11 Questions
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.
True
CSMA/CD-s juhindutakse pöördumiste asemel ACK-de otstarbel.
False
Põrgepuhvimeetodis võib mitu seadet samaaegselt edastada andmeid.
True
Match the following communication concepts with their descriptions:
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
Match the following communication protocols with their characteristics:
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
Match the following communication terms with their functions:
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
Match the following communication protocols with their purposes:
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
Match the following communication concepts with their applications:
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
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:
- Preamble: a sequence of bits used to synchronize the receiver
- Destination Address: the address of the intended recipient
- Source Address: the address of the sender
- Data: the actual data being transmitted
- CRC (Cyclic Redundancy Check): a error-checking mechanism
- 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)
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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