is ccna certification free

is ccna certification free.An attacker launches a resource depletion attack to circumvent detection by access control and security detection systems. Sending a "giant stream" to an IPS is a common type of resource depletion attack.A resource depletion attack can "disable" the logging system.Throttling is a method of preventing resource exhaustion by limiting the amount of processes that can be consumed at one time.Section 14.4 will describe the attack of slicing and modifying traffic to evade detection. This attack is called traffic fragmentation (traffic fragmentation) o14.4 Traffic fragmentation networking techniques expect traffic to flow in a certain way. This is known as the TCP/IP suite. Understanding how this suite works helps the reader determine when something is working in an unusual manner. A traffic slicing attack is a method of attack that evades security detection, specifically by breaking up a single Intemet Protocol (IP) datagram into multiple small packets. The attacker creates conditions to abuse the IP protocol's fragmentation mechanism with the goal of making security detection devices blind to attacking traffic, or to let attacking traffic go as trusted traffic. However, most modern intrusion detection systems (IDSs) and intrusion prevention systems (IPSs) are able to detect and block such attacks. Best practice is to verify that the software version of your own IDS/IPS has traffic segmentation attack detection. IPS products are supposed to have the ability to reorganize packets in the correct manner, determine whether they are malicious in nature, and understand the correct order in which they are sent. However, attackers can use a variety of techniques to make IPS devices "go wrong" in the packet reassembly process. For example, there is a TCP fragmentation and reordering attack where an attacker sends malicious traffic in an unexpected way to "fool" the M IPS device, hoping that it will not be able to reorganize the traffic correctly and identify it as non-malicious. Security devices that do not have traffic reassembly capabilities are naturally unable to block traffic fragmentation attacks. When an attacker "fine-tunes" the traffic, reordering or slicing it to evade detection, it can cause some security devices to fail. Repeated slicing attacks are another form of traffic slicing attack. This attack involves "crafting" two or more duplicate sliced IP packets by "carefully" setting the value of the slicing offset field in the IP packet header.14.5 Explanation of Protocol Level Errors 499This can potentially "fool" some security detection devices and allow malicious traffic to "pass through".The best practice to avoid traffic slicing attacks is to contact the security inspection device vendor to confirm that the security inspection device purchased by the organization has traffic slicing detection capabilities. This attack is difficult to "fool" with security inspection appliances running in lull proxy type mode, such as content filtering appliances and inline security appliances.The following are important concepts related to traffic distribution attacks. (11) A traffic slicing attack modifies TCP/IP traffic in ways that are unexpected by the security detection device in order to"muddle" the security detection capabilities of such devices.