Network Protocols and Port Numbers Flashcards
20/21 TCP
Port 21 is the control port while port 20 is used to
transfer files.
File Transfer Protocol - FTP.
22 (TCP/UDP)
Designed to transmit data through a remote
connection. FTP that uses SSH to
encrypt file transfers.
Secure Shell (SSH) / SSH SFTP
49
Cisco proprietary remote authentication protocol.
It allows a remote access server to communicate with an authentication server to validate user access onto the network.
More secure than RADIUS however a little slower due to TCP
TACACS+
53 TCP/UDP
Associates IP address with domain name
Domain Name System - DNS
67/68
Assigns IP addresses to devices on a network. Creates multiple private IP addresses from one public IPV4 address
Dynamic Host Configuration
Protocol (DHCP)
80 TCP
Protocol used for websites and most internet traffic (non-secure variant)
HTTP
88 TCP/UDP
Protocol that authenticates service requests between two or more trusted hosts across an untrusted network, like the internet. It uses secret-key cryptography and a trusted third party for authenticating client-server applications and verifying users’ identities.
Kerberos
110 TCP
Protocol for communicating with an email server. Allows ONE-WAY communication
POP3 (Post Office Protocol)
143 / 993 TCP
Protocol for communicating with an email server allowing TWO-WAY communication.
Internet Message Access Protocol (IMAP)
161 / 162 UDP
Protocol used to monitor and manage network
devices on IP networks.
Simple Network Management
Protocol (SNMP)
443 TCP
Secure version of HTTP. Uses TLS encryption
HTTPS
389 TCP/UDP
Used to manage and communicate with directories.
Lightweight Directory Access
Protocol (LDAP)
636 TCP/UDP
Secure version of LDAP that uses SSL/TLS for
encryption.
LDAP Secure
989 / 990 TCP
FTPS uses TLS for encryption. It can run on ports
20/21 but is sometimes allocated to ports 989/990.
File Transfer Protocol Secure
(FTPS)
993 TCP
Secure version of IMAP with SSL/TLS encryption
Internet Message Access
Protocol Secure (IMAPS)
1812 / 1813 UDP
protocol that is commonly used to authenticate and authorize (1812) and for accounting (1813)
RADIUS
3868
TCP
Developed as an upgrade to RADIUS
Diameter
5004
secure protocol used to
stream audio and video communication using UDP. EX: ZOOM
Secure Real Time Protocol
(SRTP)
1723 TCP/UDP
Underlying VPN protocol with security
Point to Point Tunneling
Protocol (PPTP)
3389 TCP/UDP
Windows proprietary protocol that provides a remote
connection between two computers.
Remote Desktop Protocol (RDP)
1433 TCP
Port used to connect to Microsoft SQL server for SQL database queries
MS SQL
445 TCP
Protocol used for access to shared files and resources across a network
SMB Sever Message Block
5060
signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications.
SIP (Session Initiation Protocol)
23 (TCP/UDP)
a network protocol that allows a user on one computer to log into another computer that is part of the same network. Inherently not secure - data is not encrypted
Telnet
25 TCP
Communication between mail servers
SMTP Simple Mail Transfer Protocol
69 UDP
Simple version of FTP to put a file on a remote host and vice versa
TFTP Trivial File Transfer Protocol
119 TCP
Used to transfer unsent articles
NNTP Network News Transfer Protocol
135 TCP/UDP
(Remote procedure call) used to locate DCOM ports to request a service from a program on another computer on the network
RPC/DCOM-scm
137/138/139 TCP/UDP
Used to conduct name querying, sending of data and other functions over a Net BIOS connection
Net BIOS
162 TCP/UDP
Used to send TRAP and InformRequests to the SNMP manager on a network
SNMPTRAP
465/587 TCP
SMTP with SSL/TLS encryption
SMTP Secure
514 UDP
Used to conduct computer message logging, mainly for routers and firewalls
Syslog
860 TCP
Used for linking data storage facilities over IP
iSCSI (i-scussi)
995 TCP
SSL/TLS encrypted version of POP3
POP3 Secure
1645/1646 UDP
Alternative RADIUS
RADIUS (Alternative)
1701 UDP
Layer 2 tunnel protocol used as underlying VPN protocol but is not secure - needs to be paired with IPSEC for security
L2TP
3225 TCP/UDP
Used to encapsulate fiber channel frames within TCP/IP packets
FCIP - Fibre Channel IP
3260 TCP
Target listening port of iSCSI when linking data storage facilities over IP
iSCSI Target
6514 TCP
Used to conduct computer message logging, mainly for routers and firewalls over SSL/TLS encryption
Syslog over TLS
3306 TCP
Classic database port
Classic mySQL
