What Does a Network Engineer Actually Do?

1What Is a Network Engineer?

A network engineer designs, builds, and maintains the infrastructure that lets computers and devices communicate — routers, switches, firewalls, and the physical or virtual links that connect them.

The role exists because reliable communication between devices doesn't happen automatically at scale: someone has to plan how traffic flows, prevent bottlenecks, and keep the network available and secure as an organization grows.

2Core Responsibilities

The day-to-day work of a network engineer covers more than keeping the internet connection running.

• Designing network architecture: planning how offices, data centers, and cloud environments connect to each other.
• Configuring hardware: setting up routers, switches, and firewalls to route traffic correctly and enforce security rules.
• Monitoring performance: watching for congestion, latency, or outages using dedicated monitoring tools.
• Troubleshooting: diagnosing why a connection is slow, dropping, or unreachable, often under time pressure.
• Securing the network: configuring firewalls, VPNs, and access controls to keep unauthorized traffic out.

3Foundational Networking Skills

Regardless of which vendor's hardware an organization uses, the underlying concepts stay the same, and a network engineer needs a solid grasp of them.

IP addressing and subnetting, routing protocols, switching, and the layered OSI model are the concepts most of the day-to-day work builds on. Without this foundation, configuring hardware becomes guesswork rather than deliberate design.

4The Growing Role of Cloud Networking

Many organizations now run hybrid infrastructure spanning on-premises hardware and one or more cloud providers, which means network engineers increasingly need to understand virtual private clouds, cloud load balancers, and cloud-native security groups alongside traditional hardware.

This shift hasn't replaced traditional networking knowledge — it has added a cloud layer on top of it, so both skill sets are typically needed together rather than one replacing the other.

5Networking and Security Are Closely Linked

The network is one of the most common entry points for an attacker, which puts network engineering close to cybersecurity in practice. Misconfigured firewalls, open ports, and weak segmentation are frequent causes of real breaches.

Because of this overlap, many network engineers develop security-adjacent skills over time, and some transition into dedicated security engineering roles later in their careers.

6Certifications and Hands-On Experience

Vendor certifications are a common way to demonstrate networking knowledge and are often used as a screening signal by employers, since they confirm a baseline understanding of core concepts and specific hardware platforms.

That said, hands-on experience configuring, breaking, and fixing real networks — including in home lab environments — matters just as much as certification, since so much of the job is practical troubleshooting under pressure.

7Getting Started as a Network Engineer

Building a solid foundation in core networking concepts is the natural starting point before specializing in any particular vendor's hardware or a cloud platform.

SkillVeris's Study Notes on Computer Networks work through these fundamentals — addressing, routing, switching, and the OSI model — in the structured depth this role requires before moving on to hardware- or cloud-specific tools.