A non-broadcast multiple access network (NBMA) is a computer network
to which multiple hosts are attached, but data is transmitted only
directly from one computer to another single host over a virtual
circuit or across a switched fabric. NBMA networks do support
multicast or broadcast traffic manually (pseudo-broadcasts). Some
common examples of nonbroadcast network technologies include
Asynchronous Transfer Mode
Asynchronous Transfer Mode (ATM), Frame Relay, X.25, and home power
Power line networks
G.hn standard provides a specification for creating a
high-speed (up to 1 Gigabit/s) local area network using existing home
power lines, phone lines and coaxial cables.
Because of multipath propagation, power lines use frequency-selective
channels. Channel frequency response is different for each pair of
transmitter and receiver, so modulation parameters are unique for each
transmitter and receiver pair. Since each pair of devices uses a
different modulation scheme for communication, other devices may not
be able to demodulate the information sent between them.
Split horizon route advertisement
In NBMA networks a special technique called split horizon route
advertisement must[dubious – discuss] be employed by distance-vector
routing protocols in order to prevent routing loops.
This family of protocols relies on link layer broadcasting for route
advertisement propagation, so when this feature is absent, it has to
be emulated with a series of unicast transmissions, which may result
in a receiver node sending a route advertisement back to the node it
has just received it from.
Open Shortest Path First
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