Computer Network

CN Unit 1 Part 7 MCQs

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Unit 1

Introduction to Data Communication Definition: Effectiveness, Basic Communication Components. Network Architecture Definition, History, Criteria, Goals and Applications of Networks, Categories of networks, Organization of the Internet, ISP, Protocols and standards, The OSI reference model, TCP/IP protocol suite, Network devices and components. Network topology design, Types of connections.

Q121 – In a broader sense, a railway track is an example of
  1. Simplex
  2. Half-duplex
  3. Full-duplex
  4. All of these
(Timothy Williams, McGraw Hill Education)

Ans – (2)

Explanation – A railway track typically allows for communication or travel in both directions, but not simultaneously in both directions on the same track. This is similar to a half-duplex communication system

Q122 – The frequency range at which the land coaxial cables will be used is
  1. 106 to 108 Hz
  2. 1010 to 1011 Hz
  3. 103 to 104 Hz
  4. 1014 to 1015 Hz
(Timothy Williams, McGraw Hill Education)

Ans – (1)

Explanation –

  1. Coaxial Cables: 106 to 108 Hz
  2. Optical Fiber Cables: 1014 to 1015 Hz
  3. Twisted Pair Cables: 103 to 104 Hz
Q123 – Match the following
(1). Data link layer
(2). Physical layer
(3). Presentation layer
(4). Network layer
(i). The lowest layer whose function is to activate, deactivate and maintain the circuit between DTE and DCE
(ii).Perform routing and communication
(iii).Detection and recovery from errors in the transmitted data
(iv).Provides for the syntax of the data.
 
 
  1. (1)-(iii), (2)-(i), (3)-(iv), (4)-(ii)
  2. (1)-(ii), (2)-(i), (3)-(iv), (4)-(iii)
  3. (1)-(iv), (2)-(i), (3)-(ii), (4)-(iii)
  4. (1)-(ii), (2)-(i), (3)-(iii), (4)-(iv)
(Timothy Williams, McGraw Hill Education)

Ans – (1)

Q124 – Which of the following is true?
  1. The OSI model supports connectionless communication in the network layer
  2. The OSI support both connection oriented and connectionless communication in the transport layer
  3. TCP/IP model support connectionless mode in the network layer
  4. TCP/IP support connection-oriented mode in transport layer.

Ans – (3)

Explanation –

  1. OSI model supports both connection oriented and connectionless communication in the network layer. Hence option 1 is false.
  2. OSI model supports connection-oriented communication in the transport layer. Hence option 2 is false.
  3. TCP/IP model support connectionless mode in the network layer. Hence option 3 is true.
  4. OSI model supports both connection oriented and connectionless communication in the network layer. Hence option 4 is false.
Q125 – Twisted pair cables transmit signals in the form of
  1. Infrared light
  2. Light
  3. Radio waves
  4. Electric current

Ans – (4)

Explanation – Twisted pair cables use electrical signals to transmit data. The twisted design helps to reduce electromagnetic interference from external sources and crosstalk between adjacent pairs within the cable.

Q126 – Arrange the following as per the year in which they came into existence
  1. www
  2. ARPANET
  3. Wifi
  4. TCP/IP
Choose the correct answer
  1. 2 -> 4 -> 1 -> 3
  2. 2 -> 1 -> 4 -> 3
  3. 3 -> 4 -> 1 -> 2
  4. 2 -> 4 -> 3 -> 1

Ans – (1)

Explanation –

ARPANET – ARPANET, the precursor to the internet, was established in 1969.

TCP/IP – The TCP/IP protocol suite was developed in the early 1970s.

www – The World Wide Web was proposed by Tim Berners-Lee in 1989 and became publicly available in 1991.

Wifi – Wifi technology was invented in the 1990s and became commercially available in the late 1997s.

 

Q127 – How many OSI layers are covered in the X.25 standard?
  1. Two
  2. Three
  3. Seven
  4. Six

Ans – (2)

Explanation –

The X.25 standard covers three layers of the OSI model: the Physical Layer, Data Link Layer, and Network Layer.

X.25 is a widely used standard for packet-switched wide area network (WAN) communication. It was developed in the 1970s by the International Telecommunication Union – Telecommunication Standardization Sector (ITU-T). X.25 defines the protocols for the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the public data network.

