CSMA/CD Protokoll

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)

Description

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.