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Which of the following is the function of Message 1 and Message 2 during IKEv1 phase-1 negotiation in main mode?

• A. Mutual identity authentication
• B. Negotiation of the IKE proposals used between peers
• C. Exchange of key-related information (materials used for key generation) using the DH algorithm and generation of keys
• D. IPsec SA negotiation

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Which of the following actions can be performed when the firewall identifies file anomalies?(Select All that Apply)

• A. Allow
• B. Alarm
• C. Block
• D. Delete attachment

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Sort the intrusion prevention steps in sequence based on the working mechanism of the firewall device.

Explanation:
Intrusion Prevention Systems (IPS) in firewalls follow amulti-step processto detect and mitigate threats. The steps occur in a logical sequence:
1##Step 1: Identifies and Parses Application-Layer Protocols
* The firewall firstidentifies the protocol being used(e.g., HTTP, FTP, DNS, SMTP).
* Parsing the protocol helps the IPS engineunderstand how the data is structuredand what types of attacks might be embedded.
* This step is crucial for detectingprotocol-based attackslike SQL injection or cross-site scripting (XSS).
2##Step 2: Reassembles IP Fragments and TCP Flows
* Attackers oftensplit malicious payloads across multiple packetsto evade detection.
* The firewallreassembles fragmented packets and TCP flowsto reconstruct the full data stream.
* This step is critical for detectingevasion techniques such as fragmented attacks or out-of-order packet attacks.
3##Step 3: Performs Signature Matching
* Once the full data stream is reassembled, the IPScompares it against known attack signatures.
* Signature matching helps detect:
* Malware patterns(e.g., botnets, Trojans).
* Exploits targeting vulnerabilitiesin software and operating systems.
* Firewalls usepredefined signature databasesthat are regularly updated.
4##Step 4: Performs the Response Action Based on the IPS Profile
* If an attack is detected, the firewall takes anaction based on the IPS policy:
* Block the traffic(drop malicious packets).
* Alert the administrator(generate logs and alerts).
* Rate-limit traffic(slow down potential attack sources).
* Theresponse mechanism is customizablebased on security requirements.

Which of the following protocols can be encapsulated through GRE over IPsec?(Select All that Apply)

• A. IPv6
• B. OSPF
• C. VRRP
• D. IPX

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Which of the following are components of Huawei's anti-DDoS solution?(Select All that Apply)

• A. Detecting center
• B. Management center
• C. Cleaning center
• D. Zone

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