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Computer Interview Questions Answers

BlueTooth Interview Questions Answers

Question - 1 : - How secure a Bluetooth device is?

Answer - 1 : - Bluetooth uses the SAFER+ algorithm for authentication and key generation. The E0 stream cipher is used for encrypting packets. This makes eavesdropping on Bluetooth-enabled devices more difficult.

Question - 2 : - What is Airport?

Answer - 2 : - Airport is a wireless communications system, like Bluetooth. It is based on the IEEE 802.11 recommendation. It also uses 2.4 GHz frequency band, but its range is about 45 meters and it boasts a transmission speed of 11 Mbit/second. It is developed by Lucent Technologies.

Question - 3 : - What are Different Classes in Bluetooth?

Answer - 3 : - Bluetooth is a radio standard and communications protocol primarily designed for low power consumption, with a short range (power class dependent: 1 meter, 10 meters, 100 meters) based around low-cost transceiver microchip in each device. Bluetooth lets these devices communicate with each other when they are in range. The devices use a radio communications system, so they do not have to be in line of sight of each other, and can even be in other rooms, so long as the received power is high enough.

Question - 4 : - What is Piconet?

Answer - 4 : - A collection of devices connected through Bluetooth technology in an ad hoc fashion.

Question - 5 : - How many devices can communicate concurrently?

Answer - 5 : - A Bluetooth device playing the role of the “master” can communicate with up to 7 devices playing the role of the “slave”. This network of “group of up to 8 devices” (1 master + 7 slaves) is called a piconet. A piconet is an ad-hoc computer network of devices using Bluetooth technology protocols to allow one master device to interconnect with up to seven active slave devices (because a three-bit MAC address is used). Up to 255 further slave devices can be inactive, or parked, which the master device can bring into active status at any time.

Question - 6 : - Which technology is used in Bluetooth for avoiding interference?

Answer - 6 : - Frequency hopping is the technology used in Bluetooth.

Question - 7 : - Give a generic description of Bluetooth?

Answer - 7 : - Bluetooth is a low-cost, short-range (RF) links between mobile PCs, mobile phones and other portable devices. Bluetooth can transmit through solid, non-metal objects.

Question - 8 : - What are the other (competing or not) wireless technologies?

Answer - 8 : - Wi-Fi, IrDa, EDGE, UWB (Ultra Wide Band)

Question - 9 : - What are the problems with older versions (1.0 and 1.0 B)?

Answer - 9 : - Versions 1.0 and 1.0 B had numerous problems and the various manufacturers had great difficulties in making their products interoperable. 1.0 and 1.0B also had mandatory Bluetooth Hardware Device Address (BD_ADDR) transmission in the handshaking process, rendering anonymity impossible at a protocol level, which was a major setback for services planned to be used in Bluetooth environments, such as Consumerism.

Question - 10 : - How many SCO links are there in a piconet?

Answer - 10 : - In a piconet, there can be up to three SCO links of 64,000 bits per second each.

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