Ports and protocols Flashcards
File Transfer Protocol (FTP)
port 20/21
Port 21 is a control port while port 20 is used to transfer foles
Secure Shell (SSH)
port 22
Designed to transmit data through a remote connection
SSH File Transfer Protocol
Port 22
A completely separate protocol from FTP (it is not compliant with FTP servers) that uses SSH to encrypt file transfers.
TACACS+
Port 49
Cisco proprietary protocol used for authentication, authorization, and account (AAA) services.
Domain Name System (DNS)
port 53
Used to associate IP addresses with domain names.
Dynamic Host Configuration Protocol (DHCP)
port 67/68
This network management protocol is used to assign local IP addresses to devices on a network. It is used to create multiple private IP addresses from one public IPv4 address.
Hypertext Transfer Protocol (HTTP)
port 80
Protocol used for websites and most internet traffic.
Kerberos
port 88
Network authentication protocol that allows for communication over a non-secure network.
Post Office Protocol (POP)
port 110
Email protocol that allows email clients to communicate with email servers. POP provides only one-way communication.
Internet Message Access Protocol (IMAP)
ports 143, 993
Email protocol used by email clients to communicate with email servers. Provides two-way communication unlike POP.
Simple Network Management Protocol (SNMP)
ports 161/162
Protocol used to monitor and manage network devices on IP networks.
Lightweight Directory Access Protocol (LDAP)
port 389
Used to manage and communicate with directories.
Hypertext Transfer Protocol Secure (HTTPS)
port 443
Secure version of HTTP that used TLS for encryption. Most websites use HTTPS instead of HTTP.
Lightweight Directory Access Protocol Secure (LDAPS)
port 636
Secure version of LDAP that uses TLS for encryption.
File Transfer Protocol Secure (FTPS)
port 989/990
FTPS uses TLS for encryption. It can run on ports 20/21 but is sometimes allocated to ports 989/990.
