Interview Questions.

Question 1. What Is Blackberry Technology?

Answer :

BlackBerry is not anything but a hand-held wireless device that is just like a  manner pager.
It supports the capabilities like cellular smartphone, push e mail, textual content messaging, web browsing, net faxing.
In addition to those, all varieties of wi-fi records services and multi-contact interfaces also are protected.
Question 2. Explain About Blackberry Operating System?

Answer :

Research in Motion, a Canadian enterprise provided a proprietary working system for BlackBerry.
The working system offers guide for Java MIDP 1.0 and WAP 1.2.
The contemporary model supports Novell Group Wise and Lotus Notes.
Third-birthday party software program can be advanced the use of BlackBerry APIs as well, with sure limit capability must be signed by way of RIM digitally, so that it can be related to a developer account.
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Question 3. Explain About Blackberry Enterprise Server?

Answer :

BlackBerry Enterprise Server: The BlackBerry handhelds are incorporated into the email machine of the corporation thru software BlackBerry Enterprise Server. The BES versions are to be had for MS Exchange, Novell GroupWise and Lotus Domino. A connector was made with the aid of Google for BES for making BES available for Google Apps. A new feature is added which permits to music the present day place of an person through trailateration.
BES provides handhelds with the connectivity of TCP/IP which may be accessed thru a aspect referred to as "Mobile Data Service – Connection Service – MDS-CS". This allows the improvement of custom application development the use of records streams on BlackBerry gadgets which are based at the Sun JME platform.
BES also affords community safety in the shape of Triple DES or AES encryption widespread of all data consisting of e-mail and MDS site visitors, which travels among the BlackBerry hand held gadgets and a BES.
Question 4. Explain About Blackberry Internet Service?

Answer :

The number one alternative to BlackBerry Enterprise Server is BlackBerry Internet Service. The improvement of this carrier is aimed toward the average patron in preference to for the enterprise patron. POP3 and IMAP integration are allowed via these services for the personal user. It allows upto 10 electronic mail debts could be accessed together with popular emails Gmail, Hotmail, Yahoo and AOL. MySpace, Facebook and MSN also can be accessed by using using special bundles.

Latest BlackBerry gadgets are using proprietary BlackBerry Messenger for sending and receiving immediately messages thru BlackBerry PIN or barcode test. This is a BlackBerry Alliance software for the companions who paintings below contract with RIM for creating new BlackBerry packages.

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Question 5. Explain How Synchronization Takes Place With Blackberry Technology?

Answer :

The hand-held tool is used as a network tool, which constantly connected to the facts account of the user thru redirector software. The software is hooked up at the BlackBerry Enterprise Server. The communique between the software program, BE Server and the handheld tool’s software is always a -way avenue. BES without delay updates the mobile tool or the e-mail or the calendar account, on every occasion a alternate in e mail account takes place.The push generation of BlackBerry keeps the device instantly in “synch” with none effort through the consumer.

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Question 6. What Are The Features Of Blackberry?

Answer :

The general functions of a BlackBerry are calendar, notes, calculator, duties, alarm clock and few video games.
In addition to the same old functions, BlackBerry also has a function for downloading third party programs.
Most of the BlackBerry handhelds are capable of using Bluetooth, which lets in for the usage of wireless Bluetooth headsets for handling cellphone calls.
Question 7. What Are The Benefits For Organizations And It Departments By Using Blackberry?

Answer :

Benefits for agencies
The BlackBerry Connect generation allows the corporations for standardizing BlackBerry platform and leverages their current BlackBerry solution investments. The personnel productiveness and performance also can be boosted by supplying them the mobile get right of entry to for their emails and calendars.

Benefits for IT
IT departments are supplied with an answer that is straightforward to make use of, manipulate and install by using using BlackBerry Connect technology. Strict requirements for safety and manageability might be satisfied and numerous gadgets can be related to the BlackBerry Platform.

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Question 8. What Are The Advantages Of Blackberry Technology?

Answer :

1. Email: BlackBerry gives email accessing facility with its wi-fi extension. Normal e-mail sports can be executed without hassles. It stays constantly related to the wi-fi network which enables the user to access e-mail. The mail will seem at the device without retrieving it.

2. Phone: The BlackBerry hand held has all the functions of a cell. In addition it has digital walkie-talkie, SIP based IP telephony and also affords headsets with comfort, readability and comfort.

