Problem
One of the most important functions (protocols) in a packet-switched network is ROUTING. An array of routing algorithms have been invented, and many of them implemented.
With respect to routing, the Internet is composed of inter-connected regions called autonomous systems (AS). There are 2 layers of routing in the Internet: interior and exterior routing. An interior routing protocol (IRP) operates within an AS. An exterior routing protocol (ERP) operates between AS's. IRP's and ERP's have evolved. Routing protocols may have serious security vulnerabilities that could potentially be exploited by hackers. CISCO has monopolized the router market, but is facing increasing foreign competition.
Discuss routing in the Internet and other networks (algorithms, standards, implementations, quality-of-service, security risks, router trends, etc.)