Communication Systems Revision Set 3

2.

Which of the following terms best describes a private WAN connecting a company's various offices?

Intranet
Extranet
Internet
PSTN

Correct Answer

A. PSTN

Explanation

A private WAN connecting a company's various offices is best described as a PSTN (Public Switched Telephone Network). The PSTN is a global network of interconnected telephone lines and equipment that allows for the transmission of voice and data signals. In this context, the company's offices would be connected through dedicated telephone lines, ensuring a secure and private connection between them.

Rate this question:

3.

The PSTN is currently used for audio in many teleconferences because:

Voice quality is better on a connectionless network
Currently multicasting is not widely implemented on the Internet
Circuit switched networks provide higher levels of security
Voice quality is better on a connection-based network

Correct Answer

A. Voice quality is better on a connectionless network

4.

When participants are widely dispersed, which of the following is an advantage of teleconferencing systems compared to face-to-face meetings?

Ability to develop personal relationships is enhanced
Specialised information technology is required
Significant savings in terms of money and time
All of the above

Correct Answer

A. Significant savings in terms of money and time

Explanation

Teleconferencing systems offer the advantage of significant savings in terms of money and time compared to face-to-face meetings. This is because participants do not need to travel to a specific location, which eliminates the need for transportation costs and reduces the time spent on commuting. Additionally, teleconferencing allows for more efficient scheduling, as participants can join the meeting from their own locations, eliminating the need to coordinate travel arrangements. Overall, this advantage makes teleconferencing a cost-effective and time-saving option for widely dispersed participants.

Rate this question:

5.

Which of the following is TRUE for PSTN based audio conferences?

Each participant has a different circuit
Audio from each participant is transferred as a sequence of packets
All participants share a single circuit
Each participant must use a dedicated conference phone

Correct Answer

A. All participants share a single circuit

Explanation

In PSTN based audio conferences, all participants share a single circuit. This means that the audio from each participant is transmitted over the same circuit, allowing them to communicate with each other. Unlike digital audio conferences where the audio is transferred as packets, in PSTN conferences, the audio is transmitted over a single circuit, which may result in limitations such as lower audio quality or limited capacity for simultaneous participants.

Rate this question:

6.

The purpose of a streaming video server is:

To adjust the quality of the video stream sent to each participant based on their transmission speed
To transmit identical streams of video to all conference participants
To ensure a continuous connection between all participants is maintained
To connect and disconnect participants as they enter and leave the conference

Correct Answer

A. To adjust the quality of the video stream sent to each participant based on their transmission speed

Explanation

A streaming video server adjusts the quality of the video stream sent to each participant based on their transmission speed. This means that participants with slower internet connections will receive a lower quality video stream to prevent buffering or interruptions, while participants with faster connections will receive a higher quality stream for a better viewing experience. This ensures that all participants can watch the video smoothly, regardless of their internet capabilities.

Rate this question:

7.

With regard to the video received during a videoconference, which of the following is TRUE?

All participants in a video conference must receive video of identical quality
The quality can never exceed that of the collected video
The codec used by the sender can be different to the codec used by the receivers
Video quality decreases as transmission rates increase

Correct Answer

A. The quality can never exceed that of the collected video

Explanation

The statement "The quality can never exceed that of the collected video" means that the video quality in a video conference is limited by the quality of the original video that was collected. This implies that even if the participants have high-quality devices or connections, the video quality cannot be better than what was initially captured. This is because the video conference system relies on the collected video as its source, and any limitations or imperfections in that original video will be carried over to the video conference.

Rate this question:

8.

When IP multicast is used, which of the following occurs?

Each participant receives the same stream
Each participant receives their own stream
A dedicated streaming server is defiantly required
Video cannot be sent from multiple locations

Correct Answer

A. Each participant receives the same stream

Explanation

When IP multicast is used, each participant in the multicast group receives the same stream of data. This means that a single stream is sent from the source and is replicated by the network to reach all the intended recipients. This allows for efficient distribution of data to multiple recipients without the need for separate streams for each participant. It eliminates the need for a dedicated streaming server and enables video transmission from multiple locations.

Rate this question:

9.

Teleconferencing can best be described as:

Synchronous and simplex
Asynchronous and full duplex
Asynchronous and simplex
Synchronous and full duplex

Correct Answer

A. Synchronous and full duplex

Explanation

Teleconferencing refers to a communication method that allows individuals or groups to interact in real-time, regardless of their physical locations. It involves the exchange of information in both directions simultaneously, making it synchronous. Additionally, teleconferencing enables participants to communicate using both audio and video, allowing for a two-way flow of information, which makes it full duplex. Therefore, the correct answer is "synchronous and full duplex."

Rate this question:

10.

Which list contains devices used to collect data during teleconferences?

Phone, monitor, keyboard, mouse
Speakers, monitors, headsets, projectors
Phone, video camera, document camera, keyboard, mouse
Video camera, document camera, speakers, scanners

Correct Answer

A. Phone, video camera, document camera, keyboard, mouse

Explanation

The correct answer is "Phone, video camera, document camera, keyboard, mouse." During teleconferences, data can be collected using various devices. A phone is used for audio communication, a video camera is used to capture video footage, a document camera is used to display documents or objects, and a keyboard and mouse are used to input and control data on a computer or other devices.

Rate this question:

Communication Systems Revision Set 3

During a telephone call over the PSTN, which of the following is TRUE?

Quiz Preview

Which of the following terms best describes a private WAN connecting a company's various offices?

The PSTN is currently used for audio in many teleconferences because:

When participants are widely dispersed, which of the following is an advantage of teleconferencing systems compared to face-to-face meetings?

Which of the following is TRUE for PSTN based audio conferences?

The purpose of a streaming video server is:

With regard to the video received during a videoconference, which of the following is TRUE?

When IP multicast is used, which of the following occurs?

Teleconferencing can best be described as:

Which list contains devices used to collect data during teleconferences?