(a) Assume a Sliding Window with Go-Back N ARQ is being used on a transmission link with a 3-bit sequence number. The transmitter has previously sent frames with sequence numbers 0, 1 and 2. Is the transmitter allowed to send a frame with sequence number 3 if the frame with sequence number 2 has not been acknowledged? Explain your answer.
(b) Assume a Sliding Window with Go-Back N ARQ is being used on a transmission link with a 3-bit sequence number. 1. If the transmitter sends frames 0, 1, 2, and 3, how many more frames can be sent without an acknowledgment returned by the receiver? 2. If the receiver sends back ACK 2, how many more frames can be sent? What are their frame numbers?
(c) Assume a Sliding Window with Selective-Reject ARQ is being used on a transmission link with a 3-bit sequence number. Host A sends frames 0, 1, and 2 to Host B and frame 0 is lost. 1. How many more frames can be received by Host B? 2. What would be the frame number in the Select Rej frame sent back by Host B?
(a) Assume a Sliding Window with Go-Back N ARQ is being used on a transmission link...
please answer the question clearly. Sliding window protocol with window size of 7 frames are used between the data link layers of machines A and B. Assume that machine B sends an ACK (acknowledgement) for every frame it receives without error, and it sends a NAK (negative acknowledgement) for every frame it receives with error. This corresponds to a receiver window size of 1 frame. Assume also that no frames are lost in the transmission medium. For the scenario shown...
(a) In a sliding window protocol with RWS=SWS=5, a very large set of possible sequence numbers (assume no wrapping), and in-order packet arrivals, why can the receiver be assured -3- that it will never again receive the frame with sequence number 10 if it is currently expecting frame 17? (b) For the sliding window protocol, if the sender’s window size (SWS) equals the receiver’s window size (RWS), what is the minimum number of sequence numbers that are required? How many...
The question has parts: a,b,c,d and e. Intro. To Telecommunications Assign#4 (d) Suppose the same situation as above but sender and receiver use Selective Repeat ARQ What frame(s) would the sender need to retransmit? Explain. 1. Suppose that a sender and a receiver are using ARQ to perform reliable data delivery. (a) In a Go-Back-N ARQ protocol, the window size is 6. Frames with sequence numbers 1, 2, 3, 4 and 5 have been sent. The sender just received an...
Layout the time flow diagram for both Go-Back-N and Selective Repeat ARQ mechanism in the following given scenario. Sender Receiver A B Frame o ACK 1 Frame 1 ACK 2 Frame 2 Lost Frame 3 ACK 3 ACK 4 Time Time
Consider a Go-Back-N protocol with a sender window size of 5 and a sequence number range of 1,024, and assume the receiver sends ACKs with the number of the next sequence number expected. Suppose that at time t, the next in-order packet that the receiver is expecting is a packet with the sequence number 8. Assume that the channel does not reorder packets. (a) What are the possible sets of sequence numbers inside the sender’s window at time t? Justify...
25. Suppose you are designing a sliding window protocol for a 1-Mbps point-to-point link to the stationary satellite evolving around the Earth at an altitude of 3 x 104 km. Assuming that each frame carries 1 KB of data, what is the minimum number of bits you need for the sequence number in the following cases? Assume the speed of light is 3 x 108 m/s. (a) RWS-1 (b) RWS-SWS
(a) A data link with a 1 Gigabits/sec capacity is used to transmit packets made up of 1400 bytes of data and 100 bytes of protocol control information. Each packet is acknowledged by a short frame of size 150 bytes. The propagation speed in the transmission medium is 200,000 km/sec. Consider the buffering and processing time in the nodes to be negligible. A node A communicates with a node B, with a distance between nodes A and B of 16...
The next three questions are related to the local area network shown below. In this network computers attached to links 1 & 2 send data to the server attached to link 3. The three devices are connected through a router. Link 1 Link 2 Link 3 Following parameters of the network have been provided. Propagation delay in link 1-138 micro seconds Propagation delay in link 2-309 micro seconds Propagation delay in link 3-216 micro seconds Frame size 1432 bytes ACK...
PLEASE HELP WITH THESE COMPUTER NETWORK QUESTIONS THESE INCLUDE MCQS AND CALCULATIONS With reference to the Go-Back-N and Selective repeat protocols, what does the window value signify? The packets that have already been ACKed The packets sent but remain unACKed The sequence numbers available and not yet sent The sequence numbers of packets not yet available None of the above 1 points QUESTION 2 Which of the following is NOT a component of the TCP congestion control algorithm? Slow...
Computer Networks help: True/False questions and a reason (if applicable) as to why it is true or flase: 1. The TCP receiver sends an acknowledgment of sequence number n if it has correctly received byte n. T/F 2. The main motivation of TCP flow control at the sender is to avoid network congestion. T/F 3. When losses are present, Selective Repeat schemes are more efficient than Go-Back-N schemes. T/F 4. Congestion control can be implemented on an end-to-end basis or...