Senior Network Engineer - Security & Automation

Marcus Duncan

Wetumpka, AL ***** 334-***-**** ************@*****.***

WEBSITES, PORTFOLIOS, PROFILES

linkedin.com/in/MarcusDuncan

PROFESSIONAL SUMMARY

Professional with strong background in network engineering, bringing practical experience and ability to deliver impactful solutions. Skilled in configuring, managing, and optimizing network systems with focus on security and efficiency. Known for fostering team collaboration and adaptability to meet changing demands. Reliable and results-driven with keen understanding of network protocols, troubleshooting, and infrastructure design.

SKILLS

Networking: Cisco ASR 1006-X, ASR9K, ASR1K, 3750X, 9300/9500 switches, Juniper MX480, IOS-XE, NX-OS, Flexible NetFlow

Protocols: OSPF, BGP, MPLS, VPN, ACLs, DHCP, RSPT, NAT, SNMP, TACACS

Tools: SolarWinds, Wireshark, NetQos, TCPDump, Cacti, Visio, SecureCRT, Remedy, ServiceNow

Operations: Network Monitoring, Troubleshooting, Cutover Support, EOLM, SIPR/NIPR, DISA coordination

Documentation: Master Station Logs (MSL), In-Effect Reports (IERs), ASI scheduling

Network Security: Access Control Lists (ACLs), 802.1x network access control, port security, Security Technical Implementation Guide (STIGs), AAA, RADIUS/TACACS+

EXPERIENCE

NETWORK ENGINEER 07/2024 to CURRENT

Heptagon Information Technology Montgomery, AL

Configured and maintained network hardware to ensure optimal performance.

Monitored network traffic and identified potential security threats.

Managed and modernized AFNET/SIPRNet infrastructure for the 26NOS team by hardening routers and switches, executing IOS upgrades, and performing End-of-Life Mitigation (EOLM).

Coordinated 150+ weekly Authorized Service Interruptions (ASIs) across NIPR/SIPR, ensuring mission assurance and conflict-free scheduling for five service branches.

Bolstered network security by implementing ACLs and site-to-site VPNs, while developing automation scripts to improve operational efficiency and reduce manual errors.

Delivered rapid troubleshooting and incident response for 495 AFNET circuits, coordinating directly with DISA to resolve outages and minimize operational downtime.

Monitored network performance and circuit utilization with SolarWinds, Cacti, and NetQos to support major infrastructure projects, including AFINC and JRSS.

NETWORK ENGINEER, I-HIT BITI RECAP 08/2023 to 07/2024

Heptagon Information Technology Montgomery, AL

Configured and maintained network hardware including routers, switches, and monitoring firewalls.

Led critical LAN infrastructure upgrades for USAF and Air National Guard bases, overseeing the project from initial site survey to final deployment.

Installed and configured Cisco Catalyst 9000 series switches, decommissioning legacy hardware while verifying all site cabling and power requirements.

Developed comprehensive site survey reports (SSRs) to guide procurement and created detailed As-Built network diagrams using Microsoft Visio.

Hardened all network devices using the latest STIGs and performed government witness testing to ensure full compliance with technical requirements (TRD).

Used SharePoint and Teams to coordinate project milestones, manage technical documentation, and ensure timely deployments with engineering teams.

NETWORK ENGINEER 09/2020 to 08/2023

Heptagon Information Technology Montgomery, AL.

Monitored network health using diagnostic tools to ensure optimal uptime.

Provided daily support for the 26NOS team by monitoring network infrastructure, performing IOS upgrades, and hardening routers, switches, and load balancers.

Resolved network outages and misconfigurations using a ticket-based system, applying expert troubleshooting and escalating complex issues to minimize downtime.

Executed End-of-Life Mitigation (EOLM) for Air Force, Army, and Air National Guard systems, managing lab validation, hardware decommissioning, and cut-over support.

Developed and modified automation scripts to streamline network tasks, reduce manual errors, and improve overall operational efficiency.

Documented all incidents and change requests to create a detailed knowledge base for auditing and to eliminate rework on future tasks.

EDUCATION

Network Technician Diploma Network Technician 12/2018

Virginia College, Montgomery, AL

CERTIFICATIONS

Cisco Certified Network Associate (CCNA)

CompTIA Security+

Active Secret Security Clearance

PERSONAL INFORMATION

Title: Network Engineer Network Administrator

Availability: Open to Remote Work

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