Digital Communication Security Flashcards

1
Q

Define the term virus.

A

A virus is a computer program designed to damage some aspect of an information system

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2
Q

List three methods of protecting information systems from misuse.

A
  1. Virus protection
  2. Firewalls
  3. Backups
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3
Q

List three types of virus.

A
  1. Worms
  2. Trojan horses
  3. Spyware
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4
Q

Explain how worms work.

A

Worms spread by replication.
They don’t have to be attached to a file.
They slow down processing speed as they reproduce.

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5
Q

Explain how trojan horses work.

A

Trojan horses provide an entry point into a computer system for hackers by misleading the user into thinking that they are downloading a useful program.

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6
Q

Explain how spyware works.

A

Spyware is malicious software secretly installed on a computer.
It collects personal user information over a period of time without the user’s knowledge or consent.

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7
Q

Explain how virus protection systems work.

A

They scan the computer for threats.

If the computer contains a virus, the user will be notified.

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8
Q

Explain how firewalls work.

A
  1. Firewalls monitor and control incoming and outgoing traffic on a network
  2. They can prevent hackers, viruses and spam from entering the network via the internet
  3. They can prevent users within the network from uploading to the internet
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9
Q

Explain how a backup works.

A

Backups ensure that there is a copy of the data that can be loaded on to the system if the original is lost.

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10
Q

Why should backups be carried out regularly?

A

To minimise the amount of data lost.

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11
Q

Name two places where data can be backed up to.

A
  1. Magnetic tape

2. External hard disk

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12
Q

Give three advantages of Wi-Fi

A
  1. No wires
  2. Wide range of devices use it
  3. Prices are falling
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13
Q

Give three disadvantages of Wi-Fi

A
  1. Signal strength decreases with distance
  2. Not as secure as wired
  3. Affected by the weather
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14
Q

Give three advantages of 3G

A
  1. Remains available if broadband is not
  2. Map and GPS are still available
  3. Video calling is still possible
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15
Q

Give three disadvantages of 3G

A
  1. Network coverage is required
  2. Can be expensive
  3. Causes increased power consumption
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16
Q

Give three advantages of Bluetooth

A
  1. Can penetrate solid objects
  2. Uses less power and money
  3. Can allow use of wireless headsets with phones
17
Q

Give three disadvantages of Bluetooth

A
  1. Short range
  2. Low security
  3. Lower data transmission rate than Wi-Fi or 3G