Page 23 - Handout Computer Network.

Figure 2 - 6 shown a VPN Hierarchy

VPNs have the following advantages:

• A single VPN technology can provide privacy for multiple TCP/IP applications. Providing
privacy for multiple TCP/IP applications is especially important in environments in
which you want to provide secure access for partners or telecommuters.
• Encryption services can be provided for all TCP/IP communications between the
trusted client and the VPN server. This scenario has the advantage of being
transparent to the end user. Because encryption is turned on, the server can enforce
it.
• VPN provides mobility to employees and allows employees to access the corporate
network securely.
• https://www.youtube.com/watch?v=R-JUOpCgTZc&t=27s

2.6 Data Throughput

Bandwidth is the measure of the amount of information that can move through the network
in a given period of time. Therefore, the amount of available bandwidth is a critical part of the
network’s specification. A typical LAN might be built to provide 100 Mbps to every desktop
workstation, but this does not mean that each user can actually move one hundred megabits of data
through the network for every second of use. This is true only under the most ideal circumstances.
The concept of throughput can help explain why this is so.

Throughput refers to actual measured bandwidth at a specific time of day, using specific
Internet routes, and while a specific set of data is transmitted on the network. Unfortunately, for
many reasons, throughput is often far less than the maximum possible digital bandwidth of the
medium that is being used.

23