Networks & office IT
Development, infrastructure, SEO, AI and IT for business — short and to the point.
60 articles
- Networks & office IT4 min
Asterisk and FreePBX for a Small Office: Setup and Pitfalls
FreePBX on Asterisk gives an office a flexible phone system with no per-user fees, but it needs an admin, correct NAT settings and strict protection against SIP attacks; without an admin, a cloud PBX is the safer choice.
Advanced - Networks & office IT4 min
Guest Wi-Fi with a Captive Portal for Cafes, Hotels and Clinics
A captive portal is the page guests see before getting online, where they log in by SMS, voucher or a button, accept the terms and give consent; pick the login method that local law requires, limit sessions and keep the guest network separate from the work one.
Practice - Networks & office IT4 min
How to Calculate Storage and Bandwidth for Video Surveillance
Archive size equals total camera bitrate times recording time: one camera at 1 Mbit/s writes about 10.8 GB per day, so multiply by bitrate, cameras, days and the share of time actually recorded, then add a margin.
Practice - Networks & office IT4 min
Cloud PBX vs On-Premise PBX: Which Phone System to Choose
A cloud PBX suits most companies that want a fast launch without their own server or admin, while an on-premise PBX makes sense with heavy internal calling, strict data storage requirements and an in-house IT specialist.
Basics - Networks & office IT4 min
How to Block Malicious and Unwanted Sites with DNS Filtering
A DNS filter refuses to return addresses for dangerous or banned domains, so the site simply does not open; set up a filtering cloud DNS or your own Pi-hole/AdGuard Home on the router and close the bypass routes — other DNS servers, DoH and VPNs.
Practice - Networks & office IT4 min
How to Keep the Office Online: Dual WAN and LTE Backup
Connect a second ISP over a different medium (for example fibre plus LTE) to a Dual WAN router, configure automatic failover based on reachability checks and test it regularly.
Practice - Networks & office IT4 min
IT Onboarding and Offboarding Checklist for Employees
On day one a new hire gets ready accounts, a device, role-based access and licenses from a prepared list; on departure you walk the same list backwards — revoke access that day, hand over data and collect the equipment.
Practice - Networks & office IT4 min
Ethernet Cable Categories: Cat5e vs Cat6 vs Cat6a
Cat5e reliably carries 1 Gbps over 100 m, Cat6 handles 10 Gbps only on short runs, and Cat6a delivers 10 Gbps over the full 100 m; for a new office, solid-copper Cat6a or at least Cat6 is the sensible choice.
Basics - Networks & office IT4 min
Fiber vs ADSL vs 4G/5G Internet for Business: How to Choose
If fiber is available at your office address, make it your main line and use 4G/5G as a backup; keep ADSL only for places with no other option.
Basics - Networks & office IT4 min
How to Organize Shared Folders and Access Rights on a File Server
Build a shallow folder tree by department, grant rights only to groups (never to individual users) at the top levels, give everyone the minimum access they need, and protect data with snapshots.
Practice - Networks & office IT4 min
Weak Wi-Fi in the Office: How to Find and Fix Dead Zones
Map the signal with a heatmap survey, then fix dead zones by moving access points to the ceiling near users, tuning channels and transmit power, and adding cabled access points instead of repeaters where coverage is still weak.
Practice - Networks & office IT3 min
GLPI vs Snipe-IT vs Spreadsheets: Tools for IT Inventory
A spreadsheet is enough for a small office with a stable fleet, Snipe-IT is great for tracking which employee has which device, and GLPI fits when you need agent-based automatic inventory plus a built-in helpdesk.
Advanced - Networks & office IT4 min
How to Set Up a Separate Guest Wi-Fi Network in the Office
Create a separate SSID in its own VLAN that can reach only the internet, enable client isolation, limit bandwidth per guest, rotate the password regularly or share it via QR code, and test that internal addresses are unreachable.
Practice - Networks & office IT4 min
How to Choose a Business Phone System and VoIP Provider
Choose a business phone system by your workflows, not the per-minute price: the right numbers, recording, IVR and queues, a ready integration with your CRM, clear analytics and support that actually answers — and test it all during a trial.
