List 2 measures to secure a network.
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Antivirus systems
Everyone is familiar with the desktop version of antivirus packages like Norton Antivirus and McAfee. The way these operate is fairly simple -- when researchers find a new virus, they figure out some unique characteristic it has (maybe a registry key it creates or a file it replaces) and out of this they write the virus "signature."
Firewalls
By far the most common security measure these days is a firewall. A lot of confusion surrounds the concept of a firewall, but it can basically be defined as any perimeter device that permits or denies traffic based on a set of rules configured by the administrator. Thus, a firewall may be as simple as a router with access lists or as complex as a set of modules distributed through the network controlled from one central location.
Everyone is familiar with the desktop version of antivirus packages like Norton Antivirus and McAfee. The way these operate is fairly simple -- when researchers find a new virus, they figure out some unique characteristic it has (maybe a registry key it creates or a file it replaces) and out of this they write the virus "signature."
Firewalls
By far the most common security measure these days is a firewall. A lot of confusion surrounds the concept of a firewall, but it can basically be defined as any perimeter device that permits or denies traffic based on a set of rules configured by the administrator. Thus, a firewall may be as simple as a router with access lists or as complex as a set of modules distributed through the network controlled from one central location.
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