試題1

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試題2

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試題3

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試題4

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5

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試題6

以下關(guān)于安全套接層協(xié)議（SSL）的敘述中，錯誤的是（）
A、是一種應(yīng)用層安全協(xié)議
B、為TCP/IP連接提供數(shù)據(jù)加密
C、為TCP/IP連接提供服務(wù)器認證
D、提供數(shù)據(jù)安全機制

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試題7

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試題8

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試題9

網(wǎng)絡(luò)系統(tǒng)中針對海量數(shù)據(jù)的加密，通常不采用（）
A、鏈路加密
B、會話加密
C、公鑰加密
D、端對端加密

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試題10

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