5. 46 to 1500 bytes

9. 16 8 31
TYPE
CODE
CHECKSUM
IDENTIFIER
SEQUENCE NUMBER
OPTIONAL DATA
ICMP Echo message

10. 16 8 31
UDP SOURCE PORT
UDP DESTINATION PORT
LENGTH
CHECKSUM
DATA
UDP DATAGARAM

14. Destination
Reassembly Required
router
IP packet fragments
Fragments Created
router
IP packet
source

15. ftp client ftp server 2353 2349 21 20 TCP Segments
2353
2349 21 20
TCP Segments
Proto Local Address Foreign Address
TCP : :21
TCP : :20

17. Send Segments
Receive Segments with ACK
Sliding Window Protocol
time