Practice - Networks & office IT4 min
How to Choose a Video Surveillance System for an Office or Shop
Start from goals and a floor plan: decide what each camera must see, match the lens and resolution to that zone, record to an NVR, the cloud or both, set a retention period and put up surveillance notices.
Practice - Networks & office IT4 min
How to Choose a NAS for the Office: Synology, QNAP or DIY
Choose a NAS by usable capacity with a growth margin, the number of bays for RAID, and the software you will actually maintain: Synology for simplicity, QNAP for hardware flexibility, DIY when you have in-house expertise.
Practice - Networks & office IT4 min
How to Choose an Office Printer or MFP: Laser, Inkjet or Lease
Choose by cost per page and real print volume, not by device price: an office with regular printing is usually best served by a networked laser MFP with scan to folder, and high volumes justify pricing a lease or managed print.
Practice - Networks & office IT4 min
How to Choose a Router for an Office: Key Specs to Check
Pick a router by its real throughput with firewall and VPN enabled, the number of concurrent users and devices, two WAN ports, VLAN and VPN server support and a vendor with regular firmware updates — not by the speed printed on the box.
Practice - Networks & office IT4 min
How Wi-Fi Works: A Plain Guide for Office Managers
Wi-Fi is a shared radio channel where an access point and its devices take turns to transmit, so real speed depends on signal through walls, channel congestion and how many devices share each access point.
Basics - Networks & office IT4 min
Hybrid Work IT Checklist: Equipment, Access and Security
Hybrid work rests on four things: a managed, encrypted laptop, sign-in with MFA plus VPN or cloud services, one shared file store and a clear support process that works the same at home and in the office.
Practice - Networks & office IT4 min
Internet Speed Explained: Mbps, Ping, Jitter and Packet Loss
Mbps shows how much data passes per second, ping shows delay, jitter shows how unstable that delay is, and packet loss shows how much data never arrives; calls need stability, file transfers need bandwidth.
Basics - Networks & office IT4 min
IP Cameras vs Analog CCTV: Differences, Pros and Cons
IP cameras deliver more detailed images, run power and data over one network cable via PoE and support analytics, while analog systems are simpler and can be cheaper when upgrading existing coaxial wiring.
Basics - Networks & office IT3 min
Managed vs Unmanaged Switch: Which One Your Office Needs
An unmanaged switch just connects devices, while a managed one lets you split the network into segments (VLANs), prioritise traffic and see what's happening; you need one as soon as the office has guest Wi-Fi, IP phones, cameras or several switches.
Basics - Networks & office IT4 min
How to Equip a Meeting Room for Video Calls
Choose equipment by room size, invest first in audio and room acoustics, pick a room system or BYOD based on how people actually run meetings, wire the gear to the network and verify everything with a test call.
Practice - Networks & office IT4 min
MikroTik Router Basic Setup for a Small Office
Start from the default configuration, change credentials and block management from the internet, set up WAN, LAN and DHCP, keep the default firewall, put guests on a separate network and save export and backup files regularly.
Practice - Networks & office IT4 min
Network Printer Not Printing: How to Set It Up and Fix It
Most network printer problems are solved by a fixed address (a DHCP reservation), adding the printer by IP instead of auto-discovery, clearing the print queue and using a cable instead of Wi-Fi.
Practice - Networks & office IT5 min
How to Monitor an Office Network: SNMP, Zabbix and Alerts
Collect the health of uplinks, switches, access points, UPS, NAS and printers via SNMP into a tool such as Zabbix, and send to Telegram only alerts that require action, with delays and dependencies to cut the noise.
Advanced - Networks & office IT4 min
Office Relocation IT Checklist: Moving Without Downtime
Start by ordering internet at the new office because it takes longest, then check the cabling, inventory and label equipment, port your phone numbers and move over a weekend with a checklist of tests for Monday.
Practice - Networks & office IT4 min
pfSense vs OPNsense vs MikroTik: Choosing an Office Firewall
OPNsense is the best fit for most offices with x86 hardware and built-in IDS/IPS, pfSense is a mature alternative with a huge knowledge base, and MikroTik is a compact, affordable router for admins fluent in RouterOS who do not need built-in IPS.
