Ports Flashcards
Ports 20 & 21
FTP - file transfer protocol - not secure
Ports 22 - connection protocol
SSH - secure shell - remotely and securely configure routers and switches
S/FTP - Secure File Transfer - upload and download files securely
SCP - Secure Copy Protocol - very similar to S/FTP
Port 23
Telnet - remotely configure router or switch, but not secure.
Port 25
SMTP - Simple Mail transport Protocol - NOT secure - is for SENDING emails only, not receiving.
Port 49 TCP
TACACS+ - Cisco Proprietary AAA protocol. Uses TCP only.
___ is reliable
TCP is reliable
Which RADIUS server is reliable?
TACACS+
Port 53
DNS - Domain Name Service both TCP and UDP. Ties a FQDN to an IP address.
Ports 67 & 68
DHCP - Dynamic Host Configuration Protocol - UDP - How a Server assigns a private IP to hosts.
What are the steps of DHCP negotiation?
DORA: Discover Offer Request Acceptance
UDP Port 69
TFTP - Trivial File Transfer Protocol - transfer files with out reliability. Store config files for routers and switches.
Port 80
HTTP - HyperText Transfer Protocol - WWW - Internet - NOT Secure
Port 88
KERBEROS - Remote access server - if you see anything on the exam about Tickets or time sensitive, its KERBEROS. Ticket granting service, ticket granting server. Time sensitive. Mutual authentication mean KERBEROS too. both TCP and UDP. now owned by Microsoft. KERBEROS does Single Sign On.
Port 110
POP3 - Post Office Protocol - For Receiving emails - NOT secure
Port 123
NTP - Network Time Protocol - set all the clocks on devices on your network using a single server. UDP
Port 143
IMAP - Receiving emails - does not download them to your device. Leaves them on the server so they are accessible everywhere.
Ports 137/138/139
NETBIOS - Network based HOSTS file/DNS like service - ties hostname to IP address. Legacy tech
Port 161/162
SNMP - Simple Network Management Protocol - Monitors the health of your network. V3 only (V1 & 2 were not secure)
Port 389
LDAP - Unsecure version of LDAP - Lightweight Directory Access Protocol. Ties into Active Directory
Port 443
HTTPS - HyperText Transport Protocol Secure - Uses SSL or TLS or both to secure HTTP traffic.
Port 445
SMB - Server Message Block - messaging service through your computer.
Port 465
SMTPS - Simple Mail Transport Protocol Secure - Uses SSL or TLS or both.
Port 500
IPSEC -
IKE -
ISAKMP -
Port 631
- **CUPS - Common Unix Printing Service - Allows printing over the internet.
- **also called IPP - internet printing protocol.
Port 636
LDAP secure -
Port 989/990
FTPS - File Transfer Protocol Secure - SSL or TLS or both.
Port 995
POP3S
Port 1812
RADIUS - Remote Access Dial-in User Service
Port 1812
RADIUS - Remote Access Dial-in User Service, Open-Source. UDP, Unreliable. Authentication and Authorized, but NOT Accounting.
Port 1813
RADIUS Accounting
Port 3389
RDP - Remote Desktop Protocol - Microsoft only
RDP is SECURE
(Uses SSH if Linux instead of RDP)
