Question on POP (Points of Presence ) & NAP (Network access protocol)

Can some one please answer the below question:

The Internet infrastructure includes Points of Presence (POP) and Network Access Ports (NAPs).  
What is that POP and NAP mean? and why are they used.

Thanks a lot
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scraig84Connect With a Mentor Commented:
A POP can have different meanings, but typically is referred to as a place where a phone carrier or ISP uses as a "connecting point" for customer networks.  In other words the customer's data lines come into the POP.  A particular carrier or ISP often has many POPs depending on the size of the company.

A NAP is place where ISP's hook into the Internet backbone.  There are relatively few NAPs.

Hope that helps.
gubbaAuthor Commented:
Thank you very much.
It helped me alot.
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