Koushik Roy
CCNA 200-301 Certified & CCNP-Trained Network Engineer
Specializing in large-scale Enterprise LAN/WAN and ISP-grade infrastructures. Skilled in Cisco ASR 9906, Cisco ACI fabric, and Nexus 9K spine-leaf architectures with strong L2/L3 expertise. Proficient in OSPF, BGP, EIGRP, ISIS, MPLS (Basics), VLANs, STP, EtherChannel, ACLs, DHCP, DNS, and NAT. Experienced in NOC operations, P1/P2 incident handling, log analysis, and SLA-driven troubleshooting. Strong in network monitoring, documentation, and MOP preparation. Focused on delivering secure, high-availability, and optimized end-to-end connectivity across mission-critical environments.
3+
Years Experience
In Network Operations
250+
Incidents Resolved
Proactive & Reactive Troubleshooting
40%
Faster Resolution
Reduced Mean Time to Resolution
99.9%
Uptime Maintained
Through Continuous Monitoring
About Me
CCNA-certified and CCNP-trained Network Engineer with 3+ years of hands-on experience in Enterprise LAN/WAN and ISP environments. Skilled in Cisco routing and switching, including Cisco ASR 9906, Nexus 9K, and ACI/APIC, Cisco 2600/3600/3700/3850/4500/9300 series routers & switches. Proficient in OSPF, EIGRP, BGP (iBGP/eBGP), VLANs, STP/RSTP/MSTP, EtherChannel, ACLs, VRRP, and MPLS fundamentals. Experienced with monitoring and troubleshooting tools such as Cisco DNAC, Cisco Prime, Netcool, SolarWinds, Wireshark, and ServiceNow. Strong ability in handling P1/P2 incidents, performing configuration changes, creating MOPs, maintaining SLAs, and ensuring secure, stable, high-availability network operations through effective coordination with L2/L3 teams and ISPs.
- Age24+
- ResidenceIndia
- Current LocationBengaluru
- Mob No.+91 8345910586
- E-Mailkoushikroy05042001@gmail.com
Core Competencies
Expertise in routing protocols, network troubleshooting, and infrastructure design
Expert implementation of OSPF, BGP, STP protocols with VLANs and inter-VLAN routing configurations.
Advanced diagnostics using Wireshark, Cisco Packet Tracer, GNS3, and EVE-NG for comprehensive network analysis.
Python scripting for network device configuration, monitoring, and automated backup solutions.
Azure cloud integration, Linux/Windows server management, and hybrid network architectures.
Resume.
Experience
Network Engineer
Teleindia Networks
October 2025 – Present
Configure, maintain, and troubleshoot Cisco routers and switches, including Cisco ASR 9906, Nexus 9K (9300/9500), and Cisco ACI fabric with APIC controllers.
Manage core Layer 2 & Layer 3 technologies: VLANs, Inter-VLAN routing, STP/RSTP/MSTP, EtherChannel, HSRP, VRRP, GLBP, and trunking.
Handle L1/L2 troubleshooting for packet loss, network slowness, latency, throughput issues, interface errors, and routing problems.
Perform configuration changes, IOS/firmware upgrades, backups/restores, and version control for production network devices.
Monitor network performance using Cisco DNAC, Cisco Prime, Netcool, MRTG, Cacti, and APIC dashboards.
Conduct daily health checks: interface/SFP status, CRC/input drops, CPU/Memory utilization, NTP, SNMP polling, syslogs, alarms, and environmental checks.
Troubleshoot routing protocols: OSPF, EIGRP, BGP (iBGP/eBGP), static routing, VRFs, MPLS L3VPN, and policy-based routing.
Implement network access and security controls such as ACLs, DHCP Snooping, Port Security, VLAN ACLs, and device-level hardening.
Provide technical guidance to field engineers and support execution of planned changes, migrations, and maintenance activities.
Participate in Severity P1/P2 bridge calls, acting as a central focal point for coordination, impact analysis, and rapid incident restoration.
Maintain detailed documentation: updated network diagrams, topology maps, port maps, inventory sheets, change logs, device backups, and RCA reports.
