Computer Network Management — Test 2

Correct Answer: D. D. It is a group of interconnected piconets
Explanation: Scatternet is a network connecting two or more Piconets having Bluetooth technology incorporated in their network devices. It supports communication between more than 8 devices. Thus, Scatternet can also be defined as interconnected Piconets.

Correct Answer: A. A. True
Explanation: Personal Communication Services (PCS) and Digital Cellular Services are the two advanced segments of wireless technology. These segments are important for data communication. Thus they are based on cellular technology and rely on multiple access principle.

Correct Answer: C. C. Directional antenna
Explanation: Directional Antenna helps in increasing the gain of a signal in forward direction or one particular direction. It is also known as beam antenna. It avoids interference of unwanted signals.

Correct Answer: A. A. By hiding nodes in a network
Explanation: In wireless communications, there exists a hidden node problem. This occurs when a node or a station is visible to an Access Point but not to other stations communicating with the Access Point. The main reason behind this is that the stations are out of range of each other and thus collisions cannot be detected.

Correct Answer: D. D. 2.402 ghz, 2.480 ghz
Explanation: The frequency band for Bluetooth communication is set by an international agreement. This frequency band is between 2.402 GHz and 2.480 GHz.

Correct Answer: B. B. Integrated services digital network
Explanation: ISDN in computer networking stands for Integrated Services Digital Network. It enables the transmission of digital data over telephone lines. It is considered as a circuit-switched telephone network system.

Correct Answer: C. C. Narrow band, broadband
Explanation: Narrowband ISDN was implemented to make digital telephone systems more impactful over analog telephone systems. It utilizes narrow band of frequencies. Narrowband is also known as Normal-ISDN. Broadband ISDN on the other hand, is a standard for transmitting voice data on larger frequency bands.

Correct Answer: B. B. False
Explanation: Basic Rate Interface (BRI) and Primary Rate Interface (PRI) are the two types of Integrated Services Digital Network (ISDN). The major difference between them is their reliability. BRI provides less reliability and low services at lower costs compared to PRI.

Correct Answer: A. A. Q.931 protocol
Explanation: ISDN (Integrated Services Digital Network) is a connection oriented network system and uses Q.931 Protocol for managing its call states. Q.931 is a signaling protocol. It can be compared to SIP but SIP is not applicable to ISDN. SIP is a 3GPP signaling protocol. H.323 is a call signaling protocol that was initially implemented in LANs. ICMP is used in routers and helps in sending error messages.

Correct Answer: C. C. Full-duplex
Explanation: ISDN provides a set of standards for maintaining different call states. It is a circuit-switched telephone network system. It acts as an interface, and only a single device can be connected to this interface. This interface is based on full-duplex mode of data transmission.