The <span>three special purpose devices one might find in a data center and what they do are :
</span><span>1) Load Balancer</span><span> is a device that acts as a reverse proxy and distributes network or application traffic across a number of. servers.</span><span>
2) Logical Servers are logically separate servers (e.g., a Web server, an
email server, and a file server) on the same physical computer.
</span>3) V<span>irtual Servers ran on the same physical computer </span>that shares
hardware and software resources with other operating systems (OS), they are
popular in Web hosting environments.
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Answer:
Because of the nature of the source systems ETL functions are challenging.Reasons are as following:-
1. There are various source systems are very and contrasting.
2. There is usually a requirement to deal with source systems on different platforms or Operating Systems.
3. Quality of data is uncertain in many old source systems that have developed gradually over time.