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An administrator receives notice of a large number of ARP table issues. The issues began after a maintenance window 36 hours ago. The issue did not exist prior to the maintenance window.
Which change was made to the port group that is causing the ARP table issue?
A. Notify Switches was changed to No.
B. Uplink 2 was changed from Standby to Active.
C. Failback was changed to Yes.
D. Network failure detection was changed to Link status only.
Correct Answer: A
Explanation/Reference:
Explanation:
A: ARP entries are configured on a physical switch to achieve network load balancing support. When the Notify Switches option is set to No the port group has VMs using network Load Balancing in Unicast mode. When this switch is set to YES then whenever a virtual NIC is connected to the standard switch or whenever that virtual NIC’s traffic would be routed over a different physical NIC in the team because of a failover event, a notification is sent out over the network to update the lookup tables on physical switches.
Incorrect Answers:
B: A virtual switch cannot work/communicate without an uplink, so whether this setting has been changed from standby to active did not cause the ARP issues.
C: Failback is an option that is used when performing recovery this will not result in ARP issues.
D: FOR ARP issues to arise there has to be communication/ a connection and the Network Failure Detection setting will only be informative to this issue and not ARP issues.
References:
Lowe, S. & Marshall, N., Mastering VMWare vSphere 5.5, Wiley and Sons, Indianapolis, 2014, p. 382
Kajamoideen M.R., VMWare ESXi Cookbook, Packt Publishing, Birmingham, 2014, p. 100