WGU D413 OBJECTIVE ASSESSMENT 2 LATEST 2026 ACTUAL EXAM TEST BANK| D413 TELECOMM AND WIRELESS Exam

WGU D413 OBJECTIVE
ASSESSMENT 2 LATEST 2026
ACTUAL EXAM TEST BANK| D413
TELECOMM AND WIRELESS
EXAM


1. Which OSI layer is responsible for reliable data delivery?

 A. Network
 B. Transport
 C. Data Link
 D. Physical
o Answer: B — Transport
o Rationale: Layer 4 (Transport) manages error detection,
retransmission, flow control, and segmentation (e.g., TCP).

2. Which factor most directly affects wireless signal
attenuation in indoor environments?

 A. Modulation type
 B. Physical obstacles like walls
 C. IP addressing scheme
 D. MAC address filtering
o Answer: B — Physical obstacles like walls

, o Rationale: Walls, metal, and concrete absorb or reflect RF
signals, reducing signal strength. This is one of the biggest
real-world factors in wireless performance.

3. What is the main advantage of packet switching over
circuit switching?

 A. Higher security
 B. Dedicated path for data
 C. Efficient bandwidth usage
 D. Lower latency
o Answer: C — Efficient bandwidth usage
o Rationale: Packet switching sends data only when needed,
unlike circuit switching which reserves a full path even when
idle.

4. Why does 5 GHz Wi-Fi typically provide higher data rates
than 2.4 GHz?

 A. Lower frequency waves travel faster
 B. It uses more power
 C. It has wider available channels and less interference
 D. It penetrates walls better
o Answer: C — Wider channels and less interference
o *Rationale: 5 GHz offers more non-overlapping channels and
wider bandwidth (e.g., 40/80/160 MHz), allowing higher
throughput.*

5. What is the primary purpose of modulation in wireless
communication?

 A. Encrypt data

,  B. Convert digital signals into radio waves
 C. Assign IP addresses
 D. Route packets
o Answer: B — Convert digital signals into radio waves
o Rationale: Modulation encodes data onto a carrier wave so it
can be transmitted over the air.

6. Which cable type is MOST resistant to electromagnetic
interference?

 A. Coaxial
 B. Twisted pair
 C. Fiber optic
 D. Shielded twisted pair
o Answer: C — Fiber optic
o Rationale: Fiber transmits light, not electrical signals, making it
immune to EMI and crosstalk.

7. Which WAN technology uses labeled paths for traffic
prioritization?

 A. Frame Relay
 B. ATM
 C. MPLS
 D. ISDN
o Answer: C — MPLS
o Rationale: MPLS forwards packets based on labels, not IP
lookups, enabling QoS and traffic engineering.

8. Which wireless security protocol is MOST secure?

,  A. WEP
 B. WPA
 C. WPA2
 D. WPA3
o Answer: D — WPA3
o *Rationale: WPA3 provides the highest level of modern
wireless security, improving encryption and protecting
against brute-force attacks.*

9. What is the function of a RADIUS server in a wireless
network?

 A. To extend the range of access points
 B. To provide authentication for users connecting to the
network
 C. To assign IP addresses to clients
 D. To encrypt all wireless traffic
o Answer: B — To provide authentication for users
connecting to the network
o Rationale: RADIUS (Remote Authentication Dial-In User
Service) provides centralized authentication, authorization, and
accounting for network access.

10. Which networking feature prioritizes time-sensitive
packets traveling across the network?

 A. Subnet mask
 B. VLAN
 C. Quality of Service (QoS)
 D. NAT
o Answer: C — Quality of Service (QoS)