📖 17. Connecting Devices and Virtual LANs

📖 From Data Communication and Networks • 115 questions available

About 17. Connecting Devices and Virtual LANs

Network interconnection devices operate at different OSI layers to extend, segment, and intelligently route traffic across network boundaries. Repeaters and hubs regenerate signals at Layer 1 but propagate collisions, bridges and switches filter frames at Layer 2 using MAC tables to create separate collision domains, routers forward packets at Layer 3 based on IP routing tables to connect disparate networks, and gateways translate protocols at higher layers for heterogeneous system integration.

Virtual LANs logically segment switched networks independent of physical topology, grouping devices by function, department, or security zone rather than geographic location. VLAN tagging (802.1Q) preserves membership across trunk links, enabling flexible reconfiguration without rewiring, while inter-VLAN routing and private VLANs enforce isolation policies, combining the simplicity of flat switching with the security and broadcast containment benefits of traditional subnetting in modern campus and data center designs.

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🔄 Last updated: 2026-08-01