单选题After 100 meters (328 feet), CAT6 cabling is known to experience which of the following symptoms?（）A Signal lossB Signal bleedC Data collisionD Crosstalk

A. 25 meters (82 feet)

B. 100 meters (328 feet)

C. 500 meters (1640 feet)

D. 1000 meters (3280 feet)

A. Signal loss

B. Signal bleed

C. Data collision

D. Crosstalk

The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the（）in hertz，and the（）on the channel

A．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal

An analog signal's characteristic quantity representing data may 66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68)elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70)number of well-defined discrete values that one of its characteristic quantities may take in time.

A．acquire

B．collect

C．assume

D．fetch

A. 33 Feet (10 meters)

B. 100 Feet (30 meters)

C. 328 Feet (100 meters)

D. 1200 Feet (366 meters)

A.1000Base-T

B.10GBase-SW

C.100Base-FX

D.100Base-TX

A. Upgraded copper lines allow maximum speed greater than cable

B. Signal is not shared back to the switch

C. Signal is shared back to the switch

D. Distance is not a factor in signal speed

In order to link data centers, a customer is evaluating the installation of fiber optic cable between buildings that are 400 meters apart. The installation will require multiple patch panels and cables.Which of the following is the most critical factor to consider for this installation?（）

A. I/O rate

B. bandwidth

C. signal loss

D. Dense Wavelength Division Multiplexing (DWDM)