Network Security Analyst with expertise in resolving network security incidents, managing firewall and proxy configurations, and overseeing their monitoring, maintenance, and troubleshooting. 

Key Skills

Bluecoat/Broadcom Proxy
Checkpoint Firewall
Symantec Management Center
Citrix NetScaler Load Balancer
Zscaler Proxy
Wireshark
Splunk

Professional Experience

May 2019
Present
Network Security Administrator
EY Thiruvananthapuram, IN

  • Monitoring and maintenance of Checkpoint firewalls (standalone, 41000 and 61000 series, Maestro) and associated management systems.
  • Implementing changes to firewalls, creating security policies/rules, and updating NAT policies/routing configurations.
  • Handling incident tickets, troubleshooting, and resolving security incidents as part of daily operational tasks.
  • Managing work requests (via ServiceNow) related to security incidents.
  • Providing support for network infrastructure and migration activities from the firewall/proxy perspective.
  • Implementing proxy change requests.
  • Performing Checkpoint firewall OS version upgrades and hotfix installations.
  • Managing Symantec Management Center and proxy policy-related changes.

Nov 2015
Jun 2019
Network Security Administrator
Allianz Thiruvananthapuram, IN

  • Administered and troubleshot Bluecoat/Broadcom proxy servers, managed PAC file entries, and CAS servers.
  • Upgraded Bluecoat Proxy SGOS and CAS OS.
  • Provided technical assistance for migrating new operational entities to the Broadcom/Symantec/Bluecoat proxy infrastructure.
  • Troubleshot Citrix NetScaler configurations for load balancing backend proxy devices.
  • Performed updates to the proxy rule base, including central, local, forward, and VPM files, and implemented route changes based on client requirements.
  • Diagnosed connection issues using policy trace analysis and Wireshark packet captures.
  • Implemented firewall changes, created security policies/rules, and updated NAT policies/routing configurations.
  • Handled incident tickets and resolved security incidents as part of daily operations.
 

Jun 2011
Dec 2015
Network Support Engineer
EY Thiruvananthapuram, IN
 
  •  Administering, troubleshooting, and managing the Network device services. 
  • Interacted with various ISPs to conduct latency checks and monitor link utilization, managing various leased lines connected to EY offices.
  • Managed VLAN configurations.
  • Ensured DHCP services were consistently operational and stable.
  •  Experienced in troubleshooting load balancer technology. 
  •  Experienced in working with Riverbed WAN Optimization controllers. 
  •  Remotely managed global data center devices, including GWAN, IVPN routers, and core switches. 
  • Oversaw Bluecoat Proxy management, including monitoring internet link utilization, providing internet access privileges, and whitelisting required URLs in the proxy.
  •  Collaborated with the Level 3 team to address and resolve network-related issues. 
  • Collaborated with the Security Operations team on Checkpoint firewall or Bluecoat proxy-related issues.
  •  Performed network monitoring and compiled reports on bandwidth utilization and network performance. 
 
Apr 2010
Jul 2011
Network Support Engineer
Capstocks and Securities Thiruvananthapuram, IN
 
  • Maintained the LAN and IP database for the location.
  • Configured VLAN settings.
  • Monitored the network using third-party monitoring tools.
  • Addressed maintenance issues with VSAT, VPN, and OFC connectivity.
  • Performed server backups utilizing backup utilities.
  • Coordinated with service providers to update the server database.
  • Set up the LAN and configured systems with company-specific applications.
  • Managed end-user support calls.
  • Generated bandwidth utilization and network performance reports.
  • Coordinated with ISPs for network service management.
  • Liaised with vendors for the procurement and maintenance of IT-related equipment.
 

Education

May 2001
Aug 2006
BE ( E&C) in K.V.G College of Engineering
Visveswaraiah Technological University

Certifications

2024
CISSP
ISC2
2014
Cisco Certified Network Associate (CCNA)
Cisco

Hobbies & Interests

  • Badminton
  • Football

Languages

English
(Fluent)
Hindi
(Basic)
Malayalam
(Native)

Get in touch with Sumesh