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GSNA · Question #221

A sequence number is a 32-bit number ranging from 1 to 4,294,967,295. When data is sent over the network, it is broken into fragments (packets) at the source and reassembled at the destination…

The correct answer is B. 24619311. You took 3 seconds to establish a connection. During this time, the value of the Initial Sequence Number would become [24171311 + (1 64000) + (3 128000)], i.e., 24619311.

Network & Perimeter Auditing

Question

A sequence number is a 32-bit number ranging from 1 to 4,294,967,295. When data is sent over the network, it is broken into fragments (packets) at the source and reassembled at the destination system. Each packet contains a sequence number that is used by the destination system to reassemble the data packets in the correct order. The Initial Sequence Number of your computer is 24171311 at login time. You connect your computer to a computer having the IP address 210.213.23.21. This whole process takes three seconds. What will the value of the Initial Sequence Number be at this moment?

Options

  • A24171811
  • B24619311
  • C24171111
  • D24171311

How the community answered

(38 responses)
  • A
    13% (5)
  • B
    76% (29)
  • C
    3% (1)
  • D
    8% (3)

Explanation

You took 3 seconds to establish a connection. During this time, the value of the Initial Sequence Number would become [24171311 + (1 * 64000) + (3 * 128000)], i.e., 24619311.

Topics

#TCP sequence numbers#ISN calculation#packet sequencing#network protocol

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