ccna 200-301 exam test

ccna 200-301 exam test.Despite the emergence of mitigation techniques over the years, worms continue to evolve with the Internet - and continue to pose a threat to it. Worms have become more sophisticated over time, but they still tend to be based on exploiting weaknesses in software applications. There are 3 main components to most worm attacks.Enabling vulnerabilities - worms install themselves on vulnerable systems using exploit mechanisms (email attachments, executables, Trojan horses)itself. Propagation mechanisms - After entering the device, the worm replicates itself and locates new targets. Payload - any malicious code that causes certain behavior. used in most cases to create a backdoor on the infected host.Worms are self-contained programs that attack a system to exploit a known vulnerability. Once the exploit is successful, the worm copies itself from the attacking host to the new exploited system, starting a new cycle.1.2.2.3 Comparison of Worm and Virus AttacksIn a study of malware attacks over the past 20 years, it was found that the various phases of the attack methods used by hackers are often very similar. Probe phase (Probe) - Identify vulnerable targets and find computers that can be compromised. Internet ControlMessage Protocol (ICMP) ping scans can be used to understand the network, and then applications scan and identify operating systems and vulnerable software. Hackers can use social engineering, dictionary attacks, brute force cracking, or network sniffing to get passwords.Penetrate -------------- delivers malicious code to a vulnerable target, causing the target to execute the malicious code through an attackvector. The attack vector can be a buffer overflow, an ActiveX or CommonGateway Interface (CGI) vulnerability, or an email virus.Persist - When an attack is successfully launched from memory, the code tries to remain on the target system to ensure that it is ready for execution.