Pass4sure > Cisco > CCNP > Exam 642-825
ISCW – Implementing Secure Converged Wide Area Networks : 642-825 ExamWhen a cable modem is being provisioned to operate with a host system for Internet
services, which two options must occur before Layer 1 and 2 connectivity can
occur? (Choose two)

A. The cable modem must request an IP address and core configuration information from
a Dynamic Host Configuration Protocol (DHCP) server.
B. The cable modem powering up must scan and lock on the RF data channel in the
downstream path.
C. The modem must request a DOCSIS configuration file from a TFTP server.
D. The cable modem must register with the CMTS.
E. The modem must read specific maintenance messages in the downstream path.
Answer: B, E
Explanation:
According to the DOCSIS (Data-over-Cable Service Interface Specifications) when you
first power up a cable modem it starts scanning (starting at a low frequency) for a cable
signal. When it ‘hears’ a cable modem stream it listens for a broadcast (from the service
provider) which contains information (ie. frequency) needed to talk back with the head
end. It then ‘talks back’ and if it communicates the right authentication information, it is
allowed to proceed. Once these steps are completed, layers 1 and 2 will be operational.
QUESTION NO: 8
How is cable broadband technology able to transmit downstream and upstream
data while at the same time delivering television content?

A. The cable operator uses the VHF hyperband to transmit and receive data signals.
B. The cable operator assigns any available spectrum to data, depending on how its own
television spectrum is being used.
C. The cable operator uses specific bandwidths for data signals specified by DOCSIS.
D. The cable operator places its data signals into clean areas where there is no
interference from noise or other signals.
Answer: C
QUESTION NO: 9
certifyme.comoperates a DSL network. What does the “dsl operating-mode auto”
command configure on a Cisco router?

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A. It configures a Cisco router to automatically detect the proper modulation method to
use when connecting an ATM interface.
B. It configures a Cisco router to automatically detect the proper DSL type (ADSL,
IDSL, HDSL, VDSL) to use when connecting an ATM interface.
C. It configures a Cisco router to automatically detect the proper encapsulation method to
use when connecting an ATM interface.
D. It configures a Cisco router to automatically detect the proper authentication method
to use when connecting an ATM interface.
E. None of the above
Answer: A
Explanation:
dsloperating-mode auto interface configuration command to specify that the router
automatically detect the DSL modulation that the service provider is using and set the
DSL modulation to match. An incompatible DSL modulation configuration can result in
failure to establish a DSL connection to the DSLAM of the service provider
Example:
QUESTION NO: 10
certifyme.comis a DSL service provider using providing xDSL to its customers. Which
statement about xDSL implementations is true?
A. All xDSL standards operate in lower frequencies than the POTS system and can
therefore coexist on the same media.
B. Other than providing higher data rates, HDSL is identical to ADSL.
C. The ADSL standard operates in higher frequencies than the POTS system and can
therefore coexist on the same media.
D. The HDSL standard operates in higher frequencies than the POTS system and can
therefore coexist on the same media.
E. All xDSL standards operate in higher frequencies than the POTS system and therefore
can coexist on the same media.
F. None of the above.
Answer: C
Explanation:
DSL is not a complete end-to-end solution, but rather a physical layer transmission
technology similar to dial, cable, or wireless. DSL connections are deployed in the “last
mile” of a local telephone network-the local loop. The connection is set up between a pair
of modems on either end of a copper wire extending between the customer premises
equipment (CPE) and the DSL access multiplexer (DSLAM). A DSLAM is the device
located at the central office (CO) of the provider and concentrates connections from
multiple DSL subscribers.

The term xDSL covers a number of DSL variations, such as ADSL, high-data-rate DSL
(HDSL), Rate Adaptive DSL (RADSL), symmetric DSL (SDSL), ISDN DSL (IDSL),
and very-high-data-rate DSL (VDSL). DSL types not using the voice frequencies band
allow DSL lines to carry both data and voice signals simultaneously (for example, ADSL
and VDSL), while other DSL types occupying the complete frequency range can carry
data only (for example, SDSL and IDSL). Data service provided by a DSL connection is
always-on. The data rate that DSL service can provide depends upon the distance
between the subscriber and the CO. The smaller the distance, the higher data rate can be
achieved. If close enough to a CO offering DSL service, the subscriber might be able to
receive data at rates of up to 6.1 Mbps out of a theoretical 8.448 Mbps maximum.

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Updated: 2008-09-02
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