From Tanenbaum's Computer Networks:
Point-to-point links connect individual pairs of machines. To go from the source to the destination on a network made up of point-to-point links, short messages, called packets in certain contexts, may have to first visit one or more intermediate machines. Often multiple routes, of different lengths, are possible, so finding good ones is important in point-to-point networks.
Point-to-point transmission with exactly one sender and exactly one receiver is sometimes called unicasting.
What is the difference between point-to-point and unicasting?
What does the last sentence mean? Doesn't a point-to-point transmission always have exactly one sender and exactly one receiver?
From Tanenbaum's book
In the literature, broadcast channels are sometimes referred to as multiaccess channels or random access channels. The protocols used to determine who goes next on a multiaccess channel be- long to a sublayer of the data link layer called the MAC (Medium Access Con- trol) sublayer.
The MAC layer emulates a full-duplex logical communication channel in a multi-point network. This channel may provide unicast, multicast or broadcast communication service.
Tanenbaum seems to suggest that multiaccess and broadcast are the same, while Wikipedia says multiaccess can be unicast, multicast or broadcast. What is the difference between multiaccess and broadcast?