Alexandros Papakostas

Alexandros papakostas

bookmark on deepenrich
location of Alexandros PapakostasBrno, South Moravia, Czechia
Phone number of Alexandros Papakostas+91 xxxx xxxxx
Followers of Alexandros Papakostas343 followers
  • Timeline

    Sept 2011 - Mar 2024

    Cyber Security Specialist

    AT&T
    District Brno-City, Czech Republic
    Mar 2024 - Jun 2024

    Senior Network Engineer

    LTIMindtree
    Current Company
    Sept 2024 - now

    Service Engineer

    NTS Netzwerk Telekom Service AG
  • About me

    Senior Network Engineer specializing in IT Networking and Security

  • Education

    • University of westminster

      2004 - 2008
      Bachelor of science (bs) computer communication & networks
  • Experience

    • At&t

      Sept 2011 - Mar 2024

      - Advanced troubleshooting of network and network security issues- Configuration - VPN, Firewall Policy, Static & Dynamic Routing, Patch & OS Upgrade installation on Stand alone or High-Availability cluster devices- Implementing changes on NextGen Firewalls (Checkpoint, Fortigate, Cisco ASA / Firepower, Palo Alto)- Enforcing security policies using Zscaler to ensure and protect customer's sensitive data- Conferences and live troubleshooting/captures with customer on various issues Show less - Troubleshooting and progression of faults affecting high - end MPLS solutions (PER - CER)- Provided guidance to network operation and maintenance analysts, technicians, and/or engineers.- Perform technical analysis of complex software, hardware, and transmission facilities using various diagnostic tools in support of efficient network operations.- Working knowledge of local provider's infrastructure; i.e. SDH, microwave, DACS- Focal point for other teams within AT&T- Provided training, guidance and assistance to other Tier 1 membersTechnologies used:- Frame Relay, Ethernet- MPLS troubleshooting (L3VPN, L2VPN, Fundamentals of VPLS)- QoS troubleshooting on PER and CER Show less

      • Cyber Security Specialist

        Dec 2018 - Mar 2024
      • Network Specialist

        Nov 2015 - Dec 2018
      • Network Analyst

        Aug 2013 - Nov 2015
      • Computer Network Analyst

        Sept 2011 - Jul 2013
    • Ltimindtree

      Mar 2024 - Jun 2024
      Senior network engineer

      - Working as contractor for Microsoft- Deployment of new hardware devices in Microsoft's datacenters supporting Microsoft Azure Cloud- Installation and configuration of Cisco IOS XR, Juniper and Arista routers- Ensured seamless integration of new hardware into existing network infrastructure- Testing and validation of network configurations to ensure optimal performance and security

    • Nts netzwerk telekom service ag

      Sept 2024 - now
      Service engineer
  • Licenses & Certifications

    • Jncia

      Juniper networks
      Dec 2013
    • Lpi linux essentials

      Linux academy
      Sept 2019
    • Ccna security (210-260) cert prep: 1 security concepts

      Linkedin
      May 2019
      View certificate certificate
    • Ccna routing & switching

      Cisco
      Aug 2011
    • Ccnp routing & switching

      Cisco
      Jan 2015
    • Ccna security (210-260) cert prep: 2 secure access

      Linkedin
      May 2019
      View certificate certificate
  • Honors & Awards

    • Awarded to Alexandros Papakostas
      Customer Service Week 2012 - Do it Right AT&T Oct 2012 Alex has proven a great knowledge on all subjects required to perform his job. Overall reports and monitoring have shown that Alex seems to be not capable of making any mistakes.He is a great resource for the team with his broad band of technical tips and tricks and anytime interested to improve himself and moreover the knowledge of his Team mates. Very valuable asset in the ISA Team. Stefan Grzelka, AT&T iSA Operations Manager