OSI & TCP/IP Models

The layered models networking is reasoned about in — physical up to application — and where common protocols and problems live.

Read

45 min

Practice MCQs

25

Interview QA

25

Edition

v4

Editorial status

Reviewed

Relevant for

Network Engineer

Scope: Current IETF host, IPv4, IPv6, ARP, NDP, TCP, UDP, port, ICMP, PMTUD, TLS 1.3, QUIC, and Wireshark references reviewed 2026-09-04.