Advanced - Networks & office IT4 min
QoS in an Office Network: Prioritizing Calls, Video and Critical Apps
QoS does not add bandwidth — it decides which packets go first when a link is congested, so it works where you control the bottleneck: your upload to the ISP, the LAN and Wi-Fi.
Advanced - Networks & office IT4 min
RAID Levels Explained: RAID 0, 1, 5, 6 and 10
RAID combines several drives into one array for speed or to survive a drive failure: RAID 1 and 10 mirror, RAID 5 and 6 use parity, RAID 0 only adds speed — and no level replaces a backup.
Basics - Networks & office IT4 min
Remote Access to Office Computers: RDP, VPN or Remote Desktop Apps
For everyday employee work, RDP over VPN or an RDP gateway with 2FA is the safest choice; remote desktop apps suit one-off support; an RDP port open to the internet is never acceptable.
Practice - Networks & office IT4 min
IT Setup for a Retail Store: POS, Internet, Wi-Fi and Cameras
Split the store network into segments for POS, card terminals, cameras and guests, give the tills a backup internet link, put critical equipment on a UPS and run a launch checklist with a test sale before opening.
Practice - Networks & office IT4 min
Router and Wi-Fi Security Checklist for a Small Office
Change the router admin password, update firmware, use WPA3 or WPA2-AES, turn off WPS, UPnP and remote admin, put guests on a separate network and regularly review the list of connected devices.
Practice - Networks & office IT4 min
Router vs Switch vs Access Point: What Each Device Does
A router connects your office to the internet and to other networks, a switch connects wired devices inside the office, and an access point adds Wi-Fi to that wired network; home-style combo boxes do all three, while growing offices usually split them.
Basics - Networks & office IT4 min
SD-WAN vs MPLS vs VPN: Connecting Branch Offices
A few branches usually do fine with site-to-site VPN over the internet, MPLS buys a predictable carrier link at the cost of flexibility, and SD-WAN pays off when you have many branches, several links per site, heavy cloud traffic and need central control.
Advanced - Networks & office IT4 min
How to View IP Cameras Remotely Without Exposing Them Online
The safest way to watch cameras remotely is through a VPN to the office network; a vendor P2P app is an acceptable compromise, while forwarding camera or NVR ports to the internet should be avoided.
Practice - Networks & office IT4 min
Site-to-Site vs Remote Access VPN: Differences and Use Cases
A site-to-site VPN permanently links whole networks, such as a head office and a branch, through routers, while a remote access VPN connects individual employees from their laptops and phones through a client app.
Basics - Networks & office IT4 min
Slow Internet in the Office: Step-by-Step Troubleshooting
First test speed over a cable plugged straight into the router: if it is fine, the problem is Wi-Fi or the local network; if not, it is the router or the ISP. Then narrow it down step by step.
Practice - Networks & office IT4 min
How to Set Up a Small Office Network from Scratch
Start with a list of people, devices and services, then pick an ISP, a business router, a managed PoE switch and ceiling access points, and split the network into staff, guest and device segments with a written IP plan.
Practice - Networks & office IT4 min
How to Plan Structured Cabling and a Server Rack for an Office
Plan at least two ports per workplace plus drops for Wi-Fi, printers and cameras with spare capacity, terminate everything on patch panels in a rack with proper power and ventilation, and require labeling, test reports and as-built drawings from the installer.
Practice - Networks & office IT4 min
How to Configure VLANs on a Switch and Router Step by Step
Plan VLAN IDs and subnets, make device ports access and links to the router and access points trunks, route VLANs on the router, block traffic between them by default, give each VLAN its own DHCP and test isolation.
Advanced - Networks & office IT4 min
Echo, Delays and Dropped VoIP Calls: Causes and Fixes
Most VoIP problems are network problems: packet loss and jitter cause robotic, choppy audio, SIP ALG and NAT timeouts cause one-way audio and drops, and echo usually comes from a headset or speakerphone. Disable SIP ALG, enable QoS and keep-alive, use cable.
Practice - Networks & office IT4 min
What Is a Business VPN and How It Works
A business VPN creates an encrypted tunnel over the internet through which an employee or branch office securely reaches the company's internal resources as if they were in the office.
