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ccna 200-301 free.patched, laptops can become infected by worms or viruses, which are then brought back into their organization's secure network environment, where they are able to infectinfect other systems.The quarantine phase involves identifying infected machines in the contained area and disconnecting, blocking, or removing them. This phase isolates these systems to make them suitable for the treatment phase.During the treatment phase, the actively infected systems are cleared of the worm. This may include terminating the worm process, removing modified files or system settings caused by the worm, and applying the worm to the system.files or system settings caused by the worm, and patching the vulnerabilities the worm used to exploit the system. In more severe cases, a complete reinstallation of the system may be required to ensure that the worm and its by-products are removed.ensure that the worm and its by-products are removed.1.2.4.4 The SQLSlammer WormIn the case of the SQLSlammer worm, malicious traffic was detected on UDP port 1434±, a port that should normally be blocked by a firewall on the perimeter. However, most infections enter through backdoors and do not pass through firewalls, so to stop the spread of this worm, this port needs to be blocked on all devices on the internal network.Sometimes the port on which the worm spreads can be very critical to business operations. For example, when the SQL Slammer worm is spreading, some organizations cannot block UDP port 1434, because legitimate business processes use this port to access the SQL server. In this case, alternatives must be considered.If you know which network devices are using the affected port, you can consider allowing only selective access. For example, if only a few client