Cisco CCIE Service Provider DSL Set 4

Question - 15 Maximum mark : - 29

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Cisco CCIE Service Provider DSL Set 4

A DSL customer has subscribed to a service that provides 2 mbps downstream and 256 kbps upstream. The cable length is 10 kft (3 km). The customer reports that file transfers on the DSL line seem slower than normal
in recent days. After reviewing the DSL profile parameters for the DSL port, and the actual status of the line, what is the possible reason why the subscriber's data rates are slower than usual?DSLAM#show dsl int atm
1/1DMT profile parametersMaximum Bitrates:Interleave Path: downstream: 2048 kb/s, upstream: 256 kb/sFast
Path:
downstream: 0 kb/s, upstream: 0 kb/sMinimum Bitrates:Interleave Path: downstream: 0 kb/s, upstream:
0 kb/sFast Path: downstream: 0 kb/s, upstream: 0 kb/sMargin: downstream: 6 dB, upstream: 6 dBInterleaving
Delay: downstream: 16000 usecs, upstream: 16000 usecsCheck Bytes (FEC):Interleave Path: downstream: 16,
upstream: 16Fast Path: downstream: 0, upstream: 0R-S Codeword Size:
downstream: auto, upstream: autoTrellis Coding: DisabledOverhead Framing: Mode 3Operating Mode:
AutomaticTraining Mode: QuickMinrate blocking: DisabledSNR Monitoring:
DisabledStatus:Bitrates:Interleave Path: downstream: 640 kb/s, upstream: 256 kb/sFast Path:
downstream: 0 kb/s, upstream: 0 kb/sMargin: downstream: 6 dB, upstream: 9 dBAttenuation:
downstream: 45 dB, upstream: 31 dBInterleave Delay: downstream: 16000 usecs, upstream: 16000
usecTransmit Power: downstream: 19.4 dB, upstream: 12.0 dBCheck Bytes (FEC):Interleave Path:
downstream: 16, upstream: 16Fast Path: downstream: 0, upstream: 0R-S Codeword Size: downstream:
1, upstream: 8Trellis Coding: Not In UseOverhead Framing: Mode 3Line Fault: NONEOperating Mode:
ITU G dmt Issue 1Line Type: Interleaved Only

The signal-to-noise margin on the line will not allow downstream DSL rates faster than 640 kbps. If the
subscriber's service was in fact faster at some time, then something has changed in the line characteristics
or noise spectrum. ✘ The subscriber is provisioned for 640 kbps downstream, and the service appears to be working normally.The problem is apparently not related to the DSL (physical layer) part of the service. ✘ The service is running in G.DMT, and 640 kbps is normal for the subscriber's cable length. Change themode to ANSI T1.413 for faster rates. ✘ The DSL profile is set for 16 milliseconds interleave delay. Change the interleave delay to 0, or change theprofile to fastpath for faster line rates. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

A DSL line status report shows a high number of corrected and uncorrected errors. The line is configured at 4 milliseconds interleave delay and 4 FEC check-bytes. To reduce the number of uncorrected errors without a
detailed analysis of whether the errors are continuous or "bursty", which of the following should provide improved error correction?

Change the interleave delay to 2 milliseconds to reduce latency and change the number of FEC check-
bytes to 2 for reduced overhead ✘ Leave the interleave delay at 4 milliseconds and change the FEC check-bytes to 2 ✘ Leave the FEC check-bytes at 4 and change the interleave delay to 2 milliseconds ✘ Change the interleave delay to 16 milliseconds and the FEC check-bytes to 16 ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What statement is correct?

An IP header is always smaller than 20 bytes. ✘ An IP header is always 20 bytes. ✘ An IP header is never bigger than 20 bytes. ✘ An IP header is 20 bytes long, or larger if options are used. ✔ None of the above ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which are the correct ways to release IBGP from the condition that all IBGP neighbors need to be fully meshed? (multiple answer)

Configure local preference Configure route reflectors Configure IBGP neighbors several hops away Configure confederations

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

In BGP, why should a Route Reflector be used?

To overcome issues of split-horizon within BGP ✘ To reduce the number of External BGP peers by allowing updates to reflect without the need to be fullymeshed ✘ To allow the router to reflect updates from one Internal BGP speaker to another without the need to be fullymeshed ✘ To divide Autonomous Systems into mini-Autonomous Systems, allowing the reduction in the number ofpeers ✔ None of the above ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

BGP can implement a policy of 'Route Dampening' to control route instability. What statement about route dampening is NOT correct?

A numeric penalty is applied to a route each time it flaps. ✘ The penalty is exponentially decayed according to parameters, such as half-life-time. ✘ The history of unstable routes is forwarded back to the sender to control future updates. ✘ The route is eventually suppressed based on a configurable 'suppress limit'. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Using the above diagram, which are valid BGP AS_Path Attributes received at Net1 for a route originating from AS65100? (multiple answer)

200 57000 100 65100 200 57000 100 100 100 57000 200 200 57000 100 65100 100 57000 200

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

The TCP PUSH flag indicates:

The data in the TCP receive buffer should be sent to the application listening to this TCP connection without
waiting for further data. ✘ Any data being buffered by routers between the source and destination for this connection should be sentimmediately. ✘ The sender should make certain its send buffer is pushed onto the wire. ✘ This session is about to end. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Host 1 and Host 2 are on Ethernet LANs in different buildings. A serial line is installed between two Cisco routers using Cisco HDLC serial line encapsulation. Routers A and B are configured to route IP traffic. Host 1 sends a packet to Host 2. What is the destination MAC address of the packet on Host's 1 Ethernet?

Host 1 ✘ Host 2 ✘ Router A ✘ Router B ✔ The broadcast address ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

For communications systems what describes the over-all health of the system?

Bit-Error-Rate (BER) ✘ Synchronous Optical NETwork (SONET) ✘ Optical Signal to Noise Ratio (OSNR) ✘ None of the above ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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Cisco CCIE Service Provider DSL Set 4

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