Which of the following bridges are used to forward data based on the MAC address and VLAN ID carried in the data?
In the OTN standard system, which of the following protocols defines optical transport network interfaces?
Suppose 2 VC-12 time slots need to be bound to the VCTRUNK1 of the N2EFS4 board. When there are 8 VC4 slots on the N2EFS4 board, which of the following slots meets the requirements?
For the devices that support multiple transmission rates and working modes, the____mechanism can be used to determine the optimal communication mode between two connected
devices. (Enter only lowercase letters.)
The 1510nm optical monitoring channel can be effectively amplified after passing through EDFA.
MSP is a network-level protection scheme. MSF does not directly protect services, and MSP switching and recovery are not affected even if there is no service on the MSP ring.
When the bridge uses IVL learning mode, an entry in the MAC address table is created based on the source MAC address and source port of the teach frame. This entry applies to all VLANs
Which of the following statements about the OTM-n .m and OTMnr .m for OTN are incorrect?
The interval between two adjacent pointer alignment events is at least () frames.
Which of the following statements about basic LCAS functionality are correct? (Multiple choice).
Which of the following is the functional unit that provides serial data for the interface and system associated with the orderwire phone?
The index is used to folio and delineate the starting position of VC-n in the corresponding AU or TU frame so that the receiving end can correctly remove the corresponding VC from the STM-N The VC and C packages are then separated into separate low-rate signals, such as PDH That is; Low-rate branch signals can be discarded directly from the STM-N signal
Which of the following maintenance signals is transmitted from the downstream site to the upstream site of the OTN?
Single-fiber bidirectional WDM systems use only one optical fiber to transmit optical signals in both directions at the same time. Light signals in both directions should be arranged at different wavelengths.
The frame structure of ODU4 is four times that of ODU1
The rate of STM-1 is ()bit/s.
There are 48 bits in MAC address. The first ( ) bits make up a unique identifier for the vendor and the last ( ) bits are allocated by the vendor
TU-AIS is often encountered during network maintenance. Which of the following alerts can trigger a TU-AIS alert? (Multiple choice).
On a Layer 2 switching device, if the Ethernet port is an Access port, the port can only receive Ethernet frames without a VLAN tag or Ethernet frames with the same VLAN ID as the default VLAN ID of the port.
Which of the following statements about overhead bytes is incorrect?
Which of the following device domains can be managed by U2000? (Multiple choice).
Which of the following modulation technologies has the best performance in terms of wavelength stability?
The rate of SF64 and SL64 boards is STM54. Therefore, the two plates can be interconnected.
The OPC board is an optical-layer platform board that must work with pluggable modules.
Which of the following different types of ESC are divided according to the principles of implementation? (Multiple choice)
NE A and NE B are adjacent NE
If B3 and low-order Falses occur in the A->B direction, and B1, B2, B3, and low-order Falses occur in the B->A direction, it is caused by Which of the following performance events does NEA report? (Multiple choice).
Subnetwork connection protection (SNCP) requires the APS protocol.
After signals are transmitted for a certain distance in a WDM system, the optical signal-to-noise ratio (OSNR) at the receive end decreases to a certain extent. Which of the following Is the main cause?
OChr means the use of electrical monitoring technology.
OTM nr.m consists of up to n " multiplexed channels and does not support non-channel-related overhead. The letter "r" indicates a decrease in functionality.
When setting up LCAS mode, follow these principles:
1. If both ends of the device are Huawei devices, please set it to "Standard Mode".
2. If a Huawei device is interconnected with a third-party device, set the interconnect device to the same mode according to the mode supported by the third-party device.
WDM transmits optical signals multiplexed at multiple rates (wavelengths) through a single optical fiber, and the digital signals carried by these optical signals must have the same rate and data format
For alignment; Indicates the starting position of VC-n in the corresponding AU or TU frame. • This way: The receiver can correctly remove the corresponding VC from STM-N, and then The VC and C packages are separated into separate low-rate signals, such as PDH, which means that the low-rate path signal can be dropped directly from the STM-N signal.
When the ACT indicator of the SDH board is off, it means that the board has a hardware failure and cannot be used.
Which of the following is the main networking type of a transmission network?
