Yes, 2511XM routers should be sufficient for the lab. The only concern would be a size of Flash and an ability to put required IOS image with all required features. Most of the stuff you can do even with old 25xx routers.
Good luck,
Mike CCNP, CCDP, CCSP, Cisco Voice, MCSE W2K, MCSE+I, Security+, etc. CCIE R&S (in progress), CCIE Voice (in progress)
I'm not sure about "the latest" labs, but for CCNP you won't be asked anything "too version-specific". The problem with old 25xx routers is that even though newer versions available (for example 12.3), it may require to upgrade your Flash and Memory to the maximum (16/16 or 16/32), which may cost as much as the router itself, if not more. Same thing with 2600XM routers - some featuresets may not fit into the Flash.
By the way, there was a trick on 25xx routers, how to fit bigger IOS into the flash - use Linux utility "compress" to compact the file, and save the resulting file with .Z extension into the flash. Boots a little bit slower, but works just fine. May try it on 2600 routers.
Good luck,
Mike CCNP, CCDP, CCSP, Cisco Voice, MCSE W2K, MCSE+I, Security+, etc. CCIE R&S (in progress), CCIE Voice (in progress)
having completed a CCIP some years ago (meanwhile also CCIE R&S), I don´t think you´ll need a lab for CCIP.
While some certifications (like CCIE) do require a lot of hands-on experience, others like the CCIP only require learning. There were no simulations/hands-on-tasks etc. (like in CCNA).
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