About the description of DHCP, which of the following statement is not correct?

• A.DHCP normal obtained addresses experienced message interaction are Discover, Offer, Request, ACK
• B.If the client discards the used IP address, then she uses DHCP RELEASE packet to notify the server, the server recovers this address for the next use.
• C.Discover packet is unicast packet between DHCP Relay and DHCP server
• D.DHCP servers in the network are not allowed to exist multiple at the same time, because it will lead to multiple servers answering at the same time, the client can't choose address

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In the PPP protocol, if the protocol field is set to 8021, which protocol does it indicate?

• A.IPX protocol
• B.IP protocol
• C.IPCP protocol
• D.LCP protocol

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The following description which is correct? MxU automatic update strategy, that is, when the device is powered on automatically, the device current version compared with the policy target version, if inconsistent, automatically device software version upgrade to the target version.

• A.False
• B.True

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1483B is encapsulated the MAC data frame in AAL5, 1483R is encapsulated the IP data frame in AAL5.

• A.True
• B.False

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ONT call emulation refers to the use of test modules instead of user phone call to test. When ONT POTS user cannot provide voice services, remote execute ONT call emulation test via OLT command to help the user diagnose whether the ONT POTS user call is normal. When ONT call emulation, ONT can be in offline status.

• A.True
• B.False

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