The Art of Network Engineering
Network engineering, explained

What Is Network Engineering?

Network engineering is the practice of designing, building, and operating the computer networks that move data between systems. A network engineer is the practitioner responsible for that infrastructure: the routers, switches, firewalls, wireless systems, and cloud services that keep the internet, enterprises, and applications connected.

A working definition

A network is what lets two computers talk to each other. Network engineering is the discipline of making that conversation possible at every scale: between two devices on a desk, between buildings on a campus, between a data center and the cloud, and between billions of devices across the global internet. Network engineers own the design choices, the configuration, the security, the performance, and the day-to-day operation of those networks.

What a network engineer does

The work is broader than the title implies. On any given week a network engineer might be doing several of the following:

  • Designing a new network for a site, data center, or cloud region.
  • Configuring routers, switches, firewalls, load balancers, and wireless controllers.
  • Troubleshooting an outage or performance complaint, often with packet captures and logs.
  • Writing automation scripts (commonly Python) to apply changes across hundreds of devices.
  • Hardening the network against threats: ACLs, segmentation, zero trust controls.
  • Planning capacity, refreshing hardware, and budgeting for the next fiscal year.
  • Working with cloud, security, and application teams whose work depends on the network.

How it differs from related fields

The IT world has many specializations, and the lines between them have blurred. Here is how network engineering relates to the most common ones:

  • System administrator: focuses on servers, operating systems, and application services. A sysadmin keeps the workload running. A network engineer makes sure the workload can talk to anything else.
  • DevOps / platform engineer: builds the pipelines, tooling, and infrastructure that let software teams ship code. Network engineers increasingly partner with these teams to expose the network as code.
  • Site reliability engineer (SRE): owns the reliability of a service end to end. SREs often lean on network engineers when an incident lives below the application layer.
  • Cloud engineer: designs and runs workloads on AWS, Azure, or Google Cloud. The cloud has its own networking layer (VPC, subnets, peering, transit, route tables) that network engineers are often called in to design.
  • Security engineer: builds and operates security controls. Many of those controls live in the network: firewalls, segmentation, intrusion detection, secure access. The two roles overlap heavily.

The skills network engineers need

The core of the job has not changed much in twenty years: IP addressing, subnetting, routing, switching, wireless, firewalls, and the protocols underneath. What has changed is what surrounds the core.

A network engineer in 2026 needs to be comfortable with at least the basics of:

  • Scripting and automation. Python is the dominant language. Ansible is common for declarative changes.
  • APIs, JSON, and YAML. Modern network platforms are configured through these as often as the CLI.
  • Cloud networking. VPC and equivalent constructs in AWS, Azure, and GCP.
  • Observability. Telemetry, streaming metrics, flow data, log aggregation.
  • Source control. Git, pull requests, code review for network configuration.
  • The application layer. Understanding what the application is doing makes you a far better engineer.

Career paths and how to break in

Most network engineers do not start as network engineers. The common entry points are the help desk, a NOC (network operations center), a field technician role, or a junior sysadmin position. From there, engineers move into a junior network engineer title, then network engineer, then senior network engineer or specialization paths: wireless, security, automation, cloud, design, architecture.

There is no required degree. A four-year computer science or IT degree helps, but the field is full of people who came in through the military, the trades, retail tech jobs, self-taught study, and full career switches in their thirties and forties. What matters more than credentials is curiosity, hands-on practice, and showing up.

The most reliable acceleration is community. People hire the people they know. Conferences, user groups (PANUG, USNUA, local Cisco user groups), Discord servers, and podcasts are how most working network engineers stay current and how most opportunities surface.

Certifications

Certifications are not required to do the work. They are useful for three reasons: they give self-study a structure, they help your resume clear automated filters, and they are a clear signal to interviewers that you have invested time in the fundamentals. The most common tracks:

  • Cisco: CCNA, CCNP, CCIE. Still the most widely recognized.
  • Juniper: JNCIA, JNCIS, JNCIP, JNCIE.
  • Vendor-neutral: CompTIA Network+, Network Engineering Foundation.
  • Vendor cloud: AWS Advanced Networking, Azure Network Engineer, Google Professional Cloud Network Engineer.
  • Aruba, Arista, Palo Alto, Fortinet for specialized work.

Where the field is going

Three forces are reshaping network engineering at once. Cloud has moved a large fraction of new workloads off of traditional on-premises networks and onto software-defined cloud constructs, which network engineers are now expected to design and operate. Automation has moved the day-to-day from box-by-box CLI to code, pipelines, and infrastructure-as-code repositories. AI is starting to change both how networks are operated (assistive troubleshooting, anomaly detection, natural-language network queries) and what networks have to carry (the bandwidth and latency demands of training and inference workloads).

None of this has reduced demand for network engineers. It has raised the bar on what the role looks like.

Where to go from here

The Art of Network Engineering has published 200+ episodes with practicing network engineers, architects, vendors, educators, and career-changers. A handful of episodes that pair well with this page:

Or browse the full catalog of AONE episodes.