Domain name server definition

domain name server definition

A standard practice in implementing name resolution in applications is to reduce the load on the Domain Name System servers by caching results locally, or in intermediate resolver hosts. The period of validity may vary from a few seconds to days or even weeks. Results obtained from a DNS request are always associated with the time to live (TTL), an expiration time after which the results must be discarded or refreshed. The TTL is set by the administrator of the authoritative DNS server.

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Client server netzwerk definition

W-LAN mit IEEE 802.1X und RADIUS in einer Windows Server

Der Standard schlägt vor, dass T1 auf die Hälfte und T2 auf 7/8, also 87,5 % der Gültigkeitsdauer der lease time gesetzt wird. Zusammen mit der IP-Adresse erhält der Client in der DHCPACK-Nachricht neben der “lease time”, also der Gültigkeitsdauer der IP-Konfiguration, zwei Fristen: Die “renewal time” T1 und die “rebinding time” T2. Für beide Werte kann der DHCP-Server optional andere Werte vorgeben.

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Web server logs definition

web server logs definition

An organization may have many systems on the same network or under control of a single server, prohibiting the possibility of an individual connection to the Internet for each system. In such a case, the individual systems can be connected to one proxy server, and the proxy server connected to the main server. Another important use of the proxy server is to reduce the hardware cost.

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