ISCW – Implementing Secure Converged Wide Area Networks : 642-825 Exam
642-825 ISCW
Implementing Secure Converged Wide Area Networks

Exam Number: 642-825
Associated Certifications: CCNP
Duration: 90 minutes
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The Implementing Secure Converged Wide Area Networks (ISCW 642-825) is a qualifying exam for the Cisco Certified Network Professional CCNP?. The ISCW 642-825 exam will certify that the successful candidate has important knowledge and skills necessary to secure and expand the reach of an enterprise network to teleworkers and remote sites with focus on securing remote access and VPN client configuration. The exam covers topics on Cisco hierarchical network model as it pertains to the WAN, teleworker configuration and access, frame mode MPLS, site-to-site IPSEC VPN, Cisco EZVPN, strategies used to mitigate network attacks, Cisco device hardening and IOS firewall features.

Exam Topics
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposes the guidelines below may change at any time without notice.

Implement basic teleworker services.
Describe Cable (HFC) technologies.
Describe xDSL technologies.
Configure ADSL (i.e., PPPoE or PPPoA).
Verify basic teleworker configurations.

Implement Frame-Mode MPLS.
Describe the components and operation of Frame-Mode MPLS (e.g., packet-based MPLS VPNs).
Configure and verify Frame-Mode MPLS.

Implement a site-to-site IPSec VPN
Describe the components and operations of IPSec VPNs and GRE Tunnels.
Configure a site-to-site IPSec VPN/GRE Tunnel with SDM (i.e., preshared key).
Verify IPSec/GRE Tunnel configurations (i.e., IOS CLI configurations).
Describe, configure, and verify VPN backup interfaces.
Describe and configure Cisco Easy VPN solutions using SDM.

Describe network security strategies.
Describe and mitigate common network attacks (i.e., Reconnaissance, Access, and Denial of Service).
Describe and mitigate Worm, Virus, and Trojan Horse attacks.
Describe and mitigate application-layer attacks (e.g., management protocols).

Implement Cisco Device Hardening
Describe, Configure, and verify AutoSecure/One-Step Lockdown implementations (i.e., CLI and SDM).
Describe, configure, and verify AAA for Cisco Routers.
Describe and configure threat and attack mitigation using ACLs.
Describe and configure IOS secure management features (e.g., SSH, SNMP, SYSLOG, NTP, Role-Based CLI, etc.)

Implement Cisco IOS firewall.
Describe the functions and operations of Cisco IOS Firewall (e.g., Stateful Firewall, CBAC, etc.).
Configure Cisco IOS Firewall with SDM.
Verify Cisco IOS Firewall configurations (i.e., IOS CLI configurations, SDM Monitor).

Describe and configure Cisco IOS IPS.
Describe the functions and operations of IDS and IPS systems (e.g., IDS/IPS signatures, IPS Alarms, etc.)
Configure Cisco IOS IPS using SDM.

Exam Number/Code: 642-825
Exam Name:ISCW – Implementing Secure Converged Wide Area Networks

“ISCW – Implementing Secure Converged Wide Area Networks”, also known as 642-825 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 310 Q&As to your 642-825 Exam preparation. In the 642-825 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
Free Demo Download Actualtests offers free demo for 642-825 exam (ISCW – Implementing Secure Converged Wide Area Networks). You can check out the interface, question quality and usability of our practice exams before you decide to buy it.

Exam DetailsThe Implementing Secure Converged Wide Area Networks (ISCW 642-825) is a qualifying exam for the Cisco Certified Network Professional CCNP?. The ISCW 642-825 exam will certify that the successful candidate has important knowledge and skills necessary to secure and expand the reach of an enterprise network to teleworkers and remote sites with focus on securing remote access and VPN client configuration. The exam covers topics on Cisco hierarchical network model as it pertains to the WAN, teleworker configuration and access, frame mode MPLS, site-to-site IPSEC VPN, Cisco EZVPN, strategies used to mitigate network attacks, Cisco device hardening and IOS firewall features.

