During the network acceptance test, it was found that the OSN 3500 can work normally when connected to an external clock source. When the external clock source is disconnected, it enters the hold state, but the hold state cannot last for 24 hours. Please explain the possible reasons.

• A.Access to external high-precision clock source time is too short
• B.Wrong clock level setting
• C.The clock SSM function is not enabled
• D.The clock crystal oscillator fails, and the board needs to be replaced

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TN55TQX+TN53NQ2 network element) -----TN53NQ2+TN55TQX (B network element) networking, the network element is a synchronous system, 10GELAN MAC transparent mapping mode, ALS function is turned on, and the connection with the router is normal. At this time, change the 55TQX 10GELAN mode of A network element to BIT transparent mapping mode, then what are the new alarms of A network element 53TQX (multiple choice)

• A.ALS_ACTIVE
• B.REM_SF
• C.REMOTE_FAULT
• D.ODU2_LOFLOM

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An organization has built a network with 20 subnets and class C IP addresses. What is the subnet mask that should be used to configure the network correctly?

• A.255.255.255.248
• B.255.255.255.224
• C.255.255.255.240
• D.255.255.255.192

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Regarding the description of OSS, what is wrong is

• A.U2000 supports multiple northbound interfaces such as SNMP, TL1, XML, CORBA, etc., which can realize rapid integration with the operator's OSS system.
• B.OSS system (Operation Support System) refers to a software system that provides operators with functions such as communication equipment performance management, inventory management, business management, and fault management.
• C.OSS system is mainly used to improve the work efficiency of equipment maintenance personnel.
• D.The network layer of OSS is above NMS, and NMS is generally used to realize the management function of network element equipment.

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The Tunnel-level APS protection of Hybrid MSTP equipment can support forced switching and locked switching, and the priority of forced switching is higher than that of locked switching.

• A.TRUE
• B.FALSE

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