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ISCW - Implementing Secure Converged Wide Area Networks : 642-825 Exam
A new cable modem was shipped to the home of a certifyme.comuser, where it is being
installed for the first time. When a DOCSIS 1.1 compliant cable modem first
initializes, (boots up) what does it do?
A. Establishes IP connectivity (DHCP).
B. Determines the time of day.
C. Requests a DOCSIS configuration file from a TFTP server.
D. Scan for a downstream channel and the establishment of timing synchronization with
the CMTS.
E. None of the above.
Answer: D
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.
References: Page 225 of the CCNP Self-Study BCRAN (642-821) ISBN: 1-58720-084-8
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide_chapter09186a008019b57f.htm
QUESTION NO: 6
You are building a small network at your home and you intend on connecting your
cable modem to a Cisco router. Which router interface would you connect the
modem to?
A. Synchronous serial
B. Asynchronous serial
C. Ethernet
D. auxiliary
E. BRI
Answer: C
Explanation:
In certain environments where a non Cisco Cable Modem (CM) is used, and the CM is
only capable of bridging, a Cisco router such as the Cisco 806 can be connected to the
Cable Modem via the Ethernet interface. The routing can then be performed by the Cisco
router behind the Cable Modem and the Client PC or Customer Premises Equipment
(CPE) will be connected to the Cisco router. Network Address Translation (NAT) can
then be configured on the Cisco router.
When the Cisco router is connected behind the Cable Modem the first problem that might
be encountered is not obtaining an IP address dynamically on the Cisco router’s Ethernet
interface. Most Internet Service Providers (ISPs) allow only one host or PC behind the
Cable Modem. Some ISPs assign an IP address to the PC based on the host name.
Therefore, if you have a Cisco router behind the Cable Modem, then the host name for
the router configured using the hostname command should be the same host name given
by the ISP.
QUESTION NO: 7
When 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?
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:
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