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As suggested by title: is there possibility that after a successful DHCP session, DNS server is not configured?

Thanks,

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Are you asking if DHCP can lease addresses without giving DNS information? –  VBwhatnow Jul 16 '12 at 8:08

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Yes. A DHCP server is not required to provide DNS information when it leases an IP address.

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is there a reference? –  lang2 Jul 16 '12 at 8:21
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RFC2131 section 4.3.1: "The server MUST supply as many of the requested parameters as possible and MUST omit any parameters it cannot provide." (So technically, it is required to provide them if requested and if it can provide them. But it need not provide DNS information if it cannot provide them or if the client doesn't specifically request them.) –  David Schwartz Jul 16 '12 at 8:26

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