LG Energy Solution Ochang Factory 1 Replacement of old network equipmentProject implementation period: 2024.02 ~ presentProject Role: Engineer- The FA network has completed replacing 14 Catalyst4500 equipment with C9500-48Y4C- The OA network has completed replacing 18 Catalyst4500 equipment with C9500-48Y4C- Completed replacement of 32 C9200 switchesLGCNS network equipment replacementProject implementation period: 2023.04 ~ 2023.06Project Role: Engineer- Completed replacement of 157 C9200 switches- Completed replacement of 22 C9300 switches- Completed replacement of 2 C9407R switchesLG Chem Japanese subsidiary IPSEC VPN constructionProject implementation period: 2023.03 ~ 2023.03 (5 days)Project Role: EngineerConfigure IPSEC VPN between headquarters and Japan - Configure IPSEC VPN between headquarters and Japan - Configured as a PPPOE environment for Japanese workplacesToss Credit Data Network Construction ProjectProject implementation period: 2022.07 ~ 2022.12Project Role: Engineer - New installation of Nexus 9000 switches (approximately 50 units) - Nexus devices use the VPC protocol. - New installation of C9300 switches (10 units)

IBK Pension Insurance network and security equipment operation tasks - Drawing up the entire network and security configuration diagram - Create a detailed configuration diagram for each network - Allow and block firewall policies through Fortigate Firewall - Abnormal traffic analysis through fortianalyzer - External organization VPN configuration through NexG equipment - Allowing firewall policy through Future Firewall and SMC and linking VPN with external institutions - Hardware IPSEC VPN configuration for each user for home work - Operation of Samsung Officeserv7500 Exchange - In -house phone book management - Create Port Map for each network device - F5 L4 switch SLB configuration - IP management through Tcosecuip solution - Perform Secuwiz SSL VPN operation and firmware work

Busan LCT Hotel New Network EstablishmentProject implementation period: 2020.01 ~ 2020.02 Project Role: Engineer - Installed C9200 switches (approximately 70 units) - Installing C9300 switches (2 units) - C9407R backbone switch installation (2 units)Lotte Department Store aging network replacement projectProject implementation period: 2019.05 ~ 2019.07 Project Role: Engineer - Replaced 14 C3560 switches with C9300 switchesLDCC SIEM platform server infrastructure construction projectProject implementation period: 2019.04 ~ 2019.06Project Role: Engineer - About 30 Cisco UCS C220-M5, C240-M5 servers built directly - Configure Raid according to the purpose of each server - Server firmware update and BIOS tuningEstablishment of AOS operation infrastructure for Insurance Development InstituteProject implementation period: 2018.09 ~ 2019.02Project Role: Security PL and Network Engineer - Writing a proposal for AOS operation infrastructure construction (Network, Security) - New DR center IP design and configuration drawing - Established 2 ISR4451 internet dedicated routers - Established 2 C4507R+E backbone switches - Established 8 C9200 L2 switches - After analyzing the VPN configuration of the main center's SECUI firewall and NexG firewall, the DR center's VPN configuration and NAT operation - Redundancy between main center and DR center through F5 GSLB constructionLOTTE HOTEL Old Network Replacement ProjectProject implementation period: 2018.09 ~ 2018.11, 2019.09 ~ 2019.11Project Role: PM and Engineer - Replaced C2960 switches with C9200 (approximately 130 units) - Replace C6509 switches with C9407 switches (4 pieces) - 2 units of ASA-5516X and configuration of IPSEC VPN with overseas branchesLotte World Old Network Replacement ProjectProject implementation period: 2018.04 ~ 2018.7 Project Role: PL and Engineer - Replaced C2960 switches with C9200 (approximately 150 units) - Replace C6509 switch with C9410 switch (2 units)

KT Skylife network maintenance work - Perform SLB and FWLB operations through Alteon L4 switch - Perform Cisco L2, L3, Router tasks - Perform IPSec VPN interworking with each branch - Measures after diagnosing security vulnerabilities by equipment - NAT and ACL settings through Cisco ASA firewall

Korea East-West Power network equipment operation - Korea East-West Power headquarters and branch backbone switch and L2 switch operation - Creating a new configuration diagram for each network (business network, wireless network, voice network, CCTV network) - Creation of IP management ledger for efficient IP management - Vulnerability diagnosis and measures for network equipment - Carrying out improvement work for network optimization - Establishment of new VDI backbone for Ulsan Power Plant

KT signal network maintenance- Solved problems caused by L2, L3 failure handling and OS bugs- Replacement work after RMA for hardware failure- Cleanup to avoid failure of Cisco 7613 router- Mobile communication network 3G gateway equipment maintenance

Korea Southern Power network and voice facility operation tasks performed - Cisco switch and router configuration tasks and log analysis - Operation of Avaya Exchange and Cisco Exchange - Korea Southern Power phone book management and line management - Network and voice troubleshooting - IP management through Genian NAC solution operation - Korea Southern Power Headquarters relocated from Samseong-dong, Seoul to Busan