Adaptive skill practice — find your level, get sharper.

Networking practice

The stack beneath the app, layer by layer

How the network works under the application — the OSI/TCP-IP layers, TCP vs UDP and the TCP handshake/reliability/flow control, IP addressing and subnets (CIDR), NAT and routing, DNS resolution internals, the TLS handshake, and the HTTP/1.1 vs HTTP/2 vs HTTP/3 (QUIC) internals. Goes deeper than the app-level HTTP in Web Development. Part of the Developer track.

• Meets you at your level — never too easy, never too hard.

• Adapts every question to how you’re doing.

• Tracks your level over time. Skill practice, not a test.

New here? Read the Networking guide

A free 18-minute primer — the mental model, the mistakes beginners make, and what to practise first.

Curriculum

261 concepts across 36 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.

A. Layering, encapsulation and the standards process

B. IPv4 addressing and the datagram header

C. Subnetting, prefixes and CIDR

D. IPv6 addressing, autoconfiguration and transition

E. Ethernet, switching, VLANs and ARP

F. NAT, address sharing and traversal

G. TCP connections and the state machine

H. TCP reliability, flow control and congestion control

I. UDP and datagram service

J. QUIC

K. Routing: forwarding, IGPs and BGP

L. DNS

M. HTTP semantics and the three wire formats

N. HTTP caching

O. TLS 1.3 and the web PKI

P. Wireless and access networks

Q. Load balancing, proxies and the edge

R. Diagnostics, MTU and operations

S. Dual-stack connection establishment

T. Multipath TCP

U. IPv6 segment routing

V. SPF sender authorization

W. DKIM message signatures

X. DMARC alignment, policy and reporting

Y. Network Time Protocol

Z. WebSocket

AA. Long polling and server-push HTTP

AB. HTTP/3 endpoint fallback

AC. QUIC loss recovery and congestion control

AD. BGP path attributes and sessions

AE. BGP communities

AF. BGP prefix filtering

AG. RPKI origin validation

AH. BGP route leaks

AI. Autonomous-system identity

AJ. Longest-prefix forwarding

View the full curriculum →

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