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Alla [95]
3 years ago
5

Which field in a Transmission Control Protocol (TCP) header provides the next expected segment?

Computers and Technology
1 answer:
Papessa [141]3 years ago
3 0

In a Transmission Control Protocol (TCP) header next  Expected segment is provided by Acknowledgment Number

Explanation:

  • TCP is one of the main protocols of the Internet protocol suite. It originated in the initial network implementation in the Internet Protocol.
  • The fields in TCP Segment Header are Source Port, Destination Port, Sequence Number, Acknowledgement Number, Header Length, Flags, Window Size, TCP Checksum and Urgent Pointer.
  • The Acknowledgment Number is a  32 Bit number field which indicates the next sequence number that the sending device is expecting from the other device.
  • The SYN packets consume one sequence number, so actual data will begin at ISN+1. The sequence number is the byte number of the first byte of data in the TCP packet sent.
  • If the acknowledgment flag is set in the flags field, the acknowledgment number field holds the sequence number of the next byte that the receiver expects.
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Answer:

<em>The program written in Python 3 is as follows;</em>

<em>The program does not make use of comments; however, see explanation section for detailed line by line explanation of the program</em>

num = int(input("Number of Inputs: "))

mylist = []

userinput = int(input("Enter a digit: "))

i = 1

while i < num:

     mylist.append(userinput)

     userinput = int(input("Enter a digit: "))

     i += 1

   

try:

     first7 = mylist.index(7)+1

     print('The first position of 7 is ',first7)

     last7 = num - 1 - mylist[::-1].index(7)

     print('The last position of 7 is ',last7)

except:

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Explanation:

This line prompts user for the number of inputs

num = int(input("Number of Inputs: "))

This line declares an empty list

mylist = []

This line inputs the first number into the empty list

userinput = int(input("Enter a digit: "))

The italicized lines represent an iteration that allows user to input the numbers into the empty list.

<em>i = 1</em>

<em>while i < num:</em>

<em>      mylist.append(userinput)</em>

<em>      userinput = int(input("Enter a digit: "))</em>

<em>      i += 1</em>

The try-except is used to check the presence of 7 in the list

try:

This checks the first occurrence of 7

     first7 = mylist.index(7)+1

This prints the first occurrence of 7

     print('The first position of 7 is ',first7)

This checks the last occurrence of 7

     last7 = num - 1 - mylist[::-1].index(7)

This prints the last occurrence of 7

     print('The last position of 7 is ',last7)

The following is executed if there's no occurrence of 7

except:

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See Attachments for sample runs

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