Network Protocols Flashcards
FTP
Port 21, TCP
used to transfer files from host to host. Not secure. See also TFTP and SFTP
SSH
Port 22, TCP/UDP
Secure Shell
used to remotely administer network devices and systems. See also SCP (secure copy) and SFTP (secure FTP)
SCP
Port 22, TCP/UDP
Secure Copy
See also SSH and SFTP
SFTP
Port 22, TCP/UDP
Secure File Transfer Protocol
See also SSH, SCP, and FTP
Telnet
Port 23, TCP/UDP
Telnet is unencrypted. Used to be used for remote administration. Should be DISABLED EVERYWHERE as it is not secure.
SMTP
Port 25 TCP
Simple Mail Transfer Protocol
common email service. See also IMAP and POP3
DNS
Port 53, TCP/UDP
Domain Name Service
used to resolve hostnames to IPs, IPs to hostnames
TFTP
Port 69, UDP
Trivial FTP.
Simplified FTP. Not secure.
HTTP
Port 80, TCP
Hyper Text Transfer Protocol
web browser, not secure
Kerberos
Port 88, TCP/UDP
Kerberos
Used for network authentication using a system of tickets within a Windows domain
POP3
Port 110, TCP
Post Office Protocol v3
common email. Not secure on port 110. Port 995 has secure POP3 using SSL/TLS encrypted connection
NNTP
Port 119, TCP
Network News Transfer Protocol
used for Usenet articles
RPC
Port 135 TCP/UDP
Remote Procedure Call
used to locate DCOM ports and request a service from a program on another computer on the network
NetBIOS
Ports 137-139, TCP/UDP
NetBIOS is used to conduct name querying, sending of data, and other functions
IMAP
Port 143, TCP
Internet Message Access Protocol
common email client with more features than POP3
SNMP
Port 161, UDP
Simple Network Management Protocol
remotely admin network devices
First version to support encryption is SNMPv3
SNMPTRAP
Port 162, TCP/UDP
Used to send Trap and InformRequests to the SNMP manager on a network. SNMP part is Simple Network Management Protocol
LDAP
Port 389 TCP/UDP
Lightweight Directory Access Protocol
used to maintain directories of users and others. Often connected to a RADIUS. MS Active Directory is a type of LDAP
HTTPS
Port 443 TCP
Hyper Text Transfer Protocol Secure
for secure web browsing. Uses SSL/TLS encrypted connection
SMB
Port 445 TCP
Server Message Block
provides shared access to files and other resources on a network
SMTP with SSL/TLS
Ports 465, 587 TCP
Simple Mail Transfer Protcol (secure)
email. Uses SSL or TLS secured connection
Syslog
Port 514 UDP
Syslog
used for system logging, particular routers and firewalls
This is the plaintext version. The encrypted version is on port 6514 using TCP, and is called syslog-ng or rsyslog or syslog TLS.
LDAP SSL/TLS
Port 636 TCP/UDP
Lightweight Directory Access Protocol
used to maintain directories of users and other objects, over encrypted SSL/TLS connection
iSCSI
Port 860 TCP
Internet Small Computer Systems Interface
used for linking data storage facilities over IP
