CS455 - Computer Communications and Networking - IT Assignment Help

Assignment Task

MTP specifications

Types of packets and packet size

MTP specifies only two types of packets: DATA and ACK. In our simple settings of sending a file from sender to the receiver, the sender opens a UDP client socket and the receiver opens a UDP server socket. The sender then sends DATA packets, and when the receiver receives them, ACK packets are sent back.

Since MTP is a reliable delivery protocol, the DATA packets and ACKs should contain a sequence number. The data packet has a header with the following fields

1. type (unsigned integer): data or ack

2. seqNum (unsigned integer): sequence number

3. length (unsigned integer): length of data

4. checksum (unsigned integer): 4 bytes CRC

MTP DATA packet looks as shown below. Note that your MTP header + data is encapsulated in UDP header since the sender and receiver connect over a UDP socket. Of course, the UDP header is already added by the socket, and something that you don’t have to implement MTP ACK packet will have the same fields in its header, without any data. We will assume MTU size of 1500 bytes. With 8 bytes of UDP header and 20 bytes of IP header, sizeof(MTP header + data) can be no more than 1472 bytes.

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