Network/Security Administrator - Centurion

Datafin; Gauteng; On-site; ZAR 300 000 - 450 000; Full time

Job summary

A leading software company in South Africa is seeking a motivated Network / Security Administrator with 2–4 years of experience. The role requires expertise in configuring enterprise networks, maintaining security protocols, and collaborating with teams. Ideal candidates will possess a CCNA certification and strong skills in firewall administration and network monitoring tools. This position offers opportunities for continual learning in cybersecurity.

Qualifications

• 2–4 years of hands-on experience in network administration.
• Adept in configuring and maintaining enterprise networks.
• Experience in responding to security incidents compliant with best practices.

Responsibilities

• Configure and troubleshoot Cisco routers and switches.
• Maintain network security with ACLs and firewall rules.
• Monitor network traffic to detect anomalies.
• Collaborate with security teams for audits and compliance.

Skills

Cisco routing and switching

Firewall administration

Network Access Control

VPN setup

Network monitoring tools

Basic scripting

Education

Cisco Certified Network Associate (CCNA)

CompTIA Security+

Cisco Certified CyberOps Associate

Tools

SolarWinds

Nagios

Wireshark

Nessus

Splunk

Graylog

ELK stack

Job description

Overview

A Software Company with a focus on digital transformation is seeking a motivated and detail-oriented Network / Security Administrator with over 2–4 years of hands‑on experience in configuring, maintaining, and securing enterprise networks.

CCNA with proven expertise in LAN / WAN infrastructure, firewall policies, VPN deployment, and network monitoring.

Adept at identifying vulnerabilities, optimizing network performance, and responding to incidents in compliance with best practices and organizational policies.

Duties

Configure and troubleshoot Cisco routers and switches in enterprise environments.

Maintain network security through access control lists (ACLs), firewall rules, and intrusion prevention systems.

Manage VPN access for remote users and branch offices.

Monitor network traffic and performance to detect anomalies or malicious activity.

Implement routine security patches and firmware updates on network devices.

Collaborate with security teams to support audits and compliance checks.

Respond to and document Tier 1 and Tier 2 security incidents.

Maintain up‑to‑date network diagrams and documentation.

Requirements

Technical Skills

Networking :

Cisco routing and switching (IOS configuration, EIGRP, OSPF, VLANs, STP)

Security :

Firewall administration (Cisco ASA, Palo Alto, Fortinet); VPN setup (IPSec, SSL); IDS / IPS; Network Access Control

• Network Access Control (NAC)

Tools :

Network monitoring (SolarWinds, Nagios, Wireshark); Vulnerability scanning (Nessus); SIEM tools (Splunk, Graylog, ELK stack)

Systems :

Windows Server, Active Directory; Linux

Administrative :

ITIL / Ticketing systems (e.g., ServiceNow); Basic scripting (Python, Bash)

Certifications :

Cisco Certified Network Associate (CCNA)

(Optional) CompTIA Security+

(Optional) Cisco Certified CyberOps Associate

Technical Environment

Cisco Catalyst and ISR series

Cisco ASA or Firepower

Windows Server, Active Directory

Linux for monitoring / security tools

Syslog servers, SIEM tools (Splunk, Graylog, or ELK stack)

Attributes

Strong analytical and troubleshooting skills

Effective communicator with cross‑functional teams

Process‑oriented with an eye for documentation

Continual learner with a strong interest in cybersecurity