maximum transmission unit (MTU).

Maximum packet size, in bytes, that a particular interface can handle.

Media Access Control (MAC) address.

Standardized data link layer address that is required for every port or device that connects to a LAN. Other devices in the network use these addresses to locate specific ports in the network and to create and update routing tables and data structures. MAC addresses are 6 bytes long and are controlled by the IEEE.

metropolitan area network (MAN).

Network that spans a defined metropolitan or regional area; smaller than a WAN but larger than a LAN.

multidwelling units (MDUs).

Buildings that contain multiple housing units, such as apartment complexes and university dormitories.

multiple service operator (MSO

Get Metro Ethernet now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.