Collaborate closely with internal teams (L2/L3 Engineering, Security, DC teams) for escalations, configuration validation, and post-change testing.
Network Engineer
IBM
July 2022 – September 2025
Performed end-to-end troubleshooting for enterprise LAN/WAN environments ensuring minimal downtime.
Configured and supported Cisco routers & switches (2600, 3600, 3700, 9300, 3850, 4500 series).
Managed VLANs, Trunking, STP/RSTP/MSTP, VTP, EtherChannel, DHCP, NAT, and Layer 3 routing configurations.
Troubleshot OSPF, EIGRP, BGP, RIP, static routes, VRFs, and other enterprise routing architectures.
Ensured high availability by handling HSRP/VRRP incidents, redundancy validation, and performing failover testing.
Analyzed network issues using packet captures, syslogs, SNMP monitoring, and tools like Wireshark.
Implemented security controls including ACLs, prefix-lists, route-maps, AAA, IPS/IDS fundamentals, Port Security, Private VLANs.
Supported Palo Alto, FortiGate, and Cisco ASA firewalls for policy review, log analysis, and connectivity checks.
Prepared daily/weekly/monthly reports on network uptime, device health, link utilization, and incident summary.
Assisted in hardware deployments: routers, switches, access points, patch panels, and LAN expansion activities.
Maintained accurate change management documentation, topology diagrams, backup repositories, inventories, and RCA reports.
Actively participated in planned maintenance, upgrades, migrations, and implementation of new network components.
Skills
Networking Protocols
Hardware & Platforms
Network Management & Tools
Tools & Simulation
Operating Systems & Cloud
Education
Master of Computer Application (MCA)
Dr. B. C. Roy Engineering College, Durgapur
June 2021 - July 2023
CGPA: 8.18
Bachelor of Computer Application (BCA)
Michael Madhusudan Memorial College, Durgapur
June 2018 - August 2021
CGPA: 8.56
Professional Certifications
CCNA (Cisco Certified Network Associate)
Cisco | ID: CSCO14880285 | 17 March 2025
Expertise in routing & switching, subnetting, VLANs, OSPF, and BGP with hands-on Cisco Packet Tracer experience.
CCNP (Cisco Certified Network Professional) Trained
Advanced training in enterprise networking
Completed comprehensive training covering advanced routing, switching, and troubleshooting for complex enterprise networks.
Network Addressing & Troubleshooting
Cisco Networking Academy
IPv6 addressing, neighbor discovery, and comprehensive network troubleshooting.
Networking Basics
Cisco Networking Academy
TCP/IP, OSI model, network security, and practical router/switch configuration.
Currently Learning
FortiGate Firewall
Exploring next-generation firewall features, security policies, and threat prevention.
Currently Learning
Azure-700
Mastering Azure networking services for designing and implementing secure cloud and hybrid network solutions.
Featured Projects
Here are some of the projects I'm proud to have worked on.
Designed and implemented a scalable SOHO network for a new branch office of JMD Agro Foods. The solution included secure VLAN segmentation, wireless access, and automated IP addressing to support reliable inter-departmental communication for a growing food distribution company.
Engineered a comprehensive, multi-campus network for a university with a hierarchical design. Implemented VLANs, Inter-VLAN routing, RIPv2, and DHCP to ensure scalable and secure communication across all departments.
A foundational project demonstrating network segmentation for two distinct departments using subnetting. The configuration includes static IP addressing and basic routing on a Cisco router to enable secure and efficient inter-department communication.
Hands-On Labs
Practical labs demonstrating my network engineering skills.
A GNS3 project demonstrating a real-world OSPF Multi-Area network with a virtual link to connect a non-backbone area to Area 0 through a transit area.
A GNS3 lab focused on BGP path manipulation using AS-Path prepending and Local Preference to influence routing decisions and control traffic flow between autonomous systems.
This lab demonstrates how to enable MPLS in a network, how routers build LDP neighbor relationships, and how they exchange MPLS labels to forward packets based on labels.
Contact.
Current Location
Bengaluru
Mobile No.
+91 8345910586
koushikroy05042001@gmail.com