🌐 Computer Networks
The layers, the handshake, congestion control and what actually happens when you type a URL — asked in almost every backend interview.
OSI & TCP/IP models
8 questionsSeven layers, four layers, and which one is real.
TCP vs UDP
10 questionsThe handshake, the teardown, and when unreliability is the feature.
Flow & congestion control
10 questionsTwo different problems that get conflated constantly.
IP addressing & routing
10 questionsSubnets, CIDR, NAT and how a packet finds its way.
DNS
10 questionsHow a name becomes an address, and what gets cached where.
HTTP & HTTPS
11 questionsMethods, status codes, versions, and what TLS actually does.
Sockets & ports
8 questionsWhat identifies a connection, and how one port serves thousands.
Network security basics
10 questionsThe attacks and defences that come up in interviews.
Reading these once won't hold
In the app these become flashcards on an expanding schedule, so you revisit each one just before you'd forget it.
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