Mayank Desai Windows 2003 Server Notes                                                     Mayank Desai home
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Lesson 2
Using Network Load Balancing
7-29
2. Which of the following Nlb.exe commands do you use to shut down NLB opera-
tions on a cluster server without interrupting transactions currently in progress?
a. Nlb drain
b. Nlb params
c. Nlb drainstop
d. Nlb queryport
3. How long does it take a Network Load Balancing cluster to begin the convergence
process after one of the servers in the cluster fails?
Lesson Summary
Network Load Balancing works by creating a virtual network adapter with IP and
MAC addresses that represent the cluster as a single unit.
When NLB is running in unicast mode, the service replaces the network interface
adapter’s MAC address with the cluster MAC address, making ordinary communi-
cations between cluster servers impossible.
When NLB is running in multicast mode, the service uses both the network inter-
face adapter’s MAC address and the cluster MAC address, enabling cluster servers
to communicate normally.
Although NLB can function with a single network interface adapter installed in
each server, using multiple adapters in each server can prevent network perfor-
mance degradation.
NLB cluster servers transmit a heartbeat message once every second. If a server
fails to transmit five successive heartbeats, the other servers in the cluster begin
the convergence process, redistributing the incoming traffic among the remaining
servers.




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