Unit 12 Quiz & Think Critically

What is the maximum capacity of a T1 line?

1.544 Mbps

What two types of modulation does DSL use to carry data?

Amplitude & phase modulation

What are three examples of Layer 2 LAN or PAN standards that also function at Layer 1?

Answers may vary. Examples might include Ethernet, USB, Wi-Fi, and Bluetooth.

Where does an MPLS label go in a PDU?

Between Layers 2 and 3

What kind of network is the PSTN?

Circuit-switched

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.

dedicated line, virtual circuit

How many channels are in an ISDN PRI connection?

23B+D

How large is an ATM cell?

53 bytes

What device must be installed on a DSL network to protect the sound quality of phone calls?

A splitter

What information is typically included in a Layer 1 frame?

A start symbol or short preamble, a length field, the Layer 2 payload, and possibly a marker to end the frame

What specifications define the standards for cable broadband?

DOCSIS

What type of network combines fiber with coax?

HFC (hybrid fiber coaxial)

What is the lowest layer of the OSI model at which LANs and WANs support the same protocols?

Layer 3

______________ in SONET are analogous to the ________________ of T-carriers.

OC levels, digital signal levels

What are two types of virtual circuits?

PVC (permanent virtual circuit) and SVC (switched virtual circuit)

Which protocol can provide VoIP services over a Metro Ethernet connection?

SIP (Session Initiation Protocol)

What kind of device can monitor a connection at the demarc but cannot interpret data?

Smart jack

What method does a GSM network use to separate data on a channel?

TDMA (Time-division multiple access)

Which ISDN channel carries signaling information?

The Bearer channel (or B channel)

Which DSL standard has the fastest speeds immediately outside the CO?

VDSL