The use of the Internet for business-critical and real-time services is growing day after day. Random node (link) failures and targeted attacks against the network affect all types of traffic, but mainly critical services. For these services, most of the time it is not possible to wait for the complete network recovery; the best approach is to act in a proactive way by improving redundancy and network robustness. In this paper, we study network resilience and propose a resilience factor to measure the network level of robustness and protection against targeted attacks. We also propose strategies to improve resilience by simple alterations in the network topology. Our proposal is compared with previous approaches, and experimental results on selected network topologies confirmed the effectiveness of the approach.
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