When LOATOA/THA/TOMTOG and other single board services are activated, the client-side interface of this end reports a SYNC alarm. What is the reason?
- A . The client-side interface on this end receives light abnormally, and the client-side interface on the other end receives light abnormally
- B . The client-side interface on this end receives light normally, but the client-side interface on the other end receives light abnormally
- C . The port receives light normally, and the client-side port receives light normally
- D . The client-side interface on this end receives light abnormally, while the client-side interface on the other end receives light normally
The single-fiber bidirectional optical interface of the PTN equipment distinguishes upstream and downstream business flows based on time slots.
- A . TRUE
- B . FALSE
Which of the following descriptions of the networking requirements for configuring SOM is wrong?
- A . OSC board must be configured in the network
- B . The outbound optical amplifier at the OMS segment must be equipped with an MCA board
- C . An OA board must be configured between the FIU board and the ROADM board or the splitter/combiner board at the receiving end of the OMS segment
- D . Optical amplifier boards of the same dimension can be inserted into different network elements
Regarding the differences between Linux and Solaris operating systems, which of the following statements is wrong?
- A . All disks need to be recognized by the operating system, but Solaris needs to be set in the sd.conf file, while Linux does not need
- B . Solaris itself only supports UFS hard disk file system; in Linux, there are many disk file systems to choose from, the default is ext3
- C . In Solaris, hot-plug devices are managed through cfgadm-. In Linux, when a device is connected, the system automatically recognizes and configures the hot-plug device.
- D . Linux comes with the fssnap command for creating and managing file system snapshots. Solaris does not have such a file system snapshot tool
Which of the following is not included in the performance evaluation of WDM network?
- A . Single-wavelength optical power & flatness
- B . OSNR
- C . Combined optical power
- D . Monitoring signal optical power
- E . Dispersion & FEC BER
In the 40-wavelength system of wavelength division equipment, due to the aging of the customer’s optical cable, the optical cable between sites 2# and 3# needs to be replaced, and a 4# optical amplifier site needs to be added between 2# and 3#. Which of the following statements are correct?
- A . The optical power of site 2# does not need to be re-adjusted
- B . The optical power of site 3# does not need to be re-adjusted
- C . It is necessary to consider whether the dispersion budget is sufficient
- D . No need to consider whether the dispersion budget is sufficient
Which of the following statements is wrong when creating an upgrade task?
- A . The upgrade operator must use the "admin" level user to perform the health check, otherwise some check items will fail and reduce the check efficiency.
- B . For gateway NEs, if you check the "If the NE to be loaded is a gateway NE, force FTP/SFTP protocol to load" configuration item, you need to configure an FTP/SFTP server on the network management server. Improve loading speed
- C . “Force and activate.” In this mode, all groups are activated in parallel, which may cause service interruption.
- D . Check "Use package customization. The software added by the user is a partial package. That is, it is matched according to the single board on the network element. It can improve the efficiency of adding."
Which of the following descriptions of ODUk SNCP protection type is wrong?
- A . When the protection subtype is "SNC/I, there is no need to set the OTN overhead. However, when configuring this type of protection, both ends of the service must be within the range of SM overhead monitoring;
- B . The protection subtype is "SNC/S": monitors the PM layer and needs to set the OTN overhead;
- C . For boards that require ODUk SNCP protection and electrical cross-connection, the configuration varies depending on the selected board and customer-side services;
- D . The ODUk SNCP protection configuration of the receiving site needs to be consistent with the ODUk SNCP protection configuration of the sending site;
Which of the following statements about the position of the dispersion module in the signal flow is wrong?
- A . If there is an OAU board, the DCM is placed between the TDC/RDC of the OAU
- B . If there is only one OBU board, the DCM is placed after the OBU
- C . If there are two OBU boards, the DCM is placed between the two OBUs.
- D . OTM station usually pre-fills 20KM DCM before sending OBU
In general, which PHB is used for signaling?
- A . CS7, CS6
- B . EF
- C . BE
- D . AF1, AF2, AF3, AF4
A network is configured with an optical line protection group. The initial difference between the primary and standby input optical signals is 2db, and the primary and standby input optical difference switching threshold is 5db. Which of the following situations will trigger switching?
- A . Main channel optical power minus standby channel optical power = 4db
- B . Main channel optical power minus standby channel optical power = -4db
- C . Main channel optical power minus standby channel optical power = -2db
- D . Main channel optical power minus standby channel optical power = 2db
Network elements A, B, and C are OSN 3500s that form a chain network. The two AIC stations are connected to routers. The IPR router is connected to the OptiX SDH equipment through the STM-1 POS port. The PAS port also uses 1 and C2 bytes as payload transfer bytes (for carrying services). VC4 services are created from network element A to network element C, and VC4 is passed through network element B.
In this case, is there any alarm reported inside the SDH network?
