Which of the following statements concerning use of switches in a local area network is valid?

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BlackTom AI · Accepted Answer

Topic here is the behavior and role of switches in a local area network. 
Option a: 'Switch is based on full duplex communication where it can send and receive data simultaneously.' This is accurate because modern switches typically operate in full duplex mode, allowing simultaneous two-way communication between devices, effectively doubling potential throughput compared to half-duplex. 
Option b: 'Switch is using IP address identification to determine the sender and receiver of every data.' This is misleading. Switches operate primarily at the data link layer (Layer 2) and use MAC addresses to forward frames. IP addresses are used by layer 3 devices (routers) to determine end destinations, not switches, which do not need IP addresses to forward frames unless they are managed switches with IP management features. 
Option c: 'Every time a switch receives any data, it will broadcast to all hosts in the same local area network.' This describes a hub behavior, not a switch. A switch learns MAC addresses and forwards frames only to the appropriate destination port, reducing unnecessary broadcast and improving efficiency. Exceptions occur when the destination is unknown, in which case the frame may be flooded temporarily, but normal operation is targeted forwarding, not universal broadcasting. 
Option d: 'Switch can be used to connect different local area networks together.' This describes the function of a router or layer-3 device more than a basic switch. Switches primarily connect devices within the same LAN; inter-LAN connectivity typically relies on routers or Layer 3 switches with routing capabilities. 
Overall, the options test distinct aspects of switch function: duplex operation, forwarding based on MAC addresses rather than IPs, targeted frame delivery versus broadcasting, and the typical scope of LAN connectivity versus inter-network routing. Each incorrect choice highlights a common misconception: equating switches with hubs, misplacing IP-based forwarding, or misattributing WAN/LAN interconnect roles to switches.

Introduction to Networking (032025-TGK) Mock Exam

Which of the following statements concerning use of switches in a local area network is valid?

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