General skills

I
am a good listener.
am analytical.
like to solve a variety of puzzles and problems.
like to work in a team, but can also work alone.
speak 4 languages (Dutch, German, English and basic French).
have 20 years of experience in administering and securing computer networks.
obtained very strong skills in routing, switching, network security, troubleshooting skills and analytics.

Platform knowledge

Routers: Cisco ASR1000 series, ASR9000 series, CSR1000V, C800 and C900 series, C3845, C7200 series, C7609, ISR4000 series, Huawei AR160 series, Mikrotik Routerboard and many more..
Switches: Cisco UCS, Cisco Catalyst, Nexus en Meraki, HP Procurve and Aruba, Arista 7280, Huawei CloudEngine 5800 Series and many more.
Firewalls: SonicWALL, TUNIX, Cisco PIX, ASA (multi context), Meraki en Firepower, IPTables, Palo Alto, Juniper SRX and SSG, Fortigate
(Reverse) proxies and loadbalancers: Cisco WSA, F5 BIG IP
NAC: Cisco ISE
2FA / MFA systems: Onespan, Cisco ASA (also with MS Azure), FortiGate
Also: WTI Console servers, Arbor PeakFlow anti-DDOS systems, HP Unified 870 Wireless Controller, Wireless Access Points (WAPs), Huawei Wireless controller and WAPs
Operating systems: Cisco IOS-XR, IOS-XE en IOS, all Windows OS, DOS, all Window Server OS from NT4 up to Server 2025, MacOS 6 up to X, several UNIX and LINUX OS distributions, Apple IOS, Android.
Windows functions: Domain Controller, Certificate Authority, AD, DHCP, DNS, IAS, NPS and Exchange server
Virtualisation: VMWare ESXI and Microsoft Hyper-V, GNS3
Automation: Ansible
Monitoring: PRTG, Solarwinds Orion, Zabbix, LibreNMS
Tools: Putty, SecureCRT, ASDM, Wireshark, Notepad++, KeePass, MS Visio, MS Office up to Office365
Backup: VEEAM, Dantz Retrospect, DOS scripts
Databases: MariaDB, MySQL and SQL

Techniques and protocols

TCP/IP and the OSI model
L1 - Physical: Single mode and multi mode fiber, CWDM, DWDM. Copper lines, ATM, ADSL, VDSL, BVDSL, WiFi, WLAN, 4G LTE, 5G..
L2 – Data Link: Ethernet (framing & MAC), VLAN, PVLAN, Trunking (802.1Q), MLAG, vPC, EtherChannel, Port-Channel, LACP, LLDP, PPP, VRRP, HSRP, GLBP
L3 – Network: IPv4, IPv6, NAT, PAT, VRF, MPLS, GRE, IP-VPN, DMVPN, SD-WAN, RIP, OSPF, EIGRP, BGP, VRRP, HSRP, GLBP
L4 – Transport: TCP. UDP, QoS, Load balancing
L5 – Session: PPP, PPPoE, VoIP (call signaling), Remote Access VPN, LAN-to-LAN VPN
L6 – Presentation: SSL, IPSec (encryption), Certificates, PKI
L7 – Application: OpenDNS, DHCP, DNS, NTP, SNMP, AAA, RADIUS, VoIP (applications), SSL VPN, Application Firewall, Web Application Firewall (WAF),
Intrusion Prevention (IPS), gateway antivirus, URL content filter, personal firewall, antispam, antivirus, antimalware, antispyware software, Cisco Umbrella.

Certifications

- CSSA
- CCNA Route Switch
- CCNP Route Switch Tshoot
- CCNA Security