Common PC Security Issues

What Windows system file, if modified by malware, is most likely responsible for redirecting domain names to incorrect IP addresses or blocking name resolution

hosts

What is the most appropriate troubleshooting step to resolve a PC repeatedly displaying alerts claiming the antivirus subscription has expired, but the antivirus dashboard is showing as active

Perform a full malware scan

What should a technician do to identify the cause of many personal files being suddenly renames with unfamiliar extensions, and several folders appearing to be missing and no longer being able to open any of the affected files

Disconnect from the network and run a full malware scan

What step should be taken when addressing a Windows PC displaying frequent alerts requesting activation of an unknown system protection tool

Run a full malware scan

What is a built-in automated Windows tool to diagnose common update problems

Windows Update Troubleshooter

What troubleshooting steps would help resolve random or frequent pop-ups displayed in a web browser

• Remove suspicious browser extensions

• Perform a malware removal scan

• Reset the browser to its default settings

What is the most likely cause a website displays a warning indicating the website’s SSL/TLS certificate is not trusted

The certificate has expired

What is a common cause a website is redirecting users to a website other than intended

DNS security issues

What actions can improve degraded web browser performance

• Reset the browser to defaults

• Close unnecessary tabs

• Empty browsers cache

• Remove suspicious extensions

• Update browser