Source port
Window size
Source IP address
Payload length
Checksum
Telnet
SSH
ARP
FTP
NTP
TTL field
Window field
TOS field
Source IP address field
1. SYN; 2. SYN, ACK; 3. ACK
1. SYN; 2. ACK; 3. SYN
1. SYN; 2. SYN; 3. ACK
1. SYN; 2. ACK; 3. ACK
Only the sender generates a sequence number.
Both the sender and receiver generate sequence numbers.
The sequence numbers for both the sender and the receiver must match.
Only the receiver generates a sequence number.
Operates at Layer 3 of the OSI model
Uses IP protocol number 17
Connection oriented to provide reliability
UDP header contains the sequence number field
Does not guarantee data delivery
Window size
Options
Checksum
Reserved
Layer 2
Layer 4
Layer 1
Layer 5
SMTP
TFTP
FTP
SNMP
Ephemeral
Registered
Well-known
First available port on the client system
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