Suppose a TCP connection, with window size 1, loses every other packet. Those that do arrive have RTT: 1 second. What - happens? What happens to TimeOut? Do this for two cases: (a) After a packet is eventually received, we pick up where we left off, resuming with Estimated RTT initialized to its pre-timeout value, and TimeOut double that. (b) After a packet is eventually received, we resume with TimeOut initialized to the last exponentially backed-off value used for the timeout interval. In the following four exercises, the calculations involved are straightforward with a spreadsheet.

Suppose a TCP connection, with window size 1, loses every other packet. Those that do arrive have RTT: 1 second. What - happens? What happens to TimeOut? Do this for two cases: (a) After a packet is eventually received, we pick up where we left off, resuming with Estimated RTT initialized to its pre-timeout value, and TimeOut double that. (b) After a packet is eventually received, we resume with TimeOut initialized to the last exponentially backed-off value used for the timeout interval. In the following four exercises, the calculations involved are straightforward with a spreadsheet.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Packet buffering in Go-Back-N. What are some reasons for discarding received-but- out-of-sequence packets at the receiver in GBN? Indicate one or more of the following statements that are correct. Group of answer choices a.The implementation at the receiver is simpler. b.Discarding an out of sequence packet will really force the sender to retransmit. c.If some packets are in error, then its likely that other packets are in error as well. d.The sender will resend that packet in any case.
Suppose a client is communication with a server via a TCP Reno connection. The client has sent the data up to sequence number 120. The client has received acknowledgment number 80 from the server, and the received window is 50 in the last message received by the client from the server. Moreover, the client has estimated the congestion window as 36 for the server. If the client receives two more acknowledgment number 80, then how much maximum data the client can send to the server? Justify your answer via proper references and procedure. (coding required)
Consider the situation in the previous exercise, except this time assume that the router has a queue size of 1; that is, it can hold one packet in addition to the one it is sending (in each direction). Let A's timeout be 5 seconds, and let SWS again be 4. Show what happens at each second from Time=0 until all four packets from the first window-full are successfully delivered.
Suppose two TCP connections share a path through a router R. The router's queue size is six segments; each connection has a stable congestion window of three segments. No congestion control is used by these connections. A third TCP connection now is attempted, also through R. The third connection does not use congestion control either. Describe a scenario in which, for at least a while, the third connection gets none of the available bandwidth. and the first two connections proceed with 50% each. Does it matter if the third connection uses slow start? How does full congestion avoidance on the part of the first two connections help solve this? 10:33 am Type a message Dorcon 1 tahir re
A TCP connection has been running for a long time and the value of cwnd = 22759. The MSS is the traditional value of 1460 (Ethernet payload minus the TCP and IP headers). Assume that a packet gets successfully ACKed and then a timeout occurs due to packet loss. What are the values of cwnd after each sequential event? (Apply the integer floor function here and always round down for all fractional values.) cwnd after ACK: cwnd after dropped packet:
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Is this accurate or false? Assume that the most recent SampleRTT on a TCP connection is one second. The connection's current TimeoutInterval value must be greater than one second.
Suppose you want to deliver the gift to your friend, Jashim as a birthday gift. You packed the gift in five different packets, give them serial no and send them to your friend’s address at a time. Jashim has a PA to collect all packets and store them by their serial. If Jashim’s PA can receive all the packets serially then deliver them to Jashim. If any packet is missing, Then the PA inform you to resend the packet again.I. Which protocol you want to use to avoid over cost if resend is required.II. Describe your used protocol with an appropriate diagram using the above description.
TCP is a sliding window protocol. This means. а. there can be more than one segment "in flight" (sent but no ACK has been received) at a time. O b. the TCP retransmission timer slides up as ACKS are received. O c. there can only be one segment outstanding (sent but no ACK has been received) at at time.
SInternet Check sum Consider the figure below (simplex communication scenario). The TCP sender sends an initial window of 4 segments. Suppose the initial value of the sender ན༽)། sequence number, SEQ1, is 100 and the first 4 segments each contain 400 bytes of payload. As you can see ACK 3 is lost. What is the SEQ number (SEQ2, SEQ3, SEQ4, SEQ5) from the Sender and ACK Number (ACK1, ACK2, ACK3, ACK4, ACK5) from the receiver for each segment? Sender Seq1 Seq2 Seq3 Seg4 ACK1 ACK2 ACK3 ACK4 Seq5 ACK5 Receiver
Please give me correct solution.
Consider a modification to TCP's congestion control algorithm. Instead of additive increase, we can use multiplicative increase. A TCP sender increases its window size by a small positive constant a(0