Network Audit Guide

This guide explains how a network audit helps you build an accurate picture of your current network and identify clear priorities for remediation and improvement.

What is a Network Audit?

A Network Audit is a structured current-state review of an organisation’s network infrastructure, configuration and dependencies. It documents how the network is built and operated across switching, routing, wireless, WAN, connectivity, addressing, VLANs, redundancy and key security controls.

Who it’s for

Organisations without an accurate network baseline, with inherited or organically grown environments, planning change, or needing to understand technical and lifecycle risk across the network.

Common use cases

Enterprise campus networks Core, distribution and access networks serving office users, endpoints and local services
Data centre networks Switching and routing environments supporting servers and storage
Multi-site WAN estates Branches and remote sites connected through MPLS, internet, SD-WAN or other WAN services
Mixed wired and wireless campuses Environments where switching, WiFi, addressing and access policy need to be understood together
Post-merger or acquired networks Infrastructure inherited through acquisition, merger or organisational change
Multi-vendor network estates Networks containing equipment and management platforms from several vendors or generations

Why Organisations Perform Network Audits

Build a clear view of the network estate to reduce risk, protect connectivity and plan improvements.

Establish Network Visibility

Create an accurate current-state view so teams can understand devices, connectivity and network dependencies.

Correct Configuration Risks

Identify inconsistent, incorrect or risky settings before they create avoidable operational issues across the estate.

Resolve Performance Constraints

Find links, devices or design limitations that are restricting network performance and affecting service delivery.

Protect Network Resilience

Confirm redundancy and failover arrangements can maintain connectivity when network components are unavailable.

Manage Lifecycle Risks

Highlight ageing, unsupported or end-of-life infrastructure that could increase operational and support risk.

Prioritise Network Improvements

Turn audit findings into a practical order for remediation, refresh and wider network modernisation work.

Common Network Challenges

Network assessments commonly identify issues across configuration, hardware, performance and visibility that can affect support and connectivity.

Configuration Inconsistency

Different standards, outdated templates or ad hoc changes can create faults, security exposure and difficult troubleshooting.

Ageing Hardware

Legacy switches, routers, wireless or supporting components may have limited performance and reduced access to fixes or parts.

Performance Bottlenecks

Congested links, oversubscribed uplinks, interface errors or insufficient bandwidth can restrict application performance and user connectivity.

Resilience Gaps

Single links, devices, power feeds or weak failover paths can leave critical network services exposed to individual failures.

Limited Visibility

Missing telemetry, monitoring or centralised management can obscure utilisation, faults, traffic behaviour and developing performance issues.

Documentation Gaps

Incomplete diagrams, asset records, addressing information and configuration documentation can make the live network harder to support safely.

Network Audit

What We Assess

We assess six key areas across your physical and logical network to understand how it is configured, performing and supported.

Our Assessment Scope

These core review areas help us evaluate the live network so configuration gaps, bottlenecks and infrastructure risks can be prioritised.

01

Network Architecture

  • Physical and logical topology
  • WAN and site connectivity
  • IP addressing and tiered design
02

Switching & Routing

  • Routing protocols and path configuration
  • VLANs and Layer 2 design
  • Device configuration consistency
03

Wireless Networking

  • Access points and controllers
  • Coverage, client demand and uplinks
  • WLAN integration with wired network
04

Security & Access

  • ACLs and segmentation
  • Management access and authentication
  • Firewall and secure-access dependencies
05

Performance & Capacity

  • Bandwidth utilisation
  • Latency, packet loss and errors
  • Capacity and resilience headroom
06

Operations & Lifecycle

  • Hardware and software lifecycle
  • Monitoring and documentation
  • Support status, change control and ownership
Assessment Outcome

The audit provides a current-state view of network health, risk and capacity, with clear priorities for remediation, optimisation and lifecycle action.

Network Audit: Assessment Approaches

Choose the approach based on whether the priority is configuration, inventory, performance or lifecycle risk.

01
Approach

Configuration Audit

Best suited to

Networks needing configurations and standards checked for consistency and risk.

Advantages
  • Finds configuration drift and outdated settings
  • Supports standardisation with corrective evidence
Considerations

Requires current configuration backups and sufficient device access.

02
Approach

Infrastructure Audit

Best suited to

Organisations needing a physical and logical network inventory.

Advantages
  • Creates a trusted network baseline
  • Reveals undocumented or ageing assets
Considerations

Discovery can be incomplete where documentation or coverage is poor.

