Cisco 642-825 Free Demo – 2
Posted on | January 26, 2010 | No Comments
Section 2: Describe xDSL Technologies (11 Questions)
Q9
Exambible operates 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.
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E. None of the above
Answer: A
Q10
Exambible is a DSL service provider using providing xDSL to its customers.
Which statement about xDSL implementations is true?
A. All xDSL standards operate in lower frequencies than the POTS system and
can therefore coexist on the same media.
B. Other than providing higher data rates, HDSL is identical to ADSL.
C. The ADSL standard operates in higher frequencies than the POTS system and
can therefore coexist on the same media.
D. The HDSL standard operates in higher frequencies than the POTS system and
can therefore coexist on the same media.
E. All xDSL standards operate in higher frequencies than the POTS system and
therefore can coexist on the same media.
F. None of the above.
Answer: C
Q11
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:
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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 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 821 – Exam Certification Guide 2004 (ISBN 1-587208) Page
248 & 249 http://www.esi-websolutions.com/technology_ADSL.htm
Q12
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:
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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 821 – Exam Certification Guide 2004 (ISBN 1-587208) Page
251
Refecener: Exambible 642-825
Relate Link: 642-901
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