Update 'Test_Cases/Test_Case3/readme'

Test_Cases/Test_Case3/readme

@@ -26,3 +26,28 @@ This folder contains details for Test_Case3.
 (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.
+
+The value of header comes out to be:
+header = {}
+header[0] = 0x45, Version, IHL
+header[1] = 0x00, TOS, 
+header[2] = 0x00, Total Length,
+header[3] = 0x28, Total Length, 
+header[4] = 0x00, Identification,
+header[5] = 0x03, Identification,
+header[6] = 0x00, Flags + Fragment Offset,
+header[7] = 0x00, Flags + Fragment Offset,
+header[8] = 0x28, TTL
+header[9] = 0x06, Protocol
+header[10] = 0x00, Header Checksum
+header[11] = 0x00, Header Checksum
+header[12] = 0xac, Source IP,
+header[13] = 0xa8, Source IP,
+header[14] = 0x05, Source IP,
+header[15] = 0x03, Source IP,
+header[16] = 0xac, Destination IP,
+header[17] = 0xa8, Destination IP,
+header[18] = 0x05, Destination IP,
+header[19] = 0x04, Destination IP,
+
+The value of IP_Header_Checksum comes out to be: .