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2. You want to be able to use Network Load Balancing Manager, running on one of the Web servers, to configure all the servers in the NLB cluster. Other than this, very little noncluster communication between the Web servers is required. Which of the following communication models should you use to make this possible with the greatest economy Explain your answer. a. Single network interface adapter in unicast mode b. Single network interface adapter in multicast mode c. Multiple network interface adapters in unicast mode d. Multiple network interface adapters in multicast mode 3. Which of the following storage hardware configurations should you use for the 4-node database server cluster Explain your answer. a. Install a SCSI host adapter in each server and connect them all to a single SCSI bus b. Install a SCSI host adapter in each server and connect them all to a SCSI hub c. Install a Fibre Channel adapter in each server and connect them in an arbi trated loop d. Install a Fibre Channel adapter in each server and connect them all to a Fibre Channel switch 4. You have decided to partition your database server application to spread the load among the servers in the cluster. Which of the following failover policies will ensure that the entire database is constantly available without any server running multiple partitions, even if two servers fail Explain your answer. a. Failover pairs. Split the database into two partitions and assign each one to an active server. Then, configure each of the active servers to fail over to one of the two remaining servers. b. Hot-standby server. Split the database into three partitions and assign each one to an active server. Then, configure each of the active servers to fail over to the one remaining server. c. N+I. Split the database into two partitions and assign each one to an active server. Then, configure each of the active servers to fail over to either one of the two remaining servers. d. Failover ring. Split the database into four partitions and assign each one to an active server. Then, configure each of the four servers to failover to the next server. 5. If you need to expand the server cluster, how many more servers can you add
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You are a network administrator who has recently installed a four-node Network Load Balancing cluster on the company internetwork. The cluster provides fault tolerance for the company s Internet Web servers. The cluster servers are located on a dedicated LAN in the building s basement data center, with routers connecting the LAN to the Internet and to the rest of the company network. When you installed the cluster, you used multicast mode on the servers so that they could communicate with each other. However, you now discover that when you try to use the Network Load Balancing Manager application on your office workstation on the third floor, you cannot connect to any of the cluster servers. For each of the following procedures, state whether it might resolve the problem and explain your answer. 1. Reconfigure the Network Load Balancing cluster servers to use unicast mode rather than multicast mode.
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2. Install a second network interface adapter in each Network Load Balancing cluster server.
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3. Replace the router connecting the Web server LAN to the company network with a computer running Windows Server 2003 that you have configured to function as a router.
Summary
A cluster is a group of servers that appears to users as a single resource and which provides high availability, reliability, and scalability for specific applications. A server cluster is a group of servers running a stateful application, such as a database server, and sharing a common data store. Servers in this type of cluster can be configured as active or passive nodes. A Network Load Balancing cluster is a group of servers running a stateless applica tion, such as a Web server, each of which has an identical, independent data store.
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