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SMTP
Port 25 used to send email.
POP3
Port 110 downloads email to one device.
IMAP
Port 143 synchronizes email across multiple devices.
LDAP
Port 389 used by Active Directory directory services.
DNS
Port 53 translates host names into IP addresses.
DHCP
Ports 67 and 68 automatically assign IP addresses.
Telnet
Port 23 used for unsecured remote terminal access.
HTTP
Port 80 used for web traffic.
HTTPS
Port 443 used for secure web traffic.
FTP
Ports 20 and 21 used for file transfers.
RDP
Port 3389 used for Remote Desktop.
SMB
Port 445 used for Windows file sharing.
DNS Lookup Command
nslookup
Trace Route Command
tracert
Test Connectivity Command
ping
View IP Configuration
ipconfig
View ARP Cache
arp