Computer Network

CN Unit 1 Part 6 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.

Q101 – Devices on one network can communicate with devices on another network via a …….
  1. File Server
  2. Utility Server
  3. Printer Server
  4. Gateway

Ans – (4)

Explanation – A gateway is a network node that connects two networks using different protocols so that information can be passed from one network to the other.

Q102 – Baud means
  1. The number of bits transmitted per unit time
  2. The number of bytes transmitted per unit time
  3. The rate at which the signal changes
  4. None

Ans – (3)

Explanation –

Baud rate refers to the number of signal changes or symbols transmitted per second.

It is a measure of the speed of transmission for modulated signals and can differ from the bit rate if each signal change carries more than one bit of information.

Q103 – The data unit in the TCP/IP layer called a …..
  1. Message
  2. Segment
  3. Datagram
  4. Frame

Ans – (2)

Explanation – In the TCP/IP protocol suite, data is divided into segments at the Transport layer (Layer 4), with each segment containing a header and a portion of the data being transmitted.

Q104 – A network that needs human beings to manually route signals is called….
  1. Fiber Optic Network
  2. Bus Network
  3. T-switched network
  4. Ring network

Ans – (3)

Explanation – In a T-switched network, human operators physically connect or route signals by manually plugging and unplugging cables or wires to establish communication paths between different devices or nodes.

Q105 – Infrared waves are used for
  1. Outdoor LANs
  2. Satellite
  3. Indoor LANs
  4. Wired LANs

Ans – (3)

Explanation –

Infrared waves are suitable for indoor LANs because they can provide high-speed data communication over short distances. Devices like remote controls, some wireless keyboards and mice, and certain short-range communication systems use infrared technology.

Q106 – IEEE 802.3ab defines Gigabit Ethernet transmission over unshielded twisted pair (UTP) category 5, 5e or 6 cabling known as ………………..
  1. 1000 BASE-T
  2. 1000 BASE-SX
  3. 1000 BASE-LX
  4. 1000 BASE-CX

Ans – (1)

Explanation – “1000” in “1000 BASE-T” refers to the transmission speed, which is 1000 Mbps or 1 Gbps (Gigabit per second).

“BASE” indicates baseband transmission, where the entire bandwidth of the medium (in this case, twisted pair cable) is used for a single type of signal.

“T” stands for twisted pair, indicating the type of medium used for transmission.

 

Q107 – Which of the following are Gigabit Ethernets?
  1. 1000 BASE-SX
  2. 1000 BASE-LX
  3. 1000 BASE-CX
  4. All of the above

Ans – (4)

Explanation –

Gigabit Ethernet refers to a family of Ethernet technologies ( https://www.cables-solutions.com/basics-1000base-sx-1000base-lx-sfp.html/1000base-lx-sfp ) that provide data transfer rates of 1 gigabit per second (Gbps). All the options listed here are types of Gigabit Ethernet.

  1. 1000 BASE-SX – This type uses short-wavelength laser optics and is typically used for multimode fiber cables. It is suitable for shorter distances, generally up to 550 meters.
  2. 1000 BASE-LX – This type uses long-wavelength laser optics and can work with both single-mode and multimode fiber cables. It is used for longer distances, typically up to 10 kilometers over single-mode fiber.
  3. 1000 BASE-CX – This type uses copper cabling and is designed for very short distances, usually up to 25 meters. It is commonly used for connections within a rack or between adjacent racks in data centers.
Q108 – Arrange their wavelength in decreasing order Visible light, Radio Waves and Microwaves
  1. Radio waves < Microwave < Visible light
  2. Radio waves < Visible light < Microwave
  3. Radio waves > Microwave > Visible light
  4. Microwave > Radio waves > Visible light

Ans – (3)

Explanation –

Radio Waves – These have the longest wavelengths in the electromagnetic spectrum, ranging from about 1 millimeter to 100 kilometers.

Microwaves – These have shorter wavelengths than radio waves, typically ranging from 1 millimeter to 1 meter.

Visible Light – This has much shorter wavelengths, ranging from about 400 to 700 nanometers (4 x 10-7 to 7 x 10-7 meters).

 

Q109 – ………… was the first step in the evolution of Ethernet from a coaxial cable bus to hub managed, twisted pair network.
  1. Star LAN
  2. Ring LAN
  3. Mesh LAN
  4. All of the above

Ans – (1)

Explanation –

In a Star LAN, devices are connected to a central hub or switch, which manages the network traffic. This architecture replaced the traditional coaxial cable bus topology and paved the way for the use of twisted pair cabling in Ethernet networks.

Q110 – Match the following IEEE No to their corresponding Name for IEEE 802 standards for LANs.
i) 802.3                          a) WiFi
ii) 802.11                        b) WiMax
iii) 802.15.1                     c) Ethernet
iv) 802.16                        d) Bluetooth
  1. i-b, ii-c, iii-d, iv-a
  2. i-c, ii-d, iii-a, iv-b
  3. i-c, ii-a, iii-d, iv-b
  4. i-b, ii-d, iii-c, iv-a

Ans – (3)

Explanation –

IEEE 802.3 standardizes Ethernet LAN technology, specifying the physical and data link layers of wired Ethernet.

IEEE 802.11 defines the standards for wireless LANs, commonly known as WiFi.

IEEE 802.15.1 is the standard for Bluetooth wireless technology.