 

Q128 – The X.25 standard specifies a ……………
  1. technique for start-stop data
  2. technique for dial access
  3. DTE/DCE interface
  4. None of above

Ans – (3)

Explanation – X.25 is a widely used standard for packet-switched wide area network (WAN) communication. It was developed in the 1970s by the International Telecommunication Union – Telecommunication Standardization Sector (ITU-T). X.25 defines the protocols for the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the public data network.

Q129 – One computer can communicate to another computer by using
  1. Port address
  2. Physical address
  3. Logical address
  4. Specific Address

Ans – (3)

Explanation – One computer can communicate with another computer using logical addresses. Logical addresses, such as IP addresses, are used to identify devices on a network and enable communication between them.

Q130 – Which topology requires a central controller or hub?
  1. Mesh
  2. Star
  3. Bus
  4. Ring

Ans – (2)

Explanation – In a star topology, all nodes (computers or devices) are connected to a central hub or switch. The hub or switch serves as a central controller, managing and controlling the communication between the nodes. This centralized structure simplifies network management and troubleshooting but can also create a single point of failure.

Q131 – Which topology requires a multipoint connection?
  1. Mesh
  2. Star
  3. Bus
  4. Ring

Ans – (3)

Explanation –

In a bus topology, all nodes are connected to a single communication line, creating a shared communication medium. Each node in the bus network has a direct connection to the communication line, allowing for a multipoint connection where multiple nodes can transmit and receive data simultaneously.

Q132 – In mesh topology, every device has a dedicated topology of
  1. Multipoint linking
  2. Point to point linking
  3. None of Above
  4. Both a and b

Ans – (2)

Explanation – In a mesh topology, each device is connected to every other device through a dedicated point-to-point link. This means that each device has a direct connection to every other device in the network, forming a fully interconnected mesh of communication links. Therefore, the correct answer is option b. Point to point linking.

Q133 – Bus, ring and star topologies mostly used in the
  1. LAN
  2. MAN
  3. WAN
  4. Internetwork

Ans – (1)

Explanation –

These topologies are commonly used in LAN environments to connect devices within a limited geographic area, such as a single building or campus. Each of these topologies has its own advantages and disadvantages, making them suitable for different types of LAN deployments.

Q134 – Combination of two or more topologies are called
  1. Star
  2. Bus
  3. Ring
  4. Hybrid

Ans – (4)

Explanation – A hybrid topology is a combination of two or more different types of network topologies, such as star, bus, or ring, integrated into a single network.

Q135 – Star Topology is Based On a Central Device that can be __________?
  1. HUB
  2. Switch
  3. Only a
  4. Both a and b

Ans – (4)

Explanation – In a star topology, the central device can be either a hub or a switch. Both of these devices connect the various nodes in the network to facilitate communication.

Q136 – In a star-topology Ethernet LAN, _______ is just a point where the signals coming from different stations collide; it is the collision point.
  1. An active hub
  2. A passive hub
  3. Either (a) or (b)
  4. Neither (a) nor (b)

Ans – (2)

Explanation –

In a star-topology Ethernet LAN, a passive hub is a point where signals from different stations collide. Unlike an active hub, a passive hub does not amplify or regenerate the signals; it merely provides a physical connection point for the network devices.

Q137 – Security and privacy are less in a ……………… topology.
  1. bus
  2. mesh
  3. star
  4. tree

Ans – (1)

Explanation –

In a bus topology, all devices share a common communication line, making it easier for unauthorized users to access the network and intercept data. This shared medium can lead to lower security and privacy compared to other topologies like mesh, star, or tree.

Q138 – A network that contains multiple hubs is most likely configured in a …………… topology.
  1. bus
  2. mesh
  3. star
  4. tree

Ans – (4)

Explanation – A tree topology is a network configuration that contains multiple hubs, organizing the network in a hierarchical manner. This structure combines characteristics of both star and bus topologies, with multiple star-configured networks connected to a central bus.

Q139 – Source routing bridges in the same LANs must have …………… bridge Number.
  1. Same
  2. Different
  3. Source
  4. Destination

Ans – (2)

Explanation –

Source routing bridges in the same LANs must have different bridge numbers. This ensures that each bridge can be uniquely identified and properly route data within the network.

Q140 – Which network topology is considered passive?
  1. Bus
  2. Star
  3. Ring
  4. Cross

Ans – (1)

Explanation – In a bus topology, the network is considered passive because the nodes simply listen to the data being transmitted along the shared communication line and do not actively route or manage the data. The communication is managed by the devices themselves rather than a central node.

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