Skill track
Networking Basics
DNS, TCP, HTTP, TLS, ports, NAT and the layer model — enough to answer "what happens when you type a URL and press enter" properly, and to debug a request that is not arriving.
Who it is for: Backend, SRE and platform candidates. This is the single most-asked systems topic in a screening round and the one most often revised the night before.
30% OFFUnlock all 10 remaining quizzes on this track at once.50 credits72save 22
Any 2 quizzes free, then 9 credits each.
Quizzes
10 quizzes, in order.
1
Common ports & protocols
10 questions ~12 min
2
DNS & DHCP
10 questions ~12 min
3
IPv4 addressing
10 questions ~12 min
4
Network troubleshooting
10 questions ~12 min
5
OSI model
10 questions ~12 min
6
Routing basics
10 questions ~12 min
7
Subnetting
10 questions ~12 min
8
Switching & VLANs
10 questions ~12 min
9
TCP & UDP
10 questions ~12 min
10
TCP/IP model
10 questions ~12 min
What this track covers
The layer modelIP addressing and subnetsTCP and UDPDNS resolutionHTTP and HTTPSTLS handshakePorts and socketsNAT and firewallsLoad balancingDiagnosing a failed request