D413 - Telecomm and Wireless Communications Actual Exam Questions with Correct Answers and Explanations.

D413 - Telecomm and Wireless Communications
Actual Exam Questions with Correct Answers and
Explanations.


1. What is bandwidth?

 A) The speed at which data is transferred.
 B) The maximum theoretical capacity of a network communication link.
 C) The actual throughput of a network.
 D) The number of devices on a network.

Answer: B
Explanation: Bandwidth is the maximum data transfer rate of a network path, representing
its theoretical capacity.

2. Which network topology connects all devices to a single central cable?

 A) Star
 B) Bus
 C) Ring
 D) Mesh

Answer: B
Explanation: In a bus topology, all nodes are connected to a single shared cable or
conductor.

3. Which factor is a source of industrial noise that can contribute to signal
attenuation?

 A) Fiber-optic cables
 B) The weather

, C) Electric motors
 D) Wireless access points

Answer: C
Explanation: Electric motors are a common source of electromagnetic interference, which
manifests as "noise" that degrades signals.

4. What is the maximum speed of a Cat 5e cable?

 A) 100 Mbps
 B) 1 Gbps
 C) 10 Gbps
 D) 40 Gbps

Answer: B
Explanation: Cat 5e is rated for speeds up to 1 Gbps (Gigabit Ethernet) at a maximum
length of 100 meters.

5. Which component's purpose is to extend the reach of a wireless network by
regenerating a signal?

 A) Router
 B) Gateway
 C) Repeater
 D) Bridge

Answer: C
Explanation: A repeater is a network device used to regenerate a signal to extend its
transmission distance, overcoming attenuation.

6. What is a characteristic of fiber-optic cables?

 A) They are less expensive than copper cables.
 B) They are composed of a core, cladding, a buffer, and a jacket.

, C) They are susceptible to electromagnetic interference.
 D) They are easier to install than copper cables.

Answer: B
Explanation: Fiber-optic cables transmit data using light and are composed of these layers,
each with a specific function.

7. How is "phase" defined in the context of signal transmission?

 A) The number of cycles a signal completes in one second.
 B) The maximum strength of a signal.
 C) A wave's position relative to a reference position.
 D) The loss of signal strength over distance.

Answer: C
Explanation: Phase is a measure of how far a wave cycle is offset from a reference point,
typically measured in degrees.

8. Which type of cable uses a dielectric insulator to reduce electromagnetic field
interference?

 A) Unshielded twisted-pair (UTP)
 B) Coaxial cable
 C) Fiber-optic cable
 D) Shielded twisted-pair (STP)

Answer: B
Explanation: Coaxial cables have a central conductor surrounded by a dielectric insulator,
which helps reduce interference.

9. Which type of cable is typically more fragile and contains components that can
be easily damaged?

 A) Coaxial cable

,  B) Unshielded twisted-pair (UTP)
 C) Shielded twisted-pair (STP)
 D) Fiber-optic cable

Answer: D
Explanation: Fiber-optic cables are composed of glass or plastic fibers, making them more
fragile than copper cables.

10. A network administrator needs to connect two network devices that are 150
meters apart using Cat 5e cable (which has a maximum length of 100 meters).
Which device can be used to facilitate this connection?

 A) Gateway
 B) Repeater
 C) Switch
 D) Media Converter

Answer: B
Explanation: A repeater can be placed in the middle of the 150-meter run to regenerate
the signal and allow the total distance to exceed the 100-meter limit.


Section 2: Wireless Technologies (Questions 11-20)

11. Which IEEE 802.11 wireless standard operates on both the 2.4 GHz and 5 GHz
bands and has a maximum data rate of 600 Mbps?

 A) 802.11a
 B) 802.11b
 C) 802.11g
 D) 802.11n