In TCP,port number fields are 16 bits long.How many possible port numbers are there?
A) 16
B) 1,024
C) 16,384
D) 64,536

Question

Quizplus · Accepted Answer

The port number field in TCP is 16 bits long which means that it has 2^16 = 65,536 possible values. However, port numbers 0-1023 are reserved for well-known services and applications, leaving the range of 1024-65535 for dynamically assigned port numbers. Therefore, the best choice is D, which correctly states that there are 64,536 possible port numbers in TCP.

In TCP,port Number Fields Are 16 Bits Long