Data Link Layer: Channel Allocation

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Questions and Answers

Which data link layer function ensures that a sending station does not overwhelm a receiving station with data?

  • Addressing
  • Channel allocation
  • Flow control (correct)
  • Error control

What is the primary purpose of the Sliding Window Protocol in the data link layer?

  • To prevent collisions on the network
  • To assign IP addresses to devices
  • To manage and acknowledge multiple frames efficiently (correct)
  • To encrypt data for secure transmission

In the context of multiple access protocols, what is a fundamental challenge addressed by channel allocation methods?

  • Distributing a communication channel fairly among multiple users (correct)
  • Minimizing power consumption in network devices
  • Maximizing the physical distance between network nodes
  • Ensuring data encryption

Which of the following protocols is categorized as a multiple access protocol?

<p>ALOHA (C)</p> Signup and view all the answers

What is the key difference between pure ALOHA and slotted ALOHA?

<p>Slotted ALOHA divides time into discrete intervals, while pure ALOHA allows transmissions at any time. (A)</p> Signup and view all the answers

In CSMA protocols, what action does a station typically take when it senses that the channel is busy?

<p>Defers transmission until the channel is idle (B)</p> Signup and view all the answers

Which type of multiple access protocol eliminates data collisions by pre-assigning transmission slots to specific devices?

<p>Collision-free protocols (D)</p> Signup and view all the answers

What is the primary advantage of using polling as a channel allocation method?

<p>Guaranteed channel access for all devices (B)</p> Signup and view all the answers

Which layer of the OSI model is primarily responsible for routing data packets from one network to another?

<p>Network Layer (D)</p> Signup and view all the answers

What is the purpose of routing algorithms?

<p>To determine the best path for data packets to reach their destination (C)</p> Signup and view all the answers

What is the main goal of congestion control algorithms in a network?

<p>To prevent network overload and maintain network performance (A)</p> Signup and view all the answers

What functions does the IP protocol provide?

<p>Unreliable, connectionless communication and addressing (A)</p> Signup and view all the answers

What is the primary purpose of IP addresses?

<p>To uniquely identify devices on a network (B)</p> Signup and view all the answers

Which of the following is a key characteristic of distance vector routing algorithms?

<p>They exchange information only with directly connected neighbors. (B)</p> Signup and view all the answers

What is a common approach used by congestion control algorithms to reduce network congestion?

<p>Reducing the rate at which data is sent (B)</p> Signup and view all the answers

Why is subnetting used with IP addresses?

<p>To divide a network into smaller, more manageable segments (C)</p> Signup and view all the answers

Which type of IP address is typically used for one-to-many communication?

<p>Multicast (A)</p> Signup and view all the answers

How do link state routing algorithms differ from distance vector routing algorithms?

<p>Link state algorithms exchange routing information with all routers in the network, while distance vector algorithms exchange information only with neighbors. (D)</p> Signup and view all the answers

In the context of congestion control, what does 'leaky bucket' refer to?

<p>A mechanism for regulating the rate of data entering the network. (C)</p> Signup and view all the answers

What is typically contained in the header of an IP packet?

<p>Source and destination IP addresses (B)</p> Signup and view all the answers

Flashcards

Data Link Layer

The second layer in the OSI model, responsible for transferring data between adjacent network nodes in a wide area network or between nodes on the same local area network.

Error Control

Ensuring that data packets are delivered in the correct order and without errors.

Flow Control

Regulating the amount of data sent to prevent overwhelming the receiver.

Sliding Window Protocol

A method for reliable and sequential transmission of data frames.

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Channel Allocation Problem

Allocating a communication channel among multiple users or devices.

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Multiple Access Protocols

Protocols that allow multiple nodes to share a single broadcast channel.

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ALOHA

An early multiple access protocol for packet radio networks, where each station transmits whenever it has data to send.

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CSMA Protocols

Protocols that listen to the channel before transmitting to avoid collisions.

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Collision-Free Protocols

Protocols that eliminate collisions by scheduling transmissions.

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Polling

A method where a central device asks each node in turn if it has data to transmit.

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Network Layer

The third layer in the OSI model, responsible for routing data packets between different networks.

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Routing Algorithms

Algorithms that determine the best path for data packets to travel from source to destination.

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Congestion Control Algorithms

Techniques used to prevent or alleviate congestion in a network.

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IP Protocol

The primary protocol used for transmitting data across the Internet.

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IP Addresses

Numerical labels assigned to each device participating in a computer network for communication using the Internet Protocol.

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Study Notes

  • Data link layer facilitates reliable communication across a single link.
  • Key responsibilities include addressing, error control, and flow control.
  • Addressing enables the identification of devices on the network.
  • Error control mechanisms detect and correct errors introduced during transmission.
  • Flow control manages the rate of data transmission to prevent overwhelming the receiver.
  • Sliding Window Protocol is a method of flow control.

Channel Allocation

  • Channel allocation addresses the problem of efficiently sharing a communication channel among multiple users or devices.
  • Multiple Access Protocols are essential for coordinating access to the shared channel and avoiding conflicts.
  • ALOHA is a simple multiple access protocol where devices transmit whenever they have data.
  • CSMA (Carrier Sense Multiple Access) protocols reduce collisions by having devices listen before transmitting.
  • Collision Free protocols avoid collisions altogether through techniques like scheduling or reservation.
  • Polling involves a central device querying each device in turn to see if it has data to transmit.

Network Layer

  • Network layer is responsible for routing data packets between different networks.
  • Routing Algorithms determine the best path for data packets to travel from source to destination.
  • Congestion Control Algorithms manage network congestion by regulating data flow.
  • IP (Internet Protocol) is the primary protocol used for addressing and routing packets on the internet.
  • IP Addresses are unique numerical identifiers assigned to devices on a network.

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