From 102923b6c46e9268d69e8013d6c85fe4028dbeb4 Mon Sep 17 00:00:00 2001
From: Sana147 <14mseeshabib@seecs.edu.pk>
Date: Sun, 7 May 2023 21:41:00 +0000
Subject: [PATCH] Update 'Test_Cases/Test_Case3/readme'

---
 Test_Cases/Test_Case3/readme | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Test_Cases/Test_Case3/readme b/Test_Cases/Test_Case3/readme
index 0765d80..abe2217 100644
--- a/Test_Cases/Test_Case3/readme
+++ b/Test_Cases/Test_Case3/readme
@@ -22,5 +22,7 @@ This folder contains details for Test_Case3.
 18. RSV = The reserved bits are set to zero for now.
 19. Flgas: set according to the packet type.
 20. Window Size = 0
-21. Checksum = 
+21. TCP Checksum = initially zero, then:
+(i) Concatenate TCP Pseudo header (Protocol, Source IP, Destination IP, Total Length) with TCP header and TCP data. This creates a big integer.
+(ii) Convert this integer to binary and compute bit wise 1's complement. 
 22. Urgent Pointer = 0 for now.