試題1

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試題2

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試題3

以下關(guān)于認證技術(shù)的敘述中，錯誤的是（）
A、指紋識別技術(shù)的利用可以分為驗證和識別
B、數(shù)字簽名是十六進制的字符串
C、身份認證是用來對信息系統(tǒng)中實體的合法性進行驗證的方法
D、消息認證能夠確定接收方收到的消息是否被篡改過

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試題4

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試題5

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試題6

以下網(wǎng)絡(luò)攻擊中，（）屬于被動攻擊
A、拒絕服務(wù)攻擊
B、重放
C、假冒
D、流量分析

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試題7

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8

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試題9

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試題10

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