Well known ports 0-1023
Registered ports 1024 - 49151
Private or Dynamic ports 49,152 - 65,535
20 - [TCP] FTP File Transfer Protocol FTP (Data)
21 [TCP] File transfer prtocol FTP (control)
22 [TCP] Secure Shell SSH
23 [Telnet] Telecommunication Network
25 [TCP] Simple Mail Transfer Prtocol (SMTP)
53 [UDP/TCP] Domain Name Service (DNS)
67 [UDP] Dynamic Host Configuration Protocol (DHCP) - Server
68 [UDP] Dynamic Host Configuration Protocol (DHCP) - Client
69 [UDP] Trvial File Transfer Protocol (TFTP)
80 [TCP] Hypertext Transfer Protocol (HTTP)
110 [TCP] Post Office Protocol version 3 (POP3)
135 [UDP/TCP] Microsoft EPMAP Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service, used to remotely manage services including DHCP server, DNS server, and WINS. Also used by DCOM
137 NetBIOS-ns TCP UDP NetBios Name Servicc used for name registration and resolution
UDP = User Datagram Protocol TCP = Transmission Control Protocol \
143 [TCP] Internet Message Access Protocol (IMAP)
161 [UDP] Simple Network Management Protocol (SNMP)
443 [TCP] Hypertext Transfer Protocol Secure (HTTPS)
S1# delete vlan.dat (hit ‘enter’ to accept defaults) [Note: Only do this on a switch]
Some applications may use both TCP and UDP. For example, DNS uses UDP when clients send requests to a DNS server. However, communication between two DNS servers always uses TCP.
netstat protocol