QUESTION 11:
Which proprietary DSL encapsulation type has the potential of dividing telephone
lines into three widely separated, distinct channels for the sake of minimizing
interference between voice, upstream and downstream data flows?
A. G.Lite
B. CAP
C. DMT
D. Half-rate DMT
Answer: B
Explanation:
CAP operates by dividing the signals on the telephone line into three distinct bands:
Voice conversations are carried in the 0 to 4 KHz (kilohertz) band, as they are in all
POTS circuits. The upstream channel (from the user back to the server) is carried in a
band between 25 and 160 KHz. The downstream channel (from the server to the user)
begins at 240 KHz and goes up to a point that varies depending on a number of
conditions (line length, line noise, number of users in a particular telephone company
switch) but has a maximum of about 1.5 MHz (megahertz). This system, with the three
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channels widely separated, minimizes the possibility of interference between the
channels on one line, or between the signals on different lines.
References:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 248 & 249

http://www.esi-websolutions.com/technology_ADSL.htm

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QUESTION 12:
Over which of the following DSL services is the foundation that
Cisco’s Long Reach Ethernet (LRE) is based on?
A. ADSL
B. HDSL
C. IDSL
D. VDSL
E. E. None of the above
Answer: D
Explanation:
Cisco Long Range Ethernet (LRE) solution leverages Very High Data Rate Digital
Subscriber Line (VDSL) technology to dramatically extend Ethernet services over
existing Category 1/2/3 twisted pair wiring at speeds from 5 to 15 Mbps (full duplex) and
distances up to 5,000 feet. The Cisco LRE technology delivers broadband service on the
same lines as Plain Old Telephone Service (POTS), digital telephone, and ISDN traffic.
In addition, Cisco LRE supports modes compatible with Asymmetric Digital Subscriber
Line (ADSL) technologies, allowing service providers to provision LRE to buildings
where broadband services already exist
Reference:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 251
QUESTION 13:
Which ADSL modulation type:
1. is prominent in residential applications
2. has 120 subchannels
3. doesn’t need a splitter
4. has a 1.5 Mbps maximum downstream speed?
A. CAP
B. DMT
C. G.Lite
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D. PPPoA
E. PPPoE
Answer: C
Explanation:
ITU GLITE (ITU G.992.2) describes splitterless Asymmetric Digital Subscriber Line
(ADSL) Transceivers on a metallic twisted pair that allows high-speed data transmission
between the Central Office (ATU-C) and the customer end remote terminal (ATU-R).
G.LITE can provide ADSL transmission simultaneously on the same pair with voice
(band) service, ADSL transmission simultaneously on the same pair with ISDN services
(G.961 Appendix I or II); or ADSL transmission on the same pair with voice band
transmission and with TCM-ISDN (G.961 Appendix III) in an adjacent pair.G.992.2
supports a maximum 1.536 Mbps downstream and 512 kbps upstream net data rate.
G.LITE uses discrete Multitone (DMT) line code. DMT is based in the use of the IFFT to
generate a set of sub-channels, and transmit information in each sub-channel
independently. Figure 1 shows the G.LITE spectrum with indication of the POTS,
upstream pilot tone, downstream pilot tone, subcarrier spacing, and number of subcarriers
for the upstream and downstream direction. Dividing the available bandwidth into a set
of independent, orthogonal subchannels are the key to DMT performance. By measuring
the SNR of each subchannel and then assigning a number of bits based on its quality,
DMT transmits data on subcarriers with good SNRs and avoids regions of the frequency
spectrum that are too noisy or severely attenuated. The underlying modulation technique
is based on quadrature amplitude modulation (QAM). Each subchannel is 4.3125 kHz
wide and is capable of carrying up to 15 bits. The downstream is up to 552 kHz, offering
122 subchannels, and the upstream from 26 to 138 kHz, offering 25 upstream
subchannels.
Reference: http://www.vocal.com/data_sheets/full/glite.pdf
QUESTION 14:
Certain physical factors are capable of severely limiting the maximum speed
available on a DSL connection. Which of the following describe the factors that are
capable of it? (Choose all that apply)
A. Number of telephones attached to the local loop.
B. Gauge of wire used on the local loop.
C. Distance between the CPE and the DSLAM.
D. Bridge taps in the local loop.
E. Loading coils in the subscriber’s line.
Answer: C, E
Explanation:
DSL is a highly distance-sensitive technology. As the distance from the CO increases, the
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signal quality and connection speeds decrease. ADSL service is limited to a maximum
distance of 18,000 feet (5460 m) between the DSL CPE and the DSLAM, although many
ADSL providers place an even lower limit on the distance to ensure quality. The
18,000-foot distance limitation for DSL is not a limitation for voice telephone calls, but
for data transmission. The telco uses small amplifiers, called loading coils, to boost voice
