GlossaryNetwork
Firewall
A firewall is the security device or service that inspects traffic entering, leaving and crossing your network and allows or blocks it by rule, protecting your systems from the internet and from each other.
01 In depth
What it is, why it matters and what to ask a vendor
Modern business firewalls, from vendors such as Fortinet, do more than block ports: they identify applications, filter web content, inspect for malware, terminate VPNs for remote staff, and enforce the rules between VLANs. NIST Special Publication 800-41 remains a plain guide to firewall policy and placement.
For a growing business the firewall is where security policy becomes real: which systems the internet may reach, which staff may reach what from home, and which internal networks may talk to each other. It is also a performance point: an undersized or badly configured firewall adds latency to every call and meeting that crosses it.
Ask who writes and reviews the rules and how often, whether the firewall is sized for your internet speed with inspection turned on, how remote access is secured (MFA on every VPN login), whether logs are kept and watched, how updates are applied, and what the support contract covers. Ask for the rule set to be documented in plain language you could hand to an auditor.
03 At Telxpress
Where this shows up at Telxpress
The pages and articles where this term does real work: what we advise, build and support.
- Page
Business Networking, Firewalls & Managed Wi-Fi
Switching, routing, Fortinet firewalls, Ubiquiti and Cisco Meraki Wi-Fi and managed network services for offices that depend on reliable connections.
- Article
Fortify Your Enterprise: Best Practices for a Secure Business Network
The layered network security practices that hold up in real offices, from patching and MFA to Wi-Fi hardening, tested backups and an incident plan, including the phone system.
- Industry
AI & Business Technology for Financial Services
AI use cases for banks, advisors and lenders with GLBA, FINRA and SEC recordkeeping in mind, plus the systems we install and support.
04 Sources
Public references
The standard or law this definition rests on, as published by its owner. Fetched and checked on the review date above.