John Oliver A. Lim

Network Engineer at Knowledge Computers
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Contact Information
us****@****om
(386) 825-5501
Location
Singapore, Singapore, SG

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Credentials

  • Microsoft Certified: Azure Fundamentals
    Microsoft
    Jul, 2023
    - Nov, 2024
  • Certified in Cybersecurity (CC)
    (ISC)²
    Jun, 2023
    - Nov, 2024
  • Cisco Certified Network Professional Enterprise (CCNP Enterprise)
    Cisco
    Aug, 2016
    - Nov, 2024
  • Cisco Certified Network Professional Security (CCNP Security)
    Cisco
    Dec, 2022
    - Nov, 2024

Experience

  • Knowledge Computers
    • Canada
    • Computer Networking Products
    • 1 - 100 Employee
    • Network Engineer
      • Apr 2023 - Present

      ▪ Update Cisco router firmware version ▪ Add Cisco router license ▪ Modify Cisco router maximum IPsec bandwidth throughput ▪ Stage and burn-in network devices ▪ Replace Cisco 7606 router daughter card ▪ Rack and Stack Cisco Catalyst 8300, Cisco Catalyst 8200 Edge Series Platforms, Cisco Catalyst 9300, and Cisco Catalyst 9200L ▪ Unmount Cisco 2901, Cisco 2900 ISR, Cisco Catalyst 3850, and Cisco Catalyst 2960 from the rack ▪ Support client's tech refresh project by assisting in stack and rack of new network equipment ▪ Replace faulty PSU and HDD of Dell EMC VNX-VSS100 storage server ▪ Prepare configurations for Cisco IOS hardening of switches based on CIS level 1 & 2 benchmark ▪ Prepare Windows Server 2022 hardening based on CIS level 2 benchmark v 2.0.0 (defense in depth) ▪ Post AD migration support (Onedrive, Applications, Shared drives) for client's domain migration project ▪ Pre AD migration support (User's credential validation) for client's domain migration project ▪ Reset the password of the admin user on a Firepower 7030 ▪ Test calls on client's IP Phones (Avaya) ▪ LTE configuration and troubleshooting on Cisco ISR 4321 ▪ Network cable management ▪ Prepare and setup 2 servers with same specs for Verge IO ▪ Manage Verge IO for VMware backup, VMware migration, Hyper-V migration, multitenancy Show less

  • RAH TECH PTE LTD
    • Singapore
    • IT Services and IT Consulting
    • 1 - 100 Employee
    • Information Technology Solutions Engineer
      • Oct 2022 - Apr 2023

      ▪ Setup/configure Aruba switches and Ruckus wireless access points. ▪ Configure NAT and firewall policies in Fortigate. ▪ Setup/configure remote access VPN in Fortigate with 2FA using Fortitoken. ▪ Setup/configure L2 and L3 Cisco Switches (VLAN, AAA, TRUNK, NTP, SNMP, INTERVLAN, ACCESS, ACL, SSH). ▪ Setup Dell server (ME5024) for VMware ESXi (VM migration from Xenserver to VMware ESXi) ▪ VM migration from Citrix to VMware. ▪ Creation of a backup job schedule from Veeam ▪ VM backup and restoration using Veeam solution ▪ Configure RAID 6 on DELL servers. ▪ Migration of virtual machines to another host via Vmotion ▪ Vsphere HA and VMware clustering creation ▪ Adding RAM and HDD of Dell Servers ▪ Manage Microsoft Azure Active Directory, Azure Portal, and Microsoft Endpoint Management ▪ Manage and create Windows update policy via Microsoft Endpoint Management ▪ Adding an E3 license to a user account in Microsoft 365 admin center ▪ Create a user account via Microsoft 365 admin center ▪ Check mail delivery status using message trace in the Exchange admin center ▪ Set permission to allow sharing of outlook calendar to an external domain in the Exchange admin center ▪ Adding and removing VM for backup in backup failure alert from Microsoft 365 admin center ▪ Delete duplicate and overdue snapshots of VM in Azure portal ▪ Configure Dell EMC Powerswitch S3124 (VLAN, Port channel,Trunk, Access, SSH) ▪ Setup Ruckus ICX switch ▪ Setup Ruckus wireless access point (R750) with standalone firmware and then join Ruckus Cloud (Cloud Controller) ▪ Setup Ruckus wireless access point (R750) with unleashed firmware for local wireless controller mode. ▪ Setup FortiAP with Fortigate and create SSID with 802.1x authentication using NPS as RADIUS server. ▪ Setup FortiAP with Fortigate and create Guest SSID with Captive portal ▪ Setup FortiAP with Fortigate and create Mobile SSID with PSK authentication Show less

