Candidates for 70-620 should be able to operate Windows Vista, and its configuration, and one year of experience in the information technology field. The 1Y0-259 certification is very much significant administration degree for the most documented vendor Citrix. The Security+ SY0-101 test is intended for those candidates who possess as a minimum two years of experience working in a networked structure. 642-812 elucidates the functions of VLANs in a hierarchical infrastructure. 70-236 restores messaging servers as well as databases by employing Exchange Server 2007.