Certified Information Systems Security Professional (CISSP) Practice Exam

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What type of device is a router classified as?

Layer 1 device
Layer 2 device
Layer 3 device
Layer 4 device

The correct answer is: Layer 3 device

A router is classified as a Layer 3 device because it operates at the network layer of the OSI (Open Systems Interconnection) model. Its primary function is to route data packets between different networks based on their IP addresses. This capability enables routers to perform tasks such as determining the best path for data to travel and managing traffic within and between networks. At Layer 3, routers utilize protocols such as IP (Internet Protocol) to analyze and make forwarding decisions for incoming data packets. They can also support features like Network Address Translation (NAT) and routing tables, which are essential for directing communication across diverse networks. Understanding that routers function at Layer 3 is crucial for grasping how they interconnect different segments of a network and facilitate communication across the internet and between local area networks (LANs) and wide area networks (WANs).