IT1020: ISO-OSI Reference Model Lecture Quiz

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31 Questions

What is the purpose of the data link layer?

To guarantee successful frame transmission between hops

Which standard body defines physical layer specifications?

ANSI: American National Standards Institute

What is the length of a MAC address?

48 bits

Which layer is responsible for host-to-host communication?

Network Layer

What type of address does the transport layer use for communication?

Port Addresses

Which layer converts digital/analog bits into electrical or optical signals?

Physical Layer

What does the data link layer use for error control?

Flow control

What are the major functions of the Presentation Layer in the OSI model?

Translation, Encryption, Compression

Which layer provides users' interface to the network in the OSI model?

Application Layer

What does the Encryption function in the Presentation Layer aim to achieve?

Protect data from unauthorized access

Which of the following is NOT a function of the Session Layer in the OSI model?

Error Detection

Why is Compression important in the Presentation Layer when sending multimedia content?

To reduce the number of bits transmitted

Which layer of the OSI model adds checkpoints for dialog control during two-way communication?

Session Layer

What is the main purpose of network protocols?

To define a common language for communication

What is a key benefit of using a layered model in network communication?

It creates competition between vendors

Which organization is responsible for the ISO-OSI reference model?

ISO - International Organization for Standardization

What is the ISO standard that covers all aspects of network communications?

Open Systems Interconnection (OSI) model

What did the ISO introduce in the late 1970s to cover network communications?

Open Systems Interconnection (OSI) model

Why does a layered reference model assist in protocol design?

It divides the full process into specific related groups of actions at each layer

Which layer is responsible for converting the digital/analog bits into electrical or optical signals?

Physical Layer

What type of address does the network layer use for communication?

Logical Address (IP Address)

At which layer is the framing done using Ethernet frames?

Data Link Layer

What is the purpose of flow control in the data link layer?

Manages data rate between sender and receiver

Which standard body defines physical layer specifications?

EIA: Electronic Industries Alliance

What addresses are used for process-to-process communication at the transport layer?

Port Addresses

What is the main function of the transport layer?

Segmentation and reassembly

Which layer uses port numbers to identify source and destination processes?

Transport layer

What is the responsibility of the network layer in networking?

Logical addressing

Why is routing necessary in the network layer?

To direct data between source and destination addresses

What does IP addressing provide in networking?

Logical addresses

Which layer is responsible for process-to-process communication?

Transport layer

Study Notes

  • Network protocols define a common format and rules for exchanging messages between devices.
  • The ISO - OSI reference model guides vendors and developers in creating interoperable digital communication products and software programs.
  • The layered reference model divides the communication process into specific groups of actions at each layer to ensure efficiency.
  • Benefits of using a layered model include providing a common language, enabling competition between vendors, and preventing changes in one layer from affecting others.
  • The ISO - OSI reference model, developed by the International Organization for Standardization (ISO), covers all aspects of network communications and was introduced in the late 1970s.
  • The Application layer provides users with interfaces for network access and offers applications like email services, file transfers, remote terminals, and web services.
  • The Presentation layer performs functions like translation, encryption, and compression to ensure data compatibility and security.
  • The Session layer manages dialog control and synchronization during communication processes.
  • The Data Link layer is responsible for ensuring successful frame transmission between network hops, using physical addressing (MAC address) and error control mechanisms.
  • The Physical layer interfaces with raw transmission media, converting digital/analog bits into electrical or optical signals.
  • Standard bodies like EIA, ITU-T, and ANSI define physical layer specifications for network communication.
  • Different layers in the ISO - OSI model use various types of addresses for communication, such as port addresses at the Transport Layer, logical IP addresses at the Network Layer, and physical MAC addresses at the Data Link Layer.

Test your knowledge on network protocols, layered architecture, IOS-OSI model, and the TCP/IP model discussed in the lecture. Understand the rules of communication and the reference model for network communication.

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