Understanding the network.pdf - Back to Home

AURP also provides facilities for hiding networks, internetwork
address conflicts, route path redundancy, and hop count reduction.
AURP configuration will be covered in Chapter 10.
AppleTalk Echo Protocol
AppleTalk Echo Protocol (AEP) is used for packet generation to test
node reachability and network performance. AEP uses static socket 4
as the echoer socket (receiver) and a dynamically assigned socket as
the sender. AEP supports two functions: request and reply.
NOTE
Remember, AppleTalk internetworks have a distance limitation of 15
hops.
Packets with a distance of 16 are discarded.
Name Binding Protocol
Name Binding Protocol (NBP) is the basis of AppleTalk's contextual
addressing scheme. Its purpose is to identify each network service
available on a given end-node with a symbolic name. After a service
has an entity name associated with it, it becomes an NVE. Name
registration is a process similar to dynamic address assignment. The
network service registers its name with the end-host. The end-host
then checks its name table to ensure that there is no conflict. If no
conflict is found on the local name table, the service name is
broadcast to all the nodes on the zone/cable range. If no conflict is
found, the name is used. If a conflict arises during the local and
network verification stage, the registration process is halted. After the
NVE is available, its entity name has three parts:
object:type@zone
• object is the service's symbolic name (Montana, Moe's printer,
and so on). This can be any name up to 32 characters in length.