The AAC address consists of 46 bits. It is globally unique. Which of the following is the meaning of a MAC address whose eighth bit is 1?

• A.Unicast address
• B.Double-click the address
• C.Broadcast address
• D.Multicast address

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The path that data packets pass through in an MPLS network is called a label switching path (LSP). Which of the following descriptions about LSP is wrong?

• A.Like Ingress, there is only one Egress in an LSP, and both are LERs
• B.Ingress is the starting node of LSP, an LSP can only have one Ingress
• C.Transit is the intermediate node of LSP. Its main function is to look up the label forwarding information table and complete MPLS packet forwarding through label switching.
• D.Transit is an intermediate node of LSP, and its position in LSP is indispensable

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The parameter () is usually used to measure the impact of bit errors on transmission quality

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Loopback is a common operation for routine maintenance and troubleshooting. Which of the following statements about loopback operations are wrong? (Multiple choice)

• A.Hardware loopback is the loopback of the optical port and the electrical port with a pigtail and a self-loop cable.
• B.After the inner loopback is executed, the signal flows to the outside of the WDM network element
• C.After performing the outer loopback, the signal flows to the inside of the WDM network element
• D.It is necessary to consider increasing the optical attenuation when performing hardware loopback operation on the optical port

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What are the source functions of the OTUk layer? (Multiple choice)

• A.Perform BIP-8 calculations
• B.Write SM, GCC, FAS, MFAS and other bytes
• C.Finally generate a complete OTUk frame structure
• D.Overhead bytes written to the OTUk layer

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