Podcast
Questions and Answers
Which of the following best describes the primary function of computer networking?
Which of the following best describes the primary function of computer networking?
- To protect computers from physical damage.
- To increase the processing speed of individual computers.
- To limit the access of computers to external networks.
- To enable communication and data exchange between computers. (correct)
In the context of computer networks, what does 'net' refer to?
In the context of computer networks, what does 'net' refer to?
- The physical mediums connecting computers. (correct)
- The applications running on the computers.
- The security measures implemented on the network.
- The protocols used for communication.
What is the main benefit of using a layered approach in networking?
What is the main benefit of using a layered approach in networking?
- It reduces the number of devices needed in a network.
- It increases the speed of data transmission.
- It allows new technology to be easily implemented by changing only a few layers. (correct)
- It simplifies the physical connections between computers.
Which layer of the OSI model is responsible for establishing pathways between devices?
Which layer of the OSI model is responsible for establishing pathways between devices?
Which of the following is a protocol commonly associated with the application layer of the OSI model?
Which of the following is a protocol commonly associated with the application layer of the OSI model?
Which layer of the OSI model handles error correction and flow control?
Which layer of the OSI model handles error correction and flow control?
Which of the following protocols is responsible for converting domain names into IP addresses?
Which of the following protocols is responsible for converting domain names into IP addresses?
Which OSI model layer specifies how bits are represented on the network medium?
Which OSI model layer specifies how bits are represented on the network medium?
What is the primary difference between IPv4 and IPv6?
What is the primary difference between IPv4 and IPv6?
Which of the following protocols is primarily used for sending emails?
Which of the following protocols is primarily used for sending emails?
What is the function of the session layer in the OSI model?
What is the function of the session layer in the OSI model?
Which layer of the OSI model is responsible for data compression and encryption?
Which layer of the OSI model is responsible for data compression and encryption?
What is the role of the data link layer in the OSI model?
What is the role of the data link layer in the OSI model?
Why was the OSI model created?
Why was the OSI model created?
Which of the following scenarios would most benefit from using UDP over TCP?
Which of the following scenarios would most benefit from using UDP over TCP?
Which of the following is a key characteristic that distinguishes Ethernet from Wi-Fi?
Which of the following is a key characteristic that distinguishes Ethernet from Wi-Fi?
If a network administrator needs to implement a protocol that guarantees delivery of data packets in the same order they were sent, which protocol should they choose?
If a network administrator needs to implement a protocol that guarantees delivery of data packets in the same order they were sent, which protocol should they choose?
Considering future network scalability and the exhaustion of IPv4 addresses, what is the most compelling reason for transitioning to IPv6?
Considering future network scalability and the exhaustion of IPv4 addresses, what is the most compelling reason for transitioning to IPv6?
In a scenario where an application requires real-time data transmission with minimal delay. While also needing guaranteed delivery and re-transmission of lost packets, which combination of protocols would best satisfy these requirements, and what trade-off is inherent in this choice?
In a scenario where an application requires real-time data transmission with minimal delay. While also needing guaranteed delivery and re-transmission of lost packets, which combination of protocols would best satisfy these requirements, and what trade-off is inherent in this choice?
Imagine you are designing a highly specialized network for a financial institution that requires extremely low latency for transaction processing and enhanced security to prevent eavesdropping. Based on the OSI model, at which layers would you implement custom protocols or modifications to optimize performance and security, and what specific challenges might you encounter?
Imagine you are designing a highly specialized network for a financial institution that requires extremely low latency for transaction processing and enhanced security to prevent eavesdropping. Based on the OSI model, at which layers would you implement custom protocols or modifications to optimize performance and security, and what specific challenges might you encounter?
Flashcards
Computer Networking
Computer Networking
Connecting computers to enable communication and data exchange.
Components of a Computer Network
Components of a Computer Network
PCs, servers, hubs, switches, routers, printers, phones and cameras.
Net in Computer Networks
Net in Computer Networks
Physical mediums connecting computers, such as wires and fiber optics.
Work in Computer Networks
Work in Computer Networks
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OSI Model
OSI Model
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Physical Layer
Physical Layer
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Data Link Layer
Data Link Layer
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Network Layer
Network Layer
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Transport Layer
Transport Layer
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Session Layer
Session Layer
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Presentation Layer
Presentation Layer
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Application Layer
Application Layer
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Ethernet, Wi-Fi, Bluetooth
Ethernet, Wi-Fi, Bluetooth
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IPv4 and IPv6
IPv4 and IPv6
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TCP and UDP
TCP and UDP
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HTTP
HTTP
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DNS
DNS
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SMTP
SMTP
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Study Notes
- Computer networking connects computers for communication and data exchange.
- It enables multiple computers or nodes to interact, share information, and collaborate.
- A computer network is a collection of devices that can exchange data.
- The term ‘computer network’ can be broken down into computer + net + work.
- Computers include PCs, hosts, servers, hubs, and routers.
- Not every device on a computer network is a computer; printers, phones, and cameras can be network-enabled.
- Net refers to physical mediums connecting computers, like wires and fibre optics.
- Work refers to the protocols needed to make computer nets run.
- Networking is broken down into a set of layers.
- Separate network layers allow new technology to be easily implemented.
- A standard was created in the late 1970s known as the open systems interconnection model (OSI).
- The Open Systems Interconnection model (OSI Model) is a conceptual model that characterises and standardises the communication functions of a telecommunication or computing system without regard for their underlying internal structure and technology
The OSI model consists of seven layers:
- Physical layer: specifies how the bits are represented on the medium.
- Data link layer: controls who can transmit on the medium at any given time.
- Network layer: establishes pathways between devices.
- Transport layer: error correction and flow control.
- Session layer: provides APIs for application software to manage the connection.
- Presentation layer: compression and encryption.
- Application layer: the application that uses the data (e.g. web browsers).
Common protocols for each layer of the OSI model:
- Physical and data link layer protocols (layers 1 and 2): ethernet (over fibre or unshielded twisted pair).
- Physical and data link layer protocols (layers 1 and 2): 802.11 (wi-fi).
- Physical and data link layer protocols (layers 1 and 2): Bluetooth.
- Network layer protocols (layer 3): IPv4 — internet protocol version 4 — what most of the internet is using.
- Network layer protocols (layer 3): IPv6 — internet protocol version 6 — what most of the internet will move to.
- Transport layer protocols (layer 4): TCP — transmission control protocol.
- Transport layer protocols (layer 4): UDP — user datagram protocol.
- Application layer protocols (layer 5–7): HTTP — hypertext transfer protocol — used to transmit websites.
- Application layer protocols (layer 5–7): DNS — Domain Name System — used to convert a domain name (e.g. en.wikipedia.org) into the appropriate IP address (e.g. 208.80. 154.224).
- Application layer protocols (layer 5–7): SMTP — simple mail transfer protocol — used by email servers.
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