A laptop running NetworkManager has never connected to the wireless network cafe-guest, which is protected by the passphrase Sunflower9. Which command joins it and creates a profile for future use?
LPIC-1 Exam 102-500, objective 109. Networking fundamentals medium
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How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
The options
Correct nmcli device wifi connect cafe-guest password Sunflower9
Correct. This associates with the SSID, stores the passphrase, and creates a connection profile named after the SSID so the laptop reconnects automatically later.
Not correct nmcli connection up cafe-guest
Wrong. `nmcli connection up` activates a profile that already exists. With no profile for that SSID yet, it fails with an unknown connection error.
Not correct nmcli radio wifi on
Wrong. That only enables the wireless radio, a prerequisite for scanning and connecting. It never selects a network or supplies a key.
Not correct nmcli device connect wlan0
Wrong. This asks NetworkManager to activate the device using the best available existing profile. It knows nothing about a new SSID and cannot be given a passphrase.
Why
`nmcli device wifi connect SSID password KEY` is the one-shot form that both associates and stores a profile; `nmcli device wifi list` shows what is in range and `nmcli device wifi rescan` forces a fresh scan first. The discriminator against `nmcli connection up` is whether a profile already exists: connection verbs need one, `device wifi connect` creates one. For a hidden network the same command takes the extra argument `hidden yes`.
Where this comes from
- Cited
- manual page nmcli(1)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 109 and space the ones you get wrong.
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