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Which of the following devices can operate in multiple layers of the OSI model?
Correct Answer: B
* Understanding Switches: * Layer 2 (Data Link Layer): Traditional switches operate primarily at Layer 2, where they use MAC addresses to forward frames within a local network. * Layer 3 (Network Layer): Layer 3 switches, also known as multilayer switches, can perform routing functions using IP addresses to forward packets between different networks. * Capabilities of Multilayer Switches: * VLANs and Inter-VLAN Routing: Multilayer switches can handle VLAN (Virtual Local Area Network) configurations and perform inter-VLAN routing, enabling communication between different VLANs. * Routing Protocols: They can run routing protocols like OSPF (Open Shortest Path First) and EIGRP (Enhanced Interior Gateway Routing Protocol) to manage traffic between networks. * Comparison with Other Devices: * Hub: Operates only at Layer 1 (Physical Layer) and simply repeats incoming signals to all ports. * Transceiver: Also operates at Layer 1, converting electrical signals to optical signals and vice versa. * Modem: Primarily operates at Layer 1 and Layer 2, modulating and demodulating signals for transmission over different types of media. * Practical Application: * Multilayer switches are commonly used in enterprise networks to optimize performance and manage complex routing and switching requirements within a single device. References: * CompTIA Network+ study materials on network devices and the OSI model.
