SK SAMIM

• Managed and supported banking data center network infrastructure including routers, switches, and SD-WAN devices.
• Performed traffic engineering, failover testing, and DC-DR drills to ensure business continuity.
• Provided end-to-end network troubleshooting from data center to bank branches and ATM networks.
• Implemented traffic load balancing between application and database servers across branch connectivity.
• Configured network connectivity for new bank branches and ATM locations.
• Managed Euronet traffic routing and failover connectivity between bank networks and RBI infrastructure.
• Supported CBS and Non-CBS banking application connectivity, ensuring minimal downtime during business hours.
• Managed WAN routers, core routers, VPN routers, internet routers, and NAT partner routers for financial transaction traffic.
• Administered core, distribution, and access layer switches within banking data center architecture.
• Worked with Cisco ISR routers, Catalyst 9000 series switches, HP networking devices, and Cisco Nexus 5K/7K switches.
• Troubleshot application network connectivity hosted behind Cisco ACI fabric.
• Managed APIC controllers and multiple EPG configurations within ACI environment.
• Coordinated with vendors and service providers to resolve critical banking network issues.

• Managed enterprise customer networks based on 3-tier and 2-tier architecture.
• Configured and supported Cisco Catalyst 9300, 9400, and 9500 switches.
• Administered ISR and ASR routers for enterprise WAN connectivity.
• Implemented and maintained LAN/WAN routing using BGP and OSPF protocols.
• Supported data center spine-leaf architecture using Nexus 5K and 7K switches.
• Managed Nexus 2K fabric extenders for extended data center connectivity.
• Performed IOS upgrades on routers, Catalyst switches, and Nexus switches.
• Managed Meraki SD-WAN infrastructure across distributed store networks.
• Supported Meraki MX450 (Data Center), MX68 and MX95 appliances at branch sites.
• Coordinated with ISPs and telecom providers for WAN connectivity troubleshooting.
• Ensured reliable branch-to-data-center connectivity and network performance optimization.

• Provided L3 TAC support for multiple global enterprise customers across LAN/WAN environments.
• Managed P1 and P2 incident bridge calls, performing live troubleshooting and root cause analysis.
• Implemented and deployed routers, switches, and SD-WAN solutions in enterprise networks.
• Troubleshot Cisco routers, Catalyst switches, Cisco SD-WAN, Aruba switches, and Nokia SD-WAN environments.
• Managed MPLS, DMVPN, L2 circuits, and Internet connectivity across global networks.
• Performed IOS upgrades, configuration changes, and infrastructure deployment activities.
• Troubleshot routing protocols including BGP and OSPF.
• Worked in VXLAN and EVPN environments within Nexus and SD-WAN architectures.
• Prepared Method of Procedure (MOP) documents and validated network changes.
• Utilized Remedy and ServiceNow ticketing tools for incident and change management.

· Provided Level 3 support for enterprise routing and switching, resolving Sev 1 network issues.

· Configured BGP/OSPF, route-maps, prefix list and ACLs on Cisco ASR 1000 and ISR 4000 routers.

Cisco Viptela (vManage, vSmart, vBond, vEdge/cEdge),

Technical Experience: Cisco SD-WAN Components & Technologies

· vEdge

· vSmart

· vManage

· vBond

· Zero Touch Provisioning (ZTP)

· Overlay Management Protocol (OMP)

· BFD

· SD-WAN Fabric

· VPNs (VRFs)

· Templates

• Managed enterprise customer network incidents and service requests through ticketing systems.
• Provided troubleshooting support for Cisco routers, switches, and SD-WAN environments.
• Performed MPLS PE-CE and PE-PE connectivity troubleshooting and latency analysis.
• Supported WebVPN configurations and remote access connectivity.
• Ensured SLA compliance and escalated major incidents to appropriate teams.
• Participated in major incident bridge calls with L1/L2 teams for rapid issue resolution.

• Troubleshot Cisco routers (7200VXR, ASR1002) and Catalyst switches (2950, 2960).
• Configured DHCP services and resolved IP addressing conflicts.
• Coordinated with ISPs for leased line installation and troubleshooting.
• Diagnosed network connectivity issues using ping, traceroute, and packet analysis.
• Managed DNS (BIND9), Apache web services, and email services in Linux environment.

• Supported network monitoring and troubleshooting for leased line networks.
• Monitored bandwidth utilization and device health using MRTG monitoring tools.
• Assisted in troubleshooting router and switch connectivity issues.
• Supported senior engineers in network maintenance and incident resolution.