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arpan3a/README.md

Hi, I'm Arpan 👋

CCNA-certified Network & Infrastructure Specialist with 4 years of experience in enterprise infrastructure monitoring, technical implementation, customer support, and network troubleshooting.

I build hands-on Cisco Packet Tracer and VMware labs covering enterprise routing and switching, network security, wireless networking, and Windows Server infrastructure. My projects include architecture diagrams, sanitized configurations, troubleshooting notes, security policies, and verification evidence.

Certifications

Current Focus

  • Currently learning: Advanced Cisco ASA policy, Windows/Linux security telemetry, and Python/Netmiko automation
  • Seeking: Network technician, NOC Analyst, Network Administrator, or Junior Network Engineer opportunities in Ontario, Canada

Core Technical Skills

Networking & Security

  • Routing and Switching: IPv4 addressing, VLSM, VLANs, 802.1Q trunking, SVIs, router-on-a-stick, STP, PortFast, BPDU Guard, LACP EtherChannel, HSRP, static/default routing, and single-area and multi-area OSPF
  • Network Security: Cisco ASA, security zones and levels, DMZ segmentation, standard and extended ACLs, NAT/PAT, DHCP relay, SSH v2 hardening, stateful inspection, and permitted/denied traffic validation
  • Monitoring and Enterprise Platforms: FortiAnalyzer, Cisco ISE, Cisco DNA, Aruba Central, ClearPass, PRTG, and LibreNMS
  • Voice and Wireless: Cisco CME, dial peers, cross-site VoIP, Cisco WLC 3504, lightweight APs, FlexConnect local switching, WLAN-to-VLAN mapping, WPA2-PSK/AES, 2.4/5 GHz RF, and DOCSIS 3.0/3.1 diagnostics

Systems, Active Directory & Virtualization

  • Windows Server and Active Directory: Windows Server 2016/2022, AD DS, Organizational Units, security groups, Group Policy, security auditing, AD-integrated DNS, and authorized DHCP scopes
  • Virtualization and Endpoints: VMware Workstation Pro, Linux CLI, Windows and macOS Layer 1–4 diagnostics, commercial workstations, and server hardware troubleshooting
  • Service Delivery: ServiceNow, Salesforce, ITIL incident/change management, Microsoft Visio, technical implementation, customer support, and structured L1–L3 troubleshooting

Featured Projects

1. NLH Healthcare: 4-Site Enterprise WAN & DMZ Security Architecture

Designed a multi-area OSPF enterprise WAN connecting four hospital sites, Toronto HQ, Vancouver, Calgary, and Brampton—across 31 devices.

Implemented HSRP redundancy, VLAN segmentation, LACP EtherChannel, centralized DHCP relay, DMZ segmentation, SSH hardening, cross-site VoIP, and seven documented troubleshooting scenarios.

Topics: CCNA Cisco Packet Tracer OSPF HSRP EtherChannel DHCP DMZ VoIP Troubleshooting

View project


2. Cisco ASA 5506-X Firewall & DMZ Security Lab

Built and troubleshot a three-zone perimeter firewall using trusted INSIDE, partially trusted DMZ, and untrusted OUTSIDE networks.

Implemented OSPF, static default routing, dynamic PAT, centralized DHCP relay, restricted SSH administration, ICMP inspection, and a least-privilege DMZ ACL. Verified both permitted traffic and denied DMZ/outside-initiated connections.

Topics: Cisco ASA Firewall DMZ ACLs OSPF PAT DHCP Relay SSH Network Security

View project


3. Windows Server 2022 & Ubuntu Linux Home Lab

Deployed and verified a Windows Server 2022 Primary Domain Controller in VMware Workstation Pro using PowerShell and Server Manager.

Implemented AD DS, custom Organizational Units, security groups, AD-integrated DNS, DHCP, Group Policy, logon auditing, and Windows Security Event Log verification. Extended the environment with Ubuntu Linux and host firewall practice.

Topics: Windows Server 2022 Active Directory Group Policy DNS DHCP VMware PowerShell Ubuntu Security Auditing

View project


4. Cisco WLC, FlexConnect & Wireless VLAN Segmentation Lab

Designed a controller-based wireless network using a Cisco 3504 WLC, four lightweight access points, FlexConnect local switching, WPA2-PSK/AES, and separate WLANs for IT, HR, Finance, and Management.

Integrated 802.1Q trunks, router-on-a-stick, centralized DHCP relay, and management VLAN 50. Verified WLAN segmentation, client addressing, WLC management, and inter-VLAN connectivity.

Topics: Cisco WLC FlexConnect WLAN WPA2 VLANs 802.1Q DHCP Relay Router-on-a-Stick

View project


Additional Labs

My repositories also include focused labs covering centralized PAT, OSPF default-route propagation, multi-area OSPF, centralized DHCP, and structured network troubleshooting.

View all repositories

Connect with Me

Pinned Loading

  1. ccna-4site-healthcare-wan ccna-4site-healthcare-wan Public

    Multi-area OSPF enterprise WAN connecting 4 hospital sites (Vancouver, Calgary, Brampton, Toronto) with HSRP redundancy, DHCP, SSH security, and cross-site VoIP - built in Cisco Packet Tracer for C…

    1

  2. windows-server-2022-ad-lab windows-server-2022-ad-lab Public

    Enterprise Windows Server 2022 Active Directory (AD DS), Group Policy (GPO), DNS & DHCP Lab built on VMware Workstation Pro with Event ID 4624 security auditing.

    1

  3. ccna-wlc-flexconnect-vlan-lab ccna-wlc-flexconnect-vlan-lab Public

    CCNA wireless lab featuring Cisco WLC, FlexConnect, WPA2 WLANs, VLAN segmentation, and DHCP relay.

    1

  4. ASA-firewall-security-lab ASA-firewall-security-lab Public

    Cisco Packet Tracer lab demonstrating ASA security zones, OSPF, static routing, PAT, DHCP relay, SSH, ICMP inspection, and DMZ traffic policy.

    1