What is the main function of the physical layer?

• A.Responsible for the physical and electrical interface between user equipment and network end equipment
• B.A retransmission mechanism responsible for error detection and information
• C.Establish and clear a network-wide connection between two transport protocol entities
• D.Provide a reliable information transfer mechanism

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Which of the following detection methods can locate the fault point of LSP?

• A.CC
• B.MPLS Ping
• C.ZMPLS Tracert
• D.LT

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Which of the following protections are protected by electrical layer double transmission and selective reception?

• A.ODUK ring network protection
• B.SW SNCP Protection
• C.Client side 1+1 protection
• D.ODUK SNCP Protection

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Which of the following statements about switches and how they work is correct?

• A.The network managed by the switch belongs to a broadcast domain
• B.Learning based on the source MAC address and forwarding based on the destination MAC address
• C.When the destination MAC in the received Ethernet frame is not in its own address table, broadcast the frame to all ports
• D.Use the address aging mechanism to maintain the MAC address table

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In Optix PTN, what kind of MPLS Tunnel APS protection is supported?

• A.1:1 double-ended protection
• B.1:1 single-ended protection
• C.1+1 single-ended protection
• D.1+1 double-ended protection

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