ITECH1102 Networking and Security: Cloud and Mobile Computing Problems

This document provides detailed solutions to a problem sheet covering cloud services and mobile networks. It addresses topics such as cloud storage services (OneDrive, Dropbox, Google Drive, iCloud), virtualization software, cloud service models (SaaS, IaaS, PaaS), and differences between Type 1 and Type 2 virtualization. The solutions also cover mobile network technologies, including the evolution from analog to digital, switching technologies from 1G to 4G, and the roles of cell towers, base stations, and mobile switching centers. Multiplexing techniques like TDMA, FDMA, and CDMA are defined and explained. Desklib offers a platform for students to access this document and numerous other solved assignments and past papers to support their studies.

Faculty of Science & Technology
Topic 8: Cloud & Mobile problem sheet
Cloud services
Q. The word cloud in the term “Cloud computing” could arguably be replaced with the word
Server computing can be called.
Q. Numerous organisations provide Cloud Storage Services to the domestic market. The name of
some such services are:
 OneDrive : provided by Microsoft and 7GB free storage for new users
 Dropbox : operated by American company Dropbox inc. and 2gb of storage for the basic
account.
 Google Drive: provided by Google and 15gb of of free storage is offered
 iCloud : provided by Apple inc. the promo storage is given is of 5gb
For each of them determine the company that hosts the service and the number of Mbytes of
storage that is available for free. (Use the Internet as required).
Q. What virtualization software is used at Fed Uni. to host guest server operating systems?
Adobe connect is used in the Fed Uni to host the guest server OS
Q. There are three ways to describe hosted cloud services: SaaS, IaaS & PaaS.
Give one example of type of service.
example os SaaS: Amazon EC2, Windows Azure, RackSpace, Gogle Compute engine.
example os IaaS : Amazon Web Services, linode, DIgitalOcean
example os PaaS : AWS Elastic Beanstalk, Windows Azure, Heroku, Force.com, Google App
Engine
Q. Describe the differences between type 1 and type 2 Virtualization.
Type 2 is the first virtualization techniques that has developed. It is designed to run on existing
OS. The advantage of type 2 is it not require any special hardware to run.
The Type 1 virtualization, the operating system and any virtual machines run through the same
hypervisor. This makes it faster than type 2
Q. What is another name given to Type 1 virtualization systems?
The another name of Type 1 vitualization is the Hypervisor.
Mobile networks
Q. The first generation of mobile phones used Analog technologies and only supported voice.
CRICOS Provider No. 00103D Page 1 of 3

Faculty of Science & Technology
Select the correct answer from the following:
 Digital
 Analog
Q. The switching technologies used for mobile communications has changed throughout the
mobile phone technologies 1G through to 4G.
Describe the changes that have occurred.
1g was analog that did not do data
2g was digial and voice supported and it adds dedicated digital data
3g is digital that support data but it is still circuit switched faster than the 2g network.
4g is a type of wireless broadband. architecture of 4g is flat and it uses the packet switching.
The speed is faster than all the previous one.
Q. Describe the roles of the following elements of the mobile phone network:
 Cell : through the cell the calls are made I the mobile phone.
 Base station : A base station is a fixed point of communication for
customer cellular phones on a carrier network
 Mobile switching centre: Associated with the switching function like the setup of call,
release and routing.
Q. Describe the roles of the Base station and the Mobile switching centre as a mobile phone
moves from one cell to another.
The role of the based station is to fix a commiuni cation for the customers mobile phones on
any network.
When move to another cell the mobile switching centre switch the network the cell establishes
the call and do some routing on the network.
Q. Three common multiplexing techniques used for communication between mobile devices and
Base stations are:
 TDMA : TDMA stands for time division multiple access that is a technology which is used in
the digital cellular mobile communication that divides the each of the cellular channels into
the three time slots to increase the amount of the data that will be carried.
 FDMA : FDMA stands for the frequency division multiple access which is the division of the
frequency band that is allocated for the wireless cellular mobile communication into the 30
channels, each of the channels, which can carry the voice conversation or, with the digital
service, digital data. The FDMA is also used for Total Access Communication System (TACS).
 CDMA : Code Division Multiple Access or the CDMA is a type of multiplexing whichfacilitates
different signals to occupy a transmission channel that is single. It optimizes the use of
bandwidth that is available. The technology is mainly used in the ultra-high-frequency (UHF)
cellular mobile systems, bands are ranged between the 800-MHz and 1.9-GHz.
Define each acronym.
CRICOS Provider No. 00103D Page 2 of 3

Faculty of Science & Technology
Briefly describe how each technology works. 2 paragraphs each will suffice.
CRICOS Provider No. 00103D Page 3 of 3