Need help understanding how DNS should be set up...

Some time back I was advised to switch my network settings such as to start using the OpenDNS servers rather than the ISP (Comcast) servers that were setup by default... I did so, at least I did so in the Network/DNS settings on my MacBook Pro... But I just noticed today that my Airport Extreme Router has its own DNS settings and those are still set to the Comcast settings...
How does all this work??? Which DNS settings matter, the ones in the Network setup for each Mac or PC in my home network??? Or do the Router settings win over everything else???
I need a brief tutorial on how to properly set up the DNS settings not just for a computer but for an entire home network... Any feedback???? thanks...

I do appreciate the help... One other interesting thing I encountered recently... I was in Oakland airport where they have free wifi... I found myself unable to connect though I had been successful in other earlier visits there.... I got curious and played for a while... What I discovered (after an hour of trying but I had time) was that I had to change my DNS settings on my computer to an address very similar to the home page IP of the airport website... I don't recall now how I came to finally figure that out but it was happenstance more than anything... I vaguely recall me stumbling upon some message where the airport was suggesting a DNS value to use. It popped up on the screen or inside the Network settings or somewhere.. I think it was when I was walking through the connection wizard which I did several times before I had success...
But I've never had that experience in airports before... All of this shows how my ignorance of DNS keeps finding ways to impact my ability to "get connected" when here or there... Again, just another interesting DNS issue I stumbled upon recently... thanks...

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    K|<`BgÉÔºÜWs[§J�&Ñ:Ìá:´�ç«�RÐv�ÚÅAD'\�ÁtR²*DP3gî:B@JëhU�Ò'¬�ùQ\�È\D{·O×±JS\ï�-ò�¸�Þ²êó�{Å¡2®â,MmÉù XAzßüBn&®Sl-§�l¶A�×ú½³ÙFI®0¿©Ú¯¤�oT�iV²RÀJ��¼«`õ»�í Ûéwa#�àpY�««óq)U°JaøÁA�ûì>Ù³üHåÒe¾�7��Ð/§£u°Nzã÷ç4×·èãþ�¾}õ0ÙµYÄ�+J��eX\�E±ïsR%®yÜÕðsªáÚ$qÚÎÇ�Û$^%1¸AF*ý¶VÑêxÏZÏ¢U½T~Ñ®ØkW5ç×®õ¿w5¬zò:oN»�ô���íø÷úÛÙ=¬å�[ôÚ�þmczPKhÏ��i PKâE�Fzà@Æ:ws_extract_attendee_detail_p0600908soav_20150424083413.txtPKâE�FhÏ��i 5�ws_extract_CES_SAE_v3_p0600908soav_20150424084014.txtPKËö
    Thanks
    Narayanareddy B

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