Gazi Muhammad Abdullah Mahfuz is a highly skilled Network Management Officer and IT infrastructure specialist, with years of hands-on experience in designing, securing, and managing enterprise-level network systems across leading organizations in Bangladesh. Currently serving at Islami Bank Bangladesh PLC, he plays a pivotal role in maintaining secure WAN/VPN connectivity, ensuring data integrity, and optimizing network performance across hundreds of branches nationwide. His deep understanding of Cisco technologies, VLAN management, and firewall configurations makes him an ideal instructor for anyone aspiring to master Cisco CCNA and advanced networking fundamentals.

Professional Experience

Network Management Officer at Islami Bank Bangladesh PLC
At one of the country’s largest financial institutions, Mahfuz is responsible for maintaining a highly secure and resilient banking network infrastructure. He manages WAN/VPN connectivity between HQ and branches, implements dual-uplink systems for ATMs, and enforces network compliance and security standards. With expertise in Cisco, MikroTik, and enterprise-grade monitoring tools such as Zabbix and SolarWinds, he ensures 24/7 operational continuity. His role also extends to troubleshooting complex network issues and coordinating endpoint and server support with IT teams.

Former System Engineer (IT) at Square Informatix Ltd
During his tenure at Square, Mahfuz was responsible for designing and implementing Windows-based large-scale network architectures and data center operations. He worked on system administration, gap and risk assessments, and infrastructure upgrades, ensuring system stability and compliance with organizational standards. His contributions in high availability (HA) systems and disaster recovery (DR) strengthened the company’s core IT backbone.

Former Network Engineer at Spectrum Engineering Consortium Ltd
Mahfuz began his career working on one of Bangladesh’s major government projects—the National Board of Revenue (NBR) Network Implementation Project. His responsibilities included LAN/WAN design, data center setup, and Cisco network device configuration for Dhaka Customs and other branches. He played a key role in deploying secure, high-availability infrastructure, setting the foundation for his advanced expertise in enterprise networking.

Technical Skills

Networking: Cisco Switching & Routing · VLANs · OSPF · BGP · Firewall Management · VPN Configuration · Network Security · QoS
IT Infrastructure: Data Center · Disaster Recovery · LAN/WAN Architecture · Virtualization · Network Compliance
Simulation & Tools: Cisco Packet Tracer · GNS3 · SolarWinds · Zabbix · MikroTik · Nmap
Programming: C · C++ · HTML · CSS
Operating Systems: Windows Server · Linux

Projects & Research

Implementation of Tier-3 Data Center for NBR – Designed and deployed secure network infrastructure ensuring high availability and redundancy.
High Availability (HA) Infrastructure at Square Pharmaceuticals – Built virtualization-based failover architecture to improve uptime and performance.
Data Center Protection & Fault Tolerance Analysis – Academic research on ensuring continuous network operation and minimizing downtime.
LAN Migration and DR Setup for NBR & Border Checkpoints – Implemented secure network backbone for critical national operations.

Now, as an instructor for Complete Cisco CCNA: Zero to Mastery, Gazi Muhammad Abdullah Mahfuz brings a wealth of real-world experience from the banking, telecom, and enterprise IT sectors. His deep practical knowledge, combined with a structured teaching approach, helps learners not only understand Cisco networking concepts but also apply them confidently in real-world environments.