Introduction to CSMA/CD
CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection, in German: carrier detection multiple access with collision detection. It's about a Minutes to regulate data transmission in Ethernet networks in order to detect and minimize collisions.
Basics of network technology
Ethernet networks
Ethernet is a widely used transmission method in local networks (LANs). In an Ethernet network, multiple devices can communicate with each other at the same time communicate. Around the Make communication efficient and collisions, control mechanisms are required.
collision detection
Collisions occur when two or more devices are in the same room Network send data at the same time. In such cases they can data damaged or lost. To prevent this, CSMA/CD was developed.
How CSMA/CD works
CSMA/CD consists of three main components:
Carrier Sense
Before a device receives data via the Network sends, it checks whether the transmission channel is free. If the channel is busy, the device waits until the channel is available again.
Multiple Access
In a CSMA/CD network, all devices have equal access to the transmission channel. Every device can data send as soon as the channel is free.
Collision detection
Despite carrier detection, collisions can occur. In this case, the device involved detects the collision and sends a special collision signal to the others Devices on the network to inform.
The CSMA/CD algorithm
The backoff algorithm
After a collision is detected, the devices involved apply the so-called backoff algorithm. A random waiting time is calculated before a new transmission attempt is made. This minimizes the likelihood of further collisions.
Advantages of CSMA/CD
Some advantages of CSMA/CD are:
- Efficient use of network resources, as devices only transmit when the channel is free.
- Equal access to the transmission channel for all devices.
- Fast collision detection and fix by the back off algorithm.
- Scalability of the network, as the protocol also works in larger networks.
Disadvantages of CSMA/CD
However, CSMA/CD also has some disadvantages:
- In Networks with high utilization can it too increased collisions occur, which can affect performance.
- CSMA/CD is less efficient in wireless networks, because collision detection is more difficult.
- With the introduction of switches and full duplex connections CSMA / CD has become less relevant in many modern Ethernet networks.
Areas of application of CSMA/CD
CSMA/CD was mainly used in classic Ethernet networks that work with coaxial cables and hubs. In modern Networking with switches and full duplex connections, CSMA/CD is less relevant as collisions are avoided by the improved infrastructure.
Development and future of CSMA/CD
Although CSMA/CD is less common in modern Ethernet networks, it remains an important part of networking history. The principles of CSMA/CD pave the way for more advanced ones Technologies such as Wi-Fi and full-duplex Ethernet.
Summary and Conclusion
CSMA/CD is a Protocol used in Ethernet networks for regulation for data transmission and to avoid collisions. Despite some disadvantages, CSMA/CD offered efficient and equal use of network resources and has led to Development modern network technologies contributed.
FAQ
1. What does the abbreviation CSMA/CD mean?
CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection.
2. How does CSMA/CD work?
CSMA/CD consists of carrier sense, multiple access and collision detection Data transmission to regulate in Ethernet networks and avoid collisions.
3. What is it? difference between CSMA/CD and CSMA/CA?
While CSMA/CD detects and corrects collisions, CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) attempts to avoid collisions in the first place by making a kind of reservation of the transmission channel before sending. CSMA/CA is commonly used in wireless networks used like Wi-Fi.
4. Why is CSMA/CD less relevant in modern Ethernet networks?
In modern Ethernet networks are switches and full duplex connections are common. These technologies prevent collisions at the infrastructure level, making CSMA/CD less relevant.
5. What role does the back off algorithm play in CSMA/CD?
The back off algorithm is used when a collision has been detected. The devices involved costs easily a random waiting period before attempting to send again. This reduces the likelihood of further collisions.
