Telecommunications and Wireless
Communications WGU D413: Practice Exam
(Set 2) Exam Questions with Correct
DETAILED ANSWERs and Explanations.
1. A company is expanding its office space and needs to add network cabling. The
primary requirements are support for speeds up to 10 Gbps, immunity to
electromagnetic interference from nearby heavy machinery, and the ability to
span a distance of 550 meters for backbone connections. Which cable type is
the most suitable choice?
• A) Cat6a UTP (Unshielded Twisted Pair)
• B) Multimode Fiber Optic Cable
• C) Single-mode Fiber Optic Cable
• D) Cat8 Shielded Twisted Pair (STP)
Correct DETAILED ANSWER: B) Multimode Fiber Optic Cable
Explanation:
• Why B is correct: The key constraint is the 550-meter distance. At 10
Gbps, Cat6a UTP is limited to 100 meters, making option A unsuitable. Cat8
STP is also limited to a 30-meter reach at its top speeds. This makes fiber
the necessary medium. While single-mode fiber (C) supports vastly longer
distances (up to 40 km+), it uses more expensive laser-based transceivers,
which is overkill for a short 550 m intra-campus backbone. Multimode fiber
(B) with VCSEL-based optics is specifically designed and cost-optimized for
, distances up to 550 meters (with OM4 standard) at 10 Gbps. Its inherent
immunity to electromagnetic interference (EMI) perfectly addresses the
machinery requirement.
• Incorrect options summarized:
o A: Distance limitation of 100 meters.
o C: Technically works but economically incorrect; single-mode is for
long-haul (WAN) distances.
o D: Distance limitation of 30 meters for 25/40 Gbps; not optimized
for 550 m backbone.
2. A network technician is deploying a new mesh Wi-Fi system in a home. The
system uses a wireless backhaul on the 5 GHz band between the router and a
satellite node, while client devices connect on both 2.4 GHz and 5 GHz. Which
802.11 standard's amendment is most critical for efficiently managing the
communication with client devices across the two different frequency bands
without requiring a new SSID upon steering?
• A) 802.11k (Radio Resource Measurement)
• B) 802.11v (Wireless Network Management)
• C) 802.11r (Fast Basic Service Set Transition)
• D) 802.11ax (High Efficiency Wireless)
Correct DETAILED ANSWER: B) 802.11v (Wireless Network Management)
Explanation:
• Why B is correct: 802.11v is the standard for exchanging network
information to optimize performance. Its critical capability is BSS (Basic
Service Set) Transition Management. This allows the network to send a
Communications WGU D413: Practice Exam
(Set 2) Exam Questions with Correct
DETAILED ANSWERs and Explanations.
1. A company is expanding its office space and needs to add network cabling. The
primary requirements are support for speeds up to 10 Gbps, immunity to
electromagnetic interference from nearby heavy machinery, and the ability to
span a distance of 550 meters for backbone connections. Which cable type is
the most suitable choice?
• A) Cat6a UTP (Unshielded Twisted Pair)
• B) Multimode Fiber Optic Cable
• C) Single-mode Fiber Optic Cable
• D) Cat8 Shielded Twisted Pair (STP)
Correct DETAILED ANSWER: B) Multimode Fiber Optic Cable
Explanation:
• Why B is correct: The key constraint is the 550-meter distance. At 10
Gbps, Cat6a UTP is limited to 100 meters, making option A unsuitable. Cat8
STP is also limited to a 30-meter reach at its top speeds. This makes fiber
the necessary medium. While single-mode fiber (C) supports vastly longer
distances (up to 40 km+), it uses more expensive laser-based transceivers,
which is overkill for a short 550 m intra-campus backbone. Multimode fiber
(B) with VCSEL-based optics is specifically designed and cost-optimized for
, distances up to 550 meters (with OM4 standard) at 10 Gbps. Its inherent
immunity to electromagnetic interference (EMI) perfectly addresses the
machinery requirement.
• Incorrect options summarized:
o A: Distance limitation of 100 meters.
o C: Technically works but economically incorrect; single-mode is for
long-haul (WAN) distances.
o D: Distance limitation of 30 meters for 25/40 Gbps; not optimized
for 550 m backbone.
2. A network technician is deploying a new mesh Wi-Fi system in a home. The
system uses a wireless backhaul on the 5 GHz band between the router and a
satellite node, while client devices connect on both 2.4 GHz and 5 GHz. Which
802.11 standard's amendment is most critical for efficiently managing the
communication with client devices across the two different frequency bands
without requiring a new SSID upon steering?
• A) 802.11k (Radio Resource Measurement)
• B) 802.11v (Wireless Network Management)
• C) 802.11r (Fast Basic Service Set Transition)
• D) 802.11ax (High Efficiency Wireless)
Correct DETAILED ANSWER: B) 802.11v (Wireless Network Management)
Explanation:
• Why B is correct: 802.11v is the standard for exchanging network
information to optimize performance. Its critical capability is BSS (Basic
Service Set) Transition Management. This allows the network to send a