- A . No alarm
- B . There is a C2 mismatch alarm
- C . There is a J1 mismatch alarm
- D . There is a C2 not installed alarm
The maximum dispersion tolerance of an OTU board is 800ps/nm. On a G.652 fiber, the dispersion-limited distance can be roughly considered to be?
- A . 40KM
- B . 60KM
- C . 80KM
- D . 10KM
1NE1 is interconnected with NE2. NE1 uses OptiX SDH equipment and uses a VC4:1:2 timeslot. If the service can be opened normally, what is the VC12 timeslot number that the other end needs to use when using equipment from other manufacturers?
- A . 2-1-1
- B . 1_2_1
- C . 1_1_2
- D . 2_2_1
Which of the following statements about TTX board is correct?
- A . Essentially, the TTX board is not a 100G tributary board, but it requires a single-slot 100G cross-connect capacity.
- B . 8800T64/T32 universal subrack can support TTX boards
- C . This board is a tributary board that can access 100G client-side services
- D . TTX can be used with NS4 to make ODU4 particles electrically cross-linked
In a point-to-point WDM networking scenario, the signal-to-noise ratio of a single channel is low, while other channels are normal. What is the reason for this being impossible?
- A . The optical power of the OTU board corresponding to this wave at the transmitting end has decreased
- B . The fiber pigtail attenuation from the OTU board corresponding to this wave to the combiner increases
- C . Increased attenuation on the optical path
- D . The gain slope of the amplifier changes
In what order do the downstream signals flow through the functional blocks of the SL16 circuit board?
- A . SPI, RSE, MST, MSP, MSA, HPT
- B . HPT, MSA, MST, RST, SPI
- C . SPL, MST, RST, MSP, MSA, HPT
- D . HPI, MSP, MSA, MST, RST, SPI
If both the bidirectional OA and OSC report a loss of light alarm in a WDM network, which is the most likely cause?
- A . One-way interruption of line optical fiber
- B . The line optical fiber is interrupted in both directions
- C . Unidirectional degradation of line fiber
- D . Bidirectional degradation of line optical fiber
If the LED on the SCC board of OSN 8800 T32 shows a value of 11, which of the following subrack ID information does it represent?
- A . Secondary subrack
- B . No. 1 slave rack
- C . No. 11 slave rack
- D . No. 17 slave rack
Which of the following descriptions about branch SNCP protection is wrong?
- A . When configuring a branch SNCP, you need to set the SNCP subtype.
- B . The crossover granularity is GE or Any signal
- C . Trigger conditions are: board not in place, SF, SD
- D . Branch SNCP protection uses the dual-transmit and selective-receive function of electrical layer crossover to protect the customer-side services accessed by the branch board.
Which of the following descriptions about branch SNCP protection is wrong?
- A . When configuring a branch SNCP, you need to set the SNCP subtype.
- B . The crossover granularity is GE or Any signal
- C . Trigger conditions are: board not in place, SF, SD
- D . Branch SNCP protection uses the dual-transmit and selective-receive function of electrical layer crossover to protect the customer-side services accessed by the branch board.
Which of the following descriptions about branch SNCP protection is wrong?
- A . When configuring a branch SNCP, you need to set the SNCP subtype.
- B . The crossover granularity is GE or Any signal
- C . Trigger conditions are: board not in place, SF, SD
- D . Branch SNCP protection uses the dual-transmit and selective-receive function of electrical layer crossover to protect the customer-side services accessed by the branch board.
Which of the following descriptions about branch SNCP protection is wrong?
- A . When configuring a branch SNCP, you need to set the SNCP subtype.
- B . The crossover granularity is GE or Any signal
- C . Trigger conditions are: board not in place, SF, SD
- D . Branch SNCP protection uses the dual-transmit and selective-receive function of electrical layer crossover to protect the customer-side services accessed by the branch board.
Which of the following descriptions about branch SNCP protection is wrong?
- A . When configuring a branch SNCP, you need to set the SNCP subtype.
- B . The crossover granularity is GE or Any signal
- C . Trigger conditions are: board not in place, SF, SD
- D . Branch SNCP protection uses the dual-transmit and selective-receive function of electrical layer crossover to protect the customer-side services accessed by the branch board.
TOA board is a high-speed service tributary processing board. The following is the description of TOA (STND) board. Which one is wrong?
- A . When the client-side service is STM-16, the port working mode is ODU1 non-aggregation mode, and there is no need to configure the board complete cross
- B . When the client-side service is FE, the port working mode is ODU1 aggregation mode, and the board needs to be configured for complete cross
- C . When the client-side service is GE, the port working mode is ODUO non-aggregation mode, and the board needs to be configured for complete cross
- D . The maximum cross-connect capacity of a TOA board is 20Gbit/S
When considering the dispersion distance in a DWDM 10G system, which distance should be considered?
