Which MAC address type is characterized by a 0 in the 7th bit?

The type of MAC address characterized by a 0 in the 7th bit is known as a Unicast (Universal) Address or UAA. In a 48-bit MAC address, the least significant bit of the first octet determines whether the address is universally or locally administered. If this bit is set to 0, it indicates a universally administered address, meaning it is assigned by a manufacturer and is unique on the network.

In contrast, if the 7th bit is set to 1, it indicates a Locally Administered Address (LAA), which is assigned by a network administrator rather than a manufacturer. The distinction is crucial for understanding how devices communicate in a network.

The other options, such as Fixed Address and Static Address, do not pertain directly to the specific bit designations of MAC addresses. While they may describe address assignment methods or the nature of an IP address, they do not fit within the framework of bit designations for MAC address types. This specificity in MAC address characterization is crucial for network design and management, making UAA the correct choice in this context.