3. Wireless Internet: The hand held telephone have special functions which allows to browse the internet by means of clicking and scroll track wheel for navigating the pages and brands the URLs through the use of QWERTY keyboards.

4. Tethered Modem: Some of the BlackBerry handheld devices are available with functions like fast wi-fi services with speedy electronic mail and surfing reviews. This tool acts as a tethered modem with out sporting a wi-fi PC card.

5. Organizer: The mobile is provided with capability concerning everyday activities.

6. SMS: Blackberry gadgets aid the power of sending and receiving textual content messages.

7. Instant Messaging: This characteristic enables the consumer for contacting humans as soon as they're linked to the wireless community.

8. Corporate Data Access: Business dreams can be finished with get admission to to the corporate information, by means of using wireless connectivity technology.

Nine. Paging: Some of the BlackBerry fashions provide paging services to the BlackBerry customers who do now not have an e-mail account.

Question 9. What Are The Features Of Blackberry Storm2?

Answer :

The BlackBerry Storm2 has the subsequent functions:

More reminiscence , up to 32GB micro SD card.
Three.2 MP camera with Wi-Fi.
Major trade - Mechanical Button keyboard substitute with completely digital key board – display screen will now not be shifted at the same time as typing.
Support for full-width keyboard whilst in landscape mode.
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Question 10. What Is Iphone?

Answer :

iPhone is a combination of internet and multimedia enabled clever smartphone evolved through Apple Inc.
IPhone capabilities as a digicam phone, including text messaging, and visual voice mail.
IPhone is a transportable media participant that resembles a video iPod.
It has consumer interface this is constructed around the multi-touch display such as virtual keyboard.
App Store, which launched in the mid 2008 has over 1,00,000 packages with functionalities which include video games, references, GPS navigation, advertising, tv shows, movies, reference, celebrities.
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Question 11. What Are The Features Of Iphone 3gs?

Answer :

Video: Videos can be edited, shared. High first-rate VGA video may be shot in portrait or panorama.

3 Megapixel Camera: Still photographs with more pleasant can be taken Voice manage: It acknowledges the names in contacts and recognizes the track on iPod.

Compass: iPhone 3GS has integrated virtual compass, used to factor the way.

Internet Tethering: Internet browsing can be carried out from everywhere. A 3G connection may be shared on Iphone with Mac notebook or pc.

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Question 12. What Is Iphone Os?

Answer :

iPhone OS runs on iPhone and iPod touch devices.

Hardware gadgets are managed through iPhone OS and gives the technology wanted for implementing native packages at the smartphone.

The OS ships with several device packages including Mail, Safari, Phone, which offer wellknown offerings to the person.

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Question 13. What Is Iphone Sdk?

Answer :

iPhone SDK is available with tools and interfaces wished for developing, putting in and going for walks custom native programs.

Native applications are constructed the usage of the iPhone OS device frameworks and Objective-C language and run without delay on iPhone OS.

Native packages are established bodily on a tool and can run in presence or absence of community connection.

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Question 14. What Is Iphone Architecture?

Answer :

It is much like MacOS X structure.
It acts as an middleman between the iPhone and iPod hardware an the performing programs on the display.
The user created packages never have interaction at once with the perfect drivers, which protects the person applications from modifications to the hardware.
Question 15. What Is Iphone Reference Library?

Answer :

iPhone reference library is a fixed of reference files for iPhone OS .
It may be downloaded through subscribing to the iPhone OS Library document set.
Select Help>Documentation from Xcode, and click the subscribe button subsequent to the iPhone OS Library doc set, which appears inside the left column. 
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Question sixteen. What Are Sensors In Iphone?

Answer :

The proximity sensor immediately turns off the show when the iPhone is lifted to ear. With this sensor the power is saved and unintended dialing is avoided.

The display is automatically brightens the iPhone with the aid of the ambient light sensor when the sunlight or shiny rooms and dims in darker places.

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Question 17. What Are The Location Services?

Answer :

Applications including Maps, digital camera and compass are allowed to apply the records from cellular, Wi-Fi and Global Positioning System networks for figuring out the approximate locations.
The location is displayed on the display, using a blue marker.
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Question 18. Describe The Functionality Of Accelerometer Of An Iphone?

Answer :

iPhone responds to movement the use of a integrated accelerometer.

The accelerometer detects the motion and adjustments the display for that reason, on the time of rotating iPhone from portrait to landscape.

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Question 19. Explain About The Applications That Can Be Used With Iphone?

