Wireless Testing Interview Questions & Answers

Question 1. How Are The Difficulties Involved With Testing Of Mobile And Cellular Handsets Overcome By Testers?

Answer :

The most common and important difficulties that should be overcome by testers is testing on multiple types of handsets and automation testing.

Question 2. How Can You Overcome The Difficulties Involved With Testing Of Mobile And Cellular Handsets?

Answer :

As a tester you need to make yourself more aware of the automation services/tools to run tests on mobiles handsets.

A smart mobile simulation program is hooked on to the actual (physical) handset at 'device anywhere' site. Companies pay per use or a monthly fee. The UI is like that of a mobile simulator, but the tests run on a phone.

The beauty lies in the variety of mobile phones they offer. I'm no way connected to device anywhere company but I'm a customer who is benefiting from their service.

Question 3. Explain What Technologies Are Used With Wireless Testing?

Answer :

The technology used will determine the type of test environment and tools that we need.

• WAP.
• Bluetooth, etc..
• XML, WML.
• Security protocols.

Tools: 

• WAP Simulators by hardware vendor: Nokia, Ericsson, Motorola.
• Capture/Playback - such as TestPartner by Compuware.
• Performance Testing - such as QA Load Compuware.

Question 4. What Is Wireless Test Executive?

Answer :

Wireless test executive is an easy-to-use graphic interface for controlling test selection, execution, and runtime options. Tests are displayed in a hierarchical list where each entry represents one test.Test Objects are a key component of the Test Executive Architecture.The Test Objects operate with the Test Executive through a standard interface that is provided by the Test Executive DLL.

Question 5. Explain What Is The Term Load In Wireless Testing?

Answer :

Its giving enough load to the process. Suppose a user using the wireles interface for communication, which it is many-many communicator.

• Check the interface behaves once another communicator is in request(make a call to a interface, which is busy in communcating with another interface).
• Check the Wireless interface performance on invoking the another application( Reminder, Alaram invoked on call, Message received, low battery ect..)

Question 6. What Are The Different Levels In Wireless Testing?

Answer :

Levels of testing:

1. Usability Testing
2. Network Performance Testing
3. Server-Side Testing
4. Automating Unit Testing

Question 7. Explain How Is Quality Of Wireless Testing Measured?

Answer :

The quality of a wireless signal is measured with respect to thresholds of:

• BER (Bit Error Rate) which should be < 10^-6 or BLER (Block Error Rate)
• RSSI (Received Signal Strength Indicator)
• SWR (Standing Wave Ratio)
• SNR (Signal-to-Noise Ratio) which is P/N
• SINR (Signal to Interferance and Noise Ratio) or P/(N+I)
• SINADR (Signal-to-Interference plus Noise And Distortion Ratio).. and many more.

These parameters are evaluated based on the technology or standard in use. For example, in WiFI or 802.11, the RSSI is used as the link quality parameter to be used. However, all of the above contribute in one way or the other to the quality of the wireless link as noise, interference, environmental characteristics, power, frequency used... contribute to the loss or gain in the link's quality.

Question 8. Explain Requirement Of Simulators?

Answer :

Best way to test network apps to test connectivity.

Question 9. Build Installation Medium?

Answer :

Wireless (OTA/WiFi/BT) wired: using Data Cable, PC Suit.

Question 10. Builds For Devices?

Answer :

sort out builds on basis of :

• make (Brand) due to their specific key functionalities.
• resolutions 128x128, 240x320, 176x220 (208), 320x240 or higher resolution.

Question 11. Find Out What To Test? Is The Application In Stand Alone Or Client Server?

Answer :

If application is clent server - you need wifi (if Device support) and GPRS (device should be enbled and GPRS Access Points should be configured according to requirement).

For CDMA there is no need to set access point. And devices should be according to service operators.

Question 12. How Is Test Environment Prepared For Wireless Testing?

Answer :

There are wireless simulators to which you connect ur mobile and test. Simulator acts like wireless tower in real network

Question 13. Is There Any Automation Tool For Mobile(wireless) Application Testing?

Answer :

• TestQuest and MTS are two mobile automation tools. 
• TestQuest is used to test wireless handsets.
• MTS is a scalable automated application testing tool for Windows Mobile 5.0.
• There are also ways to produce automated tests on various mobile browsers with wireless handset simulation tools such as OpenWave.

Question 14. Explain What Is Wireless Testing? How Do We Do It? What Are The Concepts A Test Engineer Should Have Knowledge Of? How Do U Classify Testing Of Wireless Products?

Answer :

Wireless testing you can classify into 3 types:

1. Platform testing: To do this testing, tester should have programming knowledge of cpp, java
2. Protocol testing: To do this, tester should have a knowledge of Networking concepts like, making lan connections, read protocol logs in wireshark, ethereal (both are protocol logging tools), all protocol definitions TCP/IP, UDP.. etc etc
3. Application testing: Testing mobile application is almost testing windows applications but bit different. Some basic networking concepts are must. If the application is to be testing in JUnit, then Java knowledge is a must.

Question 15. Explain How Must The Testers Update Themselves And What All Must Be Learn By Testers To Perform Wireless Testing?

