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Networking and the Internet

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Submitted By missjenzo
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1. What is an extranet? (Minimum word count: 30)
An extranet is an infrastructure that can control access externally. Extranet is not available to the public. The extranet is a business’s intranet that is broadened to workers outside the business. This is a great tool for companies to communicate and distribute information.
2. Describe the function of a firewall. (Minimum word count: 70)
Firewalls are programs that filter the content coming into the network. Firewalls protect a network from malicious activity including hackers that try to invade a system. If the firewall flags content that comes through the network, it will not be allowed in. Firewalls can be set up between internal networks, external networks, the Internet, etc. Businesses use various methods to control the information including packet filtering, proxy service, or stateful inspection.
3. Which tunneling protocols are commonly used by VPNs? (Minimum word count: 25)

The first tunneling protocol is Point-to-Point Tunneling Protocol (PPTP). This type of protocol allows a business to range their own network throughout private tunnels on the Internet. The second protocol is Layer 2 Tunneling Protocol (L2TP). This type of protocol supports VPN’s over the Internet, but does not provide encryption. The third type of tunneling protocol is IP Security (IPsec) that provides both encryption and authentication over the Internet.

4. Describe a differential backup. (Minimum word count: 35)
Differential backup stores the information since the network has performed the last back up for data. This can save storage space on the network and less labor time for the server. Differential backup is faster than a full backup, but they are used together to store data.
5. What is authentication? (Minimum word count: 50)
Authentication recognizes the identity of a user who logs into the

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