when we use DNS Server .. ?

165 pts.
Tags:
DNS
DNS server
Network Shared Folder
Hi,i need help regarding clarification for certain points in DNS Server.
 
1. When we search some shared folder \192.168.0.99 in this request do we contact dns server, and what if this ip belongs to our server DC
2. When user name : sam@xyz.com, then does it contact dns server for validation.
Please help ....
ASKED: May 15, 2010  11:52 PM
UPDATED: May 18, 2010  3:25 PM

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1) If you search \\IP-ADDRESS you are not using DNS. You are using just straight routing and your Gateway is directing you to where you need to go.

2) By utilizing “sam@xyz.com”, then you are utilizing DNS to locate the nearest domain controller (if site and services configured) for the lookup of this request.

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  • Stevesz
    DNS is used for name resolution, to translate a name to an IP address. If you use an IP address to connect to another machine on your network or the Internet, DNS is not needed nor used. If you use a name, then a DNS server is contacted so that the name can be translated into an IP address, then the machine in question can be found. Your first example, contacting a machine with the IP address of 192.168.0.99 would not use DNS, but directly be routed to the machine in question. Your second example is not areal good one, since it involves an e-mail address. Only the portion after the @ is relevant to DNS look-up. "xyz.com" would be routed to the IP address returned by DNS as determined by the MX record contained in the DNS entry for that domain. It is possible that a domain could have more than one DNS return, depending on the protocol being used. E-mail depends upon the presence of an MX record, pointing it to an IP address where the mail server is located. If you were looking for the web site of the domain -- www.xyz.com -- it may have a completely different IP address. If there is a PTR record for a domain, one can then find what the domain a particular IP address is attached to. For instance, looking for the reverse DNS (rDNS is what this is commonly called) for 1.2.3.4 would return, to use your second example, something tha my look like mail.xyz.com. Many networks have an internal DNS, run on one or more servers. This is where the inital DNS look-up is performed. (On a serverless network--a peer to peer network--where there is no server, the HOSTS file on the local machines can be used as a "poor man's" DNS. You would need to place entries in there manually, but it would allow you to use the name of a machine to connect to that machine.) If the canonical name is not found in the local DNS, the request would be forwarded to an external DNS server for resolution. There are 13 root servers. The root servers hold the lists of names and addresses for the authoritative servers for all of the top-level domains. Any query to a DNS server results in a return that, at one point, came from one of those thirteen servers. As you can see, this can be a very interesting subject to delve into, and it is not really quite so simple and easy as many people think it is, it just seems that way.
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