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ISCW – Implementing Secure Converged Wide Area Networks : 642-825 Exam
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Exam Number:642-825
Exam Name:Cisco Certification – ISCW – Implementing Secure Converged Wide Area Networks
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A certifyme.comremote user is getting Internet access from the local cable provider.
When an individual is connected to the Internet by way of a CATV cable service,
what kind of traffic is considered upstream traffic?

A. Traffic going from the user’s home traveling to the headend.
B. Broadcast traffic, including the cable TV signals.
C. Traffic between the headend and the TV signal.
D. Traffic between the headend and the supplier antenna.
E. Traffic from outside the local cable segment serving the user’s home.
F. All of the above can be considered upstream
Answer: A
Explanation:
In the CATV space, the downstream channels in a cable plant (cable head-end to
subscribers) is a point-to-multipoint channel. This does have very similar characteristics
to transmitting over an Ethernet segment where one transmitter is being listened to by
many receivers. The major difference is that base-band modulation has been replaced by
a more densely modulated RF carrier with very sophisticated adaptive signal processing
and forward error correction (FEC).
In the upstream direction (subscriber cable modems transmitting towards the head-end)
the environment is many transmitters and one receiver. This introduces the need for
precise scheduling of packet transmissions to achieve high utilization and precise power
control so as to not overdrive the receiver or other amplifier electronics in the cable
system. Since the upstream direction is like a single receiver with many antennas, the
channels are much more susceptible to interfering noise products. In the cable industry,
we generally call this ingress noise. As ingress noise is an inherent part of CATV plants,
the observable impact is an unfortunate rise in the average noise floor in the upstream
channel. To overcome this noise jungle, upstream modulation is not as dense as in the
downstream and we have to use more effective FEC as used in the downstream.
Reference: http://www.cisco.com/warp/public/759/ipj_1-3/ipj_1-3_catv.html
QUESTION NO: 5
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?

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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.
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