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-ia merupakan sistem backup method untuk meliundungi network apabila failure

· Minimal redudancy
o Beroperasi 1 shif dalam 1 hari
o Downtime mudah iaitu lepas waktu bekerja
o Mengalami sedikit kerugian bila network failure

· Median redundancy
o Beroperasi 2 shif dalam sehari
o Downtime ikut jadual pada hari minggu
o Mengalami kerugian agak besar bila network failure

· High redundancy
o Beroperasi 24 jam, 7 hari seminggu
o Downtime sukar kena ikut jadual
o Mengalami kerugian sangat besar jika berlaku kegagalan dalam network

· Network device
· Power supply
· Fan
· Processer

1. Network link-refer to physical redundant connection between network device
2. Data path redundancy-refer to the software protocols that data travel over network.

· Hot backup
o Physical is already in place
· Parallelism
o Uses the routing protokol that run on the network

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