T/F: In a star topology, a single connection failure will halt all traffic between all sites.
T/F: Dial-up ISDN does not convert a computer's digital signals to analog before transmitting them over the PSTN.
T/F: ATM is a WAN technology that functions in the Data Link layer.
T/F: SONET specifies framing and multiplexing techniques at the Physical layer.
T/F: The PPTP VPN tunneling protocol is based on technology developed by Cisco.
WANs typically send data over ____ available communications networks.
The individual geographic locations connected by a WAN are known as ____.
Because WAN connections require routers or other Layer 3 devices to connect locations, their links are not capable of carrying ____ protocols.
On most modern WANs, a ring topology relies on ____ rings to carry data.
The portion of the PSTN that connects any residence or business to the nearest CO is known as the ____.
A PSTN offers ____ security.
____ is an updated, digital version of X.25 that also relies on packet switching.
In a process called ____, two 64-Kbps ISDN B channels can be combined to achieve an effective throughput of 128 Kbps.
A ____ converts digital signals into analog signals for use with ISDN phones and other analog devices.
ISDN PRI uses ____ B channels and one 64-Kbps D channel.
The speed of a T-carrier depends on its ____ level.
At the customer's demarcation point, either inside or outside the building, T-carrier wire pairs terminate with a ____.
A ____ aggregates multiple DSL subscriber lines and connects them to the carrier's CO.
Broadband cable requires many subscribers to share the same local line, thus raising concerns about ____ and actual (versus theoretical) throughput.
What sets ATM apart from Ethernet is its ____ size.
SONET's extraordinary ____ results from its use of a double-ring topology over fiber-optic cable.
The data rate of a particular SONET ring is indicated by its ____, a rating that is internationally recognized by networking professionals and standards organizations.
____ networking refers to dialing directly into a private network's or ISP's remote access server to log on to a network.
____ is the preferred communications protocol for remote access communications.
____ is the standard for connecting home computers to an ISP via DSL or broadband cable.
____ virtual computing allows a user on one computer, called the client, to control another computer, called the host or server, across a network connection.
______ are connections between network nodes that, although based on potentially disparate physical links, logically appear to be direct, dedicated links between those nodes.
A(n) ____________________ uses TDM (time division multiplexing) over two wire to divide a single channel into multiple channels.
____ encapsulates incoming Ethernet or token ring frames, then converts them into ATM cells for transmission over an ATM network.
____________________ is the remote virtual computing software that comes with Windows client and server operating systems.
________ is an open source system designed to allow one workstation to remotely manipulate and receive screen updates from another workstation.
Refers to the T-carrier's Physical layer electrical signaling characteristics as defined by ANSI standards in the early 1980s.
Occurs when data travels from the customer to the carrier's switching facility.
Occurs when data travels from the carrier's switching facility to the customer.
bus topology WAN
Occurs when each site is directly connected to no more than two other sites in a serial fashion.
Provides equal capacity for data traveling both upstream and downstream.
Occurs when downstream throughput is higher than upstream throughput.
star topology WAN
Contains a single site acting as the central connection point for several other points.
mesh topology WAN
Incorporates many directly interconnected sites.
tiered topology WAN
Contain sites that are connected in star or ring formations are interconnected at different levels, with the interconnection points being organized into layers to form hierarchical groupings.