How can you configure Wi-Fi network and what are Wi-Fi Protocols?

Correct Answer: Advantages of 3G: - Overcrowding is relieved in existing systems with radio spectrum - Bandwidth, security and reliability are more - Provides interoperability among service providers - Availability of fixed and variable rates - Support to devices with backward compatibility with existing networks - Always online devices ? 3G uses IP connectivity which is packet based - Rich multi media services are available Disadvantages of 3G: - The cost of cellular infrastructure , upgrading base stations is very high - Needs different handsets - Roaming and data/voice work together has not yet been implemented - Power consumption is high - Requires closer base stations and are expensive - Spectrum-license costs, network deployment costs and handset subsidies subscribers are tremendous

Correct Answer: The handheld device is used as a network device, which always connected to the data account of the user via redirector software The software is installed on the BlackBerry Enterprise Server The communication between the software, BE Server and the hand held device?s software is always a two-way street BES immediately updates the mobile device or the email or the calendar account, whenever a change in email account occurs The push technology of BlackBerry keeps the device instantly in ?synch? without any effort by the user

Correct Answer: Research in Motion, a Canadian company provided a proprietary operating system for BlackBerry The operating system provides support for Java MIDP 10 and WAP 12 The current version supports Novell Group Wise and Lotus Notes Third-party software can be developed using BlackBerry APIs as well, with certain restriction functionality must be signed by RIM digitally, so that it can be associated to a developer account

Correct Answer: Benefits for organizations : The BlackBerry Connect technology allows the organizations for standardizing BlackBerry platform and leverages their existing BlackBerry solution investments The employees? productivity and performance can also be boosted by providing them the mobile access for their emails and calendars Benefits for IT : IT departments are provided with a solution that is easy to utilize, manage and deploy by using BlackBerry Connect technology Strict requirements for security and manageability will be satisfied and several devices can be connected to the BlackBerry Platform

Correct Answer: BlackBerry is nothing but a handheld wireless device that is just like a two way pager It supports the features like mobile telephone, push e-mail, text messaging, web browsing, internet faxing In addition to these, all types of wireless information services and multi-touch interfaces are also included

Correct Answer: Wi-Fi technology is a technology used for transmitting a signal using the 80211 specifications works a lot like it does with a basic Ethernet hub: They?re both two-way forms of communication, and they both use the same frequency to both transmit and receive, often referred to a half-duplex WLANs used radio frequencies (RFs) that are radiated into the air from an antenna that creates radio waves These waves can be absorbed, refracted, or reflected by walls, water, and metal surfaces, resulting in low signal strength So because of this vulnerability to surrounding environmental factors, it?s pretty apparent that wire-less will never offer us the same robustness as a wired network can, but that still doesn?t mean we?re not going to use or run the wireless or Wi-Fi

Correct Answer: Value type : Stores the data The value of value types is stored on the managed stack They are lighter objects One variable can have only one value Reference Type : Stores the reference to the data A reference type is allocated on the heap They are heavier objects Several variables can reference the same data

Correct Answer: The Net runtime knows about all the references between the objects It can identify all the circular references that are reachable from the root and hence finalize them to free them all at once if and when needed

Correct Answer: Delegates

Explanation:

A delegate declares a ref type that references a named of anonymous method. Delegates are secure and type-safe.

Correct Answer: All the above

Explanation:

All the above listed are debugging windows in .NET