Answer :

Technology, Entertainment and Design(TED): Allows to observe and listen to global’s most captivating human beings have to say, all on the iPhone.
Market Watch: Breaking information approximately the investments may be seen. To achieve this, open the Stocks app and rotate.
Trends: Latest runway shows, films from Vogue’s style library, evaluations, specific celebration photographs, style information updates may be seen on Style.Com. 

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Question 20. Explain About The Cpu Used In Blackberry Technology?

Answer :

Early BlackBerry gadgets used Intel-80386 processors but Intel XScale 624 MHz CPUs are used inside the cutting-edge BlackBerry 9000 collection.
Earlier, BlackBerry 8000 collection with Pearl turned into based totally on the 312 MHz ARM XScale ARMv5TE PAXA900. BlackBerry 8707 turned into primarily based on 80 MHz Qualcomm 3250 chipset, and the tool changed into frequently slower for downloading and render the internet pages over 3G than the 8700 turned into over EDGE networks.

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Question 21. What Is The Domain Name System (dns)? What Are The Advantages Of It?

Answer :

A hierarchial naming system for laptop structures, offerings or for that matter any useful resource collaborating within the net. Various records with domain names is assigned to each of the contributors. DNS translates the names of area into significant to humans into binary identifiers that are associated with the device of community to locate and cope with these devices. 
Advantages:
More Reliable: Delivers messages to the customers with zero downtime.
Faster: DNS are linked properly at intersections of internet. Any forged technology enables requests are replied to the following closest node within the case of preservation or downtime.
Smarter: Automatic corrections of sorts.

Question 22. What Is The Ttl (time To Live)? Why Is It Required?

Answer :

TTL is a cost in information packet of Internet Protocol. It communicates to the community router whether or not or now not the packet ought to be in the network for too long or discarded. Usually, records packets might not be transmitted to their supposed destination inside a stipulated period of time. The TTL value is about via a system default fee that's an 8-bit binary digit field in the header of the packet. The motive of TTL is, it'd specify certain time restriction in seconds, for transmitting the packet header. When the time is exhausted, the packet could be discarded. Each router receives the subtracts rely, when the packet is discarded, and while it turns into zero, the router detects the discarded packets and sends a message, Internet Control Message Protocol message again to the originating host.

Question 23. Explain The Use Of Internet Control Message Protocol (icmp)?

Answer :

Internet Control Message Protocol is one of the crucial protocols in the Internet Protocol suite. It is in particular utilized in operating system of networked computer systems, for the cause of sending error messages, for instance, a requested service is unavailable or the host couldn't be reached. It is not directed with the aid of the network packages. ICMPs are utilized by routers, hosts for communicating the updates or errors records to different routers.

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Question 24. What Is The Use Of Igmp Protocol?

Answer :

Internet Group Management Protocol:  It permits internet hosts to participate in multicasting. The IGMP messages are used to analyze which hosts is part of which multicast companies. The mechanism also permit a bunch to tell its local router, that it desires to receive messages.

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Question 25. What Are Ping And Tracert?

Answer :

Ping and tracert are the instructions used to send facts to some far flung computer systems to get hold of a few information. Information is sent and obtained by using packets. Ping I mainly used to test if the machine is in network or now not. It also offers packet lost data. In home windows ping command is written as ping ip_address Tracert is called as hint route. It is used to tune or hint the direction the packet takes from the laptop wherein the command is given until the destination. In windows ping command is written as tracert ip_address

Question 26. Explain Rsvp. How Does It Work?

Answer :

Resource Reservation protocol is used to order resources throughout a network. It is used for requesting a selected Quality of Service (QoS) from the community. This is done by way of carrying the request (that needs a reservation of the resource) of the host throughout the community. It visits each node within the network. RSVP used two nearby modules for reservation of sources. Admission manage module confirms if there are enough to be had sources even as coverage module tests for the permission of creating a reservation. RSVP gives scalability. On a a hit finishing touch of both assessments RSVP uses the packet classifier and packet scheduler for the favored Qos requested.

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Question 27. Explain The Concept Of Dhcp?

Answer :

Dynamic Host Configuration Protocol is used assigning IP addresses to computer systems in a community. The IP addresses are assigned dynamically. Certainly, the use of DHCP, the pc can have a unique IP deal with on every occasion it's miles linked to the community. In a few instances the IP address may also alternate even when the laptop is in community. This approach that DHCP rentals out the IP deal with to the laptop for someday. Clear benefit of DHCP is that the software program may be used to manage IP address in place of the administrator.

