EMT Practice Test

1. Question Content...

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Question1: The Erbium Doped Fiber Amplifier (EDFA) is a key component of the new-generation optical communication system. Which of the following are the features of the EDFA? (Multiple Choice)

Question2: Which of the following are the service board types of MSTP devices? (Multiple Choice)

Question3: The EPL service exclusively uses bandwidth on the line, which is highly secure. It is applicable to the private line application of VIP customers.

Question4: The fiber core refractive index n1 must be ( ) the cladding layer refractive index n2, which is a necessary condition for transmitting optical signals in optical fibers.

Question5: A MAC address consists of 48 bits and is globally unique. Which of the following is the meaning of the MAC address whose eighth bit is 1?

Question6: When a working PQ1 board is faulty, the device performs TPS protection switching. Which of the following statements about the switching process are correct? (Multiple Choice)

Question7: During the service configuration between two adjacent sites (NE1 and NE2), if VC4:1 and VC12:l-3 are used on the NEl's line board connected to NE2, the same VC4 and VC12 timeslots must be used on the NE2's line board connected to NE1.

Question8: The SP3D board supports 63 El services.

Question9: When the rate of an SNCP ring consisting of four OptiX OSN 2500 devices is 2.5 Gbit/s, the service capacity of this network can carry a maximum number of ( ) 2 Mbit/s signals.

Question10: Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?

Question11: The OSN 1500/2500/3500/7500 supports both DC and AC power inputs.

Question12: In ITU-T G.692 recommendations, the allowed channel frequency is based on the reference frequency ( ) and the channel spacing can be 100 GHz, 50 GHz, or 25 GHz.

Question13: Which of the following is not a non-linear effect?

Question14: Which of the following statements about an MSP ring are correct? (Multiple Choice)

Question15: Which of the following communication protocols are used for DCN management on Huawei devices?
(Multiple Choice)

Question16: When the LCAS function is used/ which of the following overhead bytes are used to transmit control information? (Multiple Choice)

Question17: The SL64 board can be used in an OSN 2500.

Question18: When a fiber cut test is performed on a normal MSP ring, which of the following alarms is reported?
(Multiple Choice)

Question19: Which of the following is the basic requirement of a DWDM system on a light source?

Question20: For 100G (112 Gbit/s) signals, the actual data baud rate is only 28G baud.

Question21: Which of the following clock working modes support the ITU-T G.781 standard? (Multiple Choice)

Question22: Which of the following can be the center wavelengths of the pump sources in an EDFA? (Multiple Choice)

Question23: Which of the following is the functional unit that provides the interfaces related to the orderwire phone and serial data for the system?

Question24: If the overhead bytes pass through the backplane bus between two slots, the two slots are called paired slots.
Paired slots implement automatic transparent transmission of overhead bytes, such as (),(), and (). This improves MSP switching performance and protects DCC communication with other NEs even if the SCC board on the local NE is offline. (Multiple Choice)

Question25: Optical fiber loss includes the bending loss, absorption loss, and scattering loss.

Question26: Which of the following overheads is not an ODUk overhead?

Question27: Which of the following can be configured as the monitoring time of NE performance events?

Question28: On the NMS, the NE performance monitoring time is set to () minutes and () hours,

Question29: Which of the following statements about OTN advantages is incorrect?

Question30: In the Windows operating system, the log files of the U2000 program are stored in the ( ) directory of the U2000 installation drive.

Question31: Which of the following are optical-layer trails? (Multiple Choice)

Question32: The rates of the SF64 and SL64 boards are both STM-64. Therefore, the two boards can be interconnected.

Question33: Which of the following statements about the EFS4 board are correct? (Multiple Choice)

Question34: Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?

Question35: Which of the following are the steps for multiplexing low-speed services into high-speed SDH services?
(Multiple Choice)

Question36: When LMSP is configured, there are two switching modes: single-ended switching and dual-ended switching.
The protection protocol does not need to be enabled for single-ended switching.

Question37: In the case of MSP, you need to set the MSP protocol ID of each NE. To ensure that each ID is unique, you are advised to set the MSP protocol ID to the same value as the NE ID.

