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This document outlines the topics covered in 5 units that make up an introduction to computer networks. Unit I introduces network types, models like TCP/IP and OSI, and the physical layer. Unit II covers data link layer addressing, protocols, and media access control. Unit III discusses network layer services, packet switching, IP addressing, routing algorithms, and multicasting. Unit IV is about transport layer protocols, services, and UDP and TCP. Unit V examines application layer protocols including HTTP, FTP, email, DNS, and SNMP.