Understanding Cache hits and performance issues
Video by Network NUTS, showing the concept of cache-hit, cache-miss, cache-line-fill and determining which application uses the cache in a better manner. As an application that uses cache in a better manner is going to give you a much better working experience and performance.
Calculating HDD IO capacity (BHP)
Video by Network NUTS, shows how to use the little law to calculate the IO capacity of your HDD. Very useful for taking decision on when to change the HDD as it cannot take more load of requests arriving.
DNS Cache and Tuning
Video by Network NUTS, shows how to configure a DNS server for caching, how to configure the cache size, refresh time etc. how to check the DNS query log, how to measure DNS performance and how to configure DNS to use a alternate port for query.
Understanding master.cf of Postfix
Video by Network NUTS, shows and explain the relevant and importance of master.cf file within the postfix environment. The file master.cf is the master daemon that control and launches all other services required by the postfix.
SSH Server Hardening
video by Network NUTS, shows how to harden your ssh server to protect from unwanted intrusion attempts. It also shows the better way to allow SSH login via remote connections.
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