Pass4sure P4s Cisco CCNP ISCW Exam 642-825 V3.10

Posted by certificate - Inside Pass4sure - Tags: ccnp, Pass4sure Testking.com Help you pass any exams

04 Sep.

CCNP 642-825 Simulation
Pass4sure 642-825 Exam will provide you with exam simulation questions and actual answers that reflect the actual exam. These Pass4sure 642-825 simulation questions and answers provide you with the experience of taking the actual test. Pass4sure 642-825 Exam is not just simulation questions and answers. They are your access to high technical expertise and accelerated learning capacity. Pass4sure 642-825 questions have detailed explanations for every answer and thus ensures that you fully understand the questions and the concept behind the questions.

Product 642-825 Description

Exam Number:642-825
Exam Name:Cisco Certification - ISCW - Implementing Secure Converged Wide Area Networks
Market Price:$129.99
Member Price:$89.99
Where can you buy the 642-825 exam online?
We recommend Pass4sure 642-825 Pass4sure Engine which will help you pass the 642-825 exam.

Pass4sureDemo 642-825 Exam Details
Comprehensive questions with complete details about Pass4sure 642-825 exam
Tested by many real exams before publishing
Verified Pass4sure 642-825 Answers Researched by Industry Experts
Pass4sure 642-825 exam questions accompanied by exhibits
Drag and Drop questions as experienced in the Real Pass4sure 642-825 Exams

ISCW - Implementing Secure Converged Wide Area Networks : 642-825 ExamQUESTION NO: 1
A few small certifyme.com locations use HFC cable to connect to the certifyme.com 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 NO: 2
Many small certifyme.combranch offices use broadband cable for data connection
access. Which three modulation signaling standards are used in broadband cable
technology? (Select three)
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 NO: 3
Some of the smaller certifyme.comlocations use HFC cable to connect to the certifyme.com
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
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.
QUESTION NO: 4
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
P4s Cisco CCNP ISCW Exam 642-825
p4s ccnp iscw 642-825 Questions and Answers : 310 Q&As
Updated: 2008-09-02
Market Price: $129.99
Member Price: $89.99