試題1

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試題2

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試題3

智能卡是指粘貼或嵌有集成電路芯片的一種便攜式卡片塑膠，智能卡的片內(nèi)操作系統(tǒng)（COS）是智能卡芯片內(nèi)的一個(gè)監(jiān)控軟件，以下不屬于COS組成部分的是（）
A、通訊管理模塊
B、數(shù)據(jù)管理模塊
C、安全管理模塊
D、文件管理模塊

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試題4

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試題5

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試題6

密碼分析學(xué)是研究密碼破譯的科學(xué)，在密碼分析過程中，破譯密文的關(guān)鍵是（）
A、截獲密文
B、截獲密文并獲得密鑰
C、截獲密文，了解加密算法和解密算法
D、截獲密文，獲得密鑰并了解解密算法

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試題7

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試題8

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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試題9

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試題10

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