H31-311_V2.5 Exam Questions

For the signal flow of the OSN8800 equipment OTM site, service sending direction: SDH siginals LSX M40V OBU1 Line.

Tunnel/VC are two types of labels in MPLS.

The encapsulation formats of TMD E1 service PWE3 mainly include SAToP mode and CESoPSN mode. The main difference lies in whether the structure and processing overhead of TDM signal...

SCC board can generate optical monitoring channel.

Both PDH and SDH have globally unified standards.

The information payload area stores only the information payload.

MS-AIS and MS-RDI belong to a group of warning information, and the generation of this alarm is related to both K1 and K2 bytes.

Establishing a fixed connection for data forwarding between the designated external physical port, VCRTUNK port and the designated LP port of the designated VB is called hanging.

Adjacent cascades can be converted into virtual cascades, but virtual cascades cannot be converted into adjacent cascades.

When the switch receives a data frame, it searches the MAC forwarding table based on the destination MAC address of the data frame. The result of the search is one or a group of po...

Light travels at different speeds in different media, and it appears as if different media hinder the propagation of light with different resistances.

The thickness, material and refractive index of the fiber core and cladding material have a decisive influence on the properties of the optical fiber.

Dynamic PW refers to a PW established through a signaling protocol. Currently, the main PW signaling protocol is RSVP-TE.

OTUk_UAS is the unavailable seconds of the optical transmission segment. Unavailable seconds refer to severe error seconds that last for more than 10 seconds. In this case, the una...

Both OTUk and ODUkP support obtaining LOF and LOM information by detecting FAS and MFRS overhead.

When setting the VLAN tag value, all ports of the same device should be configured with the same VLAN ID.

The first to third layers of the OSI reference model are called the bottom layer, also known as the medium layer. The bottom layer is responsible for data transmission in the netwo...

U-PTR is an indicator used to indicate the position of the information net load in the STM-N frame, so that the receiving end can correctly separate the information net load accord...

R-LOS alarm has nothing to do with overhead bytes but only with the input signal quality.

The SDH optical interface only scrambles the electrical signals.

ATM nr.m consists of a maximum of n optical channels multiplexed, r means simplified function (reduced), and non-associated overhead is not supported.

If the OTUk layer overhead is damaged, the board may report OTUk_SM_AIS to indicate the abnormal condition.

If a PW is carried by multiple PSN tunnels, this PW is called an MS-PW.

The DCC byte is mainly used to transmit OAM information and is the physical channel for transmitting OAM information.

The initial value of the Sequence number in the ETH PWE3 encapsulation frame format is randomly generated, and the value decreases by one each time a data packet is sent.

The single-fiber bidirectional wavelength division multiplexing system uses only one optical fiber to realize the simultaneous transmission of optical signals in two directions in...

The frame rate of STM-1, STM-4, STM-16, and STM-64 signals is the same 8000 frames per second.

B2 byte is similar to B1 byte. When a bit error is detected, it will be transmitted back to the other end in a timely manner.

The internal data forwarding table of the switch is based on source MAC learning.

If the virtual cascade group at one end of the device has LCAS enabled, but the other end has not enabled LCAS, the connection fails.

In the OTN mapping path, the ODUk signal can only be obtained by mapping the OPUk signal at the same level.

QINQ technology solves the problem of insufficient VLAN resources and provides L2 VPN that is cheaper than MPLS. Therefore, the application scenarios of QINQ are much wider than MP...

The channel frequencies allowed in G.692 are based on a reference frequency of 193.1 THz, and the channel spacings are 100 GHz, 50 GHz, and 25 GHz.

OptiX OSN3500 supports a variety of cross-boards. Depending on the board model, it provides 40G/80G/120G/200G high-order cross-capacity and 5G/20G/40G/120G low-order cross-capacity...

In OSN6800, the LDG board can realize the Ethernet Layer 2 scheduling function.

PDH is a quasi-synchronous digital system, which also belongs to the synchronous digital transmission system.

The optical amplifier unit can compensate for line loss and increase transmission distance. Through multi-stage cascading, the system transmission distance can be extended to infin...

VLAN division can prevent broadcast storms, improve network efficiency, and make the network more secure.

QinQ follows the technical standard IEEE802.1ad, and its emergence is mainly to solve the shortage of IPv4 addresses.

Tunnel is a mechanism for transparently carrying information on the network. It is used to carry PW. One Tunnel can carry one PW.

VLAN domain can isolate unicast messages of different users, and also isolate broadcast messages of different VLANs.

In the network interface of OTN, the network interface within the same operator is the intra- domain interface, which is further divided into the interface between equipment from d...

The cascading methods for mapping Ethernet services to SDH include adjacent cascading and virtual cascading.

When there is no frequency difference and phase difference between VC-4 and AU-4, and between VC-12 and TU-12, the AU-PTR value is 522 and the TU-PTR value is 70.

PWE3 is a processing mechanism that simulates the key attributes of a certain service and transmits it end-to-end on the PSN network through a tunnel (IP/MPLS).

In the integrated DWDM system, the transmitting light source must strictly comply with the G.693 optical port specifications.

A communication network is a system that interconnects geographically dispersed user terminal devices to achieve communication and information exchange. It is mainly composed of us...

For Huawei equipment, NODE ID is the unique identifier of the intelligent network element in the control plane. After the network is configured with intelligent services, the NODE...

The subnet mask of 255.255.255.248, according to the calculation formula, can accommodate 23 devices, or 8 devices.

MPLS label allocation is divided into static allocation and dynamic allocation. There is no allocation principle for statically allocated labels, as long as the values of each labe...