题目内容

生殖细胞瘤与松果体瘤鉴别，以下哪一项CT表现有利于生殖细胞瘤的诊断（）

A. 肿瘤位于三脑室后部
B. 肿瘤中度增强
C. 松果体钙化被肿瘤包围
D. 松果体钙化移位
E. 脑积水

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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.
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.

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