why are port numbers included in the tcp header of a segment?this question is part of CCNA protocol practice quiz

Why are port numbers included in the TCP header of a segment?

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Asked by ED, Last updated: Dec 17, 2024

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Olive landon, Health science specialist, Master of Health Science (MHS), Logdon, Utah

Answered Sep 21, 2020

The reason why port numbers are included in the TCP header of a segment is so that the TCP header can easily determine which layer 3 protocol should be used to encapsulate the data. TCP is the short form of the Transmission Control Protocol. It is used majorly to provide a very reliable and safe transport service.

This service relies greatly on the network layer service given by the IP protocol. Usually, after TCP has grouped bytes into different segments, one header needs to be attached to each segment. This will help each segment being sent to be rightly encapsulated into an appropriate IP packet.

The port numbers in the TCP header are not primarily needed to indicate the correct router interface that should be used to forward a segment or to enable a receiving host to forward the data to the appropriate application. However, it is important to note that the TCP header of different bytes, but usually between 20-60 bytes.

C. Perez, Writer, Writer, Cleveland

Answered Aug 01, 2019

The correct answer to this question isTo determine which Layer 3 protocol should be used to encapsulate the data. TCP stands for Transmission Control Protocol. It is an Internet protocol suite and one of the main ones. It packages data messages and then sends them over the Internet. TCP is reliable and error-free.

TCP headers require ten fields. These ten fields are 20 bytes in size. TCP headers will support up to 40 bytes in size. There is a sequence the headers must follow, which starts with the source TCP port number and ends with the TCP arbitrary data.

N. Kingsley, Writer, Columbus

Answered Sep 26, 2018

The TCP header of a segment includes a combination of special numbers. These numbers are used to determine which layer 3 protocol should be used to encapsulate the data. This helps developers choose the write protocol with the data. However, it is not used to indicate the correct router in interface that should be used to forward a segment.

It is not also used to identify which ports should receive tor forward the segment. The numbers are purely for the purpose of determining the layer 3 protocol to encapsulate the data. They aid the developers in organizing the data and improve access.