  • Fujitsu Taiwan Technologies Inc., Ltd
    • Neihu District, Taipei City, Taiwan
    • Information Technology Administrator
      • May 2020 - Sep 2022

      ▪ Manage production network and firewall rules (Cisco ISR4200, Cisco Catalyst 9300L, Cisco Catalyst 2960, Cisco ASA 5516) ▪ Implemented 802.1x for LAN and WLAN to improve network security. ▪ Manage Active Directory (user account, mail and security group), DNS, DHCP server ▪ Implemented remote VPN access using Cisco Anyconnect Client with Duo for 2FA ▪ Monitor logs and network performance (Cac, Jira Insight) ▪ Monitor and manage backup system of employees laptop and production servers (UrBackup) ▪ Monitor and manage IT ticketing system for employees requests (Jira Service Desk) ▪ Monitor and manage AV Server (Trend Micro Officescan) ▪ Manage Virtual Machines through Vcenter Show less

  • Addecco Staffing
    • United States
    • Financial Services
    • 200 - 300 Employee
    • Inventory Specialist
      • Jan 2018 - Nov 2018

      ▪ Perform inventory and asset management, conference room preventative maintenance, and e-recycling ▪ Ensure audio and visual quality, troubleshooting any issues that may arise and any requests from meeting attendees ▪ Deploy and recover laptop and desktop images ▪ Perform customer support from IT accessory to workstation installation ▪ Use ticketing systems to report individual work accomplishments and to track Service Level Agreements (SLAs) ▪ Utilize Inventory Data management software to maintain inventory accuracy and workflow Show less

  • Cefinity Corporation
    • Taipei City, Taiwan
    • Junior Network Engineer
      • Jan 2017 - Sep 2017

      ▪ Installation and Troubleshooting of IP Phone systems. Unified Communication Systems of various vendors. (Huawei and Mocet) ▪ Analyzing traffic data to optimize application performance and bandwidth utilization depending on clients need and maximize end-user productivity. ▪ Monitoring the performance of applications, databases, servers, and networks as well as the end-user experience. Use policy-based selection of network paths to prioritize critical apps over other traffic with Cefinity SD-WAN solution. ▪ Using Huawei USG Firewall to setup security policies, vrrp, ipsec and vrf configurations for network security and high availability. Show less

  • Pointman Placement Specialist Inc.
    • Caloocan City, National Capital Region, Philippines
    • Project Engineer
      • Jun 2015 - May 2016

      Deployed at Smart IP Backbone Engineering Team ▪ IP provisioning and management ▪ Responsible for the configuration of IP routing and IP NAT using F5 Networks ( IP translation of Sun Network and routing between Smart and Sun Network) ▪ Responsible for change of configuration for Cisco / Huawei Routers ▪ Support and supervision of Network Equipment Installation ( ODF, Patch Panel, Open Bay Rack, Fiber Guide, Cisco Nexus Routers, Module insertion, UTP and FOC cable testing and termination, SFP Insertion) ▪ Responsible for Fortinet Firewall and routing policy definition ▪ Responsible for implementing route filter and security using ACL (Standard and Extended) ▪ Responsible for routing configuration of RNC/BSC roll outs to other network elements with different VRFs ▪ Responsible for the monitoring of traffic utilization via Solarwinds Show less

Education

  • FEU Institute of Technology
    Bachelor of Science, Computer Engineering
    2010 - 2015

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