|  | 6.5 | Media Access Control (MAC)
| 6.5.5 | Three specific technical implementations and their MACs
Three common Layer 2 technologies are Token Ring, FDDI, and Ethernet. All three specify Layer 2 issues (e.g. LLC, naming, framing, and MAC), as well as Layer 1 signaling components and media issues. The specific technologies for each are as follows: Ethernet - logical bus topology (information flow is on a linear bus) and physical star or extended star (wired as a star) Token Ring - logical ring topology (in other words, information flow is controlled in a ring) and a physical star topology (in other words, it is wired as a star) FDDI - logical ring topology (information flow is controlled in a ring) and physical dual-ring topology (wired as a dual-ring)