Reference no: EM133218216

Question 1.

Which of the following are ways in which the Layers pattern structures software apps and infrastructure (choose all that apply):

Partitions an overall system architecture into groups of subtasks

Enables end-to-end communication by specifying how data should be (un)packetized, addressed, transmitted, routed, and received

Decomposes groups of subtasks into levels of abstraction

Provides services beyond the operating system and protocol stacks to enable components in a distributed system to communicate and manage data

Question 2

Which of the following are reasons that layering is applied in Android (choose all that apply):

Enables "plug and play" replacement of certain layer implementations

Increases context switching, synchronization, and data copying overhead

Enhances systematic software reuse

Reduces the complexity of APIs that app developers must understand

Question 3

Which of the following are implications of being "higher" in the memory hierarchy of a modern computing device (choose all that apply):

CPU access latency is higher

Cost is greater

Memory bandwidth is slower

CPU access latency is lower

Question 4

Which of the following are correct statements of Android linux RAM (choose all that apply):

User space is a less restrictive protection domain than kernel space

Android Linux executes in kernel space RAMA

All Android apps execute in user space RAM

Apps running in user space can never access RAM of other apps

Question 5

Which of the following are true statements about Android's local and remote inter-process communication (IPC) mechanisms (choose all that apply):

TCP/IP is used to access the Internet

UNIX domain sockets are used to communicate with remote UNIX servers

The Binder driver supports highly optimized LAN and WAN communication

These IPC mechanisms reside within the kernel's device driver framework

Question 6

Which of the following are true statements about processes in Linux (choose all that apply):

A process provides units of execution for instruction streams that run on processor cores

Processes appear at multiple layers in the Android software stack

A process provides a unit of resource allocation and protection

A process contains one thread by default

Question 7

Which of the following are true statements about the Android Hardware Abstraction Layer (HAL) (choose all that apply):

It is implemented in user space and is written largely in C/C++

It is implemented in kernel space to optimize performance and is written largely in C

It's open source license ensures that all HAL driver implementations are available in open-source form

It is implemented in user space and is written largely in Java

It shields higher layers of Android's software stack from Linux kernel idiosyncracies

Android apps rarely access the HAL directly

Question 8

Which of the following are true statements about the the "Android Runtime" (ART) execution environment that are not true for the Dalvik VM execution environment (choose all that apply):

It executes standard Java Bytecode

It provides a better garbage collector

It provides an "Ahead-of-Time" (AOT) compiler

it provides a Just-in-Time (JiT) compiler

Question 9

Which of the following are examples of app components available in Android core libraries (choose all that apply):

Service

Stamped Locks

Content

Provider

Phasers

Activity

Threads

Question 10

Which of the following are benefits of the Android Native Development Kit (NDK) (choose all that apply):

It can help integrate existing C/C++ libraries into Android apps

It provides a managed runtime environment for executing Java garbage collection efficiently

It can help improve portability across heterogeneous Java platforms

It can help enhance performance by minimizing latency and maximizing throughput