Explain why two name servers is the minimum number you would ever want to run in

Question

Explain why two name servers is the minimum number you would ever want to run in an organization’s networked IP environment. Consider the following factors, which can influence the total number of name servers present on a typical organization’s internetwork:

If a name server is available directly on each network or subnet in a local internetwork, routers need not become potential points of failure. Consider also that multihomed hosts make ideal locations for DNS because they can directly service all the subnets to which they’re connected.

In an environment in which diskless nodes or network computers depend on a server for network and file access, installing a name server on that particular server at a minimum makes DNS directly available to all such machines.

Where large time-sharing machines—such as mainframes, terminal servers, or clustered computers—operate, a nearby DNS server can offload name services from the big machine, yet still provide reasonable response time and service.

Running an additional name server at an off-site location— logically, at the site of the ISP from which your organization obtains an Internet connection—keeps DNS data available even if your Internet link goes down or local name servers are unavailable. A remote secondary name server provides the ultimate form of backup and helps to ensure DNS reliability.

Given the foregoing information and the fact that the organization operates three subnets at each of its Indiana locations along with a large clustered terminal server at each location, explain how XYZ might want to operate as many as nine name servers for its network

Explanation / Answer

Reasons for having two name servers is the minimum number you would ever want to run in an organization’s networked IP environment is as follows:

1. High availability, with having two nameserver we have high availability of nameservers. Suppose if primary nameserver goes down, atleast we have option to use secondary nameserver as a backup.

2. Useful in case of load sharing and load balancing of a network. Having minimum two nameserver, provide distribution of traffic of network, take helps to server client in fast and better way.

You can think of these two minimum name server as master and slave type. master nameserver changes is replicated on slave priodically.

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