IEEE 802.16 is for WiMAX (Wireless Worldwide Interoperability for Microwave Access), a wireless broadband technology.

Q111 – What does ‘Fi’ in WiFi stand for?
  1. Frequency
  2. Field
  3. Field
  4. Fidelity

Ans – (4)

Explanation –

WiFi is a brand name for wireless networking technology that uses radio waves to provide high-speed Internet and network connections. The term WiFi stands for Wireless Fidelity.

Q112 – The type of access used in GSM technology is ___________.
  1. FDMA
  2. TDMA
  3. FDMA/TDMA
  4. CDMA

Ans – (3)

Explanation –

GSM (Global System for Mobile Communications) uses a combination of FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access).

FDMA is used to divide the frequency bands into channels, and then TDMA is used to divide each channel into time slots for multiple users to share the same frequency channel.

Q113 – As the data packets moves from the lower to the upper level, headers are __________
  1. Added
  2. Subtracted
  3. Rearranged
  4. Modified

Ans – (1)

Explanation – Headers are added to the data packets at each layer of the networking protocol stack as they move upwards towards the application layer. These headers contain information necessary for the proper routing and processing of the data at each layer.

Q114 – In Internet protocol stack, when data is sent from device A to device B, the 5th layer to receive data at B is
  1. Application layer
  2. Transport layer
  3. Data Link layer
  4. Session layer

Ans – (1)

Explanation –

In the Internet protocol stack, when data is sent from device A to device B, the 5th layer to receive data at device B is the Application layer.

The Application layer is responsible for providing communication services directly to user applications. It interacts with software applications to establish communication, format data, and manage user interfaces.

Q115 –
Match the following
P. SMTP
Q. BGP
R. TCP
S. PPP
(1) Application layer
(2) Transport layer
(3) Data link layer
(4) Network layer
(5) Physical layer

 

  1. P-(2), Q-(1), R-(3), S-(5)
  2. P-(1), Q-(4), R-(2), S-(3)
  3. P-(1), Q-(4), R-(2), S-(5)
  4. P-(2), Q-(4), R-(1), S-(3)
(GATE)

Ans – (2)

Explanation –

SMTP (Simple Mail Transfer Protocol) is used for sending emails and operates at the Application layer.

BGP (Border Gateway Protocol) is used for routing data between different networks on the internet and operates at the Network layer.

TCP (Transmission Control Protocol) ensures reliable data transmission between computers and operates at the Transport layer.

PPP (Point-to-Point Protocol) is used for direct communication between two network nodes and operates at the Data link layer.

Q116 – What is the speed of a 100BaseT cable?
  1. 10 mbps
  2. 100 mbps
  3. 1 gbps
  4. None of the above

Ans – (2)

Explanation –

10BaseT: Transmits data at 10 megabits per second (Mbps) over twisted pair cables.

100BaseT: Transmits data at 100 megabits per second (Mbps) over twisted pair cables. This is also known as Fast Ethernet.

1000BaseT: Transmits data at 1000 megabits per second (1 gigabit per second, Gbps) over twisted pair cables. This is known as Gigabit Ethernet.

Base: This stands for “baseband” which means that the Ethernet signals are transmitted directly over the medium without using a carrier frequency.

T: This stands for “twisted pair” referring to the type of cabling used.

Q117 – Choose the correct Base-T cables and their speeds.
  1. 10Base-T = Ethernet with 10mbps, 100Base-T = Fast Ethernet with 100 mbps speed
  2. 10GBase-T = Gigabit Ethernet with 1000 mbps or 1 gbps
  3. 10GBase = 10 Gigabit Ethernet with 10 gbps speed
  4. All of the above

Ans – (4)

Explanation –

10Base-T = Ethernet with 10mbps, 100Base-T = Fast Ethernet with 100 mbps speed

10GBase-T = Gigabit Ethernet with 1000 mbps or 1 gbps

10GBase = 10 Gigabit Ethernet with 10 gbps speed

Q118 – Choose the correct abbreviations below.
  1. CSMA – Carrier Sense Multiple Access
  2. CD – Collision Detection
  3. CA – Collision Avoidance
  4. All of the above

Ans – (4)

Explanation –

CSMA stands for Carrier Sense Multiple Access, which is a network protocol that listens to a network channel before sending data to avoid collisions.

CD stands for Collision Detection, which is used in Ethernet networks to detect collisions when two devices attempt to send data simultaneously.

CA stands for Collision Avoidance, which is used in wireless networks to avoid collisions by waiting before sending data if the channel is busy.

Q119 – Standard Ethernet cards can support data transfer between _____________.
  1. 10 Mbps and 10 Gbps
  2. 10 Mbps and 1 Gbps
  3. 1 Mbps and 1 Gbps
  4. 10 Kbps and 1 Mbps

Ans – (2)

Explanation – Standard Ethernet cards can support data transfer speeds ranging from 10 megabits per second (Mbps) to 1 gigabit per second (Gbps).

Q120 – The network topology that supports bi-directional links between each possible node is
  1. Ring
  2. Star
  3. Tree
  4. Mesh
(Timothy Williams, McGraw Hill Education)

Ans – (4)

Explanation – In a mesh topology, each node is connected to every other node in the network, allowing for direct bi-directional communication between all nodes. This topology provides high redundancy and reliability, as there are multiple paths for data to travel, which can be beneficial in case of link failures.

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