Networking & Infrastructure

What is IT infrastructure and networking? A plain-English guide for business owners

IT infrastructure and networking explained without jargon: the components a business relies on, on-premise versus cloud, and why small firms need it managed.

By Dig IT SolutionsUpdated 8 September 20265 min read

Short answer

IT infrastructure is everything a business's technology runs on: computers, servers, storage, software, cloud services and the facilities that house them. Networking is the part that connects it all: internet connection, firewall, switches, cabling, Wi-Fi and links between sites. Infrastructure provides the resources and networking makes them reachable. Most businesses now combine on-site equipment with cloud services.

Every business depends on technology it rarely thinks about until it stops. Email, files, the accounts system, the phones, the card machine, the CCTV: all of it runs on a layer of equipment, software and connections that is collectively called IT infrastructure and networking. This guide explains what those terms mean in practical terms, what a typical setup contains for a business of up to 250 people, and why it needs managing rather than simply installing.

The short definition

IT infrastructure is everything your technology runs on: computers and laptops, servers, storage, the software and operating systems, cloud platforms such as Microsoft 365, and the physical space (a comms cabinet, a server room) that houses the equipment.

Networking is the part that connects it all together and to the outside world: the internet connection, the firewall, switches, cabling, Wi-Fi access points and any links between offices.

A simple way to hold it: infrastructure provides the resources, networking makes them reachable. Neither is useful without the other.

The components of IT infrastructure

Hardware. End-user devices (laptops, desktops, phones, tablets), servers where the business still has them, storage such as a NAS, printers, VoIP handsets and the network equipment itself. Dig IT typically supplies HP and Dell business ranges for consistency and support.

Software. Operating systems (Windows 11 for most business PCs now that Windows 10 is unsupported), business applications (accounts, CRM, practice or job management systems), productivity and collaboration tools (Microsoft 365), and the management tools that keep everything patched and monitored.

Data storage and backup. Where files live (increasingly SharePoint and OneDrive rather than a file server), where backups go (a local device such as a Synology NAS plus a cloud copy) and how recovery works. Microsoft's own retention features are not a backup, which surprises many businesses. See backup and disaster recovery.

Cloud services. Email, files, identity and often the line-of-business application, delivered from a provider's data centre rather than a server in the office.

Facilities. For a small business this is usually a locked comms cabinet with a UPS, adequate ventilation and tidy cabling. It gets neglected, and it is where a surprising number of outages start.

On-premise, cloud or hybrid

Model	What it means	Typical fit
On-premise	Servers and applications run on equipment in your building	Businesses with a legacy application that must stay local, or very large local files
Cloud	Email, files and applications delivered from a provider (Microsoft 365, hosted line-of-business software)	Most businesses of up to 250 people for email, files and identity
Hybrid	Cloud for email, files and identity, plus a local server or NAS for specific workloads	The common reality: cloud-first with something kept on site for a good reason

Hybrid is where most businesses actually sit. Mr Plant Hire, a multi-depot plant hire business Dig IT has supported for over 15 years, runs Microsoft 365 and SharePoint alongside Windows servers, with local and cloud backup. See the Mr Plant Hire case study.

The components of networking

Internet connection. Full-fibre broadband (Openreach FTTP), SoGEA where fibre has not reached the premises, or a leased line where symmetrical, guaranteed bandwidth matters. The leased line versus business broadband guide covers the choice.

Firewall. The boundary between your network and the internet. A business firewall handles security inspection, VPN access for remote staff and site-to-site links. A consumer router from the broadband provider is not a substitute.

Switches. Connect wired devices and, with Power over Ethernet, run the access points, phones and cameras. Managed switches allow VLANs, which separate staff, guest, voice and camera traffic.

Cabling. Structured cabling (Cat6 or Cat6a) from the cabinet to every desk, access point and device. The least visible component and the one that lasts longest if done properly.

Wi-Fi. Access points placed on a survey of the building, on Wi-Fi 6, 6E or 7 depending on density and construction. Dig IT's usual platforms are Ubiquiti UniFi and Cisco Meraki, both cloud-managed.

Wide-area links. Site-to-site VPNs or SD-WAN connecting multiple offices into one network, as in the multi-site connectivity service.

Network security. Segmentation, firewall rules, MFA on the VPN, and monitoring. Security is a property of the network design, not a product added afterwards.

