VDV Network Systems Integration 3 — Questions and Answers
Question 1: Which wireless frequency band typically provides longer range but lower throughput compared to 5 GHz?
- 2.4 GHz (Correct answer)
- 6 GHz
- 900 MHz
- 60 GHz
Correct answer: 2.4 GHz
The 2.4 GHz band propagates farther and penetrates walls better than 5 GHz but offers fewer non-overlapping channels and lower maximum data rates.
Question 2: In a VoIP system, what is the recommended maximum one-way latency for acceptable voice quality?
- 50 ms
- 150 ms (Correct answer)
- 300 ms
- 500 ms
Correct answer: 150 ms
ITU-T G.114 recommends a maximum one-way delay of 150 ms for acceptable voice quality in VoIP communications.
Question 3: What type of network topology connects each device directly to a central hub or switch?
- Bus
- Ring
- Star (Correct answer)
- Mesh
Correct answer: Star
In a star topology, all devices connect to a central switch or hub, making troubleshooting easier since a failed link only affects one device.
Question 4: Which standard governs the installation of structured cabling systems in commercial buildings in the United States?
- IEC 61300
- TIA-568 (Correct answer)
- IEEE 802.3
- ANSI/BICSI 002
Correct answer: TIA-568
TIA-568 (Telecommunications Cabling Standard) specifies requirements for structured cabling systems in commercial buildings, including cable types, connectors, and installation practices.
Question 5: When integrating a new IP camera into an existing network, what feature allows the switch port to supply power to the camera without a separate power supply?
- VLAN
- STP
- PoE (Correct answer)
- QoS
Correct answer: PoE
Power over Ethernet (PoE) delivers electrical power through Ethernet cables, eliminating the need for separate power supplies for IP cameras and other devices.
Question 6: What is the function of a patch panel in a structured cabling system?
- It boosts signal strength between floors
- It converts fiber to copper signals
- It provides a centralized termination point for horizontal cabling (Correct answer)
- It assigns IP addresses to connected devices
Correct answer: It provides a centralized termination point for horizontal cabling
A patch panel provides a centralized point where horizontal cabling from work areas terminates, allowing flexible cross-connections using patch cords in the telecommunications room.
Question 7: Which OSI layer is responsible for end-to-end error recovery and flow control in network communications?
- Layer 2 (Data Link)
- Layer 3 (Network)
- Layer 4 (Transport) (Correct answer)
- Layer 5 (Session)
Correct answer: Layer 4 (Transport)
The Transport layer (Layer 4) provides end-to-end communication services including reliable data transfer, error recovery, and flow control using protocols like TCP.
VDV Network Systems Integration 3
Which wireless frequency band typically provides longer range but lower throughput compared to 5 GHz?