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【信息安全工程师202011】【3-7】
阅读下列说明，回答问题1至问题5，将解答填入答题纸的对应栏内。
【说明】
防火墙作为网络安全防护的第一道屏障，通常用一系列的规则来实现网络攻击数据包的过滤。

真题详情及解析

【信息安全工程师201805】【5-9】
阅读下列说明和图，回答问题1至问题5，将解答写在答题纸的对应栏内。
【说明】
入侵检测系统（IDS）和入侵防护系统（IPS）是两种重要的网络安全防御手段，IDS注重的是网络安全状况的监管，IPS则注重对入侵行为的控制。

真题详情及解析

【信息安全工程师201611】【21】有一种攻击是不断对网络服务系统进行干扰，改变其正常的作业流程，执行无关程序使系统响应减慢甚至瘫痪，这种攻击叫做（21）。

真题详情及解析

【信息安全工程师201705】【71-75】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 （71）（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 （72）， the attacker inserts a large amount of （73）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 （74）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（75）the net work.

真题详情及解析

【信息安全工程师201805】【21】（21）是一种通过不断对网络服务系统进行干扰，影响其正常的作业流程，使系统响应减慢甚至瘫痪的攻击方式。

真题详情及解析

【信息安全工程师201905】【67】（67）攻击是指借助于客户机/服务器技术，将多个计算机联合起来作为攻击平台，对一个或多个目标发动DoS攻击，从而成倍地提高拒绝服务攻击的威力。

真题详情及解析

【信息安全工程师202111】【12】拒绝服务攻击是指攻击者利用系统的缺陷，执行一些恶意的操作，使得合法的系统用户不能及时得到应得的服务或系统资源。以下给出的攻击方式中，不属于拒绝服务攻击的是（12）。

真题详情及解析