Mohammad Mahbubul Hasan Chowdhury

• Designed, configured, deployed, and maintained enterprise-level network security infrastructure, ensuring seamless system operation and compliance with industry standards.
• Monitored network traffic, investigated security incidents, and responded to potential security breaches, maintaining a high level of system integrity.
• Implemented network security policies and best practices, focusing on securing data, applications, and network infrastructure.
• Provided hands-on management and troubleshooting of security appliances including Palo Alto Firewalls, Cisco FTD, Juniper SRX, Fortinet Firewalls and F5(LTM/WAF/GTM/Proxy).
• Assisted in the design and deployment of VPN solutions and load balancing, ensuring robust network security architecture.
• Managed tickets, incidents, and change requests to resolve security-related issues within SLA timelines.
• Assisted in the implementation of advanced malware protection and vulnerability management processes to detect and mitigate security risks.

Wipro Technologies BD. Ltd
Company Location : Grand Delvistaa, road 113, Gulshan, Dhaka

Project Name: Managed Service Operation of Grameenphone (IT Infrastructure and Application Operation)

Duties/Responsibilities:


 Administration, Operation & Maintenance of Grameen phone Enterprise IT Data Centers (Legacy DC, DR, New DA DCs) at Savar and Bogura and AWS DC (region-Singapore).
 Manage Operation and Implementation Fortinet, Paloalto Next Generation Firewall.
 Configuration & Maintenance of Cisco Nexus 9K, 7K, 5K, 3K, 6509-E, 6506E, 3560-G Switches, Cisco 1841, 1941, 7604, 7606, ASR 9001 Routers and Cisco ACI Software driven network.
 Manage Operation and Implementation F5 BIGIP ASM and LTM
 Manage Operation and Implementation AWS Cloud network infrastructure
 Configuration of Static & Dynamic Routing Protocols OSPF, BGP during new network integration as per network solution architecture.
 Administration of F5 Proxy, DNS and Open Source BIND DNS.
 Administration of campus network Infrastructure of GPHouse- GPCHQ, for 3500 users, largest Layer 3 campus network infrastructure in Bangladesh.
 Administration, Operation & Maintenance of Grameenphone Regional Offices LAN, WLAN & WAN Network Across the country.
 Syslog integration of all network devices on SPLUNK, to make sure that logs are available to check when required.
 Quarterly VAPT scan initiation and mitigation of VAPT findings on network devices and quarterly vapt mitigation on Exposed/DMZ network & security devices.
 Automation of network device’s configuration backup using bash expect script, cronjob.
 Security Hardening of network devices as per industry best practice, following standards, benchmarks.
 Network devices OS upgradation, patching as per SOC guideline and version availability and to mitigate vulnerabilities.
 Log assessment on Firewall log analyzer, BigIQ, Syslog server during incident handling time, any types of attacks.
 Manage Operation of Cisco Stealthwatch for threat detection and accelerated threat response.
 Manage Operation of Cisco ISE for Radius and Tacacs service

Accenture Communications Infrastructure Solution (ACIS) Ltd.
GPHOUSE
Basundhara, Baridhara
Dhaka-1229

Duties/Responsibilities:

 Administration, Operation, Maintenance & Troubleshooting of Enterprise Datacenter Network for 3 Telenor Telco Business Units-Grameenphone (Bangladesh), DiGi(Malaysia), DTAC (Thailand) & Telenor Global Shared Service ( GSS) Datacenter.
 LAN, WA & WLAN network administration for total 17000 no. of enterprise users for 4 Telenor Telco organizations in ASIA.
 Network Infrastructure Critical Incident handling & troubleshooting on time with updates on various channels (Bridge call, WhatsApp channel Group update).
 Proactive monitoring & capacity analysis enabled clients for having proper disaster recovery plan, enabled quick recovery of service & reduced network incidents by 50% on last 3 years.
 Responsible for GI Node of GP Network \[IGP (OSPF, EIGRP), EGP, BGP\]
 Operations & Maintenance of GP’s external DNS servers.
 Operation & Maintenance of GP’s Enterprise Internet services via Proxy (Squid), NAT.
 Handle all NAT, FTP (vsftpd), mail servers (send mail).
 Proactive backup of all kinds of Linux servers and routers in GP, Digi, GSS and DTAC Network.
 Strong Knowledge on Routing & Switching.
 Public IP resource management.
 Internet BW optimization and BW control \[Allot AC-1000, Allot AC-1020), ET BWM- R2400-L\].
Achievements:

