Cristian Manzanares

Working as a Network Security Engineer, Network Infrastructure Design, and Build., Hands-on experience in deploying, designing, and performing network segmentation, configuring, and supporting monitoring tools such as Nagios, Zabbix, and PRTG., Hands-on experience with VoIP and call centre on Asterisk PBX (Issabel, SBC), call centre inbound and outbound call reports, statistics, system setup, system maintenance, Issabel IP PBX on public cloud, Ubiquiti switches, and Cisco wireless access points., Cisco Catalyst, Nexus, Arista vEOS, Aruba HP switches, and PowerEdge (R730xd, R740xd NVMe, R740xd) servers, IOS-XR, NCS5500, ASR9K, CRS, and IOS-XE based platforms., VMware ESXi versions 6.x, 7.x, and 8.x, as well as vCenter administration; Aruba switches; MikroTik routers; Juniper (vSRX-NG, vSRX3.0, Apstra, vMX, VRR); Linux solutions including Ubuntu Server, CentOS, and Linux Bash scripting; LAMP setup; automation with Ansible, JSON, Python Netmiko, and Paramiko., Cloning data centres, such as mirrors and RAID 1-0 setups., Windows Server experience with DNS, AD, and IIS., Working with FortiGate 60E and 200E firewalls to secure the company network, enhance security, and identify vulnerabilities on the network., Managing hundreds of firewalls (Palo Alto, Panorama), making necessary changes as per customer requirements., Creating lab scenarios using Velocity infrastructure to test new software codes and configurations, as well as to reproduce customer issues in case escalation with higher resources is needed., Tested security incident response playbooks to verify best practices in issue identification and solution delivery., Investigated operational issues and identified root causes to maintain infrastructure protection.

Monitored network traffic for suspicious activity, employing advanced tools for real-time threat detection., Used Splunk to connect events and logs for improved security data analysis., Implemented encryption protocols for sensitive data transmission, significantly improving data privacy., Managed firewall configurations to protect network perimeters, without compromising system functionality., Monitored AWS and cloud platform security, ensuring appropriate encryption for optimised data protection., Ensured security best practices were implemented and adhered to, maintaining high-performing security frameworks., Worked in the Voice and Switching team as a Tier 3 Engineer in installation, testing, implementation, design, and maintenance of enterprise Cisco Attendant Console, Cisco CUCM, Cisco Unity, Jabber, as well as Webex., Configure, deploy, and operate Cisco wired and wireless devices, and debug alarms, Syslog, SNMP traps, and Wireshark., Investigated and resolved network outages, and performed traffic analysis., Worked in the Routing and Switching team as a Level 2 Engineer, assisting with cases related to routing protocols, switching protocols, STP, EIGRP, OSPF, BGP, ACL, NAT, VLAN, VTP, LACP, HSRP, SNMP, and Nexus OS., Managed and escalated support tickets to higher resources to ensure minimal network downtimes., In coordination with team members in India and New York, offering technical support and resolving issues in a timely manner, responding to calls and emails, and keeping track of records on technical issues., Documented support interactions for future reference, provided exceptional support by consistently meeting service level agreements and performance metrics.