Computer Networking · Advanced level

Advanced level · Module 2: Wireless Networks at Scale · Lesson 1 of 4

Site Surveys

Measure and plan wireless coverage before installing equipment.

In this lesson you will

  • Conduct a basic site survey
  • Identify obstacles and interference

Key concepts

predictive surveyon-site surveysignal strengthinterference

The lesson

A predictive survey uses floor plans and wall materials to estimate coverage; an on-site survey measures real signal strength.

Concrete, metal and water absorb signal; neighbouring networks and devices cause interference.

Aim for strong signal (for example, better than −67 dBm for voice and video) throughout working areas.

Step by step

  1. Mark walls and materials on the plan.
  2. Measure signal at points.
  3. Identify interference.
  4. Mark weak areas.

Practice activity

Survey the provided building plan.

Expected result: A survey map with signal and problem areas.

Check your understanding

  1. What does an on-site survey measure?

    Show answer

    Real signal strength and interference.

  2. Which materials weaken Wi-Fi most?

    Show answer

    Concrete, metal and water.

Taught live by an instructor — online or in person. Free course lessons are for self-study and do not lead to a certificate — see registration options.