SecureCRT
MARCUS D. GREENFIELD
Capitol Heights
Summary
Well experienced Network Specialist focused on maximizing successful Upkeep & functionality of daily/weekly operations through effective use of technical troubleshooting abilities. Top-notch engineer with excellent time management and customer service skills. Known for reliability and adaptability, with swift capacity to learn and apply new skills. Committed to leveraging these qualities to drive team success and contribute to organizational growth.
Overview
11
11
years of professional experience
1
1
Certification
Work History
Network Operations Specialist
Leidos (Headquarters Marine Corp – Navy)
05.2023 - Current
- Support the Navy Marine Corps Headquarters (HQMC) Classified & unclassified networks at the Pentagon
- Submit Port activations, MAC Address whitelisting, VLAN Changes & MAC increase requests for verified clients through JSP
- Utilize Fluke devices to test network ports & gather information such as switch name, VLAN, port numbers & to verify if network connection is active
- Add, remove & edit configurations for USMC network switches dealing with authentication, security & authorization
- Manage/Monitor USMC network switches via SecureCRT & TACACS+ in the National Capitol Region. Servicing over 5,000 users total
- Train & Supervise both Junior level Network engineers & Tier 2 technicians
- Troubleshoot all network related concepts including Physical layer, Switch layer & routing layer issues.
Systems Engineer
ConsultNet, LLC (Xcelocloud MVP Support)
01.2023 - 04.2023
- Utilized Azure Virtual Desktop for communicating with team members & clients
- All client requests & troubleshooting needs are addressed through Azure Virtual Desktop
- Monitored different logs captured from clients and diagnose the logs for possible errors & alerts
- Received tickets request based off my top skill-sets, which are Troubleshooting, Monitor/Maintenance & Data Entry.
Systems Engineer
MicroAutomation (Pentagon Force Protection Agency - PFPA)
09.2022 - 12.2022
- Supported both the Pentagon Operations Center & Secondary Operations Centers telephony system (OMNI911)
- Monitored multiple Virtual Machines, Servers & Logs daily to ensure the best upkeep for the computer systems
- Located vulnerabilities & CAT findings through STIGS viewer
- Updated Excel workbooks with information on Software updates & network status
- Ran security updates on computers & servers by running scripts as an administrator
- Built databases by utilizing the Virtual Box software for Windows.
Client Support Technician
Delaware Nation Industries (Department of Defense – DCAA)
07.2020 - 09.2022
- IT Specialist for the Client Tech division stationed at DCAA Headquarters
- Responsible for troubleshooting and resolving users issues related to desktop software, Hardware, Printers (local & network), telephones & other IT related equipment
- Successfully managed imaging new Dell laptops for each refresh project assigned to me
- Configured Firewall settings through Windows Security & Windows Defender Firewall on Windows 10 devices
- Installed/Uninstalled computer hardware & software applications upon ticketed customer requests
- Performed BIOS/Firmware updates, General Policy updates & Antivirus Updates to the specific machines in need
- Utilized remote desktop applications (Dameware & RDP) to complete actions that require administrative rights
- Located CAT I, II & III findings for computers using the STIG Viewer tool in order to identify vulnerabilities
- Performed data transfers for existing clients by either running a Backup tool script or manually retrieved data from the users hard drive.
OIT Service Desk Deskside Engineer
Insight Global (U.S. Securities and Exchange Commission.)
06.2017 - 07.2020
- Acted as backup IMAC Lead (Install, Move, Add & Change) whenever active Lead was absent
- Responsible for troubleshooting issues with the use of desktop software, hardware, printers, telephones and other IT related equipment whether it be independently or with other engineers from multiple teams
- Managed work queue for surpluses, EPPS (Exit Process Protocol) & outstanding off boarding tickets for IMAC (Install, Move, Add & Change) division to ensure that no ticket reached SLA breach
- Performed IPv4 Windows 7 & 10 images through PXE Boot for desktops & laptops assigned to interns, new hires & existing clients
- Performed moves, disconnects & reconnects for client's computer workstations
- Retrieved & verified assets from exiting contractors/employees and made sure that they were returned to inventory for proper asset management
- Resolved issues from tickets that have been created & escalated by Tier 1 technicians.