 Working Experience on Internet Gateway for Edge/GPRS, 3G and Enterprise Internet Systems.
 Achieved "Encore awards" by Accenture, for significant contribution on Project Nucleus Operation for the year 2016 & 2015 consecutively.
 Operation & maintenance of Enterprise Datacenter Network for 3 Telenor Telco Business Units-Grameenphone (Bangladesh), DiGi(Malaysia), DTAC (Thailand).
 Working Experience on LAN setup for Grameenphone Center, GPCF, DTAC Service Halls, Dcenter Shops, Digi Retail Store.
 Working Experience on Network setup for Grameenphone, DTAC Partner Network.
 Working Experience on Cisco Switches (3750, 3560) and Routers (7600, 7206, 1800).
 Working knowledge of SNMP(cacti, Nagios, MRTG), NFSEN protocols.
 Working experience in Vulnerability scan, Mitigation.
 Reverse Proxy server & NTLM Proxy Server.
 Finished Disaster Recovery Project in GP Network.
 Google Global cache server installation in GP Network \[Server installation, L-2 LACP, BGP\]
 Site Redundancy and Capacity upgradation of Internet Gateway Systems. \[ L-3 LACP \]

 Google Global cache server installation in GP Network \[Server installation, L-2 LACP, BGP\]
 Capacity upgradation of Internet Gateway Systems. \[ L-3 LACP \]

GPHOUSE
Basundhara, Baridhara
Dhaka-1229

Responsibility:

•Handling all Linux Servers \[HP Proliant DL 360 g-5, g-6; IBM x3650, Dell Power Edge R710\] in GP & GPIT Internal Network.
•Responsible for GI Node of GP Network \[OSPF, BGP\].
•Operations & Maintenance of GP Internet Gateway and ensure Redundancy in site & node level.
•Operations & Maintenance of GP Fixed-Broadband Gateway and ensure Redundancy in node level.
•Operations and Maintenance all Webhosting platform of GP Network (grameenphone.com,
djuice.com.bd, internet.grameenphone.com, gpit.com ) using LAMP architecture.
•Handle different Web-servers (Apache, Tomcat) for GP internal Applications.
•Operations & Maintenance of GP Primary & Secondary DNS.
•Handle all NAT, FTP (vsftpd), mail servers (sendmail).
•Proactive backup of all kinds of Linux servers and routers in GP & GPIT Office Network.
•Strong Knowledge on Scripting Language (bash).
•Strong Knowledge on Routing & Switching.
•Public IP resource management.
•Internet BW optimization and BW control \[Allot AC-1000, Allot AC-1020), ET BWM- R2400-L\].
Achievements:
•Handle Authentication of all SSO servers for GP internal network using Linux Platform.
•Working Experience on Cisco Switches (3750, 3560) and Routers (7600, 7206, 1800).
•Working knowledge of SNMP, NFSEN protocols.
•Working Knowledge of Cacti, MRTG, Nagios.
•Working Experience on Reverse Proxy server & NTLM Proxy Server.
•Finished Disaster Recovery Project in GP Network.
•Implement 2nd Internet Gateway system for GP \[Server, BW-manager installation, Router configuration\]
•Fixed Broad Band Pilot Project. \[ Squid, MRTG, IPTABLES, Router Configuration \]
•Handling bandwidth manger \[Allot, ET\].

11, Mohakhali C/A Dhaka-1212

Responsibility:

•Ensure the fault-free operation and maximum service availability of IN (Intelligent Network) via regular proactive maintenance tasks and close network monitoring.
•Perform Operation and Maintenance tasks and routines according to documented procedures and processes.