25. Manage Host Sharing and Personal Firewall

Question 1

1. Which sharing services can macOS High Sierra provide?

Answer 1

1. The macOS High Sierra Sharing Services include the following:
   * Remote Disk (DVD or CD sharing)
   * Screen Sharing
   * File Sharing
   * Printer (and scanner)
   * Sharing Remote Login
   * Remote Management (ARD)
   * Remote Apple Events
   * Internet Sharing
   * Bluetooth Sharing
   * Content Caching

Question 2

2. What is Content Caching?

Answer 2

2. Content caching is the downloading of software distributed by Apple and of data that users store in iCloud by saving content that local devices have already downloaded.

Question 3

3. Which app can provide on-demand screen sharing even when the Screen Sharing service isn’t enabled?

Answer 3

3. Messages provides on-demand screen sharing that you can use when the system screen-sharing service isn’t enabled.

Question 4

4. Which network service or services does Screen Sharing need in macOS High Sierra?

Answer 4

4. In macOS High Sierra, Messages screen sharing uses iMessage. Users on both Mac computers must sign in to iCloud.

Question 5

5. What’s AirDrop, and how do you know if a specific Mac supports it?

Answer 5

5. AirDrop provides a quick and easy way to share files within local Wi-Fi and Bluetooth range. AirDrop creates a secure peer-to-peer network between local devices. From the Finder Go menu, you can verify that a Mac supports AirDrop.

Question 6

6. If other devices with AirDrop enabled don’t appear in the AirDrop browser, which two settings on a Mac can you change to potentially make more devices appear?

Answer 6

6. On a late-model Mac, you’ll find two settings at the bottom of the AirDrop browser that control AirDrop discovery. The first setting expands AirDrop discovery from only users in your Contacts to everyone within AirDrop range. The second setting makes AirDrop revert to the previous discovery method, which allows your Mac to discover older Mac computers and Mac computers that run previous versions of Mac operating systems.

Question 7

7. In what primary way does the macOS built-in firewall differ from a traditional network firewall?

Answer 7

7. With the firewall built into macOS High Sierra, connections are allowed or denied on a per-app basis. This is unlike traditional network firewalls, where access rules are based on network service port numbers.

Question 8

8. In macOS High Sierra, what are the firewall settings?

Answer 8

8. In macOS High Sierra, these are the firewall settings:
   * Block all incoming connections.
   * Automatically allow built-in software to receive incoming connections.
   * Automatically allow downloaded signed software to receive incoming connections.
   * Enable stealth mode.