SOC vs NOC vs SIEM: What Each One Does for Your Business

A SOC (security operations center) is the team that watches your systems for attacks and responds to them; a NOC (network operations center) is the team that keeps networks, servers and internet connections up and performing. A SIEM is neither a team nor a room: it is the log platform a SOC works from. In short, a NOC asks whether everything is working and a SOC asks whether it is safe.

A small business seldom staffs either one in-house. It buys both as services, sometimes from different providers, and the gaps sit between them. For what an outsourced SOC involves and costs, see SOC as a service for small business.

What is the difference between a SOC and a NOC?

What is a SIEM vs a SOC?

The SIEM is a tool and the SOC is the people. NIST defines a SIEM tool as an application that gathers security data from information system components and presents it as actionable information through a single interface (NIST glossary). A SOC can work without a SIEM, from XDR and EDR consoles. A SIEM without a SOC is a log archive with alerts nobody reads.

The two meet in incident response. NIST's current guidance, SP 800-61 Revision 3 from April 2025, builds incident response into an organization's cybersecurity risk management under the NIST Cybersecurity Framework 2.0, with aims that include preparing for incidents, reducing their number and impact, and improving detection, response and recovery. The SOC's job does not end at the alert, and the SIEM's records are what the later steps rely on.

What does a NOC watch in a small business?

For a company with one or a few offices, NOC work is mostly done by the managed IT provider's monitoring tools and engineers rather than a room of screens. A monitoring agent on each computer and server reports health to a central console, and network equipment is polled for status. Typical checks:

• Internet circuits and the backup connection: up, down, dropping packets or saturated.
• Firewalls, switches and Wi-Fi access points: online, firmware current, ports and power within limits.
• Servers and computers: disk space, failed services, patch status and event log errors.
• Backup jobs: whether last night's job ran and finished.

Each check has a threshold and an owner. A disk at 95% is a ticket; a circuit down at 2 a.m. is a call to the carrier.

Where do the NOC and SOC overlap?

Often in the same event, seen two ways. An illustrative example: at 1 a.m. a file server starts sending far more data to the internet than usual. The NOC sees a saturated uplink and a slow office in the morning; the SOC sees possible data theft. If the two teams do not share alerts, each may close its half as handled. Overlaps worth agreeing in writing:

• Firewall and VPN logs, which both teams read for different reasons.
• Changes. A NOC change to a firewall rule can look like an attacker's change to the SOC, so changes should be recorded where both can see them.
• Patching and backups, NOC tasks with security consequences.
• The first phone call when an outage might be an attack: who makes it, and to whom.

Which fits a small team?

Illustrative situations, not client stories:

• A 15-person office with one site and cloud apps. NOC-style monitoring through the managed IT provider's tools, plus managed detection and response as the SOC for endpoints. A SIEM only if someone requires logs.
• A multi-site firm with VoIP phones and an on-premises server. Circuit and switch monitoring matters as much as security monitoring, because an outage stops the phones.
• A regulated firm that must keep searchable logs. A SOC working from a SIEM, with retention sized to the rule.
• A company whose own IT team runs the network. Keep the NOC work in-house and buy SOC monitoring as a service, with the handoff for suspicious network events written down.

How are SOC and NOC services staffed and priced?

Around-the-clock coverage is the expensive part of both. A week has 168 hours and a full-time employee works about 40, so covering one seat every hour takes more than four people before vacations, which is why small businesses rent this coverage instead of hiring for it. Pricing follows what is watched:

• NOC monitoring is priced per device or site, or included in a per-user managed IT fee, with the coverage hours and alert thresholds set in the agreement.
• SOC monitoring depends on the sources connected, data volume, retention, coverage hours and what happens after an alert.
• The SIEM underneath is priced by data. Microsoft Sentinel charges per GB with the first 90 days of retention included, according to its billing guide, and its East US pay-as-you-go list price is $4.30 per GB as of October 2026; managed options price differently, such as Huntress's Managed SIEM at an MSRP of $4.00 per data source per month on its pricing page.

What should a SOC or NOC agreement say?

The same six terms decide whether either service helps at 2 a.m.:

1. Coverage hours, and what happens outside them.
2. Severity levels defined with examples from your environment.
3. Target times to acknowledge an alert and to reach your named contact, per severity.
4. Actions the provider may take without asking, such as isolating a device or failing over to a backup circuit.
5. How a silent log source or monitor is detected and fixed.
6. What reports show and how long records are kept.

How does NetSys cover both?

We run both sides under separate scopes, so the commitments stay clear. On the operations side, managed clients' devices are monitored 24/7 through NinjaOne, and our network management service sets which switches, access points and circuits are watched, with the alert thresholds, coverage hours and escalation contacts agreed in the scope. On the security side, our SOC monitoring service scopes the log sources, retention, severity levels and containment authority. Our help desk is staffed seven days a week from 4 a.m. to 11 p.m. Eastern, and monitoring and emergency service run 24/7. Those are distinct commitments, and the agreement says which apply to you.

Book a call with a NetSys engineer to map what is watched today, by whom, and at what hours.

Frequently asked questions

What is a SIEM vs a SOC?

A SIEM is software that collects and correlates security logs and raises alerts. A SOC is the team that reviews those alerts, investigates and responds. A SOC uses a SIEM among other tools; a SIEM needs a SOC, in-house or outsourced, to be worth its cost.

Is a NOC the same as a help desk?

No. A help desk answers people: password resets, broken printers, how-to questions. A NOC watches the infrastructure itself, often before anyone notices a problem. In a managed IT agreement they usually work together, with monitoring alerts turning into tickets the help desk or an engineer handles.

Can one provider run both the SOC and the NOC?

Yes, and it can close the gap between them, as long as the agreement still separates the commitments: what is monitored for availability, what is monitored for security, the coverage hours of each, and who may act without calling you.

What affects cost, implementation and support?

For a NOC, the devices, sites and coverage hours; for a SOC, the sources, data volume, retention and response authority. Implementation means connecting every monitored device and log source and testing that alerts reach the right person. Support depends on the escalation contacts and pre-approved actions.

Is SOC monitoring the same as MDR?

They overlap. SOC monitoring describes a function that reviews security activity from the connected sources; MDR describes managed detection, investigation and response, usually starting from endpoint tools. Compare the actual sources watched, who reviews them, what the provider may do on its own authority and where incident response hands off, rather than the label.

Does a small business need its own SOC?

Rarely. Staffing one seat around the clock takes more than four people, so small businesses buy SOC monitoring as a service and keep the decisions that only the business can make, such as who is called and what may be shut off.