Why Network Engineers Automate

The job doesn't change — the day does

Most network engineers didn't get into this work because they love typing show running-config for the fortieth time in a row. They got into it for the troubleshooting, the design decisions, the moments where something's broken and figuring out why actually matters.

But a lot of the actual day fills up with something else: logging into devices, one at a time, to run the same handful of commands and note what came back. Some teams have a name for this kind of work — operational toil: necessary, but repetitive, manual, and something that doesn't get easier no matter how many times you've done it.

Network automation exists because toil is a bad use of a skilled engineer's time, not because the checks themselves are unimportant. The NTP check, the compliance sweep, the config backup — those all still need to happen. The question is who keeps repeating them.

A useful way to think about it

Automating a task doesn't mean the task stops mattering. It means a script does the repeating, and you spend your attention on the parts that actually need a person — reading the result, deciding what to do about it, and everything else on your plate.

Where the time actually goes

If you map out a typical week for someone managing more than a handful of devices, a surprising amount of it looks like this:

A nightly compliance sweep — logging into a sample of switches to confirm VLAN trunking, AAA (TACACS+), and NTP settings haven't drifted from baseline.
A weekly configuration backup — pulling show running-config from every device and saving it somewhere safe, in case a change goes wrong.
Provisioning new switches during a refresh — the same hostname, management IP, AAA, NTP, and VLAN config, applied device after device.
Gathering diagnostics during an incident — show ip interface brief, show logging, show cdp neighbors pulled from dozens of devices while trying to figure out what's actually down.

None of these are hard. Each one, on its own, takes a few minutes. The cost is that they happen constantly, on more than one device, and they compete for the same hours as the design work and troubleshooting that actually needs your judgment.

Quick checkConcept check

Which of these best describes why network engineers automate repetitive tasks?

To avoid needing networking knowledgeBecause a script never makes a typo, so it's automatically safer than any manual changeTo free up time spent repeating the same steps across many devices, for the design, troubleshooting, and judgment calls that actually need a personBecause manual CLI access is being phased out

A scenario worth pausing on

Say an engineer spends every Friday afternoon manually confirming that TACACS+ settings are correctly applied on all 60 access switches in a building, before the weekend on-call rotation starts. Each switch: SSH in, run show run | include tacacs, compare against what it should say, log out. Sixty times.

That's a good automation candidate — not because TACACS+ is unimportant, but because the check itself is identical every time, it's done across many devices, and it happens on a predictable schedule. Automating it doesn't change what gets checked. It changes who does the repeating, and it means the check can run every day instead of once a week, because it no longer costs an engineer an afternoon.

Quick checkScenario

An engineer spends every Friday afternoon manually confirming TACACS+ settings on all 60 access switches. What makes this a good automation candidate?

It's a security-related setting, and security settings should always be automated firstIt's the same well-defined check, repeated identically across many devices, on a predictable scheduleIt only takes one afternoon, so it's not worth anyone's time to changeTACACS+ configuration never changes once it's set, so checking it is pointless either way

Automation doesn't replace the engineer

It's worth saying plainly: automation does not replace network engineers. A script can run show ntp status on 200 switches, but it can't decide why switch 23 keeps losing sync, whether that's worth escalating, or how to redesign the NTP hierarchy so it stops happening. Those are exactly the judgment calls automation frees you up to spend time on.

What actually changes

Automation removes repetitive execution — the typing, the logging in and out, the copy-pasting output into a spreadsheet. It doesn't remove the need for design, troubleshooting, validation, architecture decisions, or judgment calls. If anything, those get more of your attention once the repetitive parts stop eating the day.

Quick checkMyth check

What's the accurate way to describe automation's effect on a network engineer's role?

It replaces the need for network engineersIt removes repetitive execution so engineers can spend more time on design, troubleshooting, and validationIt has no real effect on day-to-day workIt only matters once a network is enormous

Why this matters more as a network grows

Checking five switches by hand is fine. It's barely worth automating. Checking fifty by hand is tedious, but survivable. Checking five hundred by hand, on a recurring schedule, without missing one or mistyping a command halfway through the afternoon — that stops being realistic for a person to do reliably, no matter how careful they are.

This is the part that catches people off guard: automation doesn't just save time as a network grows, it becomes necessary for the check to stay reliable at all. A script runs the exact same command, the exact same way, on device 1 and device 500. A tired engineer on their thirtieth SSH session of the afternoon is a lot more likely to skip a device or misread an output than a script is.

Quick checkConcept check

As a network grows from 5 devices to 500, what changes about doing a repetitive check by hand?

Nothing — it takes the same effort either wayIt becomes far more likely that a step gets skipped, mistyped, or forgotten somewhere along the wayIt gets easier, because engineers get faster with practiceIt becomes impossible to check the devices at all

A quick gut-check

You don't need a formal framework yet to start spotting these moments (there's a fuller one later in this module) — a rough gut-check is enough for now:

Am I doing this exact same thing on more than one device?
Do I expect to do it again — tomorrow, next week, next month?
Would a mistake here (a skipped device, a missed detail) actually cost something?

If the answer to those is mostly "yes," you've probably found a task worth automating.

Start small

Most engineers' first automation isn't ambitious — it's one script that does one recurring check they were already doing by hand. That's the right place to start. The scale comes later, once the pattern is proven.

Key takeaways

Repetitive, manual CLI work — 'operational toil' — is a bad use of a skilled engineer's time, even though the checks themselves matter.
Automation changes who repeats a task, not whether the task needs to happen.
A good automation candidate is the same well-defined check, done across many devices, on a recurring basis.
Automation doesn't replace engineers — it frees up time for design, troubleshooting, validation, and judgment calls that a script can't make.
As a network grows, manual repetition doesn't just get slower — it gets less reliable, which is exactly what automation fixes.
A quick gut-check — repeated across devices? happens again? does a mistake cost something? — is enough to start spotting automation candidates.

What you'll learn