Ch 12

Disk Format

Before a partition can be used by the user or the system, it must be formatted.

PRI (Primary Rate Interface)

A type of ISDN that uses 23 bearer channels and one 64-Kbps data channel, represented by the notation 23B+D.

Walled garden

An online environment only containing child-safe content. It offers a high level of security for younger uses but may be a bit too restrictive for older members of the family.

An instructor is discussing facts about different mobile device operating software. The instructor states: "This OS can be used by programmers to operate devices like laptops, smart TVs, and e-book readers." To which OS does this relate: iOS, Android, or both?

Android

What are two features of the Android operating system? (Choose two.)

Android is open source and allows anyone to contribute to its development and evolution. Android has been implemented on devices such as cameras, smart TVs, and e-book readers.

APFS

Apple File System

A company is creating a new website to be hosted on a Linux server. The system administrator creates the group "webteam" and assigns team members to it. The administrator then creates the directory "webpages" for storing files. Later that day, one of the team members reports of being unable to create files in the "webpages" directory or subdirectories. The administrator uses the ls -l command to view the file permissions. The result displayed is drwxr-xr--. What should the administrator do to allow team members to add and edit files?

Issue the command chmod 775 -R webpages.

What is a purpose of the boot manager program?

It allows the user to select the OS to use to boot the device.

Which feature of an Android or iOS mobile device helps prevent malicious programs from infecting the device?​

Mobile device apps are run in a sandbox that isolates them from other resources.

Mount or Unmount disk partitions

On Unix-like systems, mounting a partition relates to the process of binding a partition of a disk or a disk image file (usually a .iso) to a folder location.

Jailbreaking

Process of making unauthorized modifications to operating systems and bypassing the DRM restrictions on Apple iPhones and iPads in order to run unapproved apps.

Query S.M.A.R.T. attributes

S.M.A.R.T. can detect and report attributes about a disk's health. The goal of S.M.A.R.T. is to anticipate disk failure, allowing the user to move the data to a healthy disk before the failing disk becomes inaccessible.

Accelermeters

Sensor inside a mobile device

A user presses the Recent Apps icon on an Android-based smartphone to see a list of recently used apps. What should the user do to remove an app from the list?

Swipe the app to either side.

What is the purpose of signature files used to secure mobile devices and operating systems?

They contain sample code from known viruses and malware that is used by security software to identify malicious software.

Source Code

The sequence of instructions that is written in human readable language, before it is turned into machine language (zeroes and ones).

A user has an iOS device. What will happen if the user forgets the passcode to unlock the device?

The user must perform a full restore from a backup saved in iTunes or iCloud.

Bad Sector Check

When a disk sector is flagged as bad, it becomes harmless to the OS because it will no longer be used to store data. Many bad sectors could be an indicator of a failing disk. Disk utilities can salvage data stored in bad sectors by moving it to healthy disk sectors.

Partition management

When working with computer disks, partitions may need to be created, deleted or resized.

A person with an Android mobile device holds down the power button and the volume down button until the device turns off. The person then turns the device back on. What was this person doing to the device?

a standard reset of the device

Which two location-specific services can the GPS feature on a mobile device offer? (Choose two.)

delivering local advertising displaying local weather information

What two preventive maintenance tasks should be scheduled to occur automatically?

executing a backup checking the disks for bad sectors

Which Linux file system introduced the journaled file system, which can be used to minimize the risk of file system corruption in the event of a sudden power loss?

ext3

What are two types of cloud-enabled services for mobile devices? (Choose two.)

locator apps remote backup

mobile device user notices that the system update includes an update of the Primary Rate ISDN (PRI). What is the function of the PRI?

mobile device user notices that the system update includes an update of the Primary Rate ISDN (PRI). What is the function of the PRI?

A system administrator is using the crontab command to edit an entry on a Linux server. Which service is the administrator configuring?

scheduling a task to run at a specific time and date

True of False?Android and OS X are based on the Unix operating system.

true

What command is used to open a text editor in a Linux system?

vim

What three tasks can be done with the iOS device Home button? (Choose three.)

wake the device return to the home screen open audio controls

Which model does Apple use to provide iOS apps to customers

walled garden