Client Service Support for Division of Information Technology
Insight Global (Federal Deposit Insurance Corporation.)
09.2016 - 05.2017
- Deployed and installed workstations for newly hired and existing clients in their workspace
- Moved workstations & computer peripherals from one workspace to another
- Reimaged Dell laptops and desktops
- Lead the role of asset management for the client services refresh technician team
- Updated asset tags & service tickets in the Service Now ticketing system that supports approximately 2,500 clients users & more
- Offered desk side support & asset management at multiple FDIC campus locations.
Bloomberg BNA Publishing Support Specialist
Ettain Group (Bloomberg BNA)
05.2015 - 10.2015
- Assisted callers with publishing stories and articles on the BNA website
- Provided user assistance with unlocking files, moving files from one location to another & other support needs
- Completed approximately 5 - 10 web tickets per day via phone, email and through web tickets known as Jira tickets.
UMUC Tier 1 Help Desk representative
Randstad Technologies (UMUC)
06.2014 - 04.2015
- Provided students and faculty members with quality assistance dealing with technical issues in their online classes and UMUC accounts
- Completed an estimate of 15 case tickets or more a day
- Assisted students and faculty members via email with case issues such as logging in to accounts, having access to certain portals and other technical related issues.
Education
Business AdministrationInformation Technology
Prince George's Community College
Largo, MD01.2016
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Year Up National Capital Region, Partner of Northern Virginia Community College
01.2012
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Suitland High School
Forestville, MD01.2011
Skills
- Expert in Network Operations
- Expert in Information Technology
- Expert in Client Services
- Adaptability and Flexibility
- Problem-solving abilities
- Attention to Detail
- Multitasking abilities
- Written Communication
- Excellent & effective Communication
- Teamwork and Collaboration
- Self Motivation
- Reliability
- Professionalism
- Technical communication
- Proficient in Routing & Switching
- Proficient in Windows OS
- Proficient in MAC iOS
- Proficient in Microsoft Office Suites
- Hardware & Software installations
Certification
- CompTIA Cloud+ Certification, 04/2025
- CompTIA Secure Cloud Professional, 04/2025
- CompTIA Cloud Admin Professional, 04/2025
- Cisco CCNA Certification, 05/2021
- CompTIA Security+ ce Certification, 11/2020
- CompTIA Network+ ce Certification, 08/2019
- Microsoft Office Specialist Certification, 09/2018
Software
Service Now
Windows PowerShell
Linux
Cisco Software
TACACS
VMware
PuTTY
Active Directory
Microsoft Office Suite
Windows Servers
Cherwell
Clearance
Active Secret Clearance
Languages
English
Native or Bilingual
Spanish
Professional Working
Timeline
Network Operations Specialist
Leidos (Headquarters Marine Corp – Navy)
05.2023 - Current
Systems Engineer
ConsultNet, LLC (Xcelocloud MVP Support)
01.2023 - 04.2023
Systems Engineer
MicroAutomation (Pentagon Force Protection Agency - PFPA)
09.2022 - 12.2022
Client Support Technician
Delaware Nation Industries (Department of Defense – DCAA)
07.2020 - 09.2022
OIT Service Desk Deskside Engineer
Insight Global (U.S. Securities and Exchange Commission.)
06.2017 - 07.2020
Client Service Support for Division of Information Technology
Insight Global (Federal Deposit Insurance Corporation.)
09.2016 - 05.2017
Bloomberg BNA Publishing Support Specialist
Ettain Group (Bloomberg BNA)
05.2015 - 10.2015
UMUC Tier 1 Help Desk representative
Randstad Technologies (UMUC)
06.2014 - 04.2015
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Year Up National Capital Region, Partner of Northern Virginia Community College
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Suitland High School
Business AdministrationInformation Technology
Prince George's Community College
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