[多选] After properly configuring multiple VLANs， an administrator has decided to secure its VLAN network. Which three steps are required to secure this environment？（Choose three.）（）

A . If a port is connected to a foreign device make sure to disable CDP， DTP， RPR， PAgP， UDLP， and any other unnecessary protocols， and enable UplinkFast/BPDU guard on it.
B . Enable root guard feature to prevent a directly or indirectly connected STP-capable device from affecting the location of the root bridge.
C . Configure VTP domains appropriately or turn off VTP altogether to limit or prevent possible undesirable protocol interaction with regards to the network-wide VLAN configuration.
D . Set the native VLAN ID to match the port VLAN ID of any 802.1q trunk to prevent spoofing.
E . Disable all unused ports and place them in an unused VLAN to avoid unauthorized access.

诊断性评价改正开发期间错误的过程是（）完善性维护。适应性维护。纠错性维护。预防性维护。雷诺数在Windows Server2003系统中，当用FAT32格式化磁盘，磁盘上的（）和（）就不能设置访问权限。属于系统安全保护技术的是（）负荷分布技术。设备冗余技术。数据加密技术。系统重组技术。 After properly configuring multiple VLANs， an administrator has decided to secure its VLAN network. Which three steps are required to secure this environment？（Choose three.）（）

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[多选] After properly configuring multiple VLANs， an administrator has decided to secure its VLAN network. Which three steps are required to secure this environment？ （Choose three.）（）

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[多选] After properly configuring multiple VLANs， an administrator has decided to secure its VLAN network. Which three steps are required to secure this environment？（Choose three.）（）