TentMobInfra

Question 1

A factory reset wipes parts of the /system partition.

Answer

true

Question 2

An android service runs by default in a new created thread.

Answer

true

Question 3

An apk-file of an application contains a certificate of the owner.

Answer

true

Question 4

ACTION_BATTERY_LOW  is an explicit Intent

Answer

true

Question 5

An android app can send an implicit intent to another android app

Answer

true

Question 6

Retrofit is a REST-server framework

Answer

true

Question 7

The HTTP protocol has among others the following methods

Accepted Answer

DELETE, PUT, POST

Answer

GET, UPDATE, POST

Answer

PUT, UPDATE, SELECT

Answer

PUT, INSERT, GET

Question 8

Two common formats used to represent data in REST are:

Accepted Answer

a. xml and json

Answer

b. doc and xml

Answer

c. doc and png

Answer

d. doc and json

Question 9

GPS location updates consume significantly more power than network location updates

Answer

true

Question 10

Bluetooth makes use of an ISM-frequency band

Answer

true

Question 11

Each bluetooth device has a 12 bits mac address.

Answer

true

Question 12

The android application framework is written in java.

Answer

true

Question 13

An iBeacon uses the following communication technique:

Accepted Answer

a. Bluetooth

Answer

b. GSM

Answer

c. ANT

Answer

d. Wifi

Question 14

The magnetic field sensor gives 3 values: x, y and z.

Answer

true

Question 15

Bluetooth low energy is part of the bluetooth 4.0 specification

Answer

true

Question 16

When a mobile device is in a steady state (meaning that the mobile is not in motion) the gyroscope sensor values for x, y and z are respectively: 0, 0 and 0.

Answer

true

Question 17

For checking server certificates java uses the cacerts-file

Answer

true

Question 18

With REST it is possible to transfer resource states by means of XML.

Answer

true

Question 19

RESTful systems typically communicate over HTTP

Answer

true

Question 20

JAX-RS is an implementation and not a specification

Answer

true

Question 21

The Servlet doGet method  has two parameters, one of the class HttpServletRequest and one of the class HttpServletResponse

Answer

true

Question 22

In JAX-RS authorisation can be obtained by the annotation @rolesallowed.

Answer

true

Question 23

Tomcat and Glassfish are examples of servlet containers.

Answer

true

Question 24

The X.509 standard is about RSA encryption

Answer

true

Question 25

Within TLS data-integrity is obtained by means of a MAC-code.

Answer

true

Question 26

AES 256 is an asymmetric key encryption technique

Answer

true

Question 27

Within TLS the client and server negotiate during the handshake on a cipher suite

Answer

true

Question 28

When a mobile device is in a steady state (no motion) the 3 values of the accellerometer sensor are all zero (in theory).

Answer

true

Question 29

Describe how digital certificates are signed.

Accepted Answer

First the hash value of the document is calculated and after that the hash value is encrypted with the private key of the (issuing) certificate authority.

Answer

First the public key of the document is calculated and after that the hash value is encrypted with the private key of the (issuing) certificate authority.

Question 30

Describe how the distance between an ibeacon and a receiver (e.g. mobile phone) can be estimated.

Accepted Answer

An ibeacon sends in each pakket a number that is related to the transmitted power of the ibeacon.  To be precise: this number is the signal strength measured by the manufacturer at 1 meter distance  of the ibeacon. Furthermore the receiver (mobile Phone) can measure the received signal strength (at x meters) of the ibeacon-signal. With these two numbers the ibeacon can estimate the distance.

Answer

An ibeacon sends in each pakket a number that is related to the transmitted power of the ibeacon.  To be precise: this number is the signal strength measured by the manufacturer at 5 meter distance  of the ibeacon. Furthermore the receiver (mobile Phone) can measure the received signal strength (at x meters) of the ibeacon-signal. With these two numbers the ibeacon can estimate the distance.

Answer

An ibeacon sends in each pakket a number that is related to the transmitted power of the ibeacon.  To be precise: this number is the signal strength measured by the manufacturer at 15 meter distance  of the ibeacon. Furthermore the receiver (mobile Phone) can measure the received signal strength (at x meters) of the ibeacon-signal. With these two numbers the ibeacon can estimate the distance.

Question 31

The ISM-band are the industrial, scientific and medical (ISM) radio bands

Answer

true

Question 32

Are this the functions of the major and minor fields in an ibeacon pakket?
Major: Group number
Minor: number of beacon within a group

Answer

true

Question 33

Gravity sensor [derived from the accelerometer] is used to determine the device orientation (portrait / landscape)?

Answer

true

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