Module 1: Introduction to Networking
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In this post, I provide complete, accurate, and detailed explanations for the answers to Module 1: Introduction to Networking of Course 2: The Bits and Bytes of Computer Networking – Google IT Support Professional Certificate
Whether you’re preparing for quizzes or brushing up on your knowledge, these insights will help you master the concepts effectively. Let’s dive into the correct answers and detailed explanations for each question!
TCP/IP
Practice Quiz
1. Which of the following is an example of a network layer (layer 3) protocol in the five-layer TCP/IP model?
- IP
- TCP
- UDP
- Ethernet
Explanation:
The Internet Protocol (IP) operates at the network layer (Layer 3) and is responsible for addressing and routing packets.
2. Which of these is an example of something that works on the application layer (layer 5 of the five-layer TCP/IP model)?
- UDP
- An ethernet cable
- A router
- A browser
Explanation:
The application layer (Layer 5) includes services that interact directly with end-users, such as web browsers, email clients, and FTP applications.
3. Which layer of the five layer TCP/IP model deals with cabling and connectors?
- The physical layer
- The application layer
- The transport layer
- The network layer
Explanation:
The physical layer (Layer 1) is responsible for the actual hardware connections, including cables, connectors, and transmission media.
4. Which level of the TCP/IP five-layer model does a router operate on?
- The transport layer
- The network layer
- The data link layer
- The application layer
Explanation:
Routers function at the network layer (Layer 3), where they forward data packets between different networks using IP addresses.
5. On which layer are Ethernet standards and some wireless technologies operating?
- The network layer
- The data link layer
- The physical layer
- The transport layer
Explanation:
The data link layer (Layer 2) manages how data is formatted for transmission and includes Ethernet and wireless technologies like Wi-Fi.
Networking Devices
Practice Quiz
6. Which of these allows connections from many devices and inspects the contents of ethernet protocol data?
- A cable
- A hub
- A switch
- A collision domain
Explanation:
A network switch connects multiple devices and inspects Ethernet frames to determine where to forward them.
7. What does LAN stand for?
- Local area network
- Locally available network
- Large area network
- Little area network
Explanation:
LAN (Local Area Network) refers to a network that connects computers within a small geographic area, such as an office or home.
8. What's a router?
- A physical layer device that prevents crosstalk
- A device that knows how to forward data between independent networks.
- A physical layer device that allows connections for many computers at once
- A more advanced version of a switch
Explanation:
A router directs data packets between different networks, determining the best path for data transmission.
9. Which of these is a server?
- A device operating on the data link layer that connects many devices together inspects ethernet protocol data
- Something providing data to something requesting the data
- A device that forwards data between multiple networks
- Something receiving data from something providing data
Explanation:
A server is a system that provides resources, data, or services to client devices over a network.
10. What kind of wiring is in cables that communicate in voltage changes that are received by the receiving device as ones and zeros?
- Gold
- Fiber
- Aluminum
- Copper
Explanation:
Copper cables transmit electrical signals using voltage changes, which are interpreted as binary data (1s and 0s).
The Physical Layer
Practice Quiz
11. What modulation type is used for computer networks?
- Line coding
- Line crimping
- Simplex communication
- RJ45
Explanation:
Line coding is a type of modulation used in computer networks to convert digital data into signals that can be transmitted over a medium.
12. What is the difference between full duplex and half duplex?
- Full duplex allows communications in two directions at the same time; half duplex means that only one side can communicate at a time.
- Half duplex occurs when hubs are in use; full duplex occurs when switches are in use.
- Full duplex is slower than half duplex.
- Full duplex is a form of simplex communications.
Explanation:
Full duplex communication allows both devices to send and receive data simultaneously, improving speed and efficiency. In contrast, half duplex communication only allows data to be sent or received at a time, leading to potential delays.
13. The ____________ consists of devices and means of transmitting bits across computer networks.
- modulation
- physical layer
- network layer
- data link layer
Explanation:
The physical layer of the OSI model handles the transmission of raw bits over a communication channel using hardware devices like cables and switches.
