CCNA: Signal Transmission and Frequency

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What is the primary function of a Balun in a transmission system?

To filter out noise in a signal

To connect two parallel transmission lines

To convert a single-ended signal to a differential signal (correct)

To amplify the signal in a transmission line

Which type of transmission line consists of two parallel wires closely spaced and separated by air?

Open-wire transmission line

Coaxial transmission line

Parallel-wire transmission line (correct)

Dual shielded transmission line

What is the term for the unwanted signal interference between two adjacent cables?

Longitudinal current

Crosstalk (correct)

Common mode rejection

Attenuation

What is the unit of measurement for the loss of signal strength in a cable per 100 meters?

dB Signup and view all the answers

What type of material is used to coat Plenum-grade cables to make them fire-resistant?

Teflon Signup and view all the answers

What is the term for the area between the ceiling and the roof in a single building or between the ceiling and the floor of the next higher level in a multistory building?

Plenum Signup and view all the answers

What type of coaxial cable is easier to construct, install, and maintain?

Rigid-air filled coaxial Signup and view all the answers

What is the characteristic impedance of a transmission line used to express?

The attenuation and phase shift per unit length of a transmission line Signup and view all the answers

What is the phenomenon where current flows through an isolated round wire, causing a magnetic flux?

Skin effect Signup and view all the answers

Why is the air insulator in CCNA cables kept relatively free of moisture?

To minimize losses Signup and view all the answers

What is the purpose of delay lines in transmission lines?

To introduce a time delay in the path of an electromagnetic wave Signup and view all the answers

What is the type of connector that can be easily twisted on or off?

Bayonet mount Signup and view all the answers

What is the purpose of a transmission-line stub?

To locate an impairment in a metallic cable Signup and view all the answers

What is the characteristic of a Stripline?

It is a flat conductor sandwiched between two ground planes Signup and view all the answers

What is the term for the ratio of the maximum voltage to the minimum voltage of a standing wave on a transmission line?

Standing Wave Ratio (SWR) Signup and view all the answers

What is the purpose of a quarter-wavelength transformer?

To match transmission lines to purely resistive loads Signup and view all the answers

What is the term for the luminous discharge that occurs between the two conductors of a transmission line when the difference of potential between them exceeds the breakdown voltage of the dielectric insulator?

Corona voltage Signup and view all the answers

What is the term for a technique that can be used to locate an impairment in a metallic cable?

Time-domain reflectometry (TDR) Signup and view all the answers