The correct answer is: guest SSID.

Quick Scoop: What That Means

A guest SSID is a special wireless network name created just for visitors. When you connect phones, tablets, or laptops to this guest network, they get internet access only , while your internal devices and files remain protected on a separate, private network.

Think of it like this:

Your main Wi‑Fi is the “staff-only” door, and the guest SSID is the “lobby Wi‑Fi” that never lets visitors into the back office.

Why Not The Other Options?

The original multiple‑choice style question usually lists options like:

  • MAC address filtering
  • Guest SSID
  • Encryption
  • Authentication

Here’s why guest SSID is the best match:

  1. MAC address filtering
    • Controls which devices can connect, based on hardware addresses.
    • It does not by itself restrict them to “internet only”; it’s more about allow/deny access at all.
  1. Encryption (like WPA2/WPA3)
    • Protects data going over Wi‑Fi.
    • It does not separate guests from your internal network; it just makes traffic confidential.
  2. Authentication
    • Verifies who is connecting (passwords, portals, etc.).
    • Again, it doesn’t automatically limit guests to just the internet.
  3. Guest SSID ✅
    • Designed specifically for visitors.
    • Routers often let you configure this SSID so it can:
      • Reach only the WAN/internet.
      • Be blocked from your LAN, printers, servers, etc.

So, if you’re answering an exam or quiz:

Use a guest SSID to let visitors connect to Wi‑Fi while restricting them to internet access only.

Real‑World Example (Story Style)

Imagine you run a small cafĂŠ in ZĂźrich. You have:

  • A private Wi‑Fi for your POS system and office PC.
  • A guest Wi‑Fi (guest SSID) for customers.

You configure the guest SSID so it can:

  • Get an IP address and DNS from the router.
  • Reach the internet (WAN).
  • But cannot see your office PC, network printers, or NAS.

Many modern routers even have a simple toggle like “Guest network: Internet only / No local access” exactly for this purpose.

Mini FAQ

Q: Can I use firewall rules instead of a guest SSID?
A: Yes, in advanced setups, you might combine a guest SSID with its own VLAN and firewall rules to allow only internet and block all local subnets. But in exam questions, the clean conceptual answer is still guest SSID.

Q: Is client isolation the same as a guest SSID?
A: Client isolation stops Wi‑Fi clients from talking to each other, but it doesn’t necessarily stop them from reaching your LAN. A guest SSID is meant to separate guests from your internal network entirely.

TL;DR:
To allow visitors’ mobile devices to connect to Wi‑Fi but limit them strictly to the internet, you use a guest SSID on the wireless router or access point.

Information gathered from public forums or data available on the internet and portrayed here.