Ports and Protocols (REALLY IMPORTANT) Flashcards
Port
Logical communication endpoint that exists on a computer or server
Inbound Port
Logical communication opening that exists on a computer or server that is listening for a connection from a client
Outbound Port
Logical communication opening created on a client in order to call out to a server that is listening for a connection
Ports
Can be any number between 0 and 65,535
Well-Known Ports
Ports 0 to 1023 are considered well-known and are assigned by the Internet Assigned Number Authority (IANA)
Registered Ports
Ports 1024 to 49151 are considered registered and are usually assigned to proprietary protocols
Dynamic and Private Ports
Ports 49152 to 65535 can be used by any application without being registered with IANA. Commonly used for gaming and chats
File Transfer Protocol (FTP)
Ports 20, 21
Provides insecure file transfers
Secure Shell (SSH)
Port 22
Provides secure remote control of another machine using text-based environment
Secure File Transfer Protocol (SFTP)
Port 22
Provides secure file transfers
Telnet
Port 23
Provides insecure remote control of another machine using a text-based environment
Simple Mail Transfer Protocol (SMTP)
Port 25
Provides ability to send emails over the network
Domain Name Service {DNS}
Port 53
Converts domain names to IP addresses, and IP addresses to domain names
Dynamic Host Configuration Protocol (DHCP)
Ports 67. 68
Automatically provides network parameters, such as assigned IP address, subnet mask, default gateway, and the DNS server
Hypertext Transfer Protocol (HTTP)
Port 80
Used for insecure web browsing
Post Office Protocol Version Three (POP3)
Port 110
Used for receiving incoming emails
Network Basic Input/Output System (NetBIOS)
Ports 137, 139
Used for file or printer sharing in a Windows network
Internet Mail Application Protocol (IMAP)
Port 143
A newer method of retrieving incoming emails which improves upont the older POP3
Simple Network Management Protocol (SNMP)
Ports 161, 162
Used to collect data about networks devices and monitor their status
Lightweight Directory Access Protocol (LDAP)
Port 389
Used to provide directory services to your network
Hypertext Transfer Protocol - Secure (HTTPS)
Port 443
Used as a secure and encrypted version of web browsing
Uses either (Secure Socket Layer) SSL or (Transport Layer Security) TLS
Server Message Block (SMB)
Port 445
Used for Windows file and printer sharing services
Remote Desktop Protocol
Port 3389
Provides graphical remote control of another client or server
