How does MAC filtering contribute to network efficiency?

How does MAC filtering contribute to network efficiency?

• A. It speeds up DNS resolution.
• B. It blocks all traffic from outside the network.
• C. It allows only authorized devices to connect, reducing unnecessary traffic.
• D. It automatically patches firmware.

Answer: (C)

MAC filtering works by restricting network access to devices with approved hardware (MAC) addresses. When a device without a whitelisted MAC tries to connect, the access point or switch blocks it from associating, so it cannot participate in the network. By allowing only known devices to connect, the network handles traffic from legitimate clients, reducing unnecessary airtime and processing, which can improve overall efficiency. This is especially noticeable in wireless environments where keeping unauthorized devices off the air reduces contention and wasted bandwidth. Remember, MAC filtering is not a strong security measure on its own—MAC addresses can be spoofed—so it’s best used with stronger authentication methods as part of a layered defense.

MAC filtering works by restricting network access to devices with approved hardware (MAC) addresses. When a device without a whitelisted MAC tries to connect, the access point or switch blocks it from associating, so it cannot participate in the network. By allowing only known devices to connect, the network handles traffic from legitimate clients, reducing unnecessary airtime and processing, which can improve overall efficiency. This is especially noticeable in wireless environments where keeping unauthorized devices off the air reduces contention and wasted bandwidth. Remember, MAC filtering is not a strong security measure on its own—MAC addresses can be spoofed—so it’s best used with stronger authentication methods as part of a layered defense.