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Chapter 9 - TCP/IP Applications (Transport Layer and Network Layer…
Chapter 9 - TCP/IP Applications
Transport Layer and Network Layer Protocols
UDP
Connectionless
Apps that are UDP
NTP / SNTP - Port 123
TFTP - Port 69
DHCP - ports 67 and 68
ICMP
Handles disconnect or host unreachable messages
ping
TCP
Connection-Oriented Communication
Three Way Handshake
Client <-- Syn, Ack <-- Server
Client --> Ack --> Server
Client --> Syn --> Server
Checks for Errors
IGMP
groups of computers / routers in multicast
224.0.0.0/4
The Power of Port Numbers
IANA Port Numbers
Well Known Ports - 0 - 1023
Registered Ports - 1024 - 49151
Dynamic or Private Ports - 49152 - 65535
Common TCP/IP Applications
World Wide Web - 80 and 443
Telnet 23 and SSH 22
Email
POP3 - Port 110
IMAP - port 143
SMTP - Port 25
FTP - 20 and 21
Active
Passive