In this second programming assignment, you will be writing the sending and receiving transport-level code for implementing a simple reliable data transfer protocol. The basic assignment will be to implement the Alternating Bit Protocol (rdt3.0); the extra credit assignment will be to implement a Go-Back-N protocol. Learn how to implement protocol (in this case Alternating Bit Protocol) using Socket. Learn how to write a socket program that implements a protocol entity, in our case the sender. Learn how to use select and set up timeout for retransmission when packets are lost.

Simulation Of TCP RDT 3.0 Stop Protocol (Failed! ! ! ) – DDCODE
Alternating Bit Protocol C Programming
Alternating Bit Protocol C Code

May 09, 2019 The assignment requirement is to realize a reliable transmission simulation program according to rdt 3.0 protocol. The program was given by the teacher. Of course, the program is incomplete and needs to be modified and perfected by itself. Altbit.c is the code file that needs to be changed, and all other files are correct. The Alternating Bit Protocol Bartlett, 69 is an example used widely to illustrate the application of formal methods to protocols. It is assumed that the reader has some familiarity with this protocol so we will go directly to our particular model of it. The version being used is that described in Bochmann, 77.

Simulation Of TCP RDT 3.0 Stop Protocol (Failed! ! ! ) – DDCODE

Reliable Data Transfer Protocol implementation in C++ using modified ALTERNATING BIT AND GO-BACK-N NETWORK EMULATORFROM VERSION 1.1 of J.F.Kurose as an assignment of Computer Networking Lab in Level-3, Term-2 of BUET.

Alternating Bit Protocol C Programming

In this assignment sender and receiver implemented for two versions of RDT3.0 are implemented for only simplex data transfer:

Alternating-bit protocol (ABP)
Go-Back-N (GBN) with finite sequence numbers [0,7].

Additional Implementation:

separate timers used for each packet in sender's window.
another modified version of go-back-n is implemented which sends cumulative ack after certain timeout unlike normal gbn.

Detailed specifications can be found at 'offline_specification.pdf' in folder 'Assignment-Specifications'.

Simulation:

compile and run rdt_abp.cpp to simulate Alternating-bit protocol.
compile and run rdt_gbn.cpp to simulate Go-Back-N protocol.
compile and run rdt_gbn_cumulative_ack.cpp to simulate Go-Back-N protocol with modified receiver.

This repo has been worked in CLion project and that's why CMakeLists.txt exists here.

Programming Assignment 2: Implementing a reliable transport protocol

Web posted: March 27, 22:30 hrs
Due: April 13, 17:00hrs

VIP/NTU students: Due 16 days from when you receive this assignment or view lecture 16, whichever is later.

Overview

In this laboratory programming assignment, you will be writing the sendingand receiving transport-level code for implementing a simple reliable datatransfer protocol. There are two versions of this lab, the Alternating-Bit-Protocolversion and the Go-Back-N version. This lab should be FUN

Alternating Bit Protocol C Code

since your implementation will differ very little from what would be requiredin a real-world situation.

Important Note: You are expected to do and hand in only theGo-Back-N assignment. However, as noted below, it may be useful if you did the basicassignment first (we don't require you to do so, nor are there any points for the basicassigmnent).

Since you probably don't have standalone machines (with an OS that youcan modify), your code will have to execute in a simulated hardware/softwareenvironment. However, the programming interface provided to your routines,i.e., the code that would call your entities from above and from below is very close to what is done in an actual UNIX environment. (Indeed, thesoftware interfaces described in this programming assignment are much morerealistic that the infinite loop senders and receivers that many textsdescribe). Stopping/starting of timers are also simulated, and timer interruptswill cause your timer handling routine to be activated.

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The routines you will write

The procedures you will write are for the sending entity (A) and the receivingentity (B). Only unidirectional transfer of data (from A to B) is required.Of course, the B side will have to send packets to A to acknowledge (positivelyor negatively) receipt of data. Your routines are to be implemented inthe form of the procedures described below. These procedures will be calledby (and will call) procedures that I have written which emulate a networkenvironment. The overall structure of the environment is shown in FigureLab.2:

Figure Lab. 2: structure of the emulated environment

The unit of data passed between the upper layers and your protocolsis a message, which is declared as:This declaration, and all other data structure and emulator routines, aswell as stub routines (i.e., those you are to complete) are in the file,prog2.c,described later. Your sending entity will thus receive data in 20-bytechunks from layer5; your receiving entity should deliver 20-byte chunksof correctly received data to layer5 at the receiving side.

The unit of data passed between your routines and the network layeris the packet, which is declared as:Your routines will fill in the payload field from the message data passeddown from layer5. The other packet fields will be used by your protocolsto insure reliable delivery, as we've seen in class.

The routines you will write are detailed below. As noted above, suchprocedures in real-life would be part of the operating system, and wouldbe called by other procedures in the operating system.

A_output(message), where message is a structure of typemsg,containing data to be sent to the B-side. This routine will be called wheneverthe upper layer at the sending side (A) has a message to send. It is thejob of your protocol to insure that the data in such a message is deliveredin-order, and correctly, to the receiving side upper layer.

A_input(packet), where packet is a structure of type pkt.Thisroutine will be called whenever a packet sent from the B-side (i.e., asa result of a tolayer3() being done by a B-side procedure) arrivesat the A-side. packet is the (possibly corrupted) packet sentfrom the B-side.

A_timerinterrupt() This routine will be called when A's timerexpires (thus generating a timer interrupt). You'll probably want to usethis routine to control the retransmission of packets. See starttimer()and stoptimer() below for how the timer is started and stopped.

A_init() This routine will be called once, before any of your otherA-side routines are called. It can be used to do any required initialization.

B_input(packet),where packet is a structure of type pkt.Thisroutine will be called whenever a packet sent from the A-side (i.e., asa result of a tolayer3() being done by a A-side procedure) arrivesat the B-side. packet is the (possibly corrupted) packet sentfrom the A-side.

B_init() This routine will be called once, before any of your otherB-side routines are called. It can be used to do any required initialization.

Software Interfaces

The procedures described above are the ones that you will write.I have written the following routines whic