Question

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Question 1 2.5 pts The Internet does not perform any error detection on datagrams and leaves it to the end users. True False U Question 2 2.5 pts If a communication line has an attenuation of -10dB, a transmitted with a power of SW becomes 0.5W when it reaches the end of the line True False D Question 3 2.5 pts Flow control refers to pacing between the source and destination True False

Answer 1

Question 1)
Answer: True
The User Datagram Protocol (UDP) used to transmit data from a sender to its intended receiver is unreliable, as the receiver does not send an acknowledgment to the sender of the receiver receiving the data. Hence, even if there was a failure in the data being received, data getting lost, or due to some error, the sender would not try to detect any error as it does not get any acknowledgment of the receiver receiving the data or not receiving it. Because of this reason UDP is faster than TCP as, there is no form of flow control, no error checking, error correction, no acknowledgment mechanism provided by UDP. UDP is only concerned with speed. Hence, when the data sent over the Internet is affected by collisions, errors will be present. Especially in real-time voice and video communication, UDP is used, where there could be many errors and packet loss, however, it does not affect conversation and is not ideal for the receiver to send an acknowledge either.

Question 3)
Answer: True
The data sent in the form of a frame between the sender and a receiver over a transmission media should be transmitted and received at the same pace. In case, a frame is sent over a medium at a faster speed than the receiver’s working speed, the data received at the receiving node will be lost due to a mismatch in speed. Hence, to overcome this type of issue, a flow control mechanism is performed. Flow control is required for pacing the data transfer at an acceptable speed.

Question 6)
Answer: True
A simplex channel only allows information to flow in one direction at a given time, where data can be sent in a specified direction, however, the same data cannot be received in return.

Question 7)
Answer: True
Round-Trip-Time (RTT) is the duration of time it takes for a signal to be sent from a sender to a receiver adding the duration of time it takes for an acknowledgment of that signal sent by the receiver to be received by the sender.