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This module covers network types, network optimization, network ports and protocols and routing and switching. The types of network topologies are: bus, ring, mesh, star, and tree. The instructor greatly emphasizes that many local area networks (LANs) make a Wide Area Network (WAN). The network types are Intranet, Internet and Extranet (perimeter network, DMZ). The module also covers the aspects of network optimization such as load balance, bandwidth, latency, compression and caching. The module ends with network ports and protocols, discussing common ports and routing and switching.