WGU D419 – Implementing and Administering Networking Solutions | Objective Assessments | OA | Questions and Answers | 2026 Update | 100% Correct.

WGU D419 – Implementing and Administering Networking Solutions |
Objective Assessments | OA | Questions and Answers | 2026 Update |
100% Correct.




WGU D419 – MOCK OBJECTIVE
ASSESSMENT
Time Limit: 90 minutes
Total Questions: 70
Target to Pass: ≥ (~70%)




SECTION 1: Networking Fundamentals (1–8)
1. What is the primary function of a LAN?
A. Connect devices over long distances
B. Provide internet access only
C. Connect devices within a limited geographic area
D. Replace WAN connections



2. Which network type spans multiple cities or countries?
A. LAN
B. MAN
C. WAN
D. PAN



3. What does bandwidth measure?
A. Network delay
B. Data transfer capacity
C. Signal interference
D. Packet loss

,4. High latency will MOST likely cause which issue?
A. Increased throughput
B. Faster downloads
C. Delayed communication
D. Improved reliability



5. Which device forwards traffic using MAC addresses?
A. Router
B. Switch
C. Firewall
D. Modem



6. Which device routes traffic between different IP networks?
A. Switch
B. Hub
C. Router
D. Access point



7. What is the primary role of a firewall?
A. Assign IP addresses
B. Encrypt wireless traffic
C. Filter network traffic
D. Route packets



8. Which device allows wireless clients to access a wired LAN?
A. Router
B. Switch
C. Wireless access point
D. Modem




SECTION 2: OSI & TCP/IP Models (9–18)
9. How many layers are in the OSI model?
A. 4
B. 5

,C. 6
D. 7



10. Which OSI layer is responsible for routing?
A. Transport
B. Network
C. Data Link
D. Session



11. Which OSI layer uses MAC addresses?
A. Physical
B. Data Link
C. Network
D. Transport



12. Which OSI layer handles encryption and compression?
A. Application
B. Presentation
C. Session
D. Transport



13. Which protocol operates at the Transport layer and ensures reliable delivery?
A. UDP
B. IP
C. TCP
D. ICMP



14. Which TCP/IP layer corresponds to the OSI Network layer?
A. Application
B. Transport
C. Internet
D. Network Access

, 15. Ping primarily operates at which OSI layer?
A. Application
B. Transport
C. Network
D. Physical



16. Which OSI layer establishes and terminates sessions?
A. Session
B. Presentation
C. Transport
D. Application



17. Which OSI layer is responsible for error detection?
A. Physical
B. Data Link
C. Network
D. Session



18. Which OSI layer is closest to the end user?
A. Transport
B. Presentation
C. Application
D. Session




SECTION 3: IP Addressing & Subnetting (19–30)
19. How many bits are in an IPv4 address?
A. 16
B. 32
C. 64
D. 128



20. How many usable hosts exist in a /24 subnet?
A. 256
B. 255