I work in big russian service provider Vimpelcom (AS3216, AS8402) in NOC departament. In my competence work with Cisco, Juniper and D-link vendors(exploitation and troubleshoot).
Cisco models: catalyst 2950, 3750,3800, 4900, 7600 and etc. ASR9k, ASR1k, CRS model ,ASA and many other. Juniper MX series and dlink des series.