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Network Administrator skills: what to learn first, and what can wait

Network interviews rarely stay on theory for long. Somebody pulls up a switch config or a packet capture and asks what you'd check first. Learn the skills below in order and your study time goes where hiring managers actually probe.

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Step one

Gets you the interview

Subnetting in your headScreeners still hand you an address and a mask and ask for the usable range. If you reach for a calculator, the call gets shorter. Practise until splitting one block into smaller subnets takes seconds.

VLANs, trunks and access portsMost tickets you'll inherit are a port in the wrong VLAN or a trunk missing an allowed VLAN. Be ready to explain the difference out loud and show the commands you'd use to confirm it.

DHCP and DNS troubleshootingWhen a user says the internet is down, it's often a lease that never came back or a record pointing somewhere stale. Walking through ipconfig, nslookup and the scope on the server tells a manager you won't escalate everything.

Cisco IOS command line basicsEven shops that run Meraki or Aruba want proof you can read show running-config, show interfaces and show mac address-table without a web dashboard holding your hand.

Step two

Gets you the offer

Firewall rules and NAT on a real platformPalo Alto, FortiGate or Cisco ASA, pick whichever the posting names. Interviewers like to ask why a new server can't reach the internet, and the answer is usually a missing NAT rule or a policy sitting below a broader deny.

Reading a packet capture in WiresharkFiltering a capture down to one conversation and spotting a failed TCP handshake or a retransmit storm is the moment you stop sounding junior. Bring one story where a capture proved the network innocent.

Wireless surveys and controller setupDead spots in the warehouse and roaming drops on handheld scanners are constant complaints. Knowing channel planning, SSID design and how to tune a controller answers a question most candidates dodge.

Running a clean change windowHiring managers want to hear your rollback plan before they hear your change. Describe the backup config you saved, the ping you left running and the point where you'd have backed out.

Step three

Gets you promoted

Dynamic routing with OSPF and BGPStatic routes carry a single office. Once there's a second site, a carrier handoff or a cloud VPN, someone has to own routing, and that person is usually next in line for the engineer title.

Network access control with RADIUSSetting up NPS or Cisco ISE so a laptop only lands on the right VLAN after it authenticates is security work that auditors ask about. It puts you in meetings you weren't invited to before.

Scripting and config automationA Python script with Netmiko, or an Ansible playbook that pushes the same change to every switch, saves you a weekend. It also shows you can scale the team's work, which is what the next title is judged on.

Cloud networking in AWS or AzureVPCs, security groups and site-to-site tunnels into the cloud keep landing on the network team's desk. Learn how they map to what you already run on premises and you'll be the obvious owner.

Certificates worth your time

Certificate	Best for	Effort	Worth it?
CompTIA Network+	Help desk techs trying to get past a resume filter for their first network role	A few weekends of study if you already work in IT	Worth it early, especially for government or contractor roles that list it by name. It won't impress a network team on its own, so treat it as a door opener.
Cisco CCNA	Anyone who wants the administrator title and a clear path toward engineering	A couple of months of steady evening study with a lab	The one to get if you only get one. Hiring managers read it as proof you understand routing and switching rather than just a vendor's web dashboard.
Cisco CCNP Enterprise	Administrators aiming for a network engineer or senior role	Many months of study across a core exam and a concentration exam	Overkill for your first admin job. Once you own routing and a few sites, it's the credential that backs up a request for the engineer title.

Exam outlines, prices and renewal rules change, so check the current details on the CompTIA or Cisco site before you book anything.

Put it on your resume like this

Weak

Responsible for maintaining the company network and troubleshooting connectivity issues.

Strong

Managed 40 Cisco switches and 3 FortiGate firewalls across 5 sites; cut Wi-Fi tickets 35% after a wireless survey and channel redesign.

Questions people ask

Which network administrator skill should I learn first?

Subnetting and VLANs. Nearly every screening call and lab test starts there, and they're the base for everything else, from firewall rules to routing. Once you can subnet quickly and explain a trunk port, move on to DHCP and DNS.

Do I need to know Linux as a network administrator?

You need enough to be comfortable. Monitoring tools, syslog servers and a lot of network appliances run on Linux, so you'll want to move around the shell, read a log file and use tools like tcpdump and dig. You don't need to be a sysadmin.

Is scripting really necessary for network admins?

Not to get hired, but it's the clearest way to stand apart once you're in. Start small: a Python script that backs up every switch config each night. That one task teaches you most of what you'll use.

How do I practise without access to real equipment?

Cisco Packet Tracer is free and covers most CCNA topics. EVE-NG lets you run real router and firewall images. Build a small office design with two VLANs, a firewall and a VPN, then break it and fix it.

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