Which statement is true about data forwarding in a switch?

Which statement is true about data forwarding in a switch?

• A. A switch forwards data based on IP addresses.
• B. A switch forwards data based on MAC addresses.
• C. A switch broadcasts data to all ports without filtering.
• D. A switch connects only devices of the same manufacturer.

Answer: (B)

A switch forwards data based on MAC addresses, which is essential for its function in a local area network (LAN). When a device sends data, it includes its MAC address as the source address and the destination MAC address of the intended recipient. The switch reads the MAC address contained in the data frame, looks it up in its MAC address table, and determines the specific port to which it should forward the frame. This process allows for efficient data transmission by directing frames only to the correct destination rather than broadcasting to all ports. The ability to filter traffic using MAC addresses helps to reduce unnecessary network congestion and enhances performance. Switches learn the MAC addresses of devices on the network over time, allowing them to build and maintain an updated address table that optimizes data forwarding. In contrast, data forwarding based on IP addresses is characteristic of a router, which operates at a different layer of the OSI model. Broadcasting data without filtering is not how switches operate; they selectively forward data to specific devices based on their MAC address. Lastly, a switch does not restrict connectivity to only devices made by the same manufacturer; it operates independently of the device manufacturer, as long as the devices comply with standard networking protocols.

A switch forwards data based on MAC addresses, which is essential for its function in a local area network (LAN). When a device sends data, it includes its MAC address as the source address and the destination MAC address of the intended recipient. The switch reads the MAC address contained in the data frame, looks it up in its MAC address table, and determines the specific port to which it should forward the frame. This process allows for efficient data transmission by directing frames only to the correct destination rather than broadcasting to all ports.

The ability to filter traffic using MAC addresses helps to reduce unnecessary network congestion and enhances performance. Switches learn the MAC addresses of devices on the network over time, allowing them to build and maintain an updated address table that optimizes data forwarding.

In contrast, data forwarding based on IP addresses is characteristic of a router, which operates at a different layer of the OSI model. Broadcasting data without filtering is not how switches operate; they selectively forward data to specific devices based on their MAC address. Lastly, a switch does not restrict connectivity to only devices made by the same manufacturer; it operates independently of the device manufacturer, as long as the devices comply with standard networking protocols.