A customer uses multiple branch devices to connect with the USG_A device in the headquarters for IPsec connection, and uses point-to-multipoint IPsec and sub-policy to establish a VPN. Multiple branches have fixed IP addresses, most of the branches can communicate with the headquarters IPsec link normally, and the intranet (branch to headquarters) can communicate with each other, except that the intranet PC of one branch and the headquarters intranet can communicate with each other. can not communicate normally, but the IPsec VPN tunnel has been negotiated successfully.
What could be the reasons?

MAC authentication is applicable in which of the following situations?

The ISO27000 series includes several security standards, which of these standards are relevant to information security technology risk management:

According to the following networking, a customer uses the following configuration on the cleaning equipment. The following statement is correct:
ip route-static 0.0.0.0 0 10.1.2.1

Regarding the trigger mechanism of 802.1X authentication, which of the following descriptions are correct?