Abdulmujeeb Umar
Senior Network and Security Admin/ Sytems Administrator
Surulere,Lagos
Summary
Results-driven Network & Security Administrator with 7 years of experience in managing IT infrastructure, network systems, and cybersecurity solutions across diverse environments. Proven expertise in administering enterprise systems (SAP, AMS, SharePoint), configuring LAN/WAN/VPN infrastructures, and implementing robust IT security measures. Skilled in network monitoring, firewall management, and technical troubleshooting, with a strong ability to coordinate with external service providers and support audits. Adept at delivering 1st, 2nd, and 3rd-level support while ensuring seamless IT operations and compliance with technical standards.
Overview
7
7
years of professional experience
1
1
Certificate
Skills
- Skilled in TCP/IP and WAN Enterprise technologies
- Routing and Switching
- Network Operations
- Linux and Unix
- Routine Inspections and Performance testing
- Remote technical support
- Technical infrastructure migration
- Technical troubleshooting
- Microwave Radio Support and Optimization
- Firewalls and endpoint security
- Network debugging
- VXLAN designs and troubleshooting
Accomplishments
- Routers: Mikrotik(All series), Cisco 2600, 2900, ASR1000, ISR4331, Ubiquiti EdgeRouter(All models).
- Switches: Cisco 2900, 3500,3750, 4500,6500 series, MikroTik CRS series, Netgear M4300, M4350, Ubiquiti EdgeSwitch,UniFi Switch.
- Firewalls: Sophos XG, Fortinet 60E, 100E, 500E, PaloAlto 5k.
- OLTs: UFiber(All Models), Huwaei MA5600T.
- Routing Protocols: Inter-VLAN, RIP, EIGRP, OSPF, BGP.
- Switching Protocols: VLAN, ARP, VTP, STP, MSTP, HSRP, GLBP, Port-Channels, Port Security, Port Mirroring.
- Security: NAT/PAT, Ingress & Egress Firewall Design, VPN (IPsec, GRE), ACL’s.
- Infrastructure services: DNS, DHCP, ICMP, SYSLOG, SNMP, NTP, TFTP, AAA, TACAS, RADIUS, SSH.
- Networking Tools: Wireshark, MobaXterm, Putty, GNS3, Cisco Packet Tracer, VMware, Service -Now, Lucid Chart.
- Monitoring Tools: PRTG, SolarWinds, UISP, Network Weathermaps.
Work History
Network and Security Administrator
OLAM Nigeria(Mindsprint)
Lagos
01.2023 - Current
- Managed firewall deployment, rules migrations, troubleshooting and administration.
- Worked with teams to develop company-wide information assurance, security standards and procedures.
- Authored security and vulnerability reports, detailing logged incursions and suggesting remediation efforts.
- Developed and maintained company-wide endpoint security solutions.
- Managed company Bring Your Own Device program, onboarding employee devices and verifying absence of inherent security threats.
- Installed and configured network printers and other peripheral devices.
- Diagnosed and resolved hardware and software issues.
- Resolved issues and escalated problems with knowledgeable support and quality service.
Consultancy - Senior Network Consultant
Ascomnet
FCT, Abuja
02.2022 - Current
- Provided complete end-to-end engineering and installation of route-based IP network solutions.
- Provided network support services for devices such as hubs, bridges, routers, and other hardware.
- Managed, tracked, and coordinated problem resolution and escalation processes.
- Troubleshot complex multi-vendor network service provider issues.
- Performed troubleshooting for Juniper, Cisco, Huawei and MikroTik devices.
- Created VPN infrastructure and allowed for secure remote connections.
- Assisted with implementation and support of network monitoring tools.
Network Operations Manager
Dotmac Technologies LTD
FCT Abuja
02.2021 - 12.2022
- Managed Network Operating Center (NOC) technical infrastructure and server performance.
- Held change management meetings to inform impacted staff of forthcoming network downtimes and alterations.
- Drafted network configuration backup process policies to support disaster recovery.
- Provided network debugging and troubleshooting services in response to user-reported faults and malfunctions.
- Engineered and established LAN/WAN communications in Classified Network Management Environments.
- Configured and maintain operational status of over 500 Cisco, MikroTik, Ubiquiti Routers, and Switches with a multitude of routing protocols to include MPLS, OSPF, BGP, EIGRP, and HSRP for Layer 3 switches.
- Administered and implemented installation of wide-area Layer 2 connectivity via Point-to-Point, Frame-Relay, HDLC, Channelized T-1, ISDN, IPSEC VPN tunnels with Sophos Firewalls to provide routing, SSL VPN, firewall, bandwidth management, encryption, authentication, and data integrity for secure connectivity across managed IP networks and the Internet.
- Collaborated with vendors to identify best options for optimizing network performance.
- Performed virtual machine provisioning and VM priority setup.
- Provided detailed network diagrams and procedural guidelines.
Technical Support Officer
Dotmac Technologies LTD
FCT Abuja
03.2019 - 01.2021
- Analyzed and developed service goals for in-bound call center.
- Tracked KPIs and created continuous improvement plans.
- Developed and implemented training initiatives for new hires.
- Increased customer satisfaction ratings by 75%.
- Managed customer contact center with 5 support representatives.
- Rolled out software updates and applied server patches to thwart threats from penetrating networks.
- Worked with software development team on reported errors and bugs on newly released software and assisted in deployment of release fixes.
- Actively listened to customers' requests, confirming full understanding before addressing concerns.
- Introduced NMS infrastructure and management tools to create and manage virtual server computing environment.
- Performed day-to-day LAN and WAN administration, maintenance and support.
- Escalated emergency technical issues beyond knowledge to maintain optimum up-time.
Network Operations Center Engineer
Dotmac Technologies
FCT Abuja
04.2018 - 02.2019
- Monitored and maintained network and software components according to established guidelines and best practices.
- Supported global network users with connectivity, VPN, and access issues.
- Configured IP assignment, core network configuration, and DNS setup for new users.
- Coordinated with technical support, service provisioning and sales teams to deliver network services at or above SLA requirements.
- Delivered tier-3 support for co-location, customer backup networks, and ISP services.
- Troubleshot routers, layer 2 and 3 switches, and network firewalls.
- Deployed, managed and optimized microwave radios of 2.4Ghz, 5Ghz and LTU technology.
Education
Bachelor's Degree - Computer Science
National Open University
Nigeria10.2024
National Diploma - Computer Science
Kaduna Polytechnic
Kaduna State01.2017
Timeline
Network and Security Administrator
OLAM Nigeria(Mindsprint)
01.2023 - Current
Consultancy - Senior Network Consultant
Ascomnet
02.2022 - Current
Network Operations Manager
Dotmac Technologies LTD
02.2021 - 12.2022
Technical Support Officer
Dotmac Technologies LTD
03.2019 - 01.2021
Network Operations Center Engineer
Dotmac Technologies
04.2018 - 02.2019
Bachelor's Degree - Computer Science
National Open University
National Diploma - Computer Science
Kaduna Polytechnic
Certification
- CompTIA Network+ N10-008
Languages
English
Native language
Hausa
Proficient
C2
Date of Birth
26th December
Federal Government Project Affiliations
Was very involved in projects with the below listed Federal Government Agencies;
- United Nations Educational, Scientific and Cultural Organization(UNESCO)
- Nigerian Communications Satellite(NIGCOMSAT)
- National Health Insurance Scheme(NHIS)
- Standard Organization of Nigeria(SON)
- National Emergency Management Agency(NEMA)
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