Basics - Networks & office IT4 min
What Is DHCP and How Devices Get an IP Address
DHCP is a service, usually on the router, that automatically gives each device an IP address, gateway and DNS for a limited time (a lease); printers, cameras and servers should get fixed addresses through reservations so they never change.
Basics - Networks & office IT4 min
IT Asset Management for Small Business: What to Track and Why
IT asset management is one up-to-date list of hardware, software and subscriptions with owner, serial number, warranty and licenses; it shows what you pay for and makes replacement, repair and data protection easier.
Basics - Networks & office IT4 min
What Is MDM and How Companies Manage Work Laptops and Phones
MDM is a system a company uses to centrally configure, secure and, when needed, wipe work laptops and phones without touching each device by hand.
Basics - Networks & office IT4 min
What Is Mesh Wi-Fi and When an Office Needs It
Mesh Wi-Fi is a set of nodes that act as one network and pass traffic to each other, ideally over cable; it suits small offices without cabling, while larger or demanding offices are better served by wired, centrally managed access points.
Basics - Networks & office IT4 min
What Is a NAS and Does Your Office Need One
A NAS is a small server with drives that plugs into the office network and shares files with everyone; you need one when the cloud falls short on speed, capacity or control over your data.
Basics - Networks & office IT4 min
NAT and Port Forwarding Explained: Public vs Private IP
Devices in an office use private IPs that are not reachable from the internet; NAT on the router lets them all go online through one public IP, and port forwarding opens a specific service to the outside, which is convenient but exposes it to attacks.
Basics - Networks & office IT3 min
What Is a Network Firewall and How It Protects an Office
A firewall decides which traffic may enter and leave the office network based on rules; for a small office the foundation is blocking all inbound connections by default and allowing remote access only through a VPN.
Basics - Networks & office IT4 min
What Is PoE (Power over Ethernet) and Which Devices Need It
PoE (Power over Ethernet) lets a device receive both data and electrical power over a single twisted-pair cable, so IP cameras, phones and access points don't need a separate power outlet.
Basics - Networks & office IT4 min
What Is a UPS and How to Size One for Office Equipment
A UPS is a battery with electronics that keeps equipment running through outages and power fluctuations; size it by watts with headroom and by the runtime your router, NAS and server need.
Basics - Networks & office IT4 min
What Is a VLAN and Why Office Networks Use Them
A VLAN splits one physical network into several isolated logical ones, so guests, staff, cameras, phones and servers share the same switches and cables but cannot reach each other unless the router allows it.
Basics - Networks & office IT4 min
What Is IP Telephony (VoIP) and How It Works for Business
IP telephony (VoIP) carries voice over the internet or the office network instead of copper phone lines, so calls can be answered on any device, routed flexibly between staff and connected to your CRM.
Basics - Networks & office IT4 min
Wi-Fi 6 vs Wi-Fi 6E vs Wi-Fi 7: What Changes for an Office
Wi-Fi 6 is enough for most offices; 6E adds the clean 6 GHz band, and Wi-Fi 7 adds wider channels and multi-link connections, which pay off only in busy spaces where most laptops and phones already support them.
Basics - Networks & office IT4 min
2.4 GHz vs 5 GHz vs 6 GHz Wi-Fi: Which Band to Use
Use 5 GHz as the default for work devices, keep 2.4 GHz for range and older or simple devices, and add 6 GHz for the newest devices in busy spaces; usually one staff SSID across bands is better than one per band.
Basics - Networks & office IT4 min
Wi-Fi Channel Planning and Interference in Dense Offices
In a dense office, Wi-Fi gets faster through order rather than power: narrow channels in 5 GHz, only 1/6/11 in 2.4 GHz, lower AP power, sensible roaming thresholds and placement for capacity rather than coverage.
Advanced - Networks & office IT4 min
How to Set Up a WireGuard VPN for Remote Employees
Run WireGuard on a router, VPS or office server, give every device its own key pair and VPN IP, list only office subnets in AllowedIPs, and remove the peer from the server when someone leaves.
Practice - Networks & office IT4 min
WPA Enterprise Wi-Fi with 802.1X and RADIUS: Setup Guide
WPA Enterprise replaces one shared password with personal credentials or certificates checked by a RADIUS server via 802.1X, so you can revoke a single user, see who connected and put each person in the right VLAN.
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