Describe how hackers, viruses, and malware can cause havoc to your computer system, and explain how to protect against such threats
What will be an ideal response?
A hacker breaks into computer systems without permission with the intent of accessing secure or private information and uses the information for their own benefit or sells it for a profit. A computer virus is a program that attaches itself onto another program and spreads to other computers when files are exchanged. Viruses can either cause significant damage to a system, or merely be annoying. Malware, includes adware, spyware, and scareware. Adware are software programs that track your online behaviors and push unwanted advertisements to you as you browse the Web or sell it to third parties. Usually, the user has accepted terms to have the adware run in the background. Spyware tracks your online behavior without your consent and can be more intrusive. Scareware displays notification warnings that your computer is infected and prompts you to buy fake removal tools. Using antivirus software, antispyware software, and ensuring your computer is protected by an active firewall can help manage and avoid these online invaders.
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Which of the following is not a valid type of unicast address in IPv6?
A) Global B) Anycast C) Unique D) Link-local
Lossy compression is all about removing information that is not vital to the image or sound. If you have an 8 × 8 array of pixels (i.e., the normal image) it is impossible to easily remove information to compress the image. If an image is transformed into DCT coefficients, the data becomes ordered in the sense that the 64 DCT coefficients are arranged from 1 to 63 with 0 being the D.C. coefficient (the average luminance) and the other coefficients corresponding to horizontal and vertical waves of increasing frequency. The highest numbered coefficients are the highest visual frequencies and these often tend to be low values (if you photograph a sky with little detail, there are no high?frequency visual components). Consequently, you can sometimes reduce these coefficients to zero with
little effect on the image. What will be an ideal response?