Computer Network Management Questions and Answers – Integrated Services: ISDN and Broadband

This set of Computer Network Management Multiple Choice Questions & Answers (MCQs) focuses on “Integrated Services: ISDN and Broadband”.

1. ISDN is the abbreviation for ___________ in computer networking.
a) Insecure Service Digital Network
b) Integrated Services Digital Network
c) Intelligent Secure Digital Network
d) Integrated Secure Digital Network
View Answer

Answer: b
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.

2. Integrated Services Digital Network (ISDN) can be classified into ____________ and _________ ISDN.
a) Wide band, Narrow band
b) Baseband, Pass band
c) Narrow band, Broadband
d) Broadband, Baseband
View Answer

Answer: c
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.

3. Basic Rate Interface (BRI) provides a better connection and is more reliable than the Primary Rate Interface (PRI).
a) True
b) False
View Answer

Answer: b
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.

4. _________ is ISDN’s connection control protocol.
a) Q.931 Protocol
b) Session Initiation Protocol (SIP)
c) H.323 Protocol
d) Internet Control Message Protocol (ICMP)
View Answer

Answer: a
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.

5. Integrated Services Digital Network (ISDN) is a ___________ interface between the subscriber and the central office.
a) simplex
b) half-duplex
c) full-duplex
d) multiplex
View Answer

Answer: c
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.
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6. _________ is an Upper Layer Protocol that provides Flow Control.
a) SMTP (Simple Mail Transfer Protocol)
b) Frame Relay Protocol
c) TCP (Transmission Control Protocol)
d) ICMP (Internet Control Message Protocol)
View Answer

Answer: a
Explanation: SMTP is an upper level protocol and it provides flow control. Whereas Frame relay Protocol operates in the layer such as Data Link Layer that is at lower levels of OSI model. Thus it doesn’t provide flow control or error control. Similarly other protocols such as TCP and ICMP operate in the lower levels of the OSI model.

7. Which three areas have advanced due to significant contributions from Broadband Network and Services?
a) ATM, SONET/SDH, and broadband access technology
b) MPLS, Switching technology, and broadband technology
c) Frame Relay, ISDN and narrowband access technology
d) VPN, Firewall, and WAN technology
View Answer

Answer: a
Explanation: Some network services require larger bandwidths that could not be achieved using Frame Relay. This has led to the implementation of broadband ISDN or also known as broadband network. Broadband network and service have contributed significantly in three areas. They are ATM (Asynchronous Transfer Mode), SONET (Synchronous Optical Network)/SDH (Synchronous Digital Hierarchy), and broadband access technology.

8. X.25 Protocol can be carried over _________ channels of a Basic Rate Interface (BRI) Line.
a) B
b) D
c) D or H
d) B or D
View Answer

Answer: d
Explanation: B channel is the Bearer channel where data and voice communication is carried; D is the Delta channel that carries control and signaling information; and H channel is the High-speed communication channel that is formed by combining multiple Bearer channels. Thus B or D channels of BRI line and B channels of PRI (Primary Rate Interface) line are used for carrying X.25.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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