14. What is the most common type of cabling used for connecting computing devices?
- VGA Cable
- SATA Cable
- Power Cable
- Twisted Pair Cable
Explanation:
Twisted pair cables (like Cat5e, Cat6) are widely used for Ethernet connections due to their cost-effectiveness and efficiency.
15. Which of the following are category types of Twisted Pair Ethernet cable? (Select all that apply)
- Foiled Twisted Pair (FTP).
- USB Cable
- Unshielded Twisted Pair (UTP).
- Shielded Twisted Pair (STP).
Explanation:
FTP, UTP, and STP are different types of twisted pair cables used in networking, whereas USB cables are used for data transfer and charging, not for Ethernet connections.
Module 1 challenge: Networking Basics
Graded Quiz
16. Which protocol provides mechanisms ensuring data is reliably delivered?
- Dynamic Host Configuration Protocol (DHCP)
- Transmission Control Protocol (TCP)
- User Datagram Protocol (UDP)
- Internet Protocol (IP)
Explanation:
TCP ensures reliable data transmission by establishing connections, retransmitting lost packets, and verifying data integrity.
17. Select the right order of the TCP/IP Five-layer network model.
- Physical Layer > Data Link Layer > Network Layer > Transport Layer > Application Layer.
- Physical Layer > Application Layer > Data link Layer > Network Layer > Transport Layer
- Physical Layer > Network Layer > Data link Layer > Transport Layer > Application Layer
- Physical Layer > Data link Layer > Transport Layer > Network Layer > Application Layer
Explanation:
This is the correct order in which network communication happens, from physical hardware to application-level interactions.
18. Which layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model does IP use?
- Network
- Physical
- Transport
- Data Link
Explanation:
The Internet Protocol (IP) operates at the Network layer, handling routing and addressing of packets across networks.
19. What type of cable communicates binary data by changing the voltage between two ranges?
- Copper
- Fiber
- Silver
- Gold
Explanation:
Copper cables transmit data using electrical signals, which represent binary 0s and 1s through voltage changes.
20. What is a network with only a single device at each end of the link called?
- A point to point connection
- A twisted pair network
- A switching hub
- A collision domain
Explanation:
A point-to-point connection directly links two devices without intermediate networking equipment.
21. Which device forwards data and operates at layer three of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?
- Client
- Switch
- Router
- Hub
Explanation:
A router operates at the Network layer (Layer 3), forwarding data packets between different networks.
22. Which of the following is something that requests data from a server?
- Hub
- Router
- Client
- Switch
Explanation:
A client is a device or application that requests data from a server in a network.
23. Which type of communication does a telephone use?
- Full duplex
- Twisted Half
- Duplex
- Simplex
Explanation:
Full duplex communication allows both parties to talk and listen simultaneously, as in a telephone conversation.
24. Fill in the blank: There will almost always be some troubleshooting data available through_____.
- Stop LEDs
- Wire lights
- Port lights
- Action LEDs
Explanation:
Port lights indicate network activity and connection status, helping diagnose connectivity issues.
25. Fill in the blank: The most common data link layer protocol for wired connections is _____.
- UDP
- BGP
- TCP
- Ethernet
Explanation:
Ethernet is the dominant protocol for wired networking at the Data Link layer.
26. What does the letter B represent in a Media Access Control (MAC) address?
- 9
- 10
- 15
- 11
Explanation:
In hexadecimal, B corresponds to the decimal value 11.
27. Where in an ethernet frame will you find a Virtual Local Area Network (VLAN) header?
- Before the EtherType field
- Frame Check Sequence
- Preamble
- Payload
Explanation:
The VLAN header is inserted before the EtherType field to identify and segment network traffic.
28. True or false: The TCP provides mechanisms to ensure that data is reliably delivered.
- True
- False
Explanation:
Transmission Control Protocol (TCP) ensures reliable data delivery by establishing connections, retransmitting lost packets, and verifying data integrity.
