Practice Tests / HCNA / H12-721
HCNA
H12-721 HCIP-Security-CISN
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Practice questions are provided in English to match the language commonly used in IT certification exams.
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VendorHCNA
CodeH12-721
Duration90 Minutes
Questions240 refs
Exam facts
Objective-based preparation without unauthorized content
Certification metadata is preserved from the legacy QZ9 catalog. Questions remain English-only.
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Practice questions are provided in English to match the language commonly used in IT certification exams.
Question 1
DDos attacks work through the network to the target (usually a server, such as DNS server, WEB server) and sends a small amount of abnormal packets of non-traffic, so that the attacked server parses the message, causing the system to crash or become busy.
Question 2
In the TCP / IP protocol, TCP protocol provides reliable connectivity service using three-way handshake to achieve. The first handshake: establish a connection, the client sends a SYN packet (SYN = J) to the server, and enter SYN_SENT state, waiting for the server to confirm. Second handshake: the server receives a SYN packet and must issue an ACK packet (ACK = ) to confirm the client's SYN packet, but he is sending a SYN packet (SYN = K), ie, SYN-ACK packets, the server enters SYN_RCVD state. Third handshake: the client receives the SYN-ACK packet, the server sends an acknowledgment packet ACK (SYN = ASK = ), this package has been sent, the client and server enter into the ESTABLISHED state, completing the three-way handshake. About three-way handshake during the three parameters, which of the following statements is correct?
Question 3
The IKE first stage main mode negotiation process includes the following information? (Choose three answers)
Question 4
In-Band management and port management control information and business information is transmitted on the same channel.
Question 5
ESP verifies only the IP payload in NAT traversal, but the ESP port information will be encrypted causing the layer 4 information to be unusable with PAT. Using the IPsec NAT transparency feature can solve this problem, the ESP packet is encapsulated in a UDP header and contains the information necessary to enable PAT to work.