signals. Loading coils have a nasty tendency to disrupt DSL data signals. This means that
if there are loading coils in the loop between the CPE and CO, you probably are not
within an area that can receive DSL service.
Reference:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 247
QUESTION 15:
A local Internet Service Provider is going to start offering ADSL with 640 kbps
upload speed and 4Mbps download speeds. They have retained you to help in their
advertisement campaign to help them find their target market. What groups of
users should you target your marketing efforts to? (Choose two)
A. Central data processing facilities receiving simultaneous uploads of data from remote
offices.
B. Support organizations providing ftp services for software distribution and
documentation.
C. Small home offices requiring 24 hour connection to the Internet for email and web
communication.
D. Web services companies providing dynamic web content serving, including
video-on-demand.
Answer: A, C
Explanation:
Based on the expanding number of options currently and coming soon for the broadband
market, competition for home and remote user dollars has reached a frenzied state. The
deployment of broadband and similar technologies has involved quite a large amount of
trial and error. The competition has seen the emergence of two primary services for
widespread deployment. These are Cable and DSL.
Loosely defined, DSL is a technology that exploits unused frequencies on copper
telephone lines to transmit traffic, typically at multimegabit speeds. DSL uses existing
telephone wiring, without requiring any additional cabling resources. It has the capability
to allow voice and high-speed data to be sent simultaneously over the same copper pair.
The service is always available, so the user does not have to dial in or wait for call setup.
DSL technologies can be broken down into two fundamental classifications: asymmetric
(ADSL) and symmetric (SDSL). As the name implies, ADSL uses higher downstream
rates and lower upstream rates. In contrast, SDSL uses the same downstream and
upstream rates. ADSL is the most commonly deployed DSL technology, and is the
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primary focus of the DSL portion of the CCNP Remote Access Exam.
Incorrect Answers:
B: In order to maximize the use of an FTP server, you would want a greater upload
speed, since the majority of users will be downloading files from the FTP server.
D: Again, we would want to ensure that the upload speed was as large as possible, due to
the fact that the majority of the bandwidth will be consumed as uploads to the end users.
Reference:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 245 to 247
QUESTION 16:
What’s true about the G.Lite (G.922) ADSL ITU standard?
A. It offers equal bandwidth for upstream and downstream data traffic.
B. It has limited operating range of less than 4,500 feet.
C. It was developed specifically for the consumer market segment requiring higher
download speeds.
D. Signals cannot be carried on the same wire as POTS signals.
E. All of the above
Answer: C
Explanation:
G.Lite is the informal name for what is now a standard way to install Asymmetric Digital
Subscriber Line (ADSL) service. Also known as Universal ADSL, G.Lite makes it
possible to have Internet connections to home and business computers at up to 1.5 Mbps
(millions of bits per second) over regular phone lines. Even at the lowest downstream
rate generally offered of 384 Kbps (thousands of bits per second), G.Lite is about seven
times faster than regular phone service with a V.90 modem and three times faster than an
Integrated Services Digital Network (ISDN) connection. Upstream speeds from the
computer are at up to 128 Kbps. (Theoretical speeds for ADSL are much higher, but the
data rates given here are what is realistically expected.)
With G.Lite, your computer’s analog-to-digital modem is replaced with an “ADSL
modem.” and the transmission from the phone company is digital rather than the analog
tranmission of “plain old telephone service.” G.Lite is also known as “splitterless DSL”
because, unlike other DSL technologies, it does not require that a technician come to
install a splitter, a device that separates voice from data signals, at the home or business
(sometimes referred to as “the truck roll”).
The G.Lite standard is officially known as G.992.2.
DSL technologies can be broken down into two fundamental classifications: asymmetric
(ADSL) and symmetric (SDSL). As the name implies, ADSL uses higher downstream
rates and lower upstream rates. In contrast, SDSL uses the same downstream and
upstream rates. ADSL is the most commonly deployed DSL technology, and is the
primary focus of the DSL portion of the CCNP Remote Access Exam.
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DSL is a highly distance-sensitive technology. As the distance from the CO increases, the
signal quality and connection speeds decrease. ADSL service is limited to a maximum
distance of 18,000 feet (5460 m) between the DSL CPE and the DSLAM, although many
ADSL providers place an even lower limit on the distance to ensure quality.
References:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 245 to 247

