Which of the following statements about the EFS4 board are correct? (Multiple choice).
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Correct Answer:
A, B
Q: 2
If the overhead bytes pass through two plugged backplane buses, then the two slots are called
paired slots that enable automatic transparent transfer of overhead bytes, such as (), () and (). Even if
the SCC on the local network element The board is offline, which can also improve msP switching
performance and protect DCC communication with other network elements. (Multi-quality
selection).
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Correct Answer:
A, B, C
Q: 3
What of the following operations may interrupt the network element service? (Multiple choice).
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Correct Answer:
C, D
Q: 4
A light wave has two independent and orthogonally polarized modes on the plane perpendicular to
the transmission direction, which are generally called X polarization and Y polarization respectively.
Using this property of optical signals, the polarization multiplexing separately modulates optical
signals on the two orthogonal polarizations.
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Correct Answer:
A
Q: 5
Which of the following is not a nonlinear effect?
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Correct Answer:
B
Q: 6
Which of the following is the default WTR time for MSP switching?
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Correct Answer:
B
Q: 7
Which of the following local maintenance endpoints can be used to manage MSTP devices?
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Correct Answer:
A
Q: 8
Which of the following are the main advantages of SDH?
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Correct Answer:
A, B, C, D
Q: 9
When performing fiber cut-off test on an ordinary MSP ring, which of the following alarms will be
reported? (Multiple choice).
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Correct Answer:
B, C
Q: 10
Which of the following is the main advantage of SDH? (Multiple choice).
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Correct Answer:
A, B, C, D
Q: 11
The MAC loopback and PHY loopback are used for fault location. When the MAC loopback is set to in
loop, the PHY loopback can be set according to the actual situation.
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Correct Answer:
B
Q: 12
PDM uses a polarization beam splitter to divide the laser into two vertical directions: x and y.
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Correct Answer:
A
Q: 13
QinQ technology can be used when multiple users need to share the same VCTRUNK and use the
same VLAN ID.
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Correct Answer:
A
Q: 14
Configuring the EPLAN service as a ring is not recommended. If the EPLAN service is configured as a
ring network, the STP protocol must be enabled on the network to prevent broadcast storms.
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Correct Answer:
A
Q: 15
For 100G (112Gbit/s) signals, the actual data baud rate is only 28G amplitude.
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Correct Answer:
A
Q: 16
On OSN Series transmission devices, ethernet ports cannot access tagged and untagged frames at
the same time
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Correct Answer:
B
Q: 17
The 1510nm optical monitoring channel can be effectively amplified after passing through EDFA.
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Correct Answer:
B
Q: 18
SES: There are 5% or more of the False blocks or at least one defect (OCI/AIS/LCK/IAE/LTC/TIM/PLM)
in one second.
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Correct Answer:
B
Q: 19
During service configuration, there are two time slot modes. Huawei uses interleaved time slot mode
by default.
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Correct Answer:
B
Q: 20
The scope of management of OMSn is the path from the input optical port on the multiplexer unit of
the sending site to the output optical port on the multiplexer unit of the receiving site, called the
optical multiplexing segment (OMS) path.
