Your home network seems to have slowed down considerably.

TheCCST Cybersecuritycourse explains that MAC address filtering is a network access control method that allows only approved device hardware addresses to connect. While not foolproof against spoofing, it can block a specific device from reconnecting to a small home network.

"MAC address filtering restricts network access to devices whose unique hardware addresses are explicitly allowed. This can be used to block known unauthorized devices from reconnecting."

(CCST Cybersecurity,Basic Network Security Concepts, Wireless Security Controls section, Cisco Networking Academy)

Ais incorrect: IP ACLs are better for controlling traffic types, not blocking specific devices at the router level.

Bis correct: It prevents the device’s hardware address from reconnecting.

Cis temporary since the host can get a new IP via DHCP.

Dmay hide the network but will not stop a determined attacker who can still detect it.