单项选择题 The network administrator is adding a new N1Kv to the vCenter， however， the administrator does not see the new switch under the networking tab of vCenter.    The administrator issues the following command on the VSM to troubleshoot：        VSM# show svs connections  connection VC：  ip address： 10.10.10.30  remote port： 80  protocol： vmware-vim https  certificatE. default  datacenter namE. DC1  DVS uuiD. 67 32 30 50 a6 d2 49 64-9e 1c 5f 49 e3 af 55 99  config status： Disabled  operational status： Disconnected sync status： -  version： -        When attempting to fix the issue， the following error is seen：        VSM-PRI-188# conf    VSM-PRI-188（config）# svs connection VC  VSM-PRI-188（config-svs-conn）# connect  ERROR： [VMWARE-VIM] Extension key was not registered before its use        What is the cause of the error？（）

单项选择题 Given the following configuration：  port-profile type ethernet DATA-UPLINK   vmware port-group  switchport trunk allowed vlan 1-3967，4048-4093  channel-group auto mode on  no shutdown  state enabled  port-profile type ethernet MGMT-UPLINK  vmware port-group    switchport trunk allowed vlan 10-12  channel-group auto mode on  no shutdown  state enabled       VEMs are seen to be joining and then are lost from the Cisco VSM. How would you resolve this issue？（）

单项选择题 WhatistheuseofERSPANonN1kv？（）