Why it matters to the business

Infrastructure and networking are invisible when they work and expensive when they do not. The practical reasons to take them seriously:

Productivity. Slow machines, dropped Wi-Fi and poor call quality cost staff time every day. The signs of an outgrown network are worth knowing.
Security. Unsupported firewalls, flat networks and unmanaged devices are how ransomware spreads. The GOV.UK Cyber Security Breaches Survey shows how routinely UK businesses are attacked.
Continuity. A single server, a single internet line or a single switch is a single point of failure. Designed infrastructure includes backup, failover and a tested recovery plan.
Growth. A network designed for 12 people cannot simply have 30 plugged in. Planned infrastructure scales by adding users, not by starting again.
Hybrid working. Remote staff depend entirely on the cloud services, identity system and office network being reliable and secure.
Compliance. UK GDPR, Cyber Essentials and client questionnaires all ask about the controls that live in infrastructure and networking.

Why small businesses need it managed

The equipment list for a 20-person office is short: a firewall, a switch or two, a few access points, laptops, Microsoft 365, a NAS and a phone system. What makes it work is not the kit but the ongoing attention: firmware updates, monitoring for faults, capacity changes as people join, security configuration that stays current, and someone who knows how it all fits together when something breaks.

Without that, networks drift. Consumer routers get added to fix coverage, guest devices end up on the same network as the accounts server, the firewall runs three years of unpatched firmware, and the one person who set it up has left. Professional network management gives a small business the same structured oversight a larger one gets from an IT department, at a predictable monthly cost. Dig IT's IT infrastructure and networking service covers design, installation and ongoing management, usually as part of managed IT support.

What a typical setup looks like

For a 20-person professional services office in Hertfordshire, a well-designed environment in 2026 would contain: Openreach FTTP with a 4G/5G failover, a supported business firewall with VPN, a managed PoE switch, three or four surveyed Wi-Fi 6 access points, Cat6 cabling to every desk, standardised Windows 11 laptops with EDR and remote management, Microsoft 365 Business Premium for identity, email and files, a Synology NAS for local backup plus cloud backup, an 8x8 cloud phone system, and UniFi Protect cameras if physical security is needed. None of it is exotic. All of it needs to be chosen and maintained on purpose.

What to do next

If you cannot describe your own infrastructure in the terms above, or nobody is responsible for keeping it current, an assessment will tell you where it stands. Dig IT's IT health check covers infrastructure, network, security and backup for businesses across Hertfordshire, west Essex and London.

Frequently asked questions

What is the difference between IT infrastructure and networking?

Infrastructure is the whole set of technology resources a business runs on: devices, servers, storage, software, cloud platforms and the rooms that house equipment. Networking is the subset that connects those resources: the internet connection, firewall, switches, cabling, Wi-Fi and links between sites. Without infrastructure there is nothing to connect. Without networking, the infrastructure sits in isolation.

Does a small business need formal IT infrastructure?

Yes, though it can be simple. A 10-person firm typically needs a business firewall, a managed switch, surveyed Wi-Fi, standardised laptops, Microsoft 365 for email and files, a backup that is tested, and a phone system that survives the PSTN switch-off. That is a small amount of kit, but each part has to be chosen, configured and maintained deliberately.

Is cloud infrastructure secure?

The major platforms are secured to a standard few businesses could match on site. Most cloud breaches come from how the customer configures it: weak passwords without MFA, over-broad sharing, admin accounts used for daily email, and no backup. A cloud service configured badly is no safer than an unpatched server in a cupboard. The controls are the customer's responsibility.

Can a business run on Wi-Fi only?

It can, and many small offices do, but it is a compromise. Wireless is shared, subject to interference and slower under load than a cable. The usual approach is wired connections for anything fixed and demanding (desktops, VoIP phones, printers, servers, access points themselves) and Wi-Fi for laptops, phones and visitors.

How often should infrastructure be reviewed?

Formally once a year, with security patches applied as they are released. Expect laptops to be replaced every three to four years, servers and switches every five to seven, firewalls when they leave vendor support and Wi-Fi access points as standards move on. An annual review keeps the refresh planned rather than reactive.

What does professional network management include?

Monitoring of every device for faults and performance, firmware and security updates, configuration control, Wi-Fi and capacity tuning, security management (firewall rules, segmentation, VPN, access), fault resolution and planning for growth. For a business without in-house IT it is usually delivered as part of a managed IT support contract.