Which of the following statements about ODUk_PM_BDI is correct?
When configuring the SXCS single board for the OSN3500, which of the following is the access package of the fully configured substand?
When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)
After the U2000 sends configuration data to the network element, if the SCC single board authentication fails, the network element enters the installation state.
Both PDH and SDH have globally harmonized standards.
Which of the following alerts does not trigger an AU-AIS alert?
Which of the following alarm/event storage modes does U2000 support? (Multiple choice).
In WDM systems, it is ideal to use a dielectric thin film filter (TFF) when using less than () wavelengths.
Which overhead below 112 is not ODUk overhead?
Compared with dense wavelength division multiplexing (DWDM) systems, crude glass division multiplexing (CWDM) systems provide a certain amount of glass length and transmission distance within (kmkm), which greatly reduces system cost and has strong flexibility
When the SNCP ring consisting of four Optis OSN 2500 devices has a rate of 25 Gbt/s, the network's service answer stars can carry up to ()2Mt/s Signal.
Which of the following is the maximum number of OSN3500 sub-racks that can be installed in a 2.2-meter cabinet?
The backplane has two 48V power cords, and each board gets two -48V power supplies from the backplane. After combining the power supply via diodes, the various voltages required for each component are obtained by means of a DC/DC power module and a linear mane swap.
The OTUCn signal rate does not include the FEC overhead area.
Which of the following is the difference between an AU pointer and a TU pointer? (Multiple choice).
LCK insertion takes precedence over AIS insertion. That is, if the user configures LCK insertion and the conditions for automatic AS insertion are met, the LCK is inserted.
On the NMS system, the network element performance monitoring time is set to () minutes and () hours.
The difference between dispersion compensation fibers and ordinary optical fibers is that the dispersion compensation fibers have a negative dispersion coefficient at ().
According to ITU-T's recommendations, the requirement that the MSP switching time should be within 50ms is conditional. For example, the number of net elements on the entire ring network is less than 16.
The OTN signal has a fixed pad period, the same frame period as the SDH signal.
During service configuration, there are two time slot modes. Huawei uses interleaved time slot mode by default.
When the fiber between node A and node B is disconnected, the RU on node B detects OTS_LOS alarm and will OTS_BDI The ru of the alert inserted into node A of node A forces reports OTS BDI alarms. The board reports och_SSF alarm on the downstream C node.
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.
Forced switching, fiber switching, manual switching and motion switching are decreased in order of priority.
Which of the following are key technologies in a WDM system?
Which of the following statements about extending the ECC is incorrect?
You can view the NE license status and replace the license that is about to expire in a timely manner to prevent the impact of license expiration on services.
Which of the following statements regarding multiplexing partial remote False indication (MS-REI) is correct?
(1) B2 bytes indicate the transmission channel.
(2) The M1 byte represents the transmission channel
(3) THE MS-REl is sent from the receiver to the source.
(4) MS-REI is transmitted from the source to the receiver.
(5) Indicates the number of bit Falses detected by the receiver after receiving the MS signal.
The number of ODU2e signals multiplexed into the ODU3 signal is the same as the number of ODU2 signals multiplexed into the ODU3 signal.
The TNG1N401 board supports hybrid transmission of multiple ODUk granularities.
For MSPs, you need to set the MSP protocol ID for each NE. To ensure that each ID is unique, it is recommended to set the MSP protocol ID to the value that is compatible with the network element ID.
Which of the following is the electrical layer cost of OTN? (Multiple choice).
If you group SNCP services with the same source, sink, or route, you can increase the SNCP switching speed
When the sender detects that the b6-b8 of the K2 byte is 110, it means that the sender has reported an alarm ().
The working mode of the port determines the flow control mode of the port.
When the operating mode is 100Mbit/s full duplex, one of the following flow control modes can be used
NCE software is deployed in B/5 (browser/server) mode.
D1 to D12 are digital communication channel bytes. D1 to D6 are used in the regenerator section, and D7 to D12 are used in the multiplex section.
The refractive index n1 of the fiber core must be the Q of the cladding refractive Mo n2, which is a necessary condition for transmitting the optical signal in the optical fiber.