Is the following description correct? The VDSL2 standard specifies a frequency band division of up to 30MHz, which can realize 100Mbit/s high-speed data transmission in a symmetrical uplink and downlink within a short distance.

• A.False
• B.True

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Which of the following are not features of smart vlan?

• A.A Smart VLAN can contain multiple uplink ports and multiple service virtual ports
• B.There are two types of ports: uplink port and service virtual port
• C.Under the same VLAN, the service flow between service virtual ports can be used for Layer 2 intercommunication
• D.Smart VLAN is mainly used to distinguish users, each user has a VLAN.

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What are the management protocols running between the OLT and the ONT in the GPON network?

• A.OMCI
• B.DHCP
• C.HGMP
• D.OAM

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When performing FTTx networking and data planning, user security needs to be considered. Which of the following measures can prevent attacks between users?

• A.Use anti-mac to solve
• B.Defense IP spoofing
• C.Layer 2 isolation and controlled mutual access of users
• D.Use port physical information to identify users

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At which layer does the ATM protocol work?

• A.Link layer
• B.Network layer
• C.Transport layer
• D.Physical layer

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