- A . Distance between adjacent sites
- B . Total distance of the entire network
- C . Electrical regeneration distance
- D . All of the above are wrong
Which of the following is not a single-layer board?
- A . Optical Add/Drop Multiplexing Board
- B . Optical monitoring channel board
- C . Spectral analysis board
- D . Business processing board
When congestion occurs, there are many different queuing strategies. If you need to serve the first-arriving packets first, you can use the () queuing strategy; if you want to ensure that the most urgent and critical services are served first, you can use the () queuing strategy; if you need to balance the delay and delay jitter of each flow, you can use the () queuing strategy; if you want to provide dedicated bandwidth for specific services , you can use the () queuing strategy.
- A . FIFO, PQ, WFQ, CQ
- B . FIFO, CQ, PQ, WFQ
- C . WFQ, PQ, CQ, FIFO
- D . PQ, FIFO, WFQ, CQ
Which of the following features can adjust bandwidth on demand when Ethernet networking is used, dynamically increase and decrease members in VCTRUNK without affecting services? When a virtual cascade group member fails, the bandwidth can be quickly adjusted to ensure normal data transmission; when the failed member recovers, the original bandwidth of the virtual cascade group is automatically restored.
- A . LCAS
- B . LAG
- C . DLAG
- D . QoS
In SDH networks, the S1 byte is used to transmit synchronization status information. Which of the following S1 byte values represents the G811 recommended clock?
- A . Ox00
- B . Ox02
- C . Ox04
- D . Ox0b
- E . OxOf
The new TN55ND2 board of the OSN8800 equipment was found to be unable to go online. Which of the following reasons are impossible?
- A . The master controller has a SWDL AUTOMATCH_INH alarm
- B . The master controller has a SWDL_PKG_NOBDSOFT alarm
- C . The master controller has a SWDL CHGMNG_NOMATCH alarm
- D . The master controller has a SWDL_BD WEAKMATCH alarm
Which of the following protections does N3EGS2 support?
- A . TPS
- B . PPS
- C . BPS
- D . DLAG
When using a dual slot line group MSP ring, in which of the following cases is the multiplex section overhead K bytes in the pass-through state?
- A . Cross-connect board abnormality
- B . Main control board abnormality
- C . The main control board is not in place
- D . When the multiplex section protocol controller state is pass-through
If a ROADM site adopts WSS+RMU configuration, which of the following impacts on SOM is wrong?
- A . If RMU is used locally to add wavelengths and has optical amplifiers, the OSNR value of the wavelength in the through direction detected by the SOM will deviate from the actual value
- B . There is an optical amplifier but no filter locally. The full-wave noise of the local optical amplifier affects the OSNR of the wavelength in the pass-through direction.
- C . The source and sink optical amplifiers of the optical cross-connect at this site must be in the same network element.
While expanding the existing network wave distribution system, which of the following performances do not need to be evaluated?
- A . PMD parameters of the link
- B . Optical power of OTU/OA
- C . BER of OTU before error correction at the receiving end
- D . Optical power flatness at the receiving end (with MCA)
Which of the following descriptions of the 1+1 protection features on the client side is wrong?
- A . OTU client optical layer dual transmission and selective reception
- B . Protect the OTU board and OCh fiber by occupying two wavelengths for protection and using different routes for transmission
- C . Working and protection wavelengths must be the same
- D . Long application time and wide protection range
After replacing the single master control, the new master control software is inconsistent with the previous faulty master control software. Which alarm may be triggered by the network element damage?
- A . SWD_PKGVER_MM
- B . SWDL_INPROCESS
- C . SWDL_CHGMNG_NOMATCH
- D . SWDL_PKG_NOBDSOFT
Which of the following does not belong to simple flow classification?
- A . VLAN PRL
- B . ACL
- C . MPLS EXP
- D . IP DSCP
Back-to-back OTM sites, three new relay wavelengths are added. The schematic diagram is as follows. Which of the following statements is wrong?
- A . No impact on OTM site up and down services
- B . The input optical power of the optical amplifier board does not need to be adjusted
- C . No further adjustment is required for the VOA on the relay wavelength
- D . The VOA of the upper wave does not need to be adjusted
Which of the following descriptions of electrical layer protection ODUk SNCP and branch SNCP is different?
- A . Cross-grain
- B . Scope of protection
- C . Protecting Subtypes
- D . Working Principle
In the Linux system, configure an IP address 129.9.1.100 for the network card Eth0. Which of the following command is used?
- A . ifconfig eth0 129.9.1.100
- B . ipconfig 129.9.1.100
- C . ipconfig eth0 129.9.1.100
- D . ifconfig 129.9.1.100
What network problems can’t QoS solve?
- A . Business single width
- B . Delay jitter in transmission
- C . Packet loss rate
- D . Transmission resources
Which of the following is an error in the system OSNR commissioning?