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Question 28. What Are The Differences Between A Domain And A Workgroup?

Answer :

In a domain, one or extra computer may be a server to manipulate the network. On the opposite hand in a workgroup all computer systems are friends having no manage on each other. In a domain, user doesn’t want an account to logon on a particular laptop if an account is available on the domain. In a piece organization person wishes to have an account for each laptop.

In a domain, Computers may be on specific local networks. In a work group all computers wishes to be a part of the equal local network.

Question 29. Explain How Nat Works?

Answer :

Network Address Translation translates and IP cope with utilized in a community to some other IP deal with regarded within some other network. A NAT desk is maintained for global to nearby and neighborhood to mapping of IP’s. NAT may be statically described or dynamically translate from a pool of addresses. The NAT router is liable for translating visitors coming and leaving the network. NAT prevents malicious hobby initiated by means of outside hosts from reaching neighborhood hosts by means of being depending on a device on the neighborhood network to provoke any connection to hosts on the other aspect of the router.

Question 30. What Is Ppp Protocol? Explain Ppp Packet Format.?

Answer :

Point to Point protocol helps communication between 2 computer systems over a serial cable, phone line or other fiber optic traces. E.G. Connection between an Internet Service Provider and a host. PPP additionally provides authentication. PPP operates by using sending Request packets and watching for Acknowledge packets that receive, reject or attempt to alternate the request. The protocol is likewise used to negotiate on community cope with or compression options between the nodes.
Packet layout:-
Flag area: 1 byte: - Indicates frames beginning or give up
Address field: 1 byte: - Used for broadcast address (vacation spot deal with)
Control discipline: 1 byte: - Used as a manipulate byte
Protocol discipline: - 1 or 2 bytes: - Setting of protocol in data field (of datagram)
Information: - zero or greater bytes: - Datagram (whether or not it contains facts or manipulate data)
Padding: - 0 or extra bytes: - non-compulsory padding
FCS: - 2 or greater bytes: - blunders check sum

Question 31. What Is Ip Spoofing And How Can It Be Prevented?

Answer :

IP spoofing is a mechanism used by attackers to benefit unauthorized get entry to to a machine. Here, the intruder sends messages to a computer with an IP address indicating that the message is coming from a trusted host. This is performed by means of forging the header so it incorporates a extraordinary address and make it seem that the packet changed into sent by using a unique system.
Prevention:-
Packet filtering: - to permit packets with identified formats to go into the network Using unique routers and firewalls. Encrypting the session.

Question 32. Explain Ip Datagram, Fragmentation And Mtu?

Answer :

IP datagram may be used to describe a part of IP statistics. Each IP datagram has set of fields organized in an order. The order is unique which facilitates to decode and study the move without problems. IP datagram has fields like Version, header period, Type of provider, Total duration, checksum, flag, protocol, Time to stay, Identification, supply and destination ip deal with, padding, alternatives and payload.
MTU Maximum Transmission Unit is the scale of the largest packet that a communication protocol can pass. The length may be fixed by some widespread or decided at the time of connection
Fragmentation is a system of breaking the IP packets into smaller pieces. Fragmentation is needed while the datagram is greater than the MTU. Each fragment becomes a datagram in itself and transmitted independently from source. When acquired by using destination they're reassembled.

Question 33. What Is An Application Gateway?

Answer :

An software gateway is an application software that runs on a firewall among two networks. An utility gateway is used for organising connection among patron application and destination service. The patron negotiates with the gateway to talk with the service of destination. Here, gateway can be called as a proxy. Hence, two connections are made. One between purchaser and proxy; other, among proxy and vacation spot carrier. Connections take place in the back of the firewall.

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Question 34. Explain Circuit Level Gateway?

Answer :

A circuit level gateway is used to discover if a consultation in TCP handshaking is valid or now not. It can be considered as a layer between software layer and shipping layer. They shield the data of the personal community they guard. Circuit stage gateways do now not filter packets.

Question 35. What Is 'gateway Of Last Resort'?

Answer :

A Gateway of Last Resort or Default gateway is a course used by the router whilst no different known course exists to transmit the IP packet Known routes are gift inside the routing desk. Hence, any course not recognised by means of the routing desk is forwarded to the default path. Each router which gets this packet will treat the packet the same way, if the course is thought, packet may be forwarded to the regarded route.

