Sotiris Charisis Email & Phone Number

Dublin, County Dublin, Ireland

Supporting business customer's infrastructure, including technologies such as Routing, Switching, WiFi, WAN Accelerators, load balancers, as well as Software-defined WAN (SD-WAN).Supporting VPN solutions, EVPN, AVPN, AVTSWorking with WAN protocols, PPP, ATM, Ethernet and EGP protocols, BGP.Working with IGP protocols such as EIGRP, OSPF and redundancy protocols, HSRP, VRRP, GLBP.Tunneling protocols, GRE, IPSEC, DMVPN.Analyzing and resolving circuit issues, using MGX and Provider Edge (PE) routers.Worked as Shift Leader on a rotational 24x7 schedule, supervising a team of 8 agents, resolving customer complaints and acting as escalation contact.Experience with Cisco, Juniper, Catalyst, Nexus and Riverbed devices among others.

District Brno-City, Czech Republic

Worked on behalf of AT&T as tier 2 network engineer.Network troubleshooting / Investigating, analyzing and solving customer network underlying problems.Communication and coordination with customers, local providers and partner teams in order to isolate and resolve technical faults.

Athens (Greece)

International event, with a number of 3000 users and 40 Venues IP MPLS VPN network where data & VoIP services were provided.Installation, configuration and monitoring the network & communication systems and providing support to the users.Worked in a venue being the sole and unique responsible for the installation, partial configuration, monitoring and troubleshooting the local network infrastructure.Equipment used consisted mostly of Cisco products such as 1941 & 2951 routers, 2960s & 3750x switches, 1131 &1142 Access Points, Call Manager, 6900 & 7900 series IP Phones and others