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642-825 Exam: Implementing Secure Converged Wide Area Networks (ISCW)642-825 Exam: Implementing Secure Converged Wide Area Networks (ISCW)
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QUESTION 1:
A few small Certkiller locations use HFC cable to connect to the Certkiller WAN.
Which HFC cable network statement is true about the downstream data channel to
the customer and the upstream data channel to the service provider?
A. The upstream data path is assigned a channel in a higher frequency range than the
downstream path has.
B. The downstream data path is assigned a 30 MHz channel and the upstream data path is
assigned a 1 MHz channel.
C. The downstream data path is assigned a fixed bandwidth channel and the upstream
data path uses a variable bandwidth channel.
D. Both upstream and downstream data paths are assigned in 6 MHz channels.
E. None of the above.
Answer: D
Explanation:
Hybrid fiber-coaxial (HFC): A mixed optical-coaxial network in which optical fiber
replaces some or all of the traditional trunk portion of the cable network.
The HFC architecture is the evolution of an initial cable system and signifies a network
that incorporates both optical fiber along with coaxial cable to create a broadband
network. By upgrading a cable plant to an HFC architecture, you can deploy a data
network over an HFC system to offer high-speed Internet services and you can serve
more subscribers. The cable network is segmented into smaller service areas in which
fewer amplifiers are cascaded after each optical node-typically five or fewer. The
tree-and-branch network architecture for HFC can be a fiber backbone, cable area
network, superdistribution, fiber to the feeder, or a ring.
Downstream: An RF signal transmission (TV channels, data) from source (headend) to
the destination (subscribers). Downstream is also called a forward path.
Upstream: An RF signal transmission opposite to downstream-from subscribers to the
headend. Upstream is also called a return or reverse path.
Delivering services over a cable network requires different RF frequencies-the outgoing
frequencies are in the 50-to-860 MHz range, the incoming are in the 5-to-42 MHz range.
To deliver data services over a cable network TV channels which usually operate at 6
MHz range for the downstream, and 6 MHz or less (for asymmetric cable connections)
for upstream traffic from the corresponding frequency range are usually used.
QUESTION 2:
Many small Certkiller branch offices use broadband cable for data connection
access. Which three modulation signaling standards are used in broadband cable
technology? (Select three)
642-825
Actualtests.com – The Power of Knowing
A. S-Video
B. NTSC
C. SECAM
D. PAL
E. FEC
F. FDM
G. MLP
Answer: B, C, D
Explanation:
Broadband: Data transmission where multiple pieces of data are sent simultaneously to
increase the effective rate of transmission. In cable systems, the term broadband refers to
the frequency-division multiplexing (FDM) of many signals in a wide radio frequency
(RF) bandwidth over an HFC network, and the capability to handle vast amounts of
information.
NTSC is a North American TV technical standard for analog TV systems. The standard
was created in 1941 and is named after the National Television System Committee
formed in 1940. The standard uses a 6-MHz modulated signal. PAL is a color encoding
system used in broadcast television systems in most of Europe, Asia, Africa, Australia,
Brazil, and Argentina, and uses a 6-MHz, 7-MHz, or 8-MHz modulated signal. The color
difference signals an alternate phase at the horizontal line rate. SECAM is an analog
color TV system used in France and certain Eastern European countries that uses an
8-MHz modulated signal.
QUESTION 3:
Some of the smaller Certkiller locations use HFC cable to connect to the Certkiller
WAN. Which two statements are true about broadband cable (HFC) systems?
(Select two)
A. Cable modems operate at Layers 1, 2, and 3 of the OSI model.
B. Cable modems operate at Layers 1 and 2 of the OSI model.
C. A function of the cable modem termination system is to convert the digital data stream
from the end user host into a modulated RF signal for transmission onto the cable system.
D. Cable modems only operate at Layer 1 of the OSI model.
E. A function of the cable modem termination system (CMTS) is to convert the
modulated signal from the cable modem into a digital signal.
Answer: B, E

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