Sunil Kumar

St Albans,Hertfordshire

Summary

Detail-oriented Network Engineer with 3 years of experience and strong background in network technologies and security. Accomplished network developer with proven success in designing and implementing business technology solutions. Focused on maintaining network security to provide customers with safe data management.
Strong hands-on background in routing & switching (TCP/IP, VLANs, OSPF, BGP).
Effective communicator with strong analytical, time-management, and project leadership skills, comfortable working across multi-vendor and cross-functional environment.
Experienced in network upgrade and migration projects end-to-end with minimal downtime and clear stakeholder communication.
Adept at network monitoring & troubleshooting using SolarWinds and packet analysis with Wireshark to minimize downtime through efficient fault isolation
· Validated expertise through CCNA andNetwork+ across routing, switching, and automation.

years of professional experience

years of post-secondary education

Certification

CSL GROUP

Watford, Hertfordshire

2022.08 - Current

Network Engineer with 3 years of experience designing and optimizing LAN/WAN infrastructures for high performance
and reliability.
Diagnosed and resolved complex tier-2/3 network connectivity issues, managing enterprise-grade routing, switching, and security infrastructure on Cisco Nexus and Juniper platforms to ensure high network availability.
Worked with Cisco and Juniper devices (Cisco Catalyst WD C2960 switches, ISR routers, Juniper EX/SRX) to deploy and troubleshoot access, distribution, and WAN edge layers.
Experience implementing, troubleshooting and maintaining Network, Security, and Wireless devices.
Network Engineer with 3 years of experience designing and optimizing LAN/WAN infrastructures for high performanceand reliability.
Conducted Wi-Fi surveys using Ekahau software to assess network coverage and performance.
Maintained documentation and rack elevation diagrams in Confluence; updated asset records in NetBox to ensure accurate network inventory.
Installed, provisioned, and optimized enterprise server hardware (HP ProLiant, Cisco UCS blades), managing routine hardware maintenance and troubleshooting to minimize downtime.
Installed hardware components to enhance functionality and reliability of network infrastructure.
Validated expertise through CCNA and Network+ across routing, switching.

CSL Group

Watford, Hertfordshire

2022.08 - 2023.03

Provided 1st, 2nd, and 3rd line support, resolving tickets
completing projects using Remedyforce and Jira.
Diagnosed and resolved system performance issues by upgrading hardware components, including RAM and SSDs. Provided application support for core business platforms such as Citrix and Microsoft 365, ensuring optimal performance and user experience.
Enrolled and provisioned devices using
Microsoft Intune with Windows Autopilot, leveraging hardware hash files to automatically register devices and enable zero-touch deployment. Ensured devices were correctly associated with organisational profiles for seamless configuration, policy application, and user-ready setup upon first sign-in.Ticketing Systems (e.g.,
Jira – add if used)
Configured DHCP, DNS, Routers, Firewalls and Switches
including VLANs using CLI and GUI for segregated LAN and WAN connectivity (Draytek,
Cisco).

AAA Technologies Limited

Reading, Royal Berkshire

2022.06 - 2022.08

Installation and configuration of Cisco Catalyst 9200/9300
Performed IOS upgrades and managed configuration backups to ensure system reliability.
Supported LAN and WAN systems, ensuring continuous connectivity and optimal functionality.
Coordination with field engineers for deployment and upgrades.
Installed, configured, and troubleshot Multi-Function Devices (MFDs) and network printers to enhance operational efficiency.

Borunemouth University

Bournemouth, England

2020.01 - 2022.04

Routing & Switching: TCP/IP, IPv4/IPv6, VLANs, OSPF, BGP, STP, EtherChannel, LAN/WAN Design, ALC
Network Monitoring & Analysis: SolarWinds NPM, Wireshark
Routers: Cisco C897VA K9, Cisco 2801, Cisco 2921/K9, Cisco, 2801, Cisco 2951/K9

Switches: Nexus 9500 Series (9504, 9508, 9516), Cisco Catalytic c2960, Cisco c9300-48p, Cisco WS C2960x 24ps L
Network Management: Putty, MobaXterm, VMware, Ekahau