There are different ways to perform IP based DoS Attacks.The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment（）(e.g.TCP SYN requests)to establish hanging connections with the controller or a DPS.Such a way,the attacker can consume the network resources which should be available for legitimate users.In other（）,the attacker inserts a large amount of（）packets to the data plane by spoofing all or part of the header fields with random values.These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources.In some cases,an（）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources.Moreover,the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.
Legacy?mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment.Moreover,legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller.These features minimize both the impact and propagation of DoS attacks.Moreover,the legacy backhaul devices are controlled as a joint effort of multiple network element.For instance,a single Long Term Evilution（LTE）eNodeB?is connected up to 32 MMEs.Therefore,DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（）the network.
问题1选项
A.message
B.information
C.request
D.date
问题2选项
A.methods
B.cases
C.hands
D.sections
问题3选项
A.bad
B.cases
C.fake
D.new
问题4选项
A.or
B.administrator
C.editor
D.attacker
问题5选项
A.or
B.of
C.in
D.to
在几种不同类型的软件维护中，通常情况下（）所占工作量最大。
在()中，项目经理的权力是最小的。
在项目实施的过程中，项目经理通过项目周报中的项目进度分析图表发现机房施工进度有延期风险。项目经理立即组织相关人员进行分析，下达了关于改进措施的书面指令。该指令属于（ ）
The IT service manager resigns from a project that meets the scheduleand budget. After hiring an alternativenew manager, the team is opposed to the comments from the new manager. The team is at （） developmentstages。
（）is closet to Deming's definition of Quality。
The IT service manager has learned that a software canimprove the efficiency of current and future project tasks. Because the software is fresh to the Company. Theengineer is not familiar with the software. The lT service manager decides to send the highest level engineero attend the external training course. The proiect manager uses （） risk strategies。
The process control charts are used （）。
