Protocols and Port Numbers Flashcards
NetBios
A standard communication protocol that does two things: File/folder/printer sharing, and also handles naming of users, computers, and groups.
Uses TCP and UDP ports 137, 138, and 139
SMB over TCP-IP
445
This is the newer replacement for NetBIOS.
It either uses the NetBIOS port numbers (TCP and UDP ports 137, 138, and 139), or could be configured to use port 445 instead.
Sometimes known as CIFS (Common Internet File System)
FTP
20, 21
TFTP
UDP 69 - insecure! (no authentication)
SSH
22
Telnet
TCP 23
DNS - Zone Transfers
TCP 53 for zone transfers
HTTP
80, 81, 8080
HTTPS
443
Kerberos
88
Uses DES or AES for encryption
SMTP
25
POP3
110
NTP
UDP 123 - Network Time Protocol: synchonizes the time on your devices
SNMP
UDP 161
SNMPv3 is secure (authentication & encryption). You can further secure it with IP filtering: only allow the Admin’s IP to talk to the SNMP port on the target device. Often used in a SIEM (Security Information and Event Monitoring) system.
Syslog
UDP 514
RDP
3389
LDAP
389
Secure LDAP
636 (LDAP over SSL)
SQL Server
1433 & 1434
DNS - Individual Queries
UDP 53 for individual queries
NetBios - File and Print Sharing
TCP 139
Standard communication protocol. Can use port 139 for file and printer sharing.
Windows Printing Service
TCP 515
Mac OS X Printer Sharing Printing Service
TCP 631
HP JetDirect
9100