Stitching users across devices is critical for accurate GA4 insights. Test your understanding of User‑ID setup, Google signals, and identity hierarchy updates released in 2025.
GA4 derives User‑ID view by sending `user_id` with every event; if absent GA4 falls back to ______.
App Instance ID
IP address
Session ID
Device ID / Client ID
In 2025, cross‑device reporting needs at least ______ signed‑in users over 30 days.
10k
100
1k
50k
User Explorer report lists ‘Signed‑in’ label for events containing ______.
device_id
user_id
advertising_id
ga_session_id
Identity stitching hierarchy (2025) ranks first ______ > device ID > modeled.
Google signals
Session ID
Hashed email
User‑ID
Exported BigQuery `user_pseudo_id` corresponds to ______.
Transaction ID
Client ID or App Instance ID
User‑ID
GA Measurement ID
Google signals requires users with Ad Personalization enabled and ______ linked to property.
Google Ads account
Firebase DB
Merchant Center
Play Console
Cross‑device paths report visualizes sequences up to ______ touchpoints.
50
10
5
Unlimited
When user logs out, developers should call ______ to avoid mis‑stitching.
resetAnalyticsData
setUserId(null)
clearAppInstanceId
disableAnalytics
GA4 2025 allows up to ______ unique user_id values per property per day.
100k
Unlimited
10M
1M
User‑ID coverage is shown under Admin → Reporting Identity and must exceed ______% to enable User‑ID chart set.
1
90
5
50
Starter
Revisit the key user-id & cross-device docs and SDK guides, then attempt again.
Solid
Good command of user-id & cross-device—review edge cases to level up.
Expert!
Stellar! Your user-id & cross-device knowledge is cutting‑edge.
