December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Chapter 3: The Internet and TCP/IP 111
• Upon receipt of this first segment, the server records the sequence number and
then responds to the client by generating and transmitting an acknowledgment
segment, which has the SYN and acknowledgment (ACK) bits of the control field
set to 1. Additionally, this segment’s four-byte ACK number field is set to one
more than the client’s initial sequence number (x + 1), and the four-byte sequence
number field is set to the server’s initial sequence number (y). Note that the one-
bit SYN flag = 1 because the synchronization process (i.e., the handshaking) is
still ongoing and that the one-bit ACK flag = 1 because ...
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