4.10 Networking
Every entry filed under Networking and its subtopics.
Level
- Beginner 12
- Intermediate 4
- Advanced 0
What kind of help
What do these mean?
- Beginner
- You are new to this topic.
- Intermediate
- You use it, and want to get better.
- Advanced
- You know it well and need the details.
- Guided project
- Build something small from start to finish, step by step.
- Explains an idea
- Plain words on how something works and why.
- Step by step
- Numbered steps to get one task done.
- Cheat sheet
- Commands and options in a table, to look up fast.
- Fixes an error
- An error message, what it means, and how to solve it.
9 entries match these filters
- 0449 Nmap: the network mapper for inventorying your own network Nmap is the long-standing open source tool for discovering hosts, open ports, services and operating systems on a network you administer, used… Linux, macOS, Windows Repo DNS, IP addresses & ports · Security testing & CTF 15 Oct 2026
- 0435 CrowdSec: collaborative intrusion prevention that shares blocklists CrowdSec reads your logs, detects attacks such as brute force and scanning, blocks the source, and shares anonymised reports so that every… Linux, Windows Repo Detection & threat hunting · Firewalls 15 Oct 2026
- 0345 SSH keys: create, copy and use them Generate an ed25519 key pair, install the public key on a server with ssh-copy-id, keep the private key protected with a passphrase… Beginner · Step by step · Linux, macOS, Windows Article Keys & config · SSH 15 Oct 2026
- 0346 The SSH config file: aliases, jump hosts and keys per server Reference for ~/.ssh/config: short names for servers, the right user, port and key per host, ProxyJump through a bastion, connection reuse and… Intermediate · Cheat sheet · Linux, macOS, Windows Article Keys & config · SSH 15 Oct 2026
- 0266 What is a port? A port is a numbered door on a computer that lets one machine run many network services at the same time. Beginner · Explains an idea · Any system Article DNS, IP addresses & ports 15 Oct 2026
- 0274 What is DNS? DNS is the internet's phone book: it turns names like example.com into the IP addresses computers actually use. Beginner · Explains an idea · Any system Article DNS, IP addresses & ports 15 Oct 2026
- 0275 What is an IP address? An IP address is the unique number that identifies a device on a network so data knows where to go. Beginner · Explains an idea · Any system Article DNS, IP addresses & ports 15 Oct 2026
- 0280 What is a firewall? A firewall is a filter that decides which network connections are allowed in or out of a computer or network. Beginner · Explains an idea · Any system Article Firewalls 15 Oct 2026
- 0276 What is SSH? SSH is a secure way to open a command line on another computer over the network, with everything encrypted. Beginner · Explains an idea · Any system Article SSH 15 Oct 2026