Computer Networking goals with its classification The most important goals of computer networks are- 1)       Reliability Goals 2)       Performance Goals 3)       Security Goals 4)       Network Cast   1)        Reliability Goals:-  Network reliability can be measured by the networks robustness in a catastrophe, failure frequency    and average down time of network. These are described as follows- a)       Catastrophe b)       Failure Frequency c)        Average Down Time   a)        Catastrophe:-  Network should be protected from catastrophe events like theft or earthquake. One protection  of network against these is a reliable system to backup network software.           b)       Failure Frequency:-    A network which fails rarely is good for a user but a network which fails oftently is of little  value to a user.                 c)        Average Down Time:-   How long does it take to restore service is called down time. A network with less value of