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.
正确答案:B,C,E
答案解析:有
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