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I have three offices connected by T1's on a Sprint MPLS WAN. Internet access is provided to all offices through a seperate T1 in my main office. Two of the routers have three entries in the configs: <br />
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ip domain-name xxx.net<br />
ip name-server xxx.xxx.xxx.xxx<br />
ip name-server xxx.xxx.xxx.xxx<br />
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One of those routers is at our main office the other is at a satellite office. Are these entries necessary? I am changing ISP's and would need to change these if they are needed.
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I have three offices connected by T1's on a Sprint MPLS WAN. Internet access is provided to all offices through a seperate T1 in my main office. Two of the routers have three entries in the configs: 

ip domain-name xxx.net
ip name-server xxx.xxx.xxx.xxx
ip name-server xxx.xxx.xxx.xxx

One of those routers is at our main office the other is at a satellite office. Are these entries necessary? I am changing ISP's and would need to change these if they are needed.

Do I need an entry in my router listing the ip name-server?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.