Cisco Certified Network Professional (CCNP) is an intermediate-level certification in the Cisco certified professional program. This certification is aimed at full-time network or system administrators, or those who work with local and/or wide-area network (LAN/WAN) infrastructure.

Firewall is a software or hardware device that protects your computer from being attacked over the internet by hackers, viruses, and worms. This may occur either at a large corporate network, or simply at a small home network; both have the same security issues.

A Content Delivery Network (CDN) is a system of the network that deliver pages and other Web content to a user, based on the geographic locations of the user, the origin of the webpage and the content delivery server.
In other words, CDN is generally used to take in web content from others webpage based on the geographic locations of that user to the origin user webpage.