T/F: Dial-up ISDN does not convert a computer's digital signals to analog before transmitting them over the PSTN.
Because WAN connections require routers or other Layer 3 devices to connect locations, their links are not capable of carrying ____ protocols.
The portion of the PSTN that connects any residence or business to the nearest CO is known as the ____.
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.
At the customer's demarcation point, either inside or outside the building, T-carrier wire pairs terminate with a ____.
Broadband cable requires many subscribers to share the same local line, thus raising concerns about ____ and actual (versus theoretical) throughput.
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.
____ 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.
bus topology WAN
Occurs when each site is directly connected to no more than two other sites in a serial fashion.
star topology WAN
Contains a single site acting as the central connection point for several other points.
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.
Which of the following elements of the PSTN is most likely capable of transmitting only analog signals?
Which of the following WAN topologies comes with the highest availability and the greatest cost?
A customer calls your ISP's technical support line, complaining that his connection to the internet usually goes as fast as 128 Kbps, but today it is only reaching 64 Kbps. He adds that he has tried dialing up three different times with the same result. What type of connection does this customer have?
Suppose you work for a bank and are leasing a frame by frame relay connection to link an automatic teller machine located in a rural grocery store with your bank's headquarters. Which of the following circuits would be the best option, given the type of use this automatic teller machine will experience?
On an ISDN connection, what device separates the voice signal from the data signals at the customer permission?
D. Terminal adapter
You work for a regional common carrier and have been asked to design a passive optical network that will bring high-speed Internet access to a new neighborhood in a nearby suburb. The area served by the network will bring fiber- optic cable to as many as 45 households. At least how many ports on the carrier's OLT should you expect to configure?
You offer your networking expertise to a small nonprofit organization. The three employees each have a desktop computer and want to share the single broadband cable Internet connection that comes to their office. You donate a router you have sitting around to make this sharing possible. Where on the network should you install the router?
B. between the cable modem and the workstation
How does ATM differ from every other WAN technology described in this chapter?
D. It uses fixed- sized cells to carry data
You work for and Internet service provider that wants to lease a T3 over a SONET ring. What is the minimum Optical Carrier level that the SONET ring must have to support the bandwidth of a T3?
What technique does T1 technology use to transmit multiple signals over a single telephone line?
C. Time division multiplexing
The science museum where you work determines that it needs an Internet connection capable of transmitting and receiving data at 12 Mbps at any time. Which of the following T-carrier solutions would you advise?
C. Ten T1s
You're troubleshooting a problem with a T1 connection between your business and the service provider's facility. The t1 connection intermittently goes down. When you call the service provider for assistance, they say they will only engage one of their technicians after you have verified that all of your premises equipment is in working order. Given the requirements, which of the following do you not examine for faults?
D. The cable that enters your smart jack from outside your building
Your company has decided to order ADSL from its local telecommunications carrier. You call the carrier and find out that your office is located 17,000 feet from the nearest CO. Given ADSL's potential throughput and your distance from the CO, what is the maximum downstream throughput you can realistically expect to achieve through this connection?
Which of the following may limit a DSL connection's capability?
D. The distance from the customer to the carrier's switching facility
You have just started working for a regional network service provider. The company provides several T1s to businesses around your city. In addition, your company supplies Internet service to three ISPs, using multiple T1s. Two T3s connect your employer's data center with two even larger service providers. You notice a router in the data center that handles the multiple T1s and T3s. Which of the following routing protocols is this router almost certainly running to exchange rout information with routers on the other service provider's network?
A variation of DSL that offers more throughput when data travel downstream, downloading from a local carriers switching facility to the customer.
The characteristics of a transmission technology that affords greater bandwidth in one direction than in the other direction.
A transmission method in which data being transmitted and received by nodes do not have to conform to any timing scheme.
ATM (Asynchronous Transfer Mode)
A data link layer technology originally conceived in the early 1980s at Bell Labs and standardized in the 1990s.
BRI (Basic Rate Interface)
A variety of ISDN that uses two 64-kbps bearer channel and on 16-kbps data channel.
Bus Topology WAN
A WAN in which each location is connected to no more than two other locations in a serial fashion.
The fiber-optic or coaxial cable that connects a neighborhood cable node to a customers house.
A device that modulates and demodulates signals for transmission and reception via cable wiring.
CIR (committed information rate)
The guaranteed minimum amount of bandwidth selected when leasing a frame relay circuit.
CO (Central Office)
The location where a local or long - distance telephone service provider terminates and interconnects customer lines.
CSU (channel service unit)
A device used with T-carrier technology that provides termination for the digital signal and ensures connection integrity through error connection and line monitoring.
A combination of CSU and a DSU that serves as a connection point for a T1 line at the customers site.
The "data" channel is used to carry information about the call such as session initiation and termination signals, caller ID, call forwarding, and conference call signals.
A type of connection in which a user connects to a distant network from a computer and stays connected for a finite period of time.