試題1

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試題2

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試題3

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試題4

特洛伊木馬攻擊的威脅類型屬于（）
A、授權侵犯威脅
B、滲入威脅
C、植入威脅
D、旁路控制威脅

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試題5

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試題6

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試題7

有一種原則是對信息進行均衡、全面的防護，提高整個系統(tǒng)的安全性能，該原則稱為（）
A、動態(tài)化原則
B、木桶原則
C、等級性原則
D、整體原則

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試題8

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試題9

以下關于加密技術的敘述中，錯誤的是（）
A、對稱密碼體制的加密密鑰和解密密鑰是相同的
B、密碼分析的目的就是千方百計地尋找密鑰或明文
C、對稱密碼體制中加密算法和解密算法是保密的
D、所有的密鑰都有生存周期

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試題10

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 （1）(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 （2）, the attacker inserts a large amount of （3）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 （4）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（5）the net work.

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