Editing Network planning and design (section)

==Survivability==
Network survivability enables the network to maintain maximum network connectivity and quality of service under failure conditions. It has been one of the critical requirements in network planning and design. It involves design requirements on topology, protocol, bandwidth allocation, etc..  Topology requirement can be maintaining a minimum two-connected network against any failure of a single link or node.  Protocol requirements include using a dynamic routing protocol to reroute traffic against network dynamics during the transition of network dimensioning or equipment failures.  Bandwidth allocation requirements pro-actively allocate extra bandwidth to avoid traffic loss under failure conditions.  This topic has been actively studied in conferences, such as the International Workshop on Design of Reliable Communication Networks (DRCN).<ref>[https://ieeexplore.ieee.org/document/1275329 International Workshop on Design of Reliable Communication Networks, DRCN]</ref>