ISDN PRI uses ____ B channels and one 64-Kbps D channel.
____ is an updated, digital version of X.25 that also relies on packet switching.
d. Frame relay
An ad hoc arrangement would work well for a WLAN with many users.
At the customer’s demarcation point, either inside or outside the building, RJ-48 connectors terminate in a ____.
b. smart jack
____ may use either the 2.4-GHz or 5-GHz frequency range.
An 802.11g antenna has a geographic range of ____ meters.
On most modern WANs, a ring topology relies on ____ rings to carry data.
In the case of connecting two WLANs, access points could be as far as ____ feet apart.
To establish a satellite Internet connection, each subscriber must have a ____.
c. dish antenna
In wireless communication, to exchange information, two antennas must be tuned to the same ____.
In ____ wireless systems, the transmitting antenna focuses its energy directly toward the receiving antenna which results in a point-to-point link.
After SONET, BPL has the best maximum throughput available.
The portion of the PSTN that connects any residence or business to the nearest CO is known as the ____.
d. local loop
A ____ aggregates multiple DSL subscriber lines and connects them to the carrier’s CO.
If intermittent and difficult-to-diagnose wireless communication errors occur, ____ might be the culprit.
ATM is a WAN technology that functions in the Data Link layer.
What sets ATM apart from Ethernet is its ____ size.
a. fixed packet
A ____ converts digital signals into analog signals for use with ISDN phones and other analog devices.
b. terminal adapter
The average geographic range for an 802.11a antenna is ____ meters.
Dial-up ISDN does not convert a computer’s digital signals to analog before transmitting them over the PSTN.
The data rate of a particular SONET ring is indicated by its ____, a rating that is internationally recognized by networking professionals and standards organizations.
b. OC (Optical Carrier) level
WiMAX is defined by the IEEE 802.11 standard.
Because WAN connections require routers or other Layer 3 devices to connect locations, their links are not capable of carrying ____ protocols.
The speed of a T-carrier depends on its ____ level.
Wireless signals experience attenuation.
Broadband cable requires many subscribers to share the same local line, thus raising concerns about ____ and actual (versus theoretical) throughput.
In a star topology, a single connection failure will halt all traffic between all sites.
Wireless networks are laid out using the same topologies as wired networks.
In ____, a wireless signal splits into secondary waves when it encounters an obstruction.
____ is an 802.11n network feature allowing the combination of multiple frames into one larger frame.
b. Frame aggregation
A unique characteristic of the 802.11 data frame is its ____ field.
c. Sequence Control
____ is a significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.
A directional antenna issues wireless signals along a(n) ____ direction.
In ____ scanning, the station transmits a special frame, known as a probe, on all available channels within its frequency range.