Which two statemets are true？（） DPT/RPR uses a bi-directional ring consisting of two symmetric counter rotating fibre rings.。 DPT/RPR is defined in the IEEE 802.17 standard and it uses Token Bucket system to avoid collisions on the fiber.。 In DPT/RPR rings， data packets can be sent in one direction （downstream） and the corresponding control packets in the opposite direction （upstream），thus using both fibres concurrently to maximise bandwidth.。 DPT/RPR can be deployed in the Core of the SP networks where point-to-point POS links are used tomake best use of the Bandwidth.。
直接知觉
The Company network administrator needs to enable VTP pruning within the Company network. What action should a network administrator take to enable VTP pruning on an entire management domain？（） Enable VTP pruning on any switch in the management domain。 Enable VTP pruning on any client switch in the domain。 Enable VTP pruning on a VTP server in the management domain。 Enable VTP pruning on every switch in the domain。 None of the other alternatives apply。
什么是动校正？什么是静校正？
You are the network administrator of a medium-sized company， and users are complaining that they cannot send emails to some organizations. During your troubleshooting， you notice that your DNS MX record is blacklisted by several public blacklist filters. After clearing these listings for your IP address， and assuming that your email server has the right virus protection in place， what are two possible solutions to prevent this from happening in the future？（） Change your Internet provider.。 Change your public IP address.。 Allow the email server to send traffic only to TCP port 25.。 Put your email server in a DMZ.。 Use a separate public IP address for your email server only.。
教育法律规范的结构通常包括假定、（）、奖惩三部分。
