Cache & DNS with WAN in window server 2008 r2

WHAT IS HOST RECORD

DNS resources record are the information recorder that is available in the network & their are different's type of DNS server.

1. "A" Host record => IP Address (royal - 10.0.0.1 --> 32 bit resources record because it is running on IPV4 so it's 32 bit .
2. 'AAA' resources --> 128 bit (IPV6).
3. SOA -- Start Of Authority Resources record provide startup information to a usefull to transfer zones from PDNS to DNS . SOA --> royal.shampe.com.
4. NS resources record name of same DNS server name -  rahul.shampe.com + IP Address.
5. MX resources record - Mail exchange or resources record as eg - rahul@shampe.com - IP Adress.
6. PRR -Point Resources Record created under the server look-up to security purpose with exchange  server.
7. SRV record :- Service Location Record .

              WHAT IS AIDEP ?

Which protocol is used by the Active Directory to directory services. It works on 389 port no & KERORAS work on 88 port no.

              Which work cache do in DNS :- Cache only DNS does not provide any kind of PDNS or SDNS services but it will store internet query in its cache & reply fairly to the client PC . Because it has root host & forward ness.

We can use cache for two purposes:- I) Internet connectivity.
                                                        II) B/O & H/O connectivity .

By default every DNS server acts as cache only DNS.

1. Recursive query from client to dns,
2. Inharitive query -  Local DNS to ROOT server.
3. Referral query - Root server provide ip add of the .com.
4. Inharitive - Local DNS to .com.
5. Referral  query - com to local DNS .
6. Inharitive query - DNS to your website name.
7. Referral query - site name to local DNS.
8. Respond back to requesting client one recursive query will be performed & page will open. 

  NOTE:- To clear cache with command ==> Write ipconfig \flushdns in cmd prompt

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