Network Assessment Checklist: 8 IT Issues That Cause Slowdowns, Outages and Security Gaps

Why does a network that once supported the business without trouble begin struggling with cloud applications, video calls, wireless devices, and remote access?

Occasionally the answer is a failed component. More often, recurring problems involve several connected issues. Aging hardware may be operating near capacity. Wireless coverage may no longer suit the office layout. A backup internet connection may exist but fail to take over during an outage. Critical dependencies may not appear in any current documentation.

In a network assessment, you consider the performance, connections, failures, and recovery of the whole environment. It enables a business to recognize an isolated fault rather than a wider infrastructure problem requiring planned attention.

The checklist below outlines eight things a business network assessment should look at, what employees might see, and what the technical review should confirm.

What Is a Network Assessment?

A network assessment is a structured examination of an organization’s wired, wireless, Internet, remote access, and cloud connectivity environment.

The assessment looks at how users, devices, applications, locations, and external services communicate. It looks for issues in performance, resilience, security, documentation, and future capacity.

Day-to-day troubleshooting is usually related to a current fault. A network assessment poses broader questions:

• Why did the problem occur?
• Could the same failure affect another part of the environment?
• Which business services depend on the affected equipment?
• Can the network recover when a critical component fails?
• Will the current design support planned growth?

A network audit is often used as a related term, particularly when the review includes equipment inventories, configuration records, and documentation checks. A network security assessment is narrower in its security focus. A penetration test is an active search for exploitable weaknesses.

An IT network assessment should provide a complete view of the environment rather than a collection of disconnected speed tests and hardware observations.

The Eight-Point Network Assessment Checklist

Use this quick-reference checklist to identify areas that deserve closer review.

One checked item may point to an isolated improvement. Several checked items usually indicate that the network should be reviewed as a connected system.

1. Incomplete Documentation and Unknown Dependencies

A network cannot be managed confidently when no one has a current view of how it is connected.

The equipment list may be out of date. Network diagrams may not include newer switches, cloud services or VPN connections. A critical application may rely on a device that was installed years ago and never documented.

These gaps tend to appear during transitions.

Firewall replacement kills an application that no one knew was dependent on a specific rule. An office move drops a device connected through an unknown switch. When an incident happens the technicians need to rebuild the environment and it takes longer to recover.

The assessment should identify:

• Network devices and their physical or virtual locations
• Internet, cloud and site-to-site connections
• IP ranges, VLANs and routing relationships
• Business applications that depend on specific network paths
• Equipment that cannot be identified or accessed
• Records that no longer match the live environment

The Canadian Centre for Cyber Security suggests that an organization first determine which systems and assets it needs to protect, such as network devices, applications, and cloud services. A good place to start is its baseline cybersecurity controls for small and medium organizations.

2. Aging Equipment and Unsupported Firmware

Old equipment does not need to stop working completely to create business risk.

Throughput can be limited by an old switch. The increasing volume of encrypted traffic may be difficult for legacy firewalls to inspect. The wireless equipment may not have the capacity for the number of devices now in the office.

But unsupported firmware is another matter. Known security and stability issues may remain unpatched when vendors stop updates.

Employees may experience:

• Slow file transfers or application sessions
• Connections that drop during busy periods
• VPN performance that declines as more people work remotely
• Network devices that require frequent restarts
• New systems that cannot be supported without workarounds

The assessment should cover model numbers, firmware versions, warranty status, support dates, and current resource use. Replacements should be prioritized by business impact, security exposure, and risk of failure, not just age.

The result may be a phased infrastructure modernization plan rather than an immediate replacement of every older device.

3. Bandwidth Bottlenecks, Latency, Jitter and Packet Loss

A test of internet speed is just one test of network performance.

Even with a high-speed internet connection, a business can still have poor cloud application performance. The real bottleneck could be an overloaded firewall, a congested wireless network, an undersized VPN tunnel, or a slow connection between offices.

Different measurements have different problems:

• Bandwidth utilization shows how much available capacity is being used.
• Latency measures the delay between two points.
• Jitter measures changes in delay, which can affect voice and video.
• Packet loss shows whether data is being dropped during transmission.

Measurements should be performed on relevant network paths and during representative business periods. An early morning test may not catch a problem that only crops up when staff, cloud backups, and video meetings are all running simultaneously.

The assessment needs to determine whether the performance issue is coming from the local network, the internet edge, a VPN, or an external service.

