In macOS 10.13.4, there is a new tab for caching ctent in Mac Activity Mitor. It gives you detailed statistics the data you are broadcasting for iOS devices. This should give you a better idea of the caching you are doing, data that is being served or dropped, and give an overall picture of your cache network
iCloud Ctent Caching is a feature of macOS High Sierra and it is useful if you have a lot of Apple devices in your home. This is a feature that can help reduce your Wi-Fi bandwidth when it comes to software updates for Mac, iPhone, iPad and Apple TV.
[ Apple releases macOS High Sierra 10.13.4 with Business Chat, eGPU, Messages iCloud, Plus ]
With ctent caching enabled, your Mac can save the staging files up to date for your devices. This means that instead of your devices asking Apple's servers to update, they instead get the update from your Mac. It's great because it means you do not have to install the update multiple times, just ce.