H12-721 Exam Dumps : Huawei Certified ICT Professional - Constructing Infrastructure of Security Network

Accessing the headquarters server through the IPSec VPN from the branch computer. The IPSec tunnel can be established normally, but the service is unreachable. What are the possible reasons?

The static fingerprint filtering function is to defend the attack traffic by configuring a static fingerprint to process the packets that hit the fingerprint. Generally, the anti-DDoS device capture function can be used to input fingerprint information to static fingerprint filtering.

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?