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TCP vs UDP

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TCP- Transmission control protocol
Provide guaranteed delivery data packets
Error Detection
Windowing
Connection Oriented


Common TCP Ports
FTP 20,21
SSH (Secure shell) 22
Telnet 23
SMTP 25
HTTP 80
POP3 110
SSL 443


UDP- User datagram protocol
Best Effort, not guaranteed of data packets
No Error Correction
No Windowing
Connectionless


Common UDP Ports
DHCP 67, 68
TFTP (Trivial File Transfer protocol) 69
SNMP 161


USED BY BOTH PROTOCOLS
DNS 53
Port 24 is reserved for both TCP or UDP for private mail system.SNMP 161