The present disclosure discloses a message attack defense method and apparatus. The method includes: receiving, by a controller, a report message sent by at least one switch; respectively storing, by the controller in a switch queue corresponding to each switch, the received report message that is sent by each switch; and performing, by the controller, round-robin scheduling on the switch queue corresponding to each switch.

A control system includes a to-be-controlled apparatus disposed in a clean room, a control device disposed outside the clean room and controlling the to-be-controlled apparatus through Ethernet communication, and a conversion device disposed in the clean room and mutually converting communication data on Ethernet communication with the control device and communication data on serial communication with the to-be-controlled apparatus.

The present disclosure discloses a message attack defense method and apparatus. The method includes: receiving, by a controller, a report message sent by at least one switch; respectively storing, by the controller in a switch queue corresponding to each switch, the received report message that is sent by each switch; and performing, by the controller, round-robin scheduling on the switch queue corresponding to each switch.

A control system includes a to-be-controlled apparatus disposed in a clean room, a control device disposed outside the clean room and controlling the to-be-controlled apparatus through Ethernet communication, and a conversion device disposed in the clean room and mutually converting communication data on Ethernet communication with the control device and communication data on serial communication with the to-be-controlled apparatus.

A device may store a credit value for each of multiple output components. The device may receive packets from a network device via an input component. The device may cause the input component to queue the packets. The device may selectively dequeue a packet from the input component, to be sent to an output component, based on whether the credit value for the output component satisfies a credit threshold. The device may send the packet to the output component based on a destination of the packet when the packet is dequeued from the input component. The device may determine a size of the packet after the packet is dequeued. The device may update the credit value for the output component based on the size of the packet. The device may output the packet to another network device via the output component.

The invention provides for a download agent executing on a computing device to dynamically select between media files with different media quality for delivery of media content provided by a media content provider. The download agent may select between different media files with similar content but different quality based on a playback rate of the media file, the resolution of the media file, or the encoding scheme of the media file. The download agent may seamlessly transition from one media file to another media file at key frames to avoid any motion artifacts and to avoid requiring a user to restart the media file.