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How it is possible to ping localhost when there is no network card. enter image description here

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localhost is an internal IP address, which is handled directly by the kernel. No external network is involved (thus no network card). Is is used to handle "network" connections to the same machine. –  vonbrand Mar 14 '13 at 9:58

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up vote 3 down vote accepted

The loopback adaptor has nothing to do with any physical hardware: it's a service provided internally by the operating system.

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Thanks for your quick response –  Hemc Mar 14 '13 at 9:28

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