ESET LAN Update Server 2.7, Руководство по установке

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Administration Installation Guide
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Installing NOD32 in a multi-site network
In large networks, you can install more RA servers for easier manipulation.
The servers would create an imaginary structure. The burden connected
with communication with client workstations and RAS can be distributed.
This way you can also define sub-administrators who will control only a
group of client workstations. All transfers between servers are encrypted.
A company department network is an example of a sub-network. It is
recommended to install RAS for each department, controlling client
computers only within its own network, as seen in the illustration on the
following page.
If, from the point of view of replication, RAS 1 will be set as the main (root)
server, then all the other servers are controlled by it. According to the
figure, RAS 3 is superior to RAS 4, RAS 5, and RAS 6, as well as RAS 5 is
superior to RAS 6 (superior = ‘upper server’ in the scheme).