03
Approach

Performance Audit

Best suited to

Networks with congestion, latency, loss or application performance complaints.

Advantages
  • Identifies where performance is constrained
  • Distinguishes capacity issues from faults
Considerations

Meaningful audits need data from representative busy periods.

04
Approach

Lifecycle Audit

Best suited to

Estates with mixed generations, expiring support or outdated software.

Advantages
  • Maps end-of-support and software risk
  • Helps prioritise replacement and upgrades
Considerations

Lifecycle status alone should not drive replacement.

How Our Network Audit Guide Works

The audit follows a structured six-stage process, from scope definition and network discovery through configuration review, risk analysis and a clear report on next steps.

Stage 01 Discovery & Scope

Together, we confirm which devices, sites and network services are in scope, along with any known concerns. We also agree whether the audit will focus on security, resilience, lifecycle or standards compliance, so the review addresses the right operational risks.

Assessment Checklist

Before the assessment begins, we will ask you to provide, share or arrange the network information, access and documentation needed for the review.

Network Inventory

Provide an up-to-date inventory of in-scope network devices, including model, software version, location, role and support status where available.

Network Diagrams

Supply current logical and physical network diagrams covering sites, WAN, LAN, wireless, internet edge and key interconnections.

Device Configurations

Provide current configuration backups or exports for in-scope devices, including relevant routing, switching, interface, VLAN, redundancy and management settings.

Management Platform Access

Arrange read-only access to the management, controller, configuration, monitoring or logging platforms needed to review device state and consistency.

Performance & Monitoring Data

Share representative utilisation, latency, packet-loss, interface-error, availability, alert and traffic data for the environment in scope.

Support & Lifecycle Information

Provide warranty, maintenance, vendor-support and lifecycle information for key devices, including planned refresh and known support milestone dates.

Our Network Assessment Best Practices

These principles guide how we assess the current network, validate its baseline and identify issues that affect operation, resilience and supportability.

Validate Documentation Against Reality

We compare diagrams, IP plans, circuit details and device inventories with the discovered network so documentation gaps are captured during the audit.

Review Configuration Standards

We compare routing, switching, security, management and access configurations against agreed standards to identify drift, inconsistency and unnecessary operational variation.

Analyse Performance & Availability

We review latency, packet loss, utilisation, interface errors and device availability across representative periods to identify degradation and persistent constraints.

Assess Resilience & Failover

We assess redundant links, routing paths, power dependencies and critical-device failover to determine whether required services can continue during component failure.

Review Hardware Lifecycle Status

We review hardware age, software support, contracts and end-of-life status so lifecycle exposure is prioritised alongside technical findings.

Revalidate the Current State

We assess major changes and accumulated configuration drift against the current baseline so recommendations reflect how the network operates now.

Assessment Deliverables

Following the assessment, you receive documented network findings, risk registers and prioritised actions based on the current estate reviewed.

Assessment Output

Network Audit Report

A detailed current-state audit covering network inventory, topology, device configuration, software levels, routing and switching behaviour, management practices and supporting evidence gathered.

Assessment Output

Configuration & Performance Findings

A structured record of configuration inconsistencies, performance concerns, errors, capacity constraints and other technical findings affecting network reliability or supportability.

Assessment Output

Risk & Lifecycle Register

A prioritised register of operational, resilience, security and lifecycle risks, including ageing or unsupported devices, configuration weaknesses and dependencies requiring remediation.

Assessment Output

Prioritised Recommendations

A ranked set of corrective and improvement actions to address urgent network risks first and plan lower-priority optimisation or lifecycle work appropriately.

Why Choose Steel City Consulting for Network Audits

We work with IT teams across complex network environments to assess current infrastructure, identify risks and gaps, and establish the practical next steps for performance, resilience, capacity and lifecycle planning.

  • Independent multi-vendor expertise Assess requirements across complex, multi-vendor infrastructure environments.
  • Decades of IT expertise Practical consultancy across architecture, deployment, optimisation and modernisation.
  • Assessment through implementation Move from findings into remediation, design and infrastructure deployment.

Network Audit

Discuss Your Network Audit

Tell us about your current environment, the issues you want to assess and any planned changes or projects. We’ll discuss the scope of the audit and what you need it to establish.

