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单选题
Which of the following network devices should be installed at a data center to intelligently distribute client connections to a pool of servers?（）
A
A proxy server
B
A load balancer
C
A layer two switch
D
A multilayer switch
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单选题Layer 3 （the network layer） provides connectivity and path selection between two host systems that may be located on geographically separated networks. Which two devices operate at the network layer？（）A
applicationB
hubC
switchD
bridgeE
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Define the Data Center as an OSPF NSSA area， advertising a default route into the DC And summarizing the routes out of the NSSA to the Campus CoreD
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In each data center， deploy one Hub Transport server. Create and configure one Send connector.B
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In each data center， deploy two Edge Transport servers. Create and configure two Send connectors.
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Configure a failover cluster.B
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Create a Network Load Balancing cluster.D
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单选题You replaced your Layer 3 switch， which is the default gateway of the end users. Many users cannot access anything now， including email， Internet， and other applications， although other users do not have any issues. All of the applications are hosted in an outsourced data center. In order to fix the problem， which one of these actions should you take？ （）A
Clear the MAC address table in the switch.B
Clear the ARP cache in the switch.C
Clear the ARP cache in the end devices.D
Clear the ARP cache in the application servers.
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Clear the MAC address table in the switch.B
Clear the ARP cache in the switch.C
Clear the ARP cache in the end devices.D
Clear the ARP cache in the application servers.
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