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CSMA/CD Protokoll
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CSMA/CD Protokoll

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Questions and Answers

CSMA/CD-l on võimalik saavutada flow control ilma ACK-de ja retransmissioonideta.

False

Manchester Encoding on meetod, mis kodeerib andmeid otse signaaliks.

False

CSMA/CD on juurdepääsu meetod, mis kasutab kanali reservatsiooni.

False

Raam on CSMA/CD-s andmeside ühendatud üksus.

<p>True</p> Signup and view all the answers

CSMA/CD-s juhindutakse pöördumiste asemel ACK-de otstarbel.

<p>False</p> Signup and view all the answers

Põrgepuhvimeetodis võib mitu seadet samaaegselt edastada andmeid.

<p>True</p> Signup and view all the answers

Match the following communication concepts with their descriptions:

<p>Flow Control = Regulates the amount of data that can be sent at a given time Access Method = Determines how devices access a shared communication channel Message Encoding = Converts data into a signal for transmission Message Encapsulation = Wraps data in a packet with headers for transmission</p> Signup and view all the answers

Match the following communication protocols with their characteristics:

<p>CSMA/CD = Access method that uses a collision detection mechanism Flow Control = Prevents data overflow by regulating transmission speed Message Encoding = Converts data into a binary format for transmission Message Encapsulation = Adds headers and trailers to data for transmission</p> Signup and view all the answers

Match the following communication terms with their functions:

<p>Flow Control = Prevents network congestion by regulating data transmission Access Method = Determines how devices access a shared communication channel Message Encoding = Translates data into a signal for transmission over a medium Message Encapsulation = Adds error-checking information to data packets</p> Signup and view all the answers

Match the following communication protocols with their purposes:

<p>CSMA/CD = Access method used in Ethernet networks Flow Control = Prevents data loss by regulating transmission speed Message Encoding = Converts data into a format for transmission over a wire Message Encapsulation = Organizes data into packets for transmission over a network</p> Signup and view all the answers

Match the following communication concepts with their applications:

<p>Flow Control = Used in network protocols to prevent data overflow Access Method = Used in local area networks to manage channel access Message Encoding = Used in digital communication systems to convert data Message Encapsulation = Used in packet-switching networks to organize data</p> Signup and view all the answers

Study Notes

CSMA/CD

Flow Control

  • CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection
  • Flow control: a mechanism to prevent network congestion by regulating the amount of data sent by a device
  • In CSMA/CD, flow control is achieved through the use of acknowledgments (ACKs) and retransmissions
    • Sender waits for ACK before sending next packet
    • If no ACK received, sender retransmits packet

Access Method

  • CSMA/CD is a contention-based access method
  • Multiple Access: multiple devices share the same channel
  • Carrier Sense: devices sense the channel before transmitting to detect if it's busy
  • Collision Detection: devices detect collisions (when two devices transmit at the same time) and take corrective action
    • When a collision is detected, devices stop transmitting and wait for a random period before retrying

Message Encoding

  • Manchester Encoding is commonly used in CSMA/CD networks
  • Manchester Encoding: a method of encoding data bits into a signal
    • Each data bit is represented by a transition in the signal (high-to-low or low-to-high)
    • Provides a self-clocking signal, allowing the receiver to extract the original data bits

Message Encapsulation

  • Frame: the basic unit of data transmission in CSMA/CD
  • Frame structure: typically consists of:
    1. Preamble: a sequence of bits used to synchronize the receiver
    2. Destination Address: the address of the intended recipient
    3. Source Address: the address of the sender
    4. Data: the actual data being transmitted
    5. CRC (Cyclic Redundancy Check): a error-checking mechanism
    6. Frame Check Sequence (FCS): a 4-byte field used to detect errors
  • Frame length: typically limited to a maximum of 1518 bytes (IEEE 802.3 standard)

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Test your knowledge of the CSMA/CD protocol, including flow control, access methods, message encoding, and message encapsulation. Learn about the basics of this protocol and how it's used in network communication.

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