From Assessment Findings to Action

Where the assessment identifies gaps or improvement opportunities, Steel City Consulting can support the next stage, from remediation and infrastructure design through to implementation and ongoing optimisation.

Remediation & Optimisation

Address performance, capacity, resilience, configuration and lifecycle issues.

Architecture & Design

Turn findings into a practical target architecture and prioritised plan.

Technology & Implementation

Select, size and implement infrastructure required to address identified needs.

Ongoing Optimisation & Lifecycle

Validate improvements and support future capacity, lifecycle and modernisation needs.

Planning a network audit?

Speak to our consultants about your current environment, key concerns and what you need the audit to establish.

Speak to a specialist today

Related Technology Guides

Network audit findings often feed into campus design, optimisation, switching refresh and lifecycle planning; these guides cover the main areas that follow from the audit.

Campus Networking Architecture & Design Guide

Understand how switching, wireless, segmentation, resilience and management are combined into a scalable enterprise campus design.

Read the guide

Network Optimisation Guide

See how routing, capacity, latency, traffic flow and QoS can be analysed and improved using measured network behaviour.

Read the guide

Network Switching Modernisation Guide

See how ageing campus and data-centre switching can be refreshed around capacity, PoE, uplinks, automation, lifecycle and migration requirements.

Read the guide

Technology Refresh Guide

Understand how lifecycle, support, performance, risk and business priorities are combined into a phased infrastructure refresh plan.

Read the guide

Network Audit Guide FAQ

When should we commission a network audit?

A network audit is useful when documentation is incomplete, recurring issues lack a clear cause, or a refresh requires a reliable view of the existing environment.

It helps establish what is deployed, how key systems connect and where operational or lifecycle risks sit. That baseline supports decisions about remediation, capacity, resilience and future network design for your team.

Do we have an accurate picture of how our network is actually built today?

We compare available diagrams and records with device configurations and network discovery to identify gaps in the current network picture.

Networks often change faster than documentation. We verify important devices, links and connections so teams can plan maintenance or redesign using a more dependable view of the live environment and day-to-day operations.

Where are the hidden single points of failure?

We trace critical network paths through devices, links, power and upstream connections to identify components whose failure could interrupt service.

Redundancy shown on a diagram may still share a common device, route or power source. We examine how critical services connect and highlight dependencies that should be tested or addressed in resilience planning.

Are configuration gaps or inconsistent standards creating risk?

We review device configurations, software versions and operational standards to identify inconsistencies that could increase security or reliability risk across sites.

Examples include unsupported versions, unmanaged devices or differences between systems that make changes harder to control. We prioritise findings by operational impact and explain where standardisation or remediation would reduce risk.

Where are capacity or performance constraints likely to appear?

We examine link utilisation, device capacity, error rates and traffic patterns to identify network areas approaching performance or resilience limits.

Current averages can hide peak-time congestion or a lack of headroom during failover. We consider normal and peak behaviour alongside planned growth, helping your team identify where monitoring, configuration or capacity changes may be needed.

Which network devices are nearing end of support or due for replacement?

We review device age, software support status, condition and role in the network to identify hardware that may create lifecycle risk.

A device can remain operational while becoming harder to secure, maintain or replace quickly. We show which equipment needs attention first and how its role and dependencies affect refresh timing.

What should we fix first after a network audit?

We prioritise findings by service impact, security exposure, failure likelihood and dependencies, then identify practical actions for the network team.

This separates urgent risks from improvements that can be planned later. The recommendations can be grouped into remediation, lifecycle and design work, giving teams a realistic sequence for changes and investment.

Will the assessment disrupt live services, and what happens during it?

A network audit usually reviews configurations, monitoring and documentation, so it can be completed without changing live network services or production devices.

We agree scope and access with your team before collecting information. Any validation that could affect devices, links or users is planned separately, with timing and safeguards agreed before it occurs.

What will we be able to decide once the assessment is complete?

You will have a verified network baseline, a prioritised view of risks and constraints, and recommendations to guide remediation or future design.

The findings help teams decide what to retain, improve or replace and which actions should happen first. They also provide a clearer basis for refresh planning, resilience improvements and investment discussions.

Can Steel City Consulting help us act on the findings?

Yes, we can turn audit findings into a network roadmap and support design, sourcing, implementation, integration and ongoing lifecycle management.

We can work with your team to address priority issues and shape future changes around business requirements and the existing estate. Discuss your network findings with our team to plan a practical next step.