Page 26 - M. Abrahim Thesis

Chapter (2) Network Fundamental and Layered Network Architecture

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.

30