Formatting is odd, with drop indent.
I would lead with "18 years in technology, 12 years in leadership. . ."
Right now it sounds like you're mid-level.
At first, I saw the two AboveNet positions as separate jobs, and was like, "3 years isn't long-term." Same with UUNET jobs.
Don't include training received in the job description. I'll assume you knew how to do the job, and you have a training section later on.
24x7x365 is assumed in any NOC. Better would be to say how you were better than the average NOC tech. Or at AboveNet, how your work mattered to the company.
At UUNET, "T1 and faster" sound feeble; "up to OC-12" sounds pretty good.
UUNET description is bullets; later jobs are prose. I personally prefer bullets, but it's purely taste.
As an engineer, include some technology bullets; you want to make sure you get keyword hits for "BGP" and "DNS" at least.
You don't need "Languages: English." I think we can assume that.
I would separate, or at least clarify, training from certification. Saying "B.A. program" makes it sound like you took classes but didn't get a degree.
AboveNet has no blank line after the heading; others do.
Qwest: Need an apostrophe: "Qwest's"
UUNET Sr. Mgr: "on-call" should be hyphenated.
Install engineer: "customer's" or "customers'" routers.
What do you want the reader to remember after reading this resume? All I'm getting is "senior network engineer," with no particular emphasis. Any particular specializations you'd like me to remember? Whether it's PM, circuit troubleshooting, routing protocols, customer service, there should be something special.
Still some positions at TWC: http://jobs.timewarnercable.com/content/locations/
Lots of former UUNET and AboveNet folks here, too.