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Global Knowledge Course Director and Lab Topology Architect Joey DeWiele, a specialist in Unified Communications, explains the difference between Cisco's Call Manager Express & Call Manager.

There are few (if any) networks in the world that do not implement NAT/PAT for IP version 4. IP version 6 will eliminate a lot of the need for NAT. Even though NAT is usually implemented as a firewalling function, it can be important on Cisco routers as well. From this, it is simple to conclude that understanding, designing, implementing, and troubleshooting NAT is a required skill for network engineers. The topic also appears in the CCNA examination in multiple questions and simulations.

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