designed for multicast communications?
- Class A
- Class B
- Class C
- Class D (Correct answer)
Correct answer: Class D
Class D addresses (224.0.0.0–239.255.255.255) are reserved for multicast group communications.
Question 5: What does the acronym NAT stand for, and what problem does it primarily solve?
- Network Access Terminal — improves wireless speed
- Network Address Translation — allows multiple private hosts to share a single public IP (Correct answer)
- Node Authentication Token — secures remote logins
- Network Allocation Table — manages DHCP leases
Correct answer: Network Address Translation — allows multiple private hosts to share a single public IP
NAT (Network Address Translation) maps private internal IP addresses to one or more public IP addresses, conserving the limited IPv4 address space.
Question 6: Which protocol operates at Layer 3 of the OSI model and is responsible for logical addressing and routing?
- Ethernet
- IP (Correct answer)
- TCP
- ARP
Correct answer: IP
IP (Internet Protocol) operates at the Network layer (Layer 3) and handles logical addressing and packet routing between networks.
Question 7: In subnetting, what is the function of a subnet mask?
- Encrypt the network portion of an IP address
- Identify which bits of an IP address represent the network and which represent hosts (Correct answer)
- Assign dynamic IP addresses to hosts
- Filter incoming packets based on port numbers
Correct answer: Identify which bits of an IP address represent the network and which represent hosts
A subnet mask uses binary ones to mark the network portion and binary zeros to mark the host portion of an IP address.
CIW Network Technology Associate 2
Which OSI layer is responsible for end-to-end error detection and flow control between two hosts?