Illustrative scenario: The slow application that was not an internet problem

Imagine a company that complains that its cloud-based accounting application slows to a crawl each afternoon.

The speed test could show that the internet circuit still has some capacity left. A deeper assessment might reveal that cloud backups are scheduled to run at the same time, traffic is flowing through an outdated firewall, and remote users are all using the same constrained VPN path.

The only complaint you can see is slow application. The root cause is a mix of scheduling, equipment capacity, and traffic design.

That is the difference in troubleshooting one symptom and looking at the entire environment.

4. Poor Wi-Fi Coverage and Access-Point Placement

The performance of wireless networking is not only a function of the number of access points installed.

Weak coverage can result in meeting rooms, stairwells, warehouses, or office corners due to poor placement. Interference occurs due to channel overlap and excess signal strength. What works for laptops may fail as soon as employees start plugging in phones, tablets, wireless headsets, and connected devices.

Common signs include:

• Devices disconnecting when users move between rooms
• Reliable service in one area and poor performance nearby
• Video calls failing in meeting rooms
• Slow wireless service during busy periods
• Guest devices interfering with business traffic

The assessment should include a review of signal coverage, interference, channel usage, access point placement, device density and roaming behaviour. The review should include building materials, floor plans and the function of each area.

This recommendation could be to move equipment, change radio settings, add capacity or redesign part of the wireless environment. Just putting another access point in without looking at channel usage and signal overlap can make performance less predictable.

GET A CLEARER VIEW OF YOUR NETWORK Arcadion’s IT Network Assessment reviews switching, routing, wireless infrastructure, firewalls, VPNs, cloud connectivity, redundancy, monitoring, and documentation. The assessment report identifies findings, business implications, and recommended priorities. Learn about Arcadion’s IT network assessment.

5. Single Points of Failure and Untested Failover

A network can look stable simply because its supporting components have not failed yet.

You can have a single firewall, core switch, internet circuit, power source, or VPN connection for an entire location. When that component goes down, employees may not have access to cloud applications, phones, payment systems, and other business services.

It does not automatically solve the problem of redundant equipment. The secondary link might be misconfigured, down, or unable to carry normal traffic. Failover may have been set up years ago and never tested.

The assessment should document:

• Single devices or connections that can interrupt critical services
• Backup internet and routing paths
• High-availability firewall configurations
• Switch uplinks and redundant core equipment
• Uninterruptible power supply coverage
• Failover procedures and test history
• Services that will remain unavailable after failover

Testing needs careful planning. Some failover checks might require a maintenance window, communication with the affected teams and a documented rollback procedure

It is testing, not assumptions, that should tell a business which failures the network can handle.

6. Weak Segmentation Between Users, Servers and Unmanaged Devices

A flat network allows too many devices to operate in the same trusted space.

Employee computers, servers, printers, cameras, guest devices, building systems and voice equipment have different purposes and different risk levels. They shouldn’t automatically have access to each other’s unlimited.

A weak network segmentation could lead to a larger blast radius for a compromised device. It can also make performance problems more difficult to contain and troubleshoot.

The assessment should consider whether the environment separates appropriate groups, such as

• Corporate users
• Servers and sensitive systems
• Guest wireless devices
• Voice systems
• Printers and connected office equipment
• Cameras, sensors and other Internet of Things devices
• Network management interfaces

Technical reviewers need to compare VLAN configurations, firewall rules, and access-control policies to actual business requirements. A system should only talk to the users, devices, and services it needs to.

• Arcadion’s network security services can address segmentation and access-control issues identified during the assessment.
• CISA’s Cross-Sector Cybersecurity Performance Goals provide practical guidance for reducing common security risks across critical systems and network environments.

7. Limited Monitoring, Logging and Alert Visibility

Many organizations only learn of network problems through complaints from their staff.

A switch may be collecting errors. There may be brief drops in an internet circuit throughout the day. The wireless access point may be overloaded. Without effective monitoring, these conditions can persist until they cause a noticeable disruption.

Data collection is just the start. Alerts need to be useful.

What a good alert should identify:

• What happened
• Which device or service is affected
• Whether the condition is unusual
• Who owns the response
• How serious the business impact may be
• What action should happen next

The assessment should specify which switches, firewalls, access points, VPNs, internet circuits and cloud connections are being monitored. It should look at log retention, alert thresholds, escalation routes, and coverage gaps.

We are not trying to add more notification. It’s to provide the responsible team with enough information to investigate before a minor fault can grow into a larger outage.