- A . Adjust the single wave group first, and then adjust the main line optical power
- B . One of the principles for adjusting the OSNR flatness of the MPIR point system: After the system power is determined, the OSNR flatness of the MPI-R point is tested by a spectrometer. If the OSNR flatness does not meet the standard (OSNR flatness index s21B), it needs to be adjusted.
- C . The combiner is an M40V board. "Look at the receiving end and adjust the transmitting end". While ensuring that the optical power flatness meets the index requirements, the optical power flatness can be sacrificed to ensure the flatness of OSNR (or BER).
- D . APE automatically adjusts the optical power of each channel to ensure the flat optical power at the receiving end, thereby ensuring the flatness of OSNR
NSF (Non-Stop Forwarding) means that when a certain type of device failure occurs, data forwarding is still performed normally to protect the key services on the network. In which of the following scenarios will the NSF function fail to perform data forwarding normally?
- A . XCS board hard reset (XCS board has 1+1 protection)
- B . Soft reset of the service processing board
- C . Hard reset of the service processing board
- D . XCS board soft reset (XCS board has no protection)
When planning a 1+1 HSB, corresponding planning principles should be followed. Which of the following are not planning principles for HSB?
- A . If the protection type is recovery, it is recommended to set the waiting recovery time to 5 to 12 minutes. The recommended setting is the default value of 10 minutes.
- B . It is recommended to enable reverse switching to prevent invalid RDI switching at the transmitting end due to signal fading.
- C . It is recommended to set "Alarm reporting mode" to "Protection group reporting only"
- D . Although 1+1 HSB has no restrictions on the slots of the IF boards, it is still recommended that the master and backup IF boards be installed in the dual slots.
The insertion loss of the 40 split-wave channels of D40 is 6dB. Without considering the influence of noise, when the signal is full, the optical power of the IN port of D40 is X dBm. If the optical power of the IN port is decreases by 1dB, the measured value of one of the output ports is 6dBm. (Assuming that the optical power of each channel is balanced, lg40=16)
- A . (X-5)
- B . (X-6)
- C . (X-22)
- D . (X-23)
The IP address you use is 165.247.52.119, and the subnet mask is 255.255.240.0. Which subnet is your host on?
- A . 165.247.52.0
- B . 165.247.32.0
- C . 165.247.56.0
- D . 165.247.48.0
In order to achieve the specified synchronization quality requirements, corresponding requirements must be made for the synchronous transmission network, and certain networking rules must be followed during network planning. Which of the following is wrong?
- A . In one clock transmission direction, the number of stations between transit office clocks cannot exceed 30.
- B . The number of switching station clocks cannot exceed 10
- C . The total number of devices in one direction cannot exceed 60
OptiX OSN 1800 is a compact multi-service optical transport platform. Which of the following descriptions is wrong?
- A . Does not support 158802 transmission and does not support external time signal access
- B . Single channel maximum rate 10Gbit/s (OTU2)
- C . The OptiX OSN 18001 chassis provides a total of 4 service board slots
- D . The OptiX OSN 180011 chassis provides a total of 8 service board slots
Which of the following statements about the reporting of OTUk_BDI alarm is wrong?
- A . Only the WDM side port will report OTUk_BDI
- B . The downstream station’s corresponding OTU board receives OTUk_AIS
- C . The downstream station’s corresponding OTU board receives OTUk_TIM
- D . The downstream station’s corresponding OTU board receives OTUk_SSF
When the PTN equipment EX2 board is connected to the STM-64 port, how should the working mode of the interface be set?
- A . Self-negotiation
- B . Adaptive
- C . LAN
- D . WAN
- E . Unable to connect
During the network acceptance test, it was found that OSN 3500 could work normally when connected to an external clock source, and entered the hold state when disconnected from the external clock source. However, the hold state could not last for 24 hours. Which of the following are the possible reasons?
- A . The time of accessing the external high-precision clock source is too short
- B . The clock SSM function is not enabled
- C . Clock level setting error 70200
- D . The clock crystal oscillator fails and the board needs to be replaced
Which of the following statements is wrong about the test items of IEEE 1588V2 time protection function?
- A . The active and standby states of the clock board and cross-connect board on the OptiX OSN 8800 are related to each other. When performing a switchover test, it is recommended to only switch the cross-connect board or the clock board.
- B . The active and standby states of the clock board and cross-connect board on the OptiX OSN 6800 are related to each other. When performing a switchover test, it is recommended to only switch the cross-connect board or the clock board.
- C . Test the long-term stability of the time performance in PTP synchronization mode. The output time performance should be within ±1us.
- D . For the long-term jitter test of the physical layer synchronization mode, a time analyzer with a GPS receiver is used to observe at the node for more than 8 hours. The test output time performance should be within ±1us.