Choose your next skill.

• Explain how switching, routing and the OSI model relate.
• Work out an IPv4 subnet and distinguish DNS from DHCP.

Try it yourself: Draw a home or small-office network and trace how a device gets an address and looks up a website.

• Distinguish cloud service models and shared responsibility.
• Explain the roles of EC2, S3, VPC, Route 53 and Lambda.

Try it yourself: Sketch a VPC, subnet and EC2 instance, then explain the route and access controls needed for internet connectivity. A drawing needs no cloud account.

• Describe Azure resource organisation and role-based access.
• Connect administrator tools, device management and security monitoring.

Try it yourself: Draw a resource hierarchy and explain where you would grant a reader role without granting administrator access.

• Compare routing protocols and explain OSPF and HSRP roles.
• Combine VLAN, STP, DHCP, ACL and NAT checks in a network lab.

Try it yourself: Sketch a small routed network, predict its forwarding path, then describe how you would verify a gateway failover in your own lab.

• Explain confidentiality, integrity, availability and authorised testing.
• Relate ATT&CK techniques to logs, alert triage and incident escalation.

Try it yourself: Write an alert-triage checklist: what happened, which evidence supports it and when you would escalate. Use sample data in a lab.

• Navigate a Linux shell and explain virtual-machine networking.
• Describe an Ansible playbook and the stages of a CI/CD pipeline.

Try it yourself: In a local lab, inspect a directory and a file, then sketch a change moving through build, test and release gates.

• Explain security zones, policy matching, routing and NAT as separate decisions.
• Describe how logs and Panorama support firewall operations.

Try it yourself: Draw a LAN-to-internet traffic path and record the route, policy and NAT checks you would make before changing a rule.