What Is QoS?

by Priya Nakamura Updated Apr 12, 2026

QoS (Quality of Service) is a router feature that lets you prioritize certain types of network traffic. It ensures that important activities like video calls or gaming get bandwidth even when others on the network are downloading large files.

How QoS Works

Without QoS, your router treats all traffic equally — a large download can consume all bandwidth, causing video calls to buffer. QoS lets you set rules: give video calls highest priority, regular browsing medium, and downloads lowest.

When to Use QoS

Enable QoS if multiple people share your network and you experience lag during video calls or gaming while others are using bandwidth. See our QoS setup guide.

Related Guides

Video Tutorial

For more information, see RFC 791 — Internet Protocol.

Pro Tip: Understanding the OSI model isn't just academic — it helps you troubleshoot by isolating which layer a problem occurs at.

Key Takeaways

Private IPs (192.168.x.x, 10.x.x.x) are used inside your home network
DNS translates domain names to IP addresses
DHCP automatically assigns IPs so you don't have to
Your default gateway is your router's IP address

Frequently Asked Questions

What is QoS on a router?

QoS prioritizes network traffic so important activities (gaming, video calls) get bandwidth first, even when the network is busy.

Should I turn on QoS?

Yes, if you have multiple users and experience slowdowns during important activities. It's especially useful for gaming and video conferencing.

About Priya Nakamura

Priya is a telecommunications engineer and networking educator at RouterHax. With a background in ISP infrastructure and a Master's in Computer Networks, she explains complex networking concepts in plain English. Priya covers WiFi standards, protocols, IP addressing, and network architecture.