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BlueTooth Interview Questions Answers

Question 1 : How many devices can communicate concurrently?

Answer 1 : 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 2 : Why is Bluetooth 2.0 better?

Answer 2 : The main features of Bluetooth Core Specification Version 2.0 + EDR are: • 3 times faster transmission speed (up to 10 times in certain cases) • Lower power consumption through reduced duty cycle • Simplification of multi-link scenarios due to more available bandwidth • Backwards compatible to earlier versions • Further improved BER (Bit Error Rate) performance

Question 3 : Which Bluetooth version uses adaptive frequency hopping? Why?

Answer 3 : In Version 1.2 Adaptive frequency hopping method is used, which improves resistance to radio interference, and provides higher transmission speed.

Question 4 : Give a generic description of Bluetooth?

Answer 4 : 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 5 : How many SCO links are there in a piconet?

Answer 5 : In a piconet, there can be up to three SCO links of 64,000 bits per second each.

Question 6 : What is Piconet?

Answer 6 : A collection of devices connected through Bluetooth technology in an ad hoc fashion.

Question 7 : How does Bluetooth use frequency hopping for security?

Answer 7 : Bluetooth picks a random frequency out of 79 and then hops around the range about 1600 times per second.

Question 8 : Which technology is used in Bluetooth for avoiding interference?

Answer 8 : Frequency hopping is the technology used in Bluetooth.

Question 9 : Which method is used for Data transfer?

Answer 9 : Asynchronous Connectionless (ACL) is Data transfer method in Bluetooth

Question 10 : What are the problems with older versions (1.0 and 1.0 B)?

Answer 10 : 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.

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