試題1

以下關(guān)于數(shù)字證書(shū)的敘述中，錯(cuò)誤的是（）
A、證書(shū)通常由CA安全認(rèn)證中心發(fā)放
B、證書(shū)攜帶持有者的公開(kāi)密鑰
C、證書(shū)的有效性可以通過(guò)驗(yàn)證持有者的簽名
D、證書(shū)通常攜帶CA的公開(kāi)密鑰

查看答案

試題2

查看答案

試題3

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.

查看答案

試題4

查看答案

試題5

查看答案

試題6

67mod119的逆元是（）
A、52
B、67
C、16
D、19

查看答案

試題7

查看答案

試題8

甲不但懷疑乙發(fā)給他的被人篡改，而且懷疑乙的公鑰也是被人冒充的，為了消除甲的疑慮，甲和乙決定找一個(gè)雙方都信任的第三方來(lái)簽發(fā)數(shù)字證書(shū)，這個(gè)第三方為（）
A、國(guó)際電信聯(lián)盟電信標(biāo)準(zhǔn)分部（ITU-T）
B、國(guó)家安全局（NSA）
C、認(rèn)證中心（CA）
D、國(guó)家標(biāo)準(zhǔn)化組織（ISO）

查看答案

試題9

查看答案

試題10

查看答案