以太网CSMA/CD协议模拟实验代码
时间: 2023-10-01 20:03:43 浏览: 52
以下是以太网CSMA/CD协议模拟实验的代码示例:
```python
import random
class Ethernet:
def __init__(self, num_nodes, packet_size, bandwidth, distance):
self.num_nodes = num_nodes
self.packet_size = packet_size
self.bandwidth = bandwidth
self.distance = distance
self.nodes = []
self.transmitting_nodes = []
self.collision_nodes = []
for i in range(num_nodes):
self.nodes.append(Node(i, self))
def run(self, num_packets):
for i in range(num_packets):
transmitting_nodes = []
for node in self.nodes:
if node.is_transmitting():
transmitting_nodes.append(node)
if len(transmitting_nodes) > 1:
for node in transmitting_nodes:
node.collision()
self.collision_nodes = transmitting_nodes
continue
elif len(transmitting_nodes) == 1:
transmitting_nodes[0].complete_transmission()
else:
self.collision_nodes = []
transmitting_node = self.get_next_transmitting_node()
if transmitting_node:
transmitting_node.start_transmission()
def get_next_transmitting_node(self):
idle_nodes = []
for node in self.nodes:
if not node.is_transmitting():
idle_nodes.append(node)
if len(idle_nodes) == 0:
return None
return random.choice(idle_nodes)
def get_propagation_delay(self):
return self.distance / (2 * 10**8)
def get_transmission_time(self):
return self.packet_size * 8 / self.bandwidth
class Node:
def __init__(self, id, ethernet):
self.id = id
self.ethernet = ethernet
self.transmitting = False
self.transmitting_start_time = None
def start_transmission(self):
self.transmitting = True
self.transmitting_start_time = self.ethernet.get_propagation_delay()
def complete_transmission(self):
self.transmitting = False
self.transmitting_start_time = None
def is_transmitting(self):
return self.transmitting
def collision(self):
self.transmitting = False
self.transmitting_start_time = None
if __name__ == '__main__':
ethernet = Ethernet(num_nodes=10, packet_size=1000, bandwidth=10**7, distance=1000)
ethernet.run(num_packets=100)
```
在这个实验中,我们模拟了一组节点在共享以太网上发送数据包的行为。节点轮流尝试发送数据包,如果有多个节点同时尝试发送数据包,则发生冲突。在这种情况下,所有正在发送数据包的节点都停止发送。如果只有一个节点正在发送数据包,则该节点将成功发送数据包。如果没有节点正在发送数据包,则下一个节点将开始发送数据包。
在这个实验中,我们使用了 Python 的类和对象来表示以太网和节点,并使用随机数来模拟节点之间的竞争。
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