Ch. 14 Packet Flashcards
Which device takes a circuit and combines it with a few hundred other circuits into a single complex circuit on one wire?
Multiplexer
Which technology is used by multiplexers to separate individual voice calls by keeping every call in its own unique frequency range?
Frequency division multiplexing (FDM)
Which digital signal rate does a central office use to convert analog voice signals before multiplexing them into larger circuits?
DS0
Which device converts an analog signal to digital and a digital signal to analog?
Modulator-demodulator
How many copper wires are used by a T1 line?
two pairs
Which device connects to each end of a T1 connection?
CSU/DSU
Which digital signal rate is used by a T1 line?
DS1
Which digital signaling rate has a frame containing a framing bit and 24 channels where each channel holds a single 8-bit DS0 data sample?
DS1
What is the data transfer speed for DS1?
1.544 Mbps
How many channels are in a T1 bundle?
24
What is the European counterpart to a T1 line?
E1
What is the approximate total bandwidth of an E3 line?
34 Mbps
What is the low end speed of the SONET Optical Carrier specification (OC-1)?
51.8 Mbps
Which term refers to the first generation of packet-switching technology?
X.25
Which term refers to a technology that serves as a replacement for Frame Relay and ATM switching?
Multi-Protocol Label Switching (MPLS)
What is the range of transfer speed for ATM?
155.52 to 622.08 Mbps and beyond
What is the size of an ATM fixed-length cell?
53 bytes
Which test should a network administrator run on a CSU/DSU to test a WAN connection and verify the T-carrier connection from end to end?
BERT
Which phone line has a baud rate of 2,400 and uses an RJ-11 connector?
PSTN
Which device takes 8-bit-wide digital data, converts it into 1-bit-wide digital data, and then hands it to a modem for conversion to analog?
UART
What is the current modem standard now on the market?
V.92
When you install an ISDN terminal adapter (TA), what special number provided by the telephone company must be configured along with the other ISDN telephone number you want to call?
Service Profile ID (SPID)
Which statement describes an ISDN PRI?
ISDN PRI is a full T1 line, carrying 23 B channels.
Which terms refer to versions of DSL service?
SDSL and ADSL
Which term describes a DSL device that is located in a central office, connecting multiple DSL customers to the Internet?
DSLAM
What is the maximum distance between a user’s demarc and the central office for all versions of DSL?
18,000 feet
In the most common DSL connection, what device is connected to a telephone wall jack and to a standard NIC in your computer?
DSL modem
If you have cable Internet service, what protocol is used between the head end connection and the cable company’s network?
DOCSIS
Long Term Evolution (LTE) networks feature speeds (in theory) of up to __________ Mbps for downloads and 75 Mbps for uploads.
300
Which technology tries to bring usable Internet access to homes and businesses through the electrical power grid?
BPL
To make rollouts affordable, most fiber-to-the-home technologies employ a version of __________ architecture that uses a single fiber to the neighborhood switch and then individual fiber runs to each final destination.
PPPF
Which standard, developed by Citrix, is used with a remote terminal connection?
ICA
Which term refers to the standard used by the vast majority of VoIP solutions?
RTP
Which protocol is commonly used to stream video?
RTSP
