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信息安全工程师每日一练试题内容(2022/1/25)
试题1: 在信息安全防护体系设计中,保证“信息系统中数据不被非法修改、破坏、丢失等”是为了达到防护体系的()目标。 安全电子交易协议SET是有VISA和MasterCard两大信用卡组织联合开发的电子商务安全协议。以下关于SET的叙述中,正确的是()
A、SET是一种基于流密码的协议
B、SET不需要可信的第三方认证中心的参与
C、SET要实现的主要目标包括保障付款安全,确定应用的互通性和达到全球市场的可接受性
D、SET通过向电子商务各参与方发放验证码来确认各方的身份,保证网上支付的安全性
在IPv4的数据报格式中,字段()最适合于携带隐藏信息
A、生存时间
B、源IP地址
C、版本
D、标识
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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