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What is meant by Network Resilience?

Resilience is one of the three important factors concerning networking. In this article we focus up on the network resilience.

About Network Resilience

– In terms of computer networking, it can be defined as the ability of a network by virtue of which it provides as well as maintains the service levels in case of occurrence of faults and challenges to its normal functioning.
– Targeted attacks, mis-configurations etc. pose threat and challenge to the normal functioning of a network.
– In order to increase the resilience of a network, firstly the potential risks and probable challenges need to be identified.
– After the identification, appropriate resilience metrics are defined to enable the protection for the network services.
– These services might include the following:
1. Supporting network storage
2. Supporting distributed processing
3. Maintenance services for communication services like online collaboration, video conferencing, instant messaging and so on.
4. Access to data and applications.

– In other words, network resilience forms the super-set of network survivability.
– So, the survivability is the subset of network resilience.
– The survivability of the network can be defined as its capability of fulfilling the mission assigned to it in time when even the threats like large scale natural disasters or attacks are present.
– Therefore, a systematic approach is required to build resilient networks.
– Today majority of the human applications are being served by the networks be it for a leisure purpose or a professional one.
– This has made the internet an integral part of our lives.
– But actually internet was not made for all these purposes and therefore has been exposed to a wide range of challenges.
– Its normal operation is threatened by threats such as human mistakes, malicious attacks, and natural disasters and so on.
– Distributed computing is concerned with the distributed systems. Multiple computers communicating via a network constitute a distributed system.
– Computational problems are usually solved by the use of distributed systems.
– Some techniques such as the fault – tolerant systems techniques have been applied to a great affect to optical switching.
– But still the networks remain vulnerable to the various malicious attacks, environmental challenges and mis configurations that result because of human mistakes.
– Resilience of a network is also its ability to defend against such challenges.
– Now it is more viewed as major requirement of the network design.
– Network resilience is related to a number of thematic areas like network and information security, software dependability, survivability, fault tolerance and so on.
– A lot of research has gone through these themes focused up on the development of mechanisms for increasing the resilience.
– However, few of these researches lacked a systematic view of the resilient networks.
– This unsystematic approach has led to the cultivation of an impoverished view of the resilience objectives that in turn has led to development of the ill – fitting solutions.
– Further the resilience mechanisms that are incoherently devised and deployed as cause the network to behave in an undesired manner and can also increase the complexity of management.
– At the core of the systematic approach lies a coherent resilience framework including tool sets, processes and implementation guidelines.
– This framework itself forms the basis for this systematic approach.
– This approach stresses up on the resilience being an integral and critical part of the networks.
– This approach employs a resilience control loop having following components:
1. Resilience target
2. Defensive measures
3. Challenge analysis
4. Resilience estimator
5. Resilience manager and mechanisms
6. Provided service

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