Skill · Networking · Understand and observe an IP network
Tell TCP from UDP and interpret refusals, timeouts and resets
Choose between TCP and UDP, test a port with netcat, and interpret what a refusal, a timeout or a reset is telling you.
Start lesson 1The Networking domain
- 1 lesson
- ~25 min of reading
- 1 quiz
- 0 proof lab
The path
Where it comes from, where it leads
What you need to know first, where you stand on this skill, and what it opens next. Your status is computed in your browser, from what you have read and passed.
Before · 1 prerequisite
This skill, for you
Tell TCP from UDP and interpret refusals, timeouts and resets
Computing
It unlocks · 7 skills
- Capture and read network traffic
- Troubleshoot an unreachable service end to end
- Inventory the exposed services of a host or a network
- Filter traffic with a stateful firewall
- Read an HTTP(S) exchange and troubleshoot an application error
- Translate addresses: SNAT, DNAT and port forwarding
- Troubleshoot a TLS error and produce a certificate
The path through the foundations From the most upstream foundation to this skill: what is in place, what remains to read.
Lessons
How to learn it
1 lesson, about ~25 min, in program order. Each lesson ends with its quiz.
The program
1 lesson · ~25 min
Beyond the lessons
Assess, practise, pass the proof
Reading a lesson confirms nothing. A skill is confirmed by a passed quiz, practised in a guided lab, and put to the test by a challenge or a mission; an imported lab result is not verified by the site.
Assess yourself
1 quiz
At the end of the lessons: passed at 70%, it confirms the skill.
Practice
No guided lab
No guided lab practices it yet.
Proof
No proof
Neither a challenge nor a mission with a proof yet.
Placement test
Preparing the questions…
Your answers in detail
For each question asked: your answer, the correct answer, its explanation and the page to reread.
Around it
Who requires it, who teaches it
Required by
No published job requires it yet.
Taught by
Same block · Understand and observe an IP network