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Questions and Answers
What is the purpose of the data link layer?
What is the purpose of the data link layer?
- To convert digital/analog bits into electrical signals
- To embed control information in headers
- To provide logical addressing (IP address)
- To guarantee successful frame transmission between hops (correct)
Which standard body defines physical layer specifications?
Which standard body defines physical layer specifications?
- EIA: European Industries Association
- ANSI: American National Standards Institute (correct)
- ISO: International Organization for Standardization
- IEEE: Institute of Electrical and Electronics Engineers
What is the length of a MAC address?
What is the length of a MAC address?
- 48 bits (correct)
- 64 bits
- 128 bits
- 32 bits
Which layer is responsible for host-to-host communication?
Which layer is responsible for host-to-host communication?
What type of address does the transport layer use for communication?
What type of address does the transport layer use for communication?
Which layer converts digital/analog bits into electrical or optical signals?
Which layer converts digital/analog bits into electrical or optical signals?
What does the data link layer use for error control?
What does the data link layer use for error control?
What are the major functions of the Presentation Layer in the OSI model?
What are the major functions of the Presentation Layer in the OSI model?
Which layer provides users' interface to the network in the OSI model?
Which layer provides users' interface to the network in the OSI model?
What does the Encryption function in the Presentation Layer aim to achieve?
What does the Encryption function in the Presentation Layer aim to achieve?
Which of the following is NOT a function of the Session Layer in the OSI model?
Which of the following is NOT a function of the Session Layer in the OSI model?
Why is Compression important in the Presentation Layer when sending multimedia content?
Why is Compression important in the Presentation Layer when sending multimedia content?
Which layer of the OSI model adds checkpoints for dialog control during two-way communication?
Which layer of the OSI model adds checkpoints for dialog control during two-way communication?
What is the main purpose of network protocols?
What is the main purpose of network protocols?
What is a key benefit of using a layered model in network communication?
What is a key benefit of using a layered model in network communication?
Which organization is responsible for the ISO-OSI reference model?
Which organization is responsible for the ISO-OSI reference model?
What is the ISO standard that covers all aspects of network communications?
What is the ISO standard that covers all aspects of network communications?
What did the ISO introduce in the late 1970s to cover network communications?
What did the ISO introduce in the late 1970s to cover network communications?
Why does a layered reference model assist in protocol design?
Why does a layered reference model assist in protocol design?
Which layer is responsible for converting the digital/analog bits into electrical or optical signals?
Which layer is responsible for converting the digital/analog bits into electrical or optical signals?
What type of address does the network layer use for communication?
What type of address does the network layer use for communication?
At which layer is the framing done using Ethernet frames?
At which layer is the framing done using Ethernet frames?
What is the purpose of flow control in the data link layer?
What is the purpose of flow control in the data link layer?
Which standard body defines physical layer specifications?
Which standard body defines physical layer specifications?
What addresses are used for process-to-process communication at the transport layer?
What addresses are used for process-to-process communication at the transport layer?
What is the main function of the transport layer?
What is the main function of the transport layer?
Which layer uses port numbers to identify source and destination processes?
Which layer uses port numbers to identify source and destination processes?
What is the responsibility of the network layer in networking?
What is the responsibility of the network layer in networking?
Why is routing necessary in the network layer?
Why is routing necessary in the network layer?
What does IP addressing provide in networking?
What does IP addressing provide in networking?
Which layer is responsible for process-to-process communication?
Which layer is responsible for process-to-process communication?
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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.
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