Data Communications And Computer Networks – Flashcards

Unlock all answers in this set

Unlock answers
question
means that users can specify telephone numbers that are allowed to get through
answer
Call filtering
question
means that a user calling into a company telephone system provides some form of data by speaking into the telephone, and a database query is performed using this spoken information.
answer
Integrated voice recognition and response
question
After the 1984's Modified Final Judgment, the long-distance telephone companies became known as
answer
interexchange carriers (IECs or IXCs)
question
The local loop commonly consists of either four or ____ wires
answer
eight
question
Because DSL is an always-on connection, it uses a ____ circuit instead of a switched circuit
answer
permanent
question
means that users utilize a single desktop application to send and receive e-mail, voice mail, and fax
answer
Unified messaging
question
is a packet-switched network that was designed for transmitting data over fixed lines
answer
Frame relay
question
means that users have the ability to control a call—for example, set up a conference call—without being a part of it
answer
Third-party call control
question
is capable of sending traffic that may experience bursts of data, but there are no promises as to when the data may be sent
answer
Unspecified bit rate (UBR)
question
The telephone network consists of two basic types of telephone lines: a subscriber loop, or standard telephone line, and a
answer
trunk
question
is the most expensive ATM class of service
answer
Constant bit rate (CBR)
question
As long as a telephone call remains within a LATA (a(n) ____ call), the telephone call is local and is handled by a local telephone company
answer
intraLATA
question
The Telecommunications Act of 1996 mandated that the existing local telephone companies, now called ____, must give CLECs access to their telephone lines
answer
incumbent local exchange carriers (ILECs)
question
handles all in-house calls and places calls onto outside telephone lines
answer
private branch exchange (PBXs)
question
MPLS and VPNs continue to replace which long-distance data services?
answer
frame relay and ATM
question
The designation layer ____ protocol means that frame relay technology is only one part of a network application and resides at the data link layer
answer
2
question
The ____ standard is a 56,000-bps dial-up modem standard approved by a standards-making organization rather than a single company
answer
V.90
question
is the earliest form of DSL.
answer
High bit-rate DSL (HDSL)
question
A ____ service is an all-digital connection that can transfer either voice or data at speeds up to 1.544 Mbps
answer
T-1
question
A(n) ____ is a service from local telephone companies in which up-to-date telephone facilities at the telephone company's central (local) office are offered to business users, so that they don't need to purchase their own facilities.
answer
central office exchange service
question
On the other end of the local loop is the local telephone company's
answer
central office
question
are permanent direct connections between two specified points
answer
Tie lines
question
is a packet-switched network that was designed for transmitting data over fixed lines
answer
Frame relay
question
Digital subscriber line comes in a variety of formats. Often collectively referred to as
answer
xDS
question
Before ATM can transfer any data, you must first create a logical connection called a
answer
virtual channel connection (VCC)
question
A(n) ____ connection has a faster downstream transmission speed than its upstream speed
answer
asymmetric
question
is a format in which the transfer rate can vary, depending on noise levels within the telephone line's local loop
answer
Rate-adaptive DSL (RADSL)
question
means that different icons on a computer screen represent common PBX functions such as call hold, call transfer, and call conferencing, making the system easier for operators to use.
answer
PBX graphic user interface
question
The ____ allows the customer to exceed the committed information rate by a fixed amount for brief moments of time
answer
burst rate
question
A(n) ____ connection is one in which the transfer speeds in both directions are equal
answer
symmetric
question
When a VCC transmits network management and routing signals, it is called the
answer
network-network interface
question
is a popular format that transmits the downstream data at a faster rate than the upstream rate
answer
Asymmetric digital subscriber line (ADSL)
Get an explanation on any task
Get unstuck with the help of our AI assistant in seconds
New