FTP, Port 20/21 · TCP · Unencrypted file transfer, Telnet, Port 23 · TCP · Unencrypted remote command line, SMTP, Port 25 · TCP · Unencrypted email between servers, DNS, Port 53 · TCP/UDP · Translates domain names to IPs, DHCP, Port 67/68 · UDP · Auto-assigns IP addresses, TFTP, Port 69 · UDP · Bare-bones file transfer, no authentication, HTTP, Port 80 · TCP · Unencrypted web browsing, NTP, Port 123 · UDP · Syncs clocks across the network, SNMP, Port 161/162 · UDP · Monitors network devices, passwords in plaintext, LDAP, Port 389 · TCP · Unencrypted directory lookup, SMB, Port 445 · TCP · Windows file and printer sharing, Syslog, Port 514 · UDP · Sends device logs to central server, SQL Server, Port 1433 · TCP · Microsoft SQL database communication, RDP, Port 3389 · TCP · Remote Windows desktop access, SIP, Port 5060 · TCP/UDP · Unencrypted VoIP call setup
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