WGU D315 Network & Security Foundations – 100% PASS GUARANTEED | 100 OA Questions + Verified Answers + Detailed Rationales | 2026 UPDATED

,WGU D315 – Network and Security Foundations 100-Question Objective
Assessment (Full Q&A + Rationales) | 2026 Updated | 100% Correct.



🔹 SECTION 1: NETWORK FUNDAMENTALS (Q1–20)


1. What is the primary purpose of a computer network?

A. To store data locally
B. To share resources and data between devices
C. To increase CPU performance
D. To encrypt data

Answer: B
Explanation: Networks allow devices to communicate and share resources like files, printers,
and internet access.



2. Which topology connects all devices to a central hub or switch?

A. Mesh
B. Bus
C. Star
D. Ring

Answer: C
Explanation: In a star topology, all nodes connect to a central device.



3. What does LAN stand for?

A. Local Area Network
B. Logical Access Network
C. Large Area Network
D. Link Access Node

Answer: A
Explanation: LAN refers to a network within a limited geographic area.

,4. Which device operates at Layer 2 of the OSI model?

A. Router
B. Switch
C. Hub
D. Firewall

Answer: B
Explanation: Switches operate at Layer 2 (Data Link Layer).



5. What protocol is used to assign IP addresses automatically?

A. DNS
B. HTTP
C. DHCP
D. FTP

Answer: C
Explanation: DHCP dynamically assigns IP addresses to devices.



6. What is the function of DNS?

A. Encrypt data
B. Translate domain names to IP addresses
C. Assign MAC addresses
D. Manage bandwidth

Answer: B
Explanation: DNS resolves domain names into IP addresses.



7. Which topology provides redundancy by connecting every device to every
other device?

A. Star
B. Mesh
C. Bus
D. Hybrid

Answer: B
Explanation: Mesh topology ensures high redundancy.

, 8. What is a MAC address?

A. Logical address
B. Physical hardware address
C. IP address
D. Port number

Answer: B
Explanation: MAC addresses uniquely identify network interfaces.



9. What layer of OSI handles routing?

A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 7

Answer: B
Explanation: Network layer (Layer 3) handles routing.



10. Which device forwards data based on IP addresses?

A. Switch
B. Hub
C. Router
D. Bridge

Answer: C
Explanation: Routers use IP addresses to direct traffic.



11. What is a WAN?

A. Small network
B. Wide geographic network
C. Wireless device
D. Security protocol

Answer: B