An administrator can view the IPSec status information and debugging information as follows. What is the most likely fault?

The Tracert packet attack is an ICMP timeout packet returned by the attacker when the TTL is ____, and the ICMP port unreachable packet returned when the destination address is reached to find the path through which the packet arrives at the destination. Spying on the structure of the network

After the NAT server is configured (no-reverse parameter is added), the firewall automatically generates static Server-Map entries. The first packet matches the Server-Map entry and does not match the session table.

On the USG, you need to delete sslconfig.cfg in the hda1:/ directory. Which of the following commands can complete the operation?

When using the Radius server to authenticate users, (the topology is as shown below), not only must the username and password be stored on the Radius server, but the username and password must also be configured on the firewall.

The server health check mechanism is enabled on the USG firewall of an enterprise to detect the running status of the back-end real server (the three servers are Server A, Server B, and Server C). When the USG fails to receive the response from Server B multiple times. When the message is received, Server B will be disabled and the traffic will be distributed to other servers according to the configured policy.

In which of the following cases, IKE negotiation cannot use the main mode?

Which of the following is correct about the configuration of the firewall interface bound to the VPN instance?

USG dual-machine hot standby must meet certain conditions and can be used below. What are the following statements correct?

Connecting the internal network interface address from the firewall By pinging the internal network address of the peer, the IPSec tunnel can be successfully triggered. The internal PC cannot trigger the tunnel establishment. What are the possible reasons?

The enterprise network is as shown in the figure. On the USG_A and USG_B, hot standby is configured, and USG_A is the master device. The administrator wants to configure SSL VPN on the firewall so that branch employees can access the headquarters through SSL VPN. Which virtual gateway address should the SSL VPN be?

The ip-link principle is to continuously send ICMP packets or ARP request packets to the specified destination address, and check whether the ICMP echo reply or ARP reply packet of the destination IP response can be received.

An attack source will spoof the server and send a large number of SYN-ACK packets to the attacking target network or server. If the destination port of the packet is the TCP service port of the attacked server, the TCP protocol stack of the server will be abnormal. What is it?

In the active/standby mode of the USG dual-system hot backup, the service interface works at Layer 3, and the upstream and downstream routers are connected. The administrator checks that the USG_A state has been switched to HRP_M[USG_A] and the USG_B state is also HRP_M[USG_B]. What are the most likely reasons?

Networking as shown in the figure: PC1--USG--Router--PC2. If PC1 sends a packet to PC2, what are the three modes for the USG to process fragmented packets?

What type of message is the VRRP hello message?

An administrator can view the IPSec status information and Debug information as follows. What is the most likely fault?

What are the three elements of an abnormal flow cleaning solution?

Which of the following attacks is a SYN Flood attack?

In the IDC room, a USG firewall can be used to divide into several virtual firewalls, and then the root firewall administrator generates a virtual firewall administrator to manage each virtual firewall.

USG A and USG B are configured with a static BFD session. The following is true about the process of establishing and tearing down a BFD session.

When configuring the USG hot standby, (assuming the backup group number is 1), the configuration command of the virtual address is correct?

IPSec NAT traversal does not support IKE main mode, aggressive mode IP address + pre-shared key mode authentication, because pre-shared key mode authentication needs to extract the source IP address in the IP address to find the pre-shared key corresponding to this address. . The address change caused by the presence of NAT prevents the device from finding the pre-shared key.

Because the policy in the traffic limiting policy does not restrict the deny rule, you do not need to use the deny rule.

The virtual firewall forwards multiple instances. The firewall has multiple routing tables and forwarding tables. The addresses are overlapped and are implemented on the same configuration interface. Users with configuration rights can configure and view all data.

A data flow has established a session in the firewall. If the packet filtering policy corresponding to the data is modified, how should the firewall execute?

Man-in-the-middle attacks are: the middleman completes the data exchange between the server and the client. In the server's view, all messages are sent or sent to the client. From the client's point of view, all messages are also sent or sent.

DDoS is an abnormal packet that an attacker sends a small amount of non-traffic traffic to the attack target (usually a server, such as DNS or WEB) through the network, so that the attacked server resolves the packet when the system crashes or the system is busy.

An administrator can view the status of the device components by the following command: The status of the Slot3 board is Abnormal. What are the possible causes of the following faults?