WGU D413 Telecommunications & Wireless Communications Full Practice Exam (200 Q&A with Rationales) 2026-202

WGU D413 – Telecommunications & Wireless
Communications
FULL PRACTICE EXAM – 200 QUESTIONS
With Clear Rationales for Every Answer Newest 2026-
2027.




1. Which OSI layer handles cabling and signaling?

• A. Physical

• B. Data Link

• C. Network

• D. Transport

Correct Answer: A. Physical

Rationale: The Physical layer is responsible for cables, voltages, and signal transmission.



2. Which OSI layer uses MAC addresses?

• A. Network

• B. Transport

• C. Data Link

• D. Session

Correct Answer: C. Data Link

Rationale: MAC addressing occurs at the Data Link layer (Layer 2).



3. Which protocol automatically assigns IP addresses?

• A. DNS

• B. FTP

,• C. DHCP

• D. SNMP

Correct Answer: C. DHCP

Rationale: DHCP dynamically assigns IP addresses and configuration information.

,4. Which device forwards frames using MAC addresses?

• A. Router

• B. Switch

• C. Repeater

• D. Firewall

Correct Answer: B. Switch

Rationale: Switches use MAC address tables to forward frames within a LAN.



5. Which transmission medium is immune to EMI?

• A. UTP

• B. Coaxial

• C. Fiber-optic

• D. Wireless

Correct Answer: C. Fiber-optic

Rationale: Fiber-optic cable uses light instead of electricity, making it immune to EMI.



6. Which protocol resolves hostnames to IP addresses?

• A. FTP

• B. DNS

• C. DHCP

• D. SMTP

Correct Answer: B. DNS

Rationale: DNS translates domain names into IP addresses.



7. Which wireless frequency band has less interference?

• A. 2.4 GHz

• B. 5 GHz

• C. 900 MHz

• D. Infrared

Correct Answer: B. 5 GHz

, Rationale: The 5 GHz band has more channels and less congestion.



8. Which wireless security protocol is the most secure?

• A. WEP