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The ACK flood attack is defended by the load check. The principle is that the cleaning device checks the payload of the ACK packet. If the payloads are all consistent (if the payload content is all 1), the packet is discarded.
Note: ACK Flood defense principle: First, when the ACK packet rate exceeds the threshold, start session check: (If the cleaning device checks that the ACK packet does not hit the session, there are 2 processing modes, (strict mode - - The strict mode is recommended in the network where the route is deployed. If the cleaning device does not check the established session, the device discards the packet. The basic mode: When the bypass is deployed, the device is cleaned before the session is established. The session is not detected. In this case, the basic mode is recommended. That is, when the ACK packet rate exceeds the threshold for a period of time, the session check is started. The device first passes several ACK packets to establish a session. Check the session to determine whether to discard the packet. Second, if the cleaning device checks the ACK packet to hit the session, check the session creation reason). The second is that the load check is performed by the cleaning device to check the payload of the ACK packet. If the payloads are all consistent (if the payload content is all 1), the packet is discarded. The third is to check the reason for the session creation if the cleaning device checks that the ACK packet hits the session. The fourth is if the session is by SYN or SYN-
If the ACK packet is built, the packet is allowed to pass. If the session is created by another packet (for example, an ACK packet), the packet inspection result is checked. The packet with the correct sequence number is allowed to pass, and the incorrect packet is discarded. The payload check can be enabled only if 'session check' is enabled, and the payload check is performed on the packets passed by the session check.
Based on the following information analysis on the firewall, which of the following options are correct?
In the TCP/IP protocol, the TCP protocol provides a reliable connection service, which is implemented using a 3-way handshake. First handshake: When establishing a connection, the client sends a SYN packet (SYN=J) to the server and enters the SYN_SENT state, waiting for the server to confirm; the second handshake: the server receives the SYN packet and must send an ACK packet (ACK=1) To confirm the SYN packet of the client, and also send a SYN packet (SYN=K), that is, the SYN-ACK packet, the server enters the SYN_RCVD state; the third handshake: the client receives the SYN-ACK packet of the server. Send the acknowledgement packet ACK (SYN=2 ACK=3) to the server. After the packet is sent, the client and server enter the ESTABUSHED state and complete the handshake. Regarding the three parameters in the 3-way handshake process, which one is correct?
Three physical interfaces have been added to the link-group group. When any one of the interfaces fails, what are the following descriptions correct?
To ensure the normal forwarding of large traffic, a network administrator of a company uses two firewalls to implement hot standby. As shown in the following figure, when the configuration is complete, it is found that when A of the two firewalls fails, the data stream being transmitted before the fault has been seriously lost, but the newly transmitted data stream can work normally after the fault. What could be the cause of this phenomenon?
