(single) Is the following description correct? Version rollback generally consists of three steps: 1. Load the original version of the package file; 2. Load the original version of the database backed up before the upgrade; 3. Reset the system.

• A.False
• B.True

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Which of the following does not belong to ONT product?

• A.HG510V
• B.HG8247
• C.HG8010
• D.HG8245

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In the message constitution mechanism of H248 protocol, what does belong to the smallest constituent unit?

• A.message
• B.command
• C.context
• D.transaction

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LAN is generally transmitted in the form of bus-based, the most commonly used protocol is carrier sense and collision detection CSMA/CD protocol.

• A.True
• B.False

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(Single) Is the following description correct? The method of determining whether the received broadcast frame is received by the computer in the local area network is to determine whether the source MAC address of the frame is the same as the hardware address of the local machine.

• A.False
• B.True

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