29. Which of the following is the fifth layer of the TCP/IP Five-layer network model.
- Physical
- Application
- Transport
- Data Link
Explanation:
The five layers in the TCP/IP model are: Physical, Data Link, Network, Transport, and Application. The Application layer is the fifth and topmost layer.
30. When an electrical pulse on one wire is accidentally detected on another nearby wire, this is known as what?
- Multicast
- Duplex
- Cross Talk
- Preamble
Explanation:
Cross talk occurs when signals from one wire interfere with those on another wire, causing noise and potential data corruption.
31. Which of the following is a device that knows how to forward traffic between independent networks?
- Switch
- Hub
- Client
- Router
Explanation:
A router operates at the Network layer (Layer 3) and forwards data between different networks based on IP addresses.
32. True or false: Most devices are purely a server or a client.
- True
- False
Explanation:
Most devices function as both servers and clients. For example, a computer can request data from a server (client role) while also sharing files (server role).
33. Fill in the blank: When data flows across a cable in both directions, this is known as_____ communication.
- Cross talk
- Ethernet
- Simplex
- Duplex
Explanation:
Duplex communication allows data transmission in both directions, either simultaneously (full duplex) or one at a time (half duplex).
34. What is the most common plug used with twisted pair network cables?
- Registered Jack 45
- Registered Jack 35
- Registered Jack 11
- Registered Jack 46
Explanation:
RJ-45 connectors are widely used for Ethernet networking with twisted pair cables (e.g., Cat5e, Cat6).
35. What does TCP stand for?
- Transmission Control Protocol
- Translational Carrier Pathway
- Topical Carrier Protocol
- Timing Control Protocol
Explanation:
TCP (Transmission Control Protocol) is a core protocol of the Internet that ensures reliable data transmission.
36. Which of the following is the first layer of the TCP/IP Five-layer network model.
- Physical
- Network
- Data link
- Transport
Explanation:
The five layers in the TCP/IP model are Physical, Data Link, Network, Transport, and Application. The Physical layer is responsible for transmitting raw bits over a medium.
37. True or false: Fiber cables use pulses of light to represent the ones and zeros of data.
- True
- False
Explanation:
Fiber optic cables use light pulses to transmit binary data, allowing high-speed data transfer over long distances.
38. Multiple systems try to send data at the same time. The electrical pulses sent across the cable interfere with each other. What type of network segment is being used?
- Wide Area Network (WAN)
- Subnet
- Collision domain
- Local Area Network (LAN)
Explanation:
A collision domain is a network segment where devices share the same communication channel, leading to data collisions when multiple devices transmit simultaneously.
39. A Local Area Network (LAN) uses Category 6 cabling. An issue with a connection results in a network link degradation and only one device can communicate at a time, but information can still go in either direction. What is the connection operating at?
- Full Duplex
- Half Duplex
- Partial
- Simplex
Explanation:
In half-duplex communication, data can flow in both directions, but only one device transmits at a time, leading to reduced efficiency.
40. Which of these devices contains many network ports, but does no other work than being a container for cable endpoints?
- Hub
- Router
- Patch Panel
- Switch
Explanation:
A patch panel is a hardware device that organizes and connects network cables but does not process or forward traffic.
41. What is used to determine when the communications channels are clear and when a device is free to transmit data?
- Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
- Ethernet
- Transmission Control Protocol (TCP)
- Internet Protocol (IP)
Explanation:
CSMA/CD is a network protocol used in Ethernet networks to detect and manage collisions, ensuring devices transmit data only when the channel is clear.
42. Which layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for defining a common way to interpret signals so network devices can communicate?
- Data link
- Transport
- Network
- Application
Explanation:
The Data Link Layer ensures that signals are interpreted correctly and allows devices to communicate within the same network.
Related contents:
Module 2: The Network Layer
Module 3: The Transport and Application Layers
Module 4: Networking Services
Module 5: Connecting to the Internet
Module 6: Troubleshooting and the Future of Networking
