Port Numbers Flashcards
(21 cards)
Port 22
Secure Shell
What does FTP do?
Port 21: File Transfer Protocol (FTP) is a way to move files between computers over the internet, like a digital mailman delivering packages.
Example: A web designer uses FTP to upload new images and pages to a website, making sure visitors see the latest updates.
What is port 21?
FTP
What is port 23?
Telnet
What does Telnet do?
Port 23: Telnet is a way to remotely access and control another computer over the internet, like talking to a robot helper that follows your commands.
Example: A system administrator uses Telnet to connect to a company’s network and fix server issues without being physically present.
What is port 25?
SMTP (Simple Mail Transfer Protocol)
What does SMTP do?
Port 25: Simple Mail Transfer Protocol (SMTP) is the system that helps send emails between servers, like a postal service delivering messages to the right mailbox. Keyword: Sending
Example: When you send an email, your email provider (like Gmail or Outlook) uses SMTP to pass your message along until it reaches the recipient’s inbox.
What does SSH do?
Port 22: Secure Shell (SSH) is a way to safely access and control another computer remotely, like a secret tunnel that keeps hackers out while you send commands.
Example: A network engineer uses SSH to securely log into a server from another country to update settings without risking data theft
How does Telnet differ from SSH?
SSH is the secure and modern version of Telnet. Telnet was useful in the past, but since it doesn’t encrypt data, hackers can easily intercept commands and steal information. Most people now use SSH because it protects sensitive data while controlling remote computers.
What is port 53?
DNS ( Domain Name System)
What does DNS port do?
Port 53: Translates website names (like www.example.com) into IP addresses that computers understand, like a phonebook for the internet.
Example: When you type a website’s name into your browser, your computer uses Port 53 to contact a DNS server and find the correct IP address, allowing you to load the webpage.
What is port 110?
POP3 (Post Office Protocol version 3)
What does Pop3 do?
Port 110: Helps retrieve emails from a mail server so users can download and read them offline, like collecting letters from a mailbox. Keyword: Retrieve
Example: When you open your email app, it connects to a mail server via Port 110 to download new messages, allowing you to read them even without an internet connection.
What is port 80?
HTTP
What does the HTTP port do?
Port 80 is used for Hypertext Transfer Protocol (HTTP), which allows web browsers to communicate with websites and load pages, like a bridge connecting you to the internet.
Example: When you visit a website, your browser sends a request via Port 80 to fetch the webpage’s content, displaying text, images, and links for you to interact with.
What is port 143?
IMAP
What does the IMAP port do?
Port 143 is used for Internet Message Access Protocol (IMAP), which allows users to access and manage their emails directly on the server, like a cloud-based mailbox that syncs across multiple devices.
Example: If you check your email on your phone and then open the same inbox on your laptop, IMAP keeps everything updated so emails appear the same on all devices.
What is Port 161?
SMNP (Simple Network Management Protocol)
What is SNMP?
Port 161: (Simple Network Management Protocol) SNMP is a protocol used to monitor and manage network devices, like routers and servers, helping administrators track performance and detect issues.
Example: A company uses SNMP to monitor its network, ensuring all devices are running smoothly and alerting IT staff if a server goes offline
What is port 443?
HTTP Secure (HTTPS) HTTP
What is HTTPS?
The safer version of HTTP, using encryption to protect data between your browser and a website, like a secure tunnel that keeps hackers out.
Example: When you enter personal details on a banking website, HTTPS ensures your information stays private, preventing cybercriminals from stealing it.
