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When examining data at the physical layer, we're most often concerned with:
The most general, or generic, term used to describe all sorts or changes in a signal during propagation is:
Which of the following is relatively immune to small errors?
The term used to describe a length of UTP wiring is a ________.
In the UTP wiring used in LANs, how many wire pairs are there in a cord?
In 4-pair UTP, what is twisted?
The wires in each pair are twisted around each other.
Which transmission medium will you most often find is used for the wired access line between a host and the switch that serves the host ?
A signal grows weaker as it travels along media; this is called ________.
A high signal-to-noise ratio reduces ________ errors.
In Ethernet, limiting UTP cord runs to 100 meters normally limits ________ to an acceptable level.
Both attenuation and noise errors
In most versions of Ethernet, what is the maximum cord length allowed by the standard?
A fluorescent light could cause errors in a UTP transmission. We would describe this problem as ________.
When one pair in a UTP cord interferes with signals in other pairs, this is ________.
Twisting wires reduces ________.
Both interference and crosstalk interference
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________.
terminal crosstalk interference
The main benefit of parallel transmission over serial transmission is ________.
Which type of transmission is more widely used today?
UTP categories rate the ________ of cabling.
Cat 5e and Cat 6 wiring can carry Ethernet traffic 100 meters up to ________.
Which form of UTP can carry 10 Gbps signals 100 meters?
Optical fiber uses ________ signaling.
In optical fiber, light travels through the ________.
In optical fiber, we measure light in terms of ________.
ADSL is popular for home users because it:
can allow high download speeds and acceptable (nominal) upload speeds at the same time
Compared with UTP, optical fiber is ________ expensive to buy and install today when all costs of purchasing and installation are considered.
In LANs, optical fiber typically is used in ________.
For full-duplex transmission, optical fiber normally uses ________.
Coaxial cable media is most often used in this type of network.
LANs normally use ________.
Why is multimode fiber used instead of single-mode fiber for LAN transmission?
The access link between a business and the nearest telephone company is referred to as the:
What is a typical core diameter for multimode fiber?
When the light energies of multiple pulses overlap, this is ________.
Modal bandwidth is a measure of ________.
multimode fiber quality
Single mode fiber has a core diameter of ________.
Multimode fiber distance is limited primarily by ________.
The lowest-speed leased lines (under 2 Mbps, such as T1 (1.544 Mbps)) use ________.
two-pair data-grade UTP
Which of the following already runs to nearly all customer premises and is used with ADSL service?
1-pair VG UTP.
In ADSL, the residential customer needs ________.
an ADSL modem
For their transmission medium, cable television companies primarily use ________ for the drop cable.
thin coax cable
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