A network engineer is configuring a point-to-point link between two routers on a WAN network. The link is intended to support a critical real-time application that requires continuous bidirectional data flow without any transmission delays.

Homework Help: Questions and Answers: A network engineer is configuring a point-to-point link between two routers on a WAN network. The link is intended to support a critical real-time application that requires continuous bidirectional data flow without any transmission delays. Which type of communication should the engineer configure on the point-to-point link to meet the application’s requirements?

a) Half-duplex communication, because it allows for two-way communication with a guaranteed level of bandwidth.
b) Half-duplex communication with Quality of Service (QoS) prioritization to ensure real-time data is transmitted without delay.
c) Full-duplex communication, as it supports simultaneous bidirectional data flow, which is essential for real-time applications.
d) Full-duplex communication with multiple cables to increase the bandwidth and support the high data rate required by the application.

Answer:

First, let’s understand the requirements and types of communication:

• Critical real-time application: Requires continuous bidirectional data flow without transmission delays.
• The link is point-to-point, which means it is a direct connection between two routers.

Half-duplex communication:

• Allows communication in both directions but not simultaneously.
• One device must wait for the other to finish transmitting before it can send its data.
• This can introduce delays, which is not suitable for real-time applications.

Full-duplex communication:

• Allows simultaneous communication in both directions.
• No waiting period, which ensures smooth and continuous data flow.
• This is ideal for real-time applications requiring continuous bidirectional communication.

Given Options: Step by Step Answering

a) Half-duplex communication, because it allows for two-way communication with a guaranteed level of bandwidth.

• Half-duplex communication” allows two-way communication, but it introduces delays as it does not allow simultaneous data flow.
• This is incorrect because it does not meet the requirement for simultaneous bidirectional data flow.

b) Half-duplex communication with Quality of Service (QoS) prioritization to ensure real-time data is transmitted without delay.

• “Half-duplex communication with QoS” still has the fundamental limitation of half-duplex, meaning it cannot transmit data simultaneously in both directions, leading to potential delays.
• This is incorrect for real-time bidirectional data flow.

c) Full-duplex communication, as it supports simultaneous bidirectional data flow, which is essential for real-time applications.

• “Full-duplex communication” allows for simultaneous bidirectional data flow, meeting the requirement for continuous real-time communication.
• This is correct, because as it supports the application’s need for simultaneous communication without delays.

d) Full-duplex communication with multiple cables to increase the bandwidth and support the high data rate required by the application.

• “Full-duplex communication with multiple cables” is overcomplicating the setup. A single full-duplex link is sufficient for continuous real-time communication, and adding extra cables does not necessarily address the core requirement.
• This is incorrect, since full-duplex alone is sufficient.

Final Answer

Based on the above analysis, the correct answer is:

c) Full-duplex communication, as it supports simultaneous bidirectional data flow, which is essential for real-time applications.

Full-duplex communication allows data to be sent and received simultaneously, which is crucial for the continuous bidirectional data flow required by the critical real-time application. It also minimizes transmission delays, meeting all the stated requirements.

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