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Cloud Engineer

Network Engineer

• Configure and maintain network infrastructure which includes three data centers consisting of Cisco Nexus 9K's, 7K's, 5K's and 3K fabric extenders, ISR 4300 series routers, wireless LAN controllers and Cisco ASA firewalls.
• Configure and maintain dozens of remote branch sites which include multiple MPLS and DMVPN connections and hundreds of Cisco routers and switches.
• Design, implement and maintain a complex routing infrastructure containing multiple WAN links utilizing BGP, EIGRP and policy-based routing to provide failover and redundancy in case of link failure.
• Deploy and maintain a wireless infrastructure consisting of 802.1x authentication and authorization, five Cisco wireless LAN controllers and a CVO (Cisco Virtual Office) controller.
• Manage over 15 Cisco ASA firewalls, including NAT and access rules utilizing numerous contexts.
• Implemented and maintain ForeScout Network Access Control, including 802.1x company-wide.
• Ensure all Cisco IOS and NX-OS devices are compliant and schedule after-hours downtime to upgrade when new security vulnerabilities are released.

Network Engineer

• Lynchburg City Schools has two high schools, three middle schools, eleven elementary schools as well as five alternative schools and sites which serve more than 8,000 students. Our goal is to provide a stable network and IT infrastructure in order to assist the classroom teacher provide the best instruction for his/her students.
• Network engineering and administration - manage and maintain a network infrastructure that includes over 300 Cisco switches.
• Upgraded and improved the network from a completely flat layer 2 domain to segregated layer 3 sites utilizing EIGRP.
• Network security - manage and Cisco 5585 ASA firewall and a Lightspeed Rocket web filter in order to protect the students and provide a distraction-free classroom environment.

Sr Network Engineer / Sr Network Administrator (E-5)

• Was in charge of establishing and maintaining Combat Logistic Regiment 15's LAN, Domain Controllers, and Exchange Servers on both unclassified and classified systems.
• Established IPsec tunnels, GRE tunnels, and DMVPN tunnels to other adjacent units in order to provide reliable, secure services to hundreds of end users.
• Implemented a dual routing protocol environment utilizing EIGRP, RIP, and redistributing to provide an efficient, stable backbone network.
• Configured multiple VLANs in order to separate voice, data, and server traffic.
• Drafted and implemented a baseline LAN topology that enabled Combat Logistic Regiment 15 to vastly improve their network's reliability and allow newcomers to easily be able to pick up where his/her predecessor left off.
• Designed network IP schemes and diagrams.
• Utilized downtime to give classes to Marines, helping them become better network engineers and administrators and ultimately improving mission accomplishment.
• Managed a team of over 10 Marines, assigning different job roles and ensuring the mission was always able to be accomplished.

Sr. Network Engineer (E-5)

• Worked and troubleshot with 6 WAN sites in order to provide WAN services to our multiple Enterprise-level networks.
• Implemented, maintained, and troubleshot eBGP, iBGP, EIGRP, OSPF, and route redistribution on Cisco routers.
• Tweaked BGP in order to adapt to the mission's dynamic redundancy and scalability requirements by utilizing IP prefix lists, route maps, route reflectors, and AS-path prepending.- Configured layer 2 switch stacks (VLANs, trunking, inter-VLAN routing, VTP domains, STP, port security, and BPDU guard).
• Configured and monitored the Fortinet firewall and McAfee IDS in order to secure the network from all external threats on both Unclassified and Classified systems.
• Utilized Access Control Lists on Cisco routers in order to add an additional layer of security.
• Configured IPsec VPN tunnels utilized for secure communication between multiple sites.
• Implemented a baseline security policy for the unit's dynamic requirements utilizing policy-based packet filtering, virus and email/spam content filtering, NAT/PAT, DMZ, and DNS black hole.
• Performed packet captures in order to troubleshoot, identify potential issues or threats, and utilize risk management techniques.
• Designed and improved network infrastructure and IP schemes.
• Instructed Marines under my charge, giving over 100 hours of classes to ensure that the mission was always accomplished without error.
• Consulted with Cisco representatives in order to receive training that was readily available to military personnel.

Network Administrator / Helpdesk Technician (E-3)

• Was in charge of administering and maintaining 3 network infrastructures, each providing a different level of classification and supporting over 5,000 end users. To do this, it was necessary to take on multiple different roles, including providing 24/7 helpdesk services to all NATO forces and U.S. government personnel located in Lashkar Gah, troubleshooting network outages, and ensuring 99.99% up-time in a combat zone environment.
• Successfully opened and closed 1,000+ trouble tickets, including Active Directory account lockouts, port security lockouts, software and hardware issues, cabling issues, DHCP problems, DNS issues, IP telephony related issues, etc.
• Maintained, monitored, and troubleshot (when necessary) EIGRP, OSPF, and multiple GRE tunnels.
• Configured and installed TACLANEs (Tactical Local Area Network Encryption devices) in order to create GRE tunnels between our site and the main server hub in Camp Leatherneck.
• Configured from a blank state, tested, and installed over a dozen new Cisco routers and switches to accommodate the expanding network and increase of personnel.
• Assisted with a project in which we rewired the entire network infrastructure at Lashkar Gah, replacing the entire backbone with multi-mode fiber-optic cable and installed over 20 Cisco routers and switches into new rack cabinets.
• Logged all trouble tickets and network outages in order to recognize trends and make improvements to the network infrastructure.

Bachelor of Science (BS)

• Information Technology - Security

Certificate of Commendation, Issued by Lieutenant Colonel Mark T. Donar

• Commanding Officer, 1st Maintenance Battalion takes pleasure in commending Sergeant Mark S. Willis, United States Marine Corps, for outstanding achievement in the performance of his duties while serving as Data Chief for Headquarters and Service Company, 1st Maintenance Battalion, Combat Logistics Regiment 15, 1st Marine Logistics Group, from 28 July 2014 to 15 August 2014. Throughout this period, Sergeant Willis performed his duties in an exemplary and highly professional manner. During the conduct of 1st Marine Expeditionary Brigade's Large Scale Exercise, Sergeant Willis used his expertise and technical knowledge to troubleshoot with the higher communication element to plan, design, and establish the tactical data communication network, allowing the battalion to begin training on their arrival to the field. Sergeant Willis ensured there was a 99 percent up-time of eight servers for Internet and email access, giving the users efficient and uninterrupted services. With his guidance, his team diligently maintained 24 hours vigilance of the network ensuring the battalion's ability to communicate with higher and adjacent units without service interruptions during the course of the exercise. Sergeant Willis' professionalism, initiative, and loyal dedication to duty reflected credit upon him and were in keeping with the highest traditions of the Marine Corps and the United States Naval Service.

Letter of Appreciation, Issued by 2nd Lieutenant Yinan Yang

• 1. In recognition of your outstanding contribution and performance while serving as Deployed Security Interdiction Device (DSID) Operator, Alpha Company Forward, 9th Communication Battalion, I Marine Expeditionary Force, in support of 9th Communication Battalion Communication Exercise 3-13 from 8 September to 19 September 2013. Your dedication to duty and superior technical expertise were crucial in the detachment's ability to establish all communication services within 48 hours. Your hard work enabled the successful validation of Alpha Company Forward's ability to provide expeditious command, control, communication, and computer (C4) services in order to extend warfighting capabilities to the I Marine Expeditionary Brigade Command Element (CE).
• 2. For your dedication to the detachment's mission and the skillful execution of your duties, I sincerely thank you. You truly set an outstanding example as a young NCO of Marines. Semper Fidelis!