8. A Network Design That Cannot Support Business Growth

A network might work for the company as is, but not support what is to come.

The business might be planning a new office, a cloud migration, a major application, an acquisition or a larger remote workforce. Each change can increase traffic, devices, connections and security requirements.

Warning signs are:

• New applications requiring repeated network changes
• VPN services reaching user or throughput limits
• Different offices using inconsistent configurations
• Hardware purchases solving problems only temporarily
• New locations taking too long to connect securely
• Voice, video and cloud traffic competing for capacity

The assessment should be compared to the present environment and known business and technology plans. Capacity should be greater than the internet bandwidth. Consider switching, wireless density, firewall performance, IP addressing, remote access,, and monitoring.

Recommendations can include routing changes, new equipment, wireless redesign, SD-WAN, new redundancy, or a phased modernization program.

Arcadion’s article on how to build better IT networks provides further guidance on preparing infrastructure for future demand.

What Should a Network Assessment Deliver?

A thorough assessment should yield more than scan findings or a non-prioritized set of technical observations.

Leadership must understand what business risk looks like. IT teams need sufficient detail to validate the findings and plan corrective work.

The comprehensive evaluation shall deliver the following:

• A current network diagram
• An accurate equipment and connection inventory
• Performance findings supported by measurements
• Wireless coverage and capacity observations
• Resilience and failover gaps
• Security and configuration concerns
• Unsupported equipment and firmware findings
• Prioritized recommendations
• An executive summary for leadership
• Dependencies that affect implementation
• Clear next steps and suggested sequencing

Recommendations should be apportioned by urgency. Critical risks need urgent attention. Other improvements might be covered by regular maintenance, budget allocations, or a larger infrastructure project.

The NIST Cybersecurity Framework 2.0 promotes a risk-based approach where organizations identify current gaps, define desired outcomes, and prioritize improvements based on business needs.

What Arcadion’s Network Assessment Reviews

Arcadion reviews the network as a connected business system rather than testing each device in isolation.

The assessment covers five related areas:

1. Discovery and documentation

The review identifies equipment, network paths, external services, and critical business dependencies.

2. Performance validation

Traffic patterns, wireless conditions, and relevant network measurements are reviewed to find where delays, congestion, or packet loss begins.

3. Resilience review

Critical devices, connections, and power dependencies are examined to determine how the environment responds to failure.

4. Security and configuration observations

The review considers segmentation, access paths, firmware, firewall relationships, and network-management exposure.

5. Prioritized reporting

Findings are organized to separate urgent risks from planned improvements and longer-term recommendations.

Remediation can then be scoped according to priority, operational impact, and budget rather than treating every finding as equally urgent.

When Should a Business Schedule a Network Assessment?

A serious outage is an obvious reason to assess the network, but waiting for a failure can leave fewer options and less time.

An assessment is particularly useful:

• Before an office move or renovation
• Before opening or acquiring another location
• Before a cloud migration
• Before introducing a major business application
• After a serious or unexplained outage
• Before a compliance or insurance review
• When equipment is approaching the end of vendor support
• When users report the same wireless, VPN, or performance problem repeatedly
• When current network documentation cannot be trusted

A review before a major project can uncover cabling, capacity, security, and dependency issues before they affect the launch.

What to Prepare Before the Assessment Starts

Available records help the technical team begin with context. They do not need to be complete.

Useful materials include:

• Current or historical network diagrams
• Equipment and asset lists
• Firewall and internet-provider information
• Cloud and site-to-site connection details
• Configuration backups
• Office floor plans
• Recent outage or support history
• Known Wi-Fi, VPN or application concerns
• Existing monitoring access
• Planned office, staffing or technology changes

The organization should establish who is authorized to approve access to network devices and management portals. Before commencing any tests, the organization should communicate any restrictions around maintenance windows, production systems, or third-party providers.

Missing records are no reason to delay the assessment. They might be part of the problem the review is trying to document.

Request a Network Assessment Before the Next Disruption

Symptoms include slow applications, flaky Wi-Fi, and unstable remote access. Underlying problems may include aging equipment; weak documentation; poor traffic design; limited monitoring; or a failure path that has never been tested.

Structured network assessment provides a common view of the environment to technical teams and leadership. It identifies what requires immediate attention, what can be scheduled, and what dependencies may affect future projects.

Request a network assessment from Arcadion to identify performance, resilience, security, and capacity gaps before the next outage or technology change exposes them.

Book your appointment with our network specialists in Ottawa.