F5 BigIP LTM/GTM & Citrix NetScaler ADC
Resume:
Doug T Truong
***********@*****.***
Sachse, Texas 75048
1
Professional Summary
**-**** ***** ** *****-on experience in both capacity as network administrator and engineer supporting F5 BigIP LTM/GTM/APM and Citrix NetScaler application delivery controllers (ADC), Cisco routers, switches, and firewalls, including the ASA 5500-series platform. Built virtual firewalls and DMZ's as well as set up NAT and ACL rules using both the CLI and ASDM interface to install security rule sets.
20-plus years of experience managing and supporting Cisco's Layer 2 and Layer 3 devices, including the Nexus 9K and 7K, 5K, 2K, and FEX switches. Built VDC's, built virtual switches based on the 4500-series platforms, as well as configured Layer 2 and Layer 3 interfaces connecting end nodes to the core and distribution switches.
20-plus years of experience using various monitoring applications to manage network devices.
20-plus years of experience documenting operational and engineering tasks, procedures, and configurations.
20-plus years of experience providing engineering, operations and supporting large enterprise networks.
20-plus years of ITIL experience - Change Management, Configuration Management, Incident and Problem Management.
15-plus years of experience managing and configuring F5 BigIP (v16.1.0) and Citrix NetScaler ADC (v13.1) ADC. Configured APM and LTM policies, SLB virtual servers, custom monitors, pools, installed SSL certificates, and configured GSLB solutions. Assisted application owners with the management of SSL certificates life-cycle.
15-plus years of experience configuring Cisco ASR to turn up WAN connectivity. Investigated and resolved BGP adjacency and ISP outages.
15-plus years of experience in data center support. Performed hardware and power supply replacement as part of the RMA process.
15-plus years of experience managing and configuring ACL and security policies and rule sets.
3-plus years of hands-on experience working with Palo Alto firewalls and used Panorama to manage these devices.
Performed numerous packet captures on the Cisco ASA and F5/NetScaler ADC to help troubleshoot/resolve all filtering and data flow issues.
Conducted numerous analyses and generated reports on network configurations and assisted various employers with lifecycle management of Layer 2 to Layer 4 networking devices (routers, switches, firewalls) as well as Layer 5 to Layer 7 application firewalls (application delivery controller) in order to address any resiliency concerns or vulnerabilities. Some of these involved hardware upgrades and migration to mitigate and address end-of-life/end- of-sales/end-of-support on these same network devices.
Implemented thousands of firmware upgrades on Layer 2 to Layer 4 network devices to address and mitigate any security vulnerabilities that were discovered by the vendor. Also performed thousands of MACD changes as part of the network implementation and administration processes. Education
University of Michigan, Ann Arbor, MI - B.A., Economics, September 1988 – May 1994.
Technical Training Intensified, Antioch, CA – Fundamentals of Wide Area Network. August 1997.
Geotrain Corporation, San Francisco, CA – Introduction to Cisco Router Configuration (September 1997). Cisco Router Installation and Maintenance (October 1997). Advanced Cisco Router Configuration (December 1997). Cisco Internetwork Troubleshooting (January 1998). Cisco ATM Solutions (September 1998). Cisco Internetwork Design (October 1998).
Network Associates, Cupertino, CA – Troubleshooting with the Sniffer Network Analyzer (January 1998).
Sequoia Networks, Cupertino, CA – Narrowband/Broadband Network Operations: IGX/BPX (February 1998). Cisco Strataview Plus Network Operations (March 1998). Multiband Service and Switch Configuration (May 2000).
Global Knowledge (Online) – Introduction to Cisco ACI and SDN (December 2023).
F5 (Online) – BIG-IP Administration Install, Initial Configuration, and Upgrade (F5CAB1) (June 2012). BIG-IP Administration Support and Troubleshooting (F5CAB5) (June 2012). Configuring BIG-IP APM: Access Policy Manager (March 2025). Upgrading BIG-IP to v17.5 (May 2025).
Citrix (Online) – CNS-225: Deploy and Manage NetScaler 13.x with Traffic Management (May 2025).
Certification Training – Cisco CCNP, Juniper, Palo Alto, Checkpoint, F5, Citrix, ZScaler – In progress. Employment History
Wolverines Transport (Remote, TX) – Network and Application Firewall Engineer – 11/2024 to Present.