Question 36. What Are Switches? Explain The Concepts Of Layer-3 Switches?

Answer :

It is a device that connects multiple community segments.
A switch analyzes the MAC deal with after which determines in which to send the information.
So a file addressed to a laptop reaches most effective that laptop thru using a switch.
The time period ‘transfer’ normally refers to a Network bridge that processes and routes facts at the Data link layer (layer 2) of the OSI model.
Switches that additionally method statistics on the Network Layer are frequently known as Layer three switches or Multilayer switches.
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Question 37. What Is Router? Explain Components Of Routers.

Answer :

The way switches join more than one computer systems, a router connects a couple of networks. Routers include of statistics which includes big tables of networks and addresses. Routers use algorithms to decide the shortest path to an deal with in a community.

Question 38. Which Os Versions Does Blackberry App World Support?

Answer :

BlackBerry App World works with BlackBerry smartphones going for walks OS version 4.Five.Zero or higher.

Question 39. Can We Distribute Web Applications?

Answer :

Yes, it’s possible to promote and distribute web-based totally content services for BlackBerry smartphones, furnished you offer an internet icon utility to be distributed on BlackBerry App World.
A internet icon utility is a small Java software packaged as a COD file that, as soon as downloaded, presents a devoted icon on the BlackBerry telephone with a purpose to take the user to a mobile website.

Question 40. Can We Distribute My Web Signals Application?

Answer :

Yes, it’s possible to sell and distribute internet alerts-based totally content services, supplied you offer a web sign registration utility to be dispensed thru BlackBerry App World.
A web sign registration utility is a small Java software packaged as a cod document that, as soon as downloaded, affords the person with the option to release the net browser to your net signal registration page. Upon signing up on your internet sign carrier, the web sign registration application may be removed by way of the quit consumer.

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Question 41. Can We Distribute Themes?

Answer :

Yes, themes may be distributed on BlackBerry App World.

Question forty two. Can We Distribute Blackberry Webworks Applications?

Answer :

Yes, BlackBerry WebWorks applications can be allotted on BlackBerry App World.

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Question 43. Can We Distribute Applications That Use Cryptographic Apis?

Answer :

You can distribute programs that use cryptographic APIs provided they adhere to the requirements and restrictions particular within the BlackBerry App World Vendor Agreement.
You may also be required to offer a Commodity Classification Automated Tracking System (CCATS) reference for Research In Motion (RIM) to attain additional data on the application and make certain compliance with export control policies.

Question 44. How Are Applications Categorized?

Answer :

Categories may be decided on for the duration of the software submission procedure. Vendors can pick one class that applies to an application. All category picks can be reviewed and are problem to change.

Question 45. What Do I Need To Submit An Application?

Answer :

You’ll want to offer the following statistics whilst filing an utility:

Application name
Category
Application language
Description language
Description
Icon (480x480 png image)
Screenshots
License type
Price
OS model supported
Question forty six. What Are The Requirements For The Icon And Screenshots?

Answer :

The document submitted for the icon is automatically sized to be used in numerous elements of the BlackBerry App World solution. It’s advocated you offer a 480x480, 300dpi, RGB report in PNG format so the icon retains the excellent possible image fine while the file is transformed.

Question 47. What Billing Models Are Supported On Blackberry App World?

Answer :

BlackBerry App World supports one-time billing at the time of download, free programs and the sale of virtual goods inside programs.

Question forty eight. Can We Select More Than One Category For My Application?

Answer :

You can pick simplest one category on your utility. Category choice may be evaluated for suitability and an exchange category may be cautioned on your software.

Question 49. What Languages Does Blackberry App World Support?

Answer :

The BlackBerry App World patron supports English, French, Italian, German, Spanish and Brazilian Portuguese. Additional languages could be added in destiny releases.

Question 50. Is There A Blackberry Forum For End Users And Vendors?

Answer :

BlackBerry App World boards for companies and give up users are energetic on the BlackBerry forums.

Question fifty one. Who Can Submit Applications Through The Blackberry App World Vendor Portal?

Answer :

Most developers from round the world can publish packages for BlackBerry App World.

Question 52. How Does Rim Determine If An Application Is Suitable For Blackberry App World?

Answer :

RIM will evaluate a submitted application for content material suitability and perform technical trying out to make certain the software meets the BlackBerry App World Vendor Guidelines.
Vendors must take a look at their programs for compatibility against the devices selected at some stage in the submission system to keep away from take a look at disasters and alertness rejections.