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JCAC Mod 5 iOS Components and Structure

Information Technology3 CardsCreated 4 months ago

This deck covers key components and structures of iOS, including the update process, the role of the boot ROM, and the XNU kernel.

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iOS Kernel

XNU Kernel

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Key Terms

Term
Definition

iOS Kernel

XNU Kernel

iTunes or Over-the-Air

Updates to iOS can be accomplished either using iTunes installed on a computer with the device attached or via Over-the-Air (OTA) on the device its...

Boot ROM

When an iOS device is powered on, the application processor executes code from the boot ROM. Boot ROM code cannot be modified once created and is w...

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JCAC Mod 5 iOS Components and Structure
TermDefinition

iOS Kernel

XNU Kernel

iTunes or Over-the-Air

Updates to iOS can be accomplished either using iTunes installed on a computer with the device attached or via Over-the-Air (OTA) on the device itself. Updates can also be downloaded to a local network server running OS X Server so devices can be updated without connecting to a server.

Boot ROM

When an iOS device is powered on, the application processor executes code from the boot ROM. Boot ROM code cannot be modified once created and is written onto the chip during fabrication. It is implicitly trusted and contains the Apple Root public key used to verify the Low-Level Bootloader (LLB) is signed by Apple before allowing it to load.