H31-311_V2.5 Exam Questions

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

Which of the following is the default WTR time for MSP switching?

When the J1 byte does not match, () alarm is reported and the service may be interrupted.

Which of the following can be configured as the monitoring time for network element performance events?

Which of the following is not an EVPLAN function?

Assume that two VC12 time slots need to be bound to VCTRUNK1 of the N2EFS4 board. When there are 8 V04 time slots on the N2EFS4 board, which of the following time slots meets the r...

Which of the following statements about signal label byte C2 is wrong?

Complex flow classification refers to classifying packets based on the ToS (Type of Service) field of IP packets, user priority, or the EXP field of MPLS packets to identify traffi...

Communication networks can be divided into local area networks, wide area networks, and metropolitan area networks between local area networks and wide area networks according to t...

U2000 client can be installed on Windows, Solaris and SUSE Linux operating systems.

The optical monitoring channel is established for monitoring the WDM optical transmission system. ITU-T recommends using a wavelength of 1510nm and a capacity of 2MHz/s.

Half-duplex mode must have a conflict detection and avoidance mechanism to prevent multiple devices from occupying the line at the same time. This mechanism is the so-called CSMA/C...

The most effective subnet mask in a point-to-point WAN link is 255.255.255.252.

Both QinQ and MPLS can provide users with L2 VPN services, but QinQ is cheaper and simpler than MPLS.

The frame structure of ODU4 is four times that of ODU1.

SDH equipment can judge the quality of the clock signal based on the S1 byte. The larger the S1 value, the higher the corresponding clock quality.

R-LOS, R-LOF, AU-AIS, and TU-AIS alarms are all generated and reported on the circuit board.

All bytes in the SOH frame structure will be scrambled.

Chromatic dispersion includes material dispersion and waveguide dispersion. Generally, only material dispersion and waveguide dispersion are considered in single-mode optical fiber...

QinQ technology can be explained as 802.1Q in 802.1Q. In other words, it is to add another layer of 802.1Q tag on top of the 802.1Q tag. The outer layer is C-VLAN and the inner lay...

SDH network is composed of multiple network nodes (network elements) interconnected by optical fibers; network topology generally refers to the shape of the network, that is, the g...

After mapping and multiplexing, 4 ODU2 signals can be multiplexed into 1 OTU3[V] signal. For ODU2e signals, only 3 signals are needed to be multiplexed into 1 OTU3[V] signal.

K1 and K2 bytes can transmit APS switching signaling and can also indicate the failure of the signal in the multiplexing segment.

QinQ technology is a VLAN nesting technology. QinQ complies with the IEEE 802.1q recommendation and is also a VLAN extension technology.

If bit errors occur in the SDH network, the service signal restored after decapsulation will definitely contain bit errors.

The comb filter is an active optical device whose main function is to couple or separate odd waves and even waves in the same band.

TM is a terminal multiplexer, and its functions are: the line end inputs/outputs one STM-N signal, and the branch port can output/input multiple low-speed branch signals.

The LAN physical layer is often used for the interconnection of routers and switches. Although it is called a LAN, if a 10GBase-LR or -ER optical module is used, the transmission d...

The maximum transmission distance of Ethernet depends on factors such as line quality and signal attenuation.

1000BaseSX uses single-mode optical fiber and light with a wavelength of 1300nm to transmit services.

The number of bytes in the segment overhead in the STM-1, STM-4, STM-16, and STM-64 frame structures is the same.

When OSN 3500 uses GXCSA, it supports 2 10G slots; when using EXCSA, it supports 4 10G slots.

The basic actions for label forwarding in MPLS networks are PUSH, SWAP, and PHP.

The transmission rate of STM-4 is constantly equal to 4 times the signal transmission rate of STM-1, and the transmission rate of STM-16 is constantly equal to 4 times that of STM-...

Compared with traditional SDH and SONET equipment, OTN has up to 6 levels of TCM monitoring capabilities.

According to the OUTk signal rate calculation formula: OTUk rate = 255/(239-k) x STM-N frame rate, the rate of the OTU4 signal is 255/235 x 99 532800 kbit/s.

Currently, 32-bit IP addresses are no longer sufficient, and MPLS labels are only 20 bits, so MPLS labels will not be sufficient as the network becomes larger.

Only external ports can set Tag attributes, internal ports cannot set Tag attributes.

The MAC address of a computer network card is uniformly assigned to each manufacturer by the IETF and is unique in the world.

PM overhead bytes are not processed at the electrical relay site, but SM overhead bytes need to be processed at the electrical relay site.

U2000 provides physical view, Layer 2 view, RPR view, IP view, cluster subnet and MPLS TE view, allowing users to browse from different perspectives.

Compared with the dense wavelength division multiplexing system, the sparse wavelength division multiplexing system greatly reduces the cost of the system and has very strong flexi...

A one-way loop means that the routes of service sending and receiving are inconsistent under normal network conditions. We call the service with separated routes a one-way service...

A local area network is a network formed by interconnecting various communication devices in a small area. Its characteristics are: short distance, low delay, high data rate and re...

In addition to positioning, the pointer can also accommodate differences in frame rate to a certain extent.

A subnet mask is a 32-bit address consisting of a string of 1s followed by a string of 0s, such as: 255.255.0.255 is a valid subnet mask.

The process from C4 to VC4 during the multiplexing process is rate adaptation.

In QinQ, the TPID values of the inner and outer labels of the device are both 0x8100 as specified in the protocol. This value cannot be changed. If it changes, the frame will be di...

For monitoring channels, OSC and ESC can coexist in one network.

HUB is a multi-port repeater. When HUB is the central device, if a line in the network fails, it will not affect the operation of other lines.