Assisted the organization with the administration and management of its global F5 BigIP LTM & GTM, Citrix NetScaler ADC (SDX, MPX, VPX and ADM) and AVI NSX load balancing, as well as its network firewall (Cisco ASA, Juniper SRX, Palo Alto, and Checkpoint) infrastructure. Doug T Truong
***********@*****.***
Sachse, Texas 75048
2
Staged LTM VIPs and WideIPs in preparation for NetScaler migration to F5 BigIP. Migrated 100-plus local and global virtual servers hosted on the Citrix NetScaler ADC’s to the F5 BigIP LTM and GTM appliances.
Assisted migration teams to transition load balancer configurations from NetScaler to F5 Big-IP.
Converted NetScaler configurations into equivalent Big-IP objects, including: Virtual Servers Virtual Servers
Service Groups Pools
Services Pool Members
Responder Policies Local Traffic Policies and/or iRules Rewrite Policies Local Traffic Policies and/or iRules GSLB DNS
Health Monitors Health Monitors
Utilized NetScaler documentation to accurately replicate configurations on Big-IP.
Provisioned and installed SSL certificates to support a full proxy data flow. Assisted the organizations’ application owners with SSL certificates life-cycle management.
Target and migrated NetScaler load balancers based on a defined schedule.
Executed approved change controls for NetScaler virtual servers.
Identified and addressed configuration gaps during the migration process.
Performed preliminary verification to ensure converted configurations function as expected.
Performed weekly backup to UCS files.
Monitored load balancer virtual servers for errors and ensure post-migration stability.
Troubleshoot and remediated deficiencies, documenting all required adjustments.
Performed packet captures to isolate and resolve data flow outages.
Performed firmware upgrades to support client’s compliance to vendors’ software end-of-life and end-of-support schedules and resolve documented CVE’s.
Configured firewall and NAT rules (Checkpoint, Cisco ASA, Juniper SRX & Palo Alto firewalls) to support client- server access requests and access to public facing web portals.
Provided a migration plan from an appliance-based F5 BigIP infrastructure to a vCMP architecture.
Configured LTM policies to optimize application flows and reduced operational cost.
Configured APM policies to support access to applications using OpenID Connect authentication rules.
Implemented GSLB solutions to client’s public-facing web portals and SLB solutions for internal web portals.
Configured F5 profiles, monitors, VIP’s, pools, pool members. The Judge Group – MunichRE (Remote, TX) – Network Security Engineer and Administrator – AVI NSX and Citrix NetScaler ADC – 10/2023 to 10/024.
Assisted one of Judge Group’s clients, MunichRE, with the administration and management of its global Citrix ADC NetScaler and AVI load balancing infrastructure.
Assisted the organizations’ application owners with SSL certificates life-cycle management.
Assisted the client’s internal teams with remediating application flow issues.
Performed packet captures to isolate and resolve data flow outages.
Performed firmware upgrades to support client’s compliance to vendors’ software end-of-life and end-of-support schedules and resolved documented CVE’s.
Provided third-level escalation NOC support for all data flow outages. TEKsystems, Inc. – Alorica (Remote, TX) – Sr. Network Security Engineer and Administrator – F5 BigIP and Citrix NetScaler ADC – 02/2021 to 09/2023.
Assisted one of TEKsystems’ clients, Alorica Inc., with the administration and management of its F5 BigIP LTM and Citrix ADC NetScaler load balancer infrastructure.
Configured and troubleshooting the F5 LTM and APM and provided level 2 support.
Assisted the organization’s application owners with SSL certificates life-cycle management.
Assisted the team with remediating security vulnerabilities on applications configured on both F5 and NetScaler load balancers across multiple data centers.
Assisted client’s application team with troubleshooting application flows (Layer 1 - Layer 7).
Performed file system management to ensure client’s load balancers are fully operational and optimized.
Performed MACD implementation under ITIL change management processes in adherence to client’s policies.
Performed firmware code upgrades on both F5 BigIP and Citrix NetScaler application delivery controllers (ADC) to remediate CVE’s that have been published by the vendors. Doug T Truong
***********@*****.***
Sachse, Texas 75048
3
American Cyber Systems, Inc. (Irving, TX) – Citrix ADC Sr. Network Security Engineer and Administrator – Verizon Communications – 02/2020 to 02/2021.
Installed software code - NetScaler NS12.1: Build 55.18.nc - as part of Verizon’s standardization to its global Citrix NetScaler load balancing infrastructure.
Assisted in the physical migration of NetScaler load balancers to new core switches at multiple data centers.
