Hi,
Microsoft has no security or networking specific certification. Security is part of most of the MCSA and MSCSE tracks. In the past there was a +security addition that you could earn when passing additional security exams ontop of the old MCSA/MCSE certification
but this no longer available.
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MCSE:Server Infrastructure, MCSE:Desktop Infrastructure, MCSA Server 2012, Citrix CCIA & CCEE, Cisco CCNA, VMware VCP 3/4/5 Twitter: @dnyvandam http://www.dannyvandam.net