Unit 12 Quiz & Think Critically

10 September 2022
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question
What is the lowest layer of the OSI model at which LANs and WANs support the same protocols?
answer
Layer 3
question
An organization can lease a private _________________ that is not shared with other users, or a _________________ that can be physically configured over shared lines in the carrier's cloud.
answer
dedicated line, virtual circuit
question
What kind of device can monitor a connection at the demarc but cannot interpret data?
answer
Smart jack
question
What kind of network is the PSTN?
answer
Circuit-switched
question
How many channels are in an ISDN PRI connection?
answer
23B+D
question
What specifications define the standards for cable broadband?
answer
DOCSIS
question
______________ in SONET are analogous to the ________________ of T-carriers.
answer
OC levels, digital signal levels
question
Which DSL standard has the fastest speeds immediately outside the CO?
answer
VDSL
question
What method does a GSM network use to separate data on a channel?
answer
TDMA (Time-division multiple access)
question
Where does an MPLS label go in a PDU?
answer
Between Layers 2 and 3
question
What are two types of virtual circuits?
answer
PVC (permanent virtual circuit) and SVC (switched virtual circuit)
question
What are three examples of Layer 2 LAN or PAN standards that also function at Layer 1?
answer
Answers may vary. Examples might include Ethernet, USB, Wi-Fi, and Bluetooth.
question
What information is typically included in a Layer 1 frame?
answer
A start symbol or short preamble, a length field, the Layer 2 payload, and possibly a marker to end the frame
question
Which ISDN channel carries signaling information?
answer
The Bearer channel (or B channel)
question
What two types of modulation does DSL use to carry data?
answer
Amplitude & phase modulation
question
What device must be installed on a DSL network to protect the sound quality of phone calls?
answer
A splitter
question
What type of network combines fiber with coax?
answer
HFC (hybrid fiber coaxial)
question
What is the maximum capacity of a T1 line?
answer
1.544 Mbps
question
Which protocol can provide VoIP services over a Metro Ethernet connection?
answer
SIP (Session Initiation Protocol)
question
How large is an ATM cell?
answer
53 bytes