Most computers have three types of ports: serial, parallel, and USB. A serial port is a type of interface that connects a device to the system unit by transmitting data only one bit at a time. Serial ports usually connect devices that do not require fast data transmission rates, such as a mouse, keyboard, or modem.
I would a Standard Access control List
There are two common access lists: The standard and extended access list. With the standard access list, it creates filters only on source addresses and is commonly used for server-based filtering. They are not as powerful as extended access lists. Standard Access lists are typically used for restricting access to a router through HTTP and HTTPS.