Answer :

1. Should know the Functional units for new technology.
2. Tester should know the latest Mobile technology knowledge.
3. Should know about the Test Environment.
4. Should able to configure and troubleshoot the device.
5. Should able to follow the standards and verify the checklist.
6. Should be innovative thinking and make Test scenario for the running the application.
7. Should able to Test the full part of coverage.

Question 16. What Are The Prerequisites To Become A Mobile Tester?

Answer :

Mobile Tester Should know about the

1. Mobile Technology
2. Development Technology
3. Mobile Platform(OS)
4. Knowledge on Device Supporting Tools.
5. Mobile Protocols

Question 17. How To Test Protocols In Mobile Testing. And How Many Protocols Are Used In Mobile Application?

Answer :

Actually the same TCP/IP concepts go in mobile apps also, but when it comes down to browsing apps/downloading apps, it is generally done via WAP gateway (Not WAP Server which generally people confuse with). WAP is a standard defined to serve as a common platform as we cannot directly hook on from normal TCP/IP network to a mobile network. But it is definitely possible to call, SMS, sending mail from any browser to a mobile device, and vice versa. 

Question 18. Explain Difference Between 2g And 3g In Mobile Phone Testing?

Answer :

2G and 3 G is a family of standards for mobile telecommunications defined by the International Telecommunication Union,which includes GSM EDGE, UMTS, and CDMA2000 as well as DECT and WiMAX. Services include wide-area wireless voice telephone, video calls, and wireless data, all in a mobile environment.

2G Stands for second generation mobile telephony standards, where 3G defined the third generation mobile telephony standards to facilitate growth, increase bandwidth, and support more diverse applications.For example, GSM (the current most popular cellular phone standard) could deliver not only voice, but also circuit-switched data at download rates up to 14.4 kbps. But to support mobile multimedia applications, 3G had to deliver packet-switched data with better spectral efficiency, at far greater bandwidths.

Question 19. What Areas Of Applications Can Be Covered Under Wireless Testing?

Answer :

Basically Call module should be covered for wireless testing, after that all the applications should be tested how those applications behave when a call is received being in that application.

Question 20. Explain How Are The Security Aspects Taken Care While Performing Wireless Testing In A Wireless Network?

Answer :

we must consider the following aspect:

1. Unauthorised access/Guest access
2. Firewalls
3. Concurrent connections

Question 21. How To Get Voice Over Wireless Testing?

Answer :

There are testlabs to test the voice over wireless testing. Otherwise you can use two of ur test mobiles and can put any operators simcard just like ur own mobile and can test it. Most of the companies provide some operators simcards to test.

Question 22. How We Test Battery Back Up Time Using Load Testing?specially For Mobile Testing?

Answer :

procedure of battery testing :

battery backup test for idle mode:

• fully charge the battery
• make sure no calls should be made on DuT
• start timer when fully charget
• wait until the battery drain out fully 

battery backup test for dedicated mode:

• again fully charge the battery 
• make a call to a test phone from DuT
• start timer when call is connected
• wait untill the battery is fully drain out 
• match all the readings from user manual and check the battery leakage

Question 23. Abbreviate Tls And Ttls?

Answer :

• TLS: Transport Layer Security
• TTLS: Tunneled Transport Layer Security

Question 24. Abbreviate Wep And Tkip?

Answer :

• WEP: Wired Equivalent Privacy
• TKIP: Temporal Key Integrity Protocol

Question 25. How Can We Utilize Racal In Mobile Testing?

Answer :

RACAL is Base station emulator, using this we can test all mobile use cases in the controlled environment.

Question 26. How Is Wireless Network Adapters Tested?

Answer :

• Check that the Wireless Network Adapter is on and verified by LED glow.
• Check that the Wireless Network Adapter is suited for the different OS.
• Check the Wireless Network Adapter is able to pass Installation Testing.
• Check that the Wireless Network Adapter is able to configure.
• Check the data flows(in/out) functions for the Wireless Network Adapter.
• Check the flow rate of data and should not breakup.
• Check the Time delay taken for every process.
• Data Transmission should not be freeze at any situation.

Question 27. How To Do Tracing In Wireless Testing?

Answer :

1. Wired-side AP fingerprinting
2. Wired side MAC prefix analysis
3. Wireless-side warwalking
4. Wireless-side client monitoring
5. Wireless-side WLAN IDS 

Question 28. Which Areas Of The Application Can Be Covered Under Wireless Testing?

Answer :

Call modules should be tested for wireless testing, after that all the applications should be tested to check how those applications behave when a call is received in that application.

Question 29. What Should The Testers Know To Able To Perform Wireless Testing Effectively?

Answer :

Testers must be able to think lot of scenarios relating to calls, for example when a call comes and at the same time alarm rings how the system behaves or say when the mobile is busy with a call at that time one more call comes, how the system behaves etc. There can be a lot of scenarios like this.

Question 30. How Should The Analysis Be Performed By A Tester Before Carrying Out Wireless Testing?

Answer :

White box testing provides the testers with complete knowledge of the infrastructure to be tested, often including network diagrams, source code, and IP addressing information. 

It can be performed to validate whether code implementation follows intended design, to validate implemented security functionality, and to uncover exploitable vulnerabilities.