http://whatis.techtarget.com/definition/0,,sid9_gci212198,00.html

QUESTION 17:
When designing an ADSL network; if you want minimal local loop impairments,
what should be the maximum distance of your lines?
A. 1000 feet (0.3 km)
B. 4000 feet (1,5 km)
C. 12,000 feet (3.65 km)
D. 18,000 feet (5,5 km)
E. 28,000 feet (8.52 km)
Answer: D
Explanation:
DSL is a highly distance-sensitive technology. As the distance from the CO increases, the
signal quality and connection speeds decrease. ADSL service is limited to a maximum
distance of 18,000 feet (5460 m) between the DSL CPE and the DSLAM, although many
ADSL providers place an even lower limit on the distance to ensure quality. The
18,000-foot distance limitation for DSL is not a limitation for voice telephone calls, but
for data transmission. The telco uses small amplifiers, called loading coils, to boost voice
signals. Loading coils have a nasty tendency to disrupt DSL data signals. This means that
if there are loading coils in the loop between the CPE and CO, you probably are not
within an area that can receive DSL service.
Reference:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 247
QUESTION 18:
A new ADSL line is being installed in the home office of the Certkiller administrator.
What best describes ADSL?
A. Equal upload and downloads speeds.
B. Slow upload, fast download speeds.
C. An ISDN line with no D channel.
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D. Used as a T-1 replacement.
Answer: B
Explanation:
The variation called ADSL (Asymmetric Digital Subscriber Line) is the form of DSL that
will become most familiar to home and small business users. ADSL is called
“asymmetric” because most of its two-way or duplex bandwidth is devoted to the
downstream direction, sending data to the user. Only a small portion of bandwidth is
available for upstream or user-interaction messages. However, most Internet and
especially graphics- or multi-media intensive Web data need lots of downstream
bandwidth, but user requests and responses are small and require little upstream
bandwidth. Using ADSL, up to 6.1 megabits per second of data can be sent downstream
and up to 640 Kbps upstream. The high downstream bandwidth means that your
telephone line will be able to bring motion video, audio, and 3-D images to your
computer or hooked-in TV set. In addition, a small portion of the downstream bandwidth
can be devoted to voice rather data, and you can hold phone conversations without
requiring a separate line.
Reference:

http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213915,00.html

QUESTION 19:
Which two statements are true about DSL? (Choose two)
A. SDSL and POTS can work together.
B. It uses the unused bandwidth of your existing phone line.
C. Bandwidth is shared among users in the same geographical area.
D. ADSL has a maximum distance limitation of 18,000 feet from the CO.
E. None of the above
Answer: B, D
Explanation:
DSL is a very high-speed connection that uses the same wires as a regular telephone line.
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Precisely how much benefit you see will greatly depend on how far you are from the
central office of the company providing the ADSL service. ADSL is a distance-sensitive
technology: As the connection’s length increases, the signal quality decreases and the
connection speed goes down. The limit for ADSL service is 18,000 feet (5,460 meters)
from the central office, though for speed and quality of service reasons many ADSL
providers place a lower limit on the distances for the service. At the extremes of the
distance limits, ADSL customers may see speeds far below the promised maximums,
while customers nearer the central office have faster connections and may see extremely
high speeds in the future. ADSL technology can provide maximum downstream (Internet
to customer) speeds of up to 8 megabits per second (Mbps) at a distance of about 6,000
feet (1,820 meters), and upstream speeds of up to 640 kilobits per second (Kbps). In
practice, the best speeds widely offered today are 1.5 Mbps downstream, with upstream
speeds varying between 64 and 640 Kbps.
QUESTION 20:
Two Certkiller routers are connected as shown below:
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Certkiller 1 is configured as shown below:
Refer to the exhibit and the partial configuration on the Certkiller router.
The Certkiller DSL Router is connected to a service provider using a PPPoE session
over a DSL line. The FTP traffic, generated from inside the network 10.92.1.0/24,
fails to reach the PPPoE Server. What should be configured on the DSL Router to
fix the problem?
A. The ip mtu command with a bytes argument set greater than 1500 needs to be
configured for the Dialer1 interface.
B. The ip mtu command with a bytes argument set lower than 1500 needs to be
configured for the ATM0 interface.
C. The ip mtu command with a bytes argument set greater than 1500 needs to be
configured for the ATM0 interface.
D. The ip mtu command with a bytes argument set lower than 1500 needs to be
configured for the Dialer1 interface.
E. None of the above
Answer: D

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