Suppose that streaming video information is transferred from a server to a user over a packet network.Ī. Do the answers to parts (a) and (b) change if the signals arriving at the base station include e-mail and other short messages?ĩ. Are the requirements the same in the opposite direction from the telephone office to the base station?Ĭ. Suppose that each voice sample should not be delayed by more than 20 ms.ī. Suppose that a packet network is used to transfer all the voice signals that arrive at the base station of a cellular telephone network to a telephone office.
Compare a hop-by-hop approach to an end-to-end approach to meeting the requirements of the voice signal.Ĩ. Discuss which of the following adaptation functions are relevant to meeting the requirements of this transfer: handling of arbitrary message size reliability and sequencing pacing and flow control timing addressing and privacy, integrity, and authentication.ī.
Suppose that each voice sample should not be delayed by more than 20 ms.Ī. Consider the transfer of a single real-time telephone voice signal across a packet network. The bytes from the user pairs arrive sporadically and at different rates.ħ. The bytes from each user pair arrive at the same constant rate.ī. Develop an approach that allows the stream transfer service to be shared by several pairs of users in the following cases:Ī. Suppose that two peer-to-peer processes provide a service that involves the transfer of a stream of bytes. Is there a way to meet this requirement?Ħ. Suppose that the bytes arrive at a variable rate and that no byte is to be delayed by more than T seconds. Does this requirement have an impact on the efficiency?ĭ. Suppose that the bytes arrive at a constant rate and that no byte is to be delayed by more than T seconds. What is a reasonable way to balance efficiency and delay at the transmitter? What control information is required in each PDU?Ĭ. Suppose that the bytes in the stream arrive sporadically. What control information is required in each PDU?ī. Develop an approach that allows the peer processes to transfer the stream of bytes in a manner that uses the transmission line efficiently. Suppose that the peer processes are allowed to exchange PDUs that have a maximum size of M bytes, including H bytes of header.Ī. Is additional control information required, and if so, where should it be placed?ĥ. Now suppose that the message transfer service provided by the peer processes is shared by several message source-destination pairs. What essential control information needs to be exchanged between the peer processes?Ĭ. Develop an approach that allows the peer processes to exchange messages of arbitrary size.ī. Suppose that a PDU is not allowed to carry information from more than one message.Ī. Suppose that the peer processes are allowed to exchange PDUs that have a maximum size of M bytes, including H bytes of header. Suppose that two peer-to-peer processes provide a service that involves the transfer of discrete messages. What is the total number of packet transmissions required to transfer the entire message?Ĥ.
Suppose that the error recovery is carried out end to end on a packet by packet basis. How many times does the message have to be retransmitted on average?Ĭ. Suppose that error recovery is carried out end to end and that if there are any errors, the entire message is retransmitted. Find the probability that the message arrives without errors at station p.ī. Suppose that the data link control just transfers frames and does not implement error control.
0 kommentar(er)
