Dear Sir or Madam:
Both your low-level TCP/IP and your management experience should be useful in helping you make the switch into network administration (particularly the former, which is a skill in pretty high demand). A CCNP would probably be more valuable than a CCDP, because the people who design networks (where the CCDP applies) are seldom the same people who take care of them on a day-to-day basis (where the CCNP applies). If you can put together a resume and cover letter that explain how your prior experience helps to prepare you to run a network (where management is essential, both in dealing with the technology and the people who make it work), I think you will be pleasantly surprised by how marketable your combination of skills turns out to be.
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