Which three statements accurately describe a point-to-point communication link?
a. A point-to-point (or serial) communication link provides a single, pre-established WAN communications path from the customer premises through a carrier network, such as a telephone company, to a remote network.
b. Carriers usually lease point-to-point lines, which is why point-to-point lines are often called leased lines.
c. A point-to-point (or serial) line usually connects two relatively close sites.
d. For a point-to-point line, the carrier dedicates fixed transport capacity and facility hardware to the line of a customer.
e. The purpose of a DSU/CSU in a point-to-point communication link is to ensure reliable delivery of data packets over the connection.
f. Multiplexing technologies are not used in point-to-point communications.
A, B, D