FTP File Transfer Protocol; Ports 20 and 21
TFTP Trivial FTP; Port 69
SSH Secure Shell; Port 22
Telnet Unencrypted; Port 23
SMTP Simple Mail Transfer Protocol; Port 25
TACACS+ Terminal Access Controller Access-Control System Plus; Port 49
DNS Domain Name Server/Service; Port 53
HTTP HTTP or Hyper Text Transfer Protocol; Port 80
HTTPS HTTP or Hyper Text Transfer Protocol + Secure Socket Layer; Port 443
Kerberos Port 88
POP3 (v3) Post Office Protocol; Port 110
IMAP Internet Message Access Protocol; Port 143
SNMP Simple Network management Protocol; Port 161
RDP Remote Desktop Protocol; Port 3389
IPSEC Internet Protocol Security; Tunneling Protocol that encrypts IP
IPSEC (Tunnel) IPSEC in tunnel mode encrypts entire packet
IPSEC (Transport) IPSEC in transport mode only encrypts data
PPP Point to Point Protocol; Establishes layer 2 connection between two network devices
NAT Network Address Translation. Translates IP addresses accross two different networks. Typically between a private and public IP network.
PAT Port Address Translation (Aka NAT Overload); 1 to many NAT translation; Uses layer 4 ports to organize connections.
TLS Transport Layer Security; Encryption protocol that replaced SSL; Commonly used by HTTPS on port 443
FTPS File Transfer Protocol + SSL
SFTP File Transfer Protocol + SSH
IPv4 Internet Protocol version 4; 32 bits; Dotted Decimal Format
IPv6 Internet Protocol version 6; 128 bits; Hexadecimal Format