Internet Check sum Consider the figure below (simplex communication scenario). The TCP sendel sends an initial window of 4 segments. Suppose the initial value of the sender )) 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 X ACK3 ACK4 Seq5 ACK5 Receiver

Internet Check sum Consider the figure below (simplex communication scenario). The TCP sendel sends an initial window of 4 segments. Suppose the initial value of the sender )) 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 X ACK3 ACK4 Seq5 ACK5 Receiver

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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Concept explainers

Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.

Question

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

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Step 1: Defining the role of sequence number and acknowledgment number in TCP

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Step 2: Determining SEQ2, SEQ3, SEQ4, SEQ5, ACK1, ACK2, ACK3, ACK4 and ACK5 :

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Suppose we have switches S1 through S4; the forwarding-table destinations are the switches themselves. The tables for S2 and S3 are as below, where the next_hop value is specified in neighbor form: S2: ⟨S1,S1⟩ ⟨S3,S3⟩ ⟨S4,S3⟩ S3: ⟨S1,S2⟩ ⟨S2,S2⟩ ⟨S4,S4⟩ From the above we can conclude that S2 must be directly connected to both S1 and S3 as its table lists them as next_hops; similarly, S3 must be directly connected to S2 and S4. (a). The given tables are consistent with the network diagrammed in exercise 6.0. Are the tables also consistent with a network in which S1 and S4 are not directly connected? If so, give such a network; if not, explain why S1 and S4 must be connected. (b). Now suppose S3’s table is changed to the following. Find a network layout consistent with these tables in which S1 and S4 are not directly connected. Do not add additional switches. S3: ⟨S1,S4⟩ ⟨S2,S2⟩ ⟨S4,S4⟩ While the table for S4 is not given, you may assume that forwarding does work correctly.…
Please give me correct solution.
b) Consider the following TCP data transfer diagram: Host B Host A Timeout interval Timeout interval Seq-249, 40 bytes Seq 289, 60 bytes X* Seq=249, 40 bytes Ack 289 Ack-349 Ack=349 i) What is the new value of SendBase at Host A after receiving the Ack # 349? ii) What will be the change in the given sequence if the second Ack (#349) comes before the first timeout interval? Draw the diagram with changes. iii) If instead of first Ack (#289), first data segment (seq # 249, 40 bytes) is lost, what will be the Ack sent by Host B for the second segment (Seq # 289, 60 bytes) sent by Host A?
UDP and TCP use 1s complement for their checksums. Suppose the receive received two 3-bits payload messages: 010, 001. The checksum received is 100. Find all possible original messages. How many errors were made during the transmission?
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13. The following figures plot the timeline for sending TCP segments by host A and TCP ACKS by host B, where “seq #” is the value of the sequence number in the TCP header, and "ACK #” is the value of the acknowledge number in the TCP header. Assume that every segment always includes 500 bytes of data, excluding the TCP header. A seg #: 1000 seq #: 1500 seq #: 2000 seq #: 2500 (1) B ACK #: a ACK #: b ACK #: c ACK #: d A seq #: 1000 seq #: 1500 seq #: 2000 seq #: 2500 (2) B ACK #: r ACK #: s TACK 1) In Figure (1), the second ACK sent out by host B gets lost in the network. a) What are the acknowledge numbers a, b, c, and d? b) Will sender A think the segment with seq#=1500 was lost because it never receives the acknowledgement from B containing ACK# = b? 2) In Figure (2), the second TCP segment from host A to host B gets delayed in the network but later arrives at B. What should be the value for the ACK number r, s and t?
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