Performed software upgrades on the Citrix NetScaler infrastructure to address and mitigate security vulnerabilities.
Performed hardware upgrades on the ADC platforms to address and mitigate end-of-life and end-of-support issues on the Citrix NetScaler load balancers.
Performed audit to assist Verizon’s initiative to decommission load balancing virtual servers and their corresponding content switching virtual servers and related content switching policies.
Assisted Verizon’s application owners with SSL certificates management.
Performed MACD implementation under ITIL change management processes in adherence to client’s policies. Sirius XM Connected Vehicles (Irving, TX) – Network Engineering Consultant – 07/2018 to 12/2019.
Designed and built F5 LTM virtual servers to support client’s initiative to migrate its load balancing infrastructure from Brocade to BigIP local traffic managers.
Performed related network changes to ensure the data and health check rules are permitted for communications.
Assigned and managed the IP addressing scheme on the VIP build.
Performed DNS registration on virtual servers as part of the MACD change process.
Designed, built, and presented network change requests as part of the client’s ITL and PCI compliance processes.
Assisted in the turn up of a new call center at layer 1-4 of the OSI including configuring Cisco ASR’s for WAN connectivity.
Assisted client with data center operations, administration, maintenance and support.
Assisted client migrating its Cisco ASA firewalls to Palo Alto firewalls and ensured firewall rules were transferred successfully between the two appliances.
Assisted security architecture team implementing Palo Alto features, among which were app-ID and user ID rules.
Created automated script to perform daily configuration backups of SxM’s firewalls.
Participated in DR fail-over testing – performed routing changes, DNS changes, adding missing firewall rules. Bank of America (Richardson, TX) – AVP, Consultant II F5 BigIP. Technology Engineering & Operations, Systems Security Engineering & Administration – 08/2016 to 06/2018.
Managed multiple related and interdependent projects to collectively deliver a desired business outcome based on varying degrees of complexity.
Managed and contributed to a portfolio of network infrastructure projects from design, build, through implementation and operational turn-over, with varying levels of complexity.
Performed design validation testing and pre-work in non-production environments when necessary to ensure successful implementation in production.
Created, modified, and represented appropriate change records required prior to implementing or hand-off.
Provided on-call support for any application issues related to the LTM and GTM platforms. Performed packet captures to assist application owners in troubleshooting any application errors.
Built LTMs and GTMs, both physical and virtual, from the ground up based on a set of pre-generated configuration variables.
Built VIPs and WideIPs based on a set of criteria provided by the application teams.
Performed code upgrades on LTMs and GTMs to address any hotfix issues identified by the vendor. Verizon Enterprise Solutions (DFW, TX) – Sr. Network Implementation Engineer – 11/2015 to 07/2016.
Provided Tier II execution of network changes on internal and customer facing network (routing and switching) infrastructure and application (firewall and load balancer) devices.
Executed of network changes on the change calendar in CRM system and provide pre- and post-verification of all networking changes.
Built virtual firewalls, and configured ACLs on single-context and multi-context ASA 5585 platforms. Performed IOS upgrades to resolve any bug fixes identified by the vendor.
Provided on-call support for any access issues related to filtering rules. Performed packet captures to assist in the troubleshooting of application and network issues related to the firewall operating systems.
Performed hardware and software upgrades for networking devices to comply with PCI bylaws - Upgraded Nexus 7K. Upgraded Citrix NetScaler load balancers OS from 9.3 to 10.5 code. Terremark (Irving, TX) – Sr. Network Implementation Engineer – 05/2012 to 10/2015. Doug T Truong
***********@*****.***
Sachse, Texas 75048
4
Provided Tier II administration and execution of network changes on internal and customer facing network (routing and switching) infrastructure and application (firewall and load balancer) devices.
Executed of network changes on the change calendar in CRM system and provide pre- and post-verification of all networking changes.
Reviewed requirements with change requestor and customer, if necessary, to ensure desired outcome is met on the first attempt.
Developed, implemented and maintained DR strategies for load balancer, firewall, switch and optical solutions.
Established performance benchmarks for deployed load balancer, firewall, switch and optical solutions.
Performed hardware and software upgrades for networking devices - Upgraded 100-plus pairs of ASA 5585 from code version 8.2X to 9.0.3 in order to support clustering technology.
Upgraded 10 pairs of Nexus 7K 1Gig line cards to 10Gigs as well as upgraded Sup1 to Sup2E. Upgraded Citrix NetScaler load balancers OS from 9.2 to 10.x code.
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