Question38: The single-fiber bidirectional WDM system uses only one optical fiber to transmit optical signals in two directions at the same time. The optical signals in the two directions should be arranged at different wavelengths.

Question39: On a Layer 2 switching device, if the Ethernet port is an Access port, the port can receive only the Ethernet frames without VLAN tags or Ethernet frames with the same VLAN ID as the default VLAN ID of the port.

Question40: Which of the following overhead bytes needs to be processed at an electrical regeneration site?

Question41: SDH signals must be scrambled before being transmitted over optical fibers. Which of the following bytes are not scrambled? (Multiple Choice)

Question42: When multiple users need to share the same VCTRUNK and use the same VLAN ID, the QinQ technology can be used.

Question43: For the (local) HA solution where the active and standby servers are deployed in the same place, which of the following platforms can be deployed? (Multiple Choice)

Question44: OTM nr.m consists of a maximum of "n" optical multiplexing channels and does not support non-channel-associated overheads. The letter "r" indicates function reduction.

Question45: The management scope of an OMSn is the path from the input optical port on a multiplexer unit at the transmit site to the output optical port on a demultiplexer unit at the receive site, which is called an optical multiplexing section (OMS) path.

Question46: If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, the half-duplex and full-duplex modes may be interconnected.

Question47: The standard Ethernet frame length should not be less than 64 bytes. Which of the following factors cause this limitation? (Multiple Choice)

Question48: Which of the following are communication quality alarms? (Multiple Choice)

Question49: Which of the following service levels cannot be selected during service configuration?

Question50: Which of the following is the impact of changing the NE ID of OSN 3500 on the NMS?

Question51: Which of the following operations may interrupt NE services? (Multiple Choice)

Question52: Which of the following is the maximum number of OSN 3500 subracks that can be installed in a 2.2 m cabinet?

Question53: The PRBS can be used to test whether an SDH service is normal and whether the protection switching function is normal.

Question54: When the lower-order resources of a device are insufficient, which of the following measures can be taken?
(Multiple Choice)

Question55: Which of the following ITU-T recommendations defines the OTN frame structure?

Question56: In MSP networking, when optical fibers are connected between sites, the east optical board of a site is connected to the west optical board of the downstream site, and these sites are connected in sequence to form a ring. In this case, the direction from the east optical board of a site to the west optical board of the downstream site is the major ring direction, and the direction that the ring is formed is the service direction.

Question57: Which of the following are the main advantages of SDH?
(Multiple Choice)

Question58: In an OSN 550, the CXL slot houses a functional board that integrates the system control and communication (SCC) unit, cross-connect unit, and clock unit. The functional board is available in multiple types depending on the functions and access capabilities provided by the OSN 550.

Question59: Automatic laser shutdown (ALS); When no optical signal is received, the ALS function automatically shuts down the corresponding optical module. This function protects onsite maintenance personnel.

Question60: The working mode of a port determines the flow control mode of the port. When the working mode is 100 Mbit/s full duplex, which of the following flow control modes can be used?

Question61: After an optical fiber is connected according to the networking diagram, if a critical alarm is reported on the optical port, the SRV indicator on the line board is red.

Question62: Which of the following are the differences between AU pointer and TU pointer? (Multiple Choice)

Question63: Which of the following statements about U2000 license is incorrect?

Question64: The SNCP switching speed can be improved if you classify the SNCP services that have the same source, sink, or route into groups.

Question65: Linear MSP (LMSP) has two modes; 1+1 and 1:1. Extra services can be configured for the protection channel only in the 1:1 mode of LMSP.

Question66: The coherent receiver technology uses the local oscillator laser that has the same frequency as received signals to perform coherent processing and recovers the ( ) information from the received signals. (Multiple Choice)

Question67: Which of the following is not an EVPLAN feature?

Question68: By default, the B2-EXC alarm is reported when the number of B2 bit errors exceeds the ( ) threshold.

Question69: In a WDM system, using a dielectric thin film filter (TFF) is ideal when fewer than ( ) wavelengths are used.