Download New Updated (Spring 2015) Cisco 350-029 Actual Tests 131-140

By | April 26, 2015

Ensurepass

 

 

QUESTION 131

Which two are characteristics of an IPv6 multicast address? (Choose two)

 

A.

Is allocated from the unicast address space

B.

Second octet contains a 4-bit multicast scope field

C.

Starts with a prefix of FE80 to FEBF in hex

D.

Last 64 bit contains the modified MAC address of the Ethernet interface

E.

First (most significant) octet is FF in hex

F.

Starts with a prefix of FECO to FEFF in hex

 

Correct Answer: BE

Explanation:

The 12000 uses virtual output queues to eliminate the Head of Line Blocking within the switch fabric.

 

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QUESTION 132

What is the importance of using VirtualOutput Queues on ingress Line Cards in a high-end router?

 

A.

Increases forwarding performance

B.

Simplifies configuration

C.

Prevents head-of-line blocking

D.

Uses less memory

 

Correct Answer: C

Explanation:

The 12000 uses virtual output queues to eliminate the Head of LineBlocking within the switch fabric.

 

 

QUESTION 133

Which of the following is a correct arrangement of APS Action Requests in order of priority, with highest priority first?

 

A.

Lookout of Protection, ForcedSwitch, SD, Manual Switch

B.

SD, Lockout of Protection, Forced Switch, Manual Switch

C.

Lockout of Protection, Manual Switch, SD, Forced Switch

D.

Manual Switch, Forced Switch, Lockout of Protection, SD

E.

Manual Switch, Lockout of Protection, ForcedSwitch, SD

 

Correct Answer: A

Explanation:

1.1. Packet over SONET

Table 1 shows the priority requests from the highest (lockout) to the lowest (manual).

Table 1 APS Priority Request

Priority Priority Request

1 Lockout of protect port

2 Forced switch

3 Signal failure – low priority

4 Signal degradation – low priority

5 Manual switch

QUESTION 134

In which of the following lists of APS Acti
on Requests is the priority correctly arranged from lowest to highest?

 

A.

Wait-to-Restore, Manual Switch, Forced Switch, Lockout of Protection

B.

Wait-to-Restore, Forced Switch, Manual Switch, Lockout of Protection.

C.

Manual Switch, Wait-to-Restore, Lockout of Protection, Forced Switch.

D.

Lockout of Protection, Forced Switch, Manual Switch, Wait-to-Restore

E.

Lockout of Protection, ManualSwitch, Forced Switch, Wait-to-Restore

F.

Wait-to-Restore, Manual Switch, Lockout of Protection, Forced Switch

 

Correct Answer: A

Explanation:

1.1. Packet over SONET

Table 1 shows the priority requests from the highest (lockout) to the lowest (manual).

Table 1 APS Priority Request

Priority Priority Request

1 Lockout of protect port

2 Forced switch

3 Signal failure – low priority

4 Signal degradation – low priority

5 Manual switch

 

 

QUESTION 135

SONET’s three layers arE. (Choose three.)

 

A.

DS1

B.

Frame

C.

Path

D.

Line

E.

Section

 

Correct Answer: CDE

Explanation:

SONET Layers

SONET divides the overhead and transport functions into three layers:

 

Section

Line

Path

 

These three layers are associated with both the physical equipment that segments the network and the bytes of information that flowsthrough the network elements.

 

 

QUESTION 136

For SONET ring switching, the 50ms switch time? (Choose two.)

 

A.

lncludes the detection time

B.

Applies to rings smaller than 1200km

C.

Applies to rings smaller than 1000km

D.

Includes up to 16 nodes

 

Correct Answer: BD

Explanation:

APS protection switching has always been known for its recovery speed. SONET defines a maximum switch time of 50 milliseconds for a BLSR ring with no extra traffic and less than 1200 km of fiber. The specifications actually state 60 milliseconds, with 10 ms for discovery of the problem and 50 ms to perform the switch, but most people refer to this as just 50 ms. The maximum number of nodes on a BLSR is 16.

 

 

QUESTION 137

Which three are advantages of SONET? (Choose three)

 

A.

Allows the transportation of all forms of traffic

B.

Multiplexing is easy

C.

Clocks do not need to be synchronized

D.

Reduces network complexity and cost

E.

Padding is not necessary and not permitted

 

Correct Answer: ABD

Explanation:

SONET Advantages

The big advantage of SONET is thatit was designed to provide the following functions needed in networking at that time:

 

Single-step multiplexing

Access to low-level signals directly

Carry existing DS1, DS3, ATM, and packet traffic

Synchronous timing to eliminate bit stuffing

Overhead roomfor acceptable network management information Allow transmission of data at higher speeds (50 Mbps+)

 

 

QUESTION 138

Which statement about standard STS-1 SONET framing is true?

 

A.

8 rows by 64 bytes

B.

6 rows by 64 bytes

C.

10 rows by 96 bytes

D.

8 rowsby 128 bytes

E.

9 rows by 90 bytes

 

Correct Answer: E

Explanation:

In the case of an STS-1, the frame is 810 octets in size, while the STM- 1/STS-3c frame is 2,430 octets in size.

For STS-1, the frame is transmitted as three octets of overhead, followed by 87 octets of payload.This is repeated nine times, until 810 octets have been transmitted, taking 125 s. In the case of an STS-3c/STM-1, which operates three times faster than an STS-1, nine octets of overhead are transmitted, followed by 261 octets of payload. This is also repeated nine times until 2,430 octets have been transmitted, also taking 125 s.

 

For both SONET and SDH, this is often represented by displaying the frame graphically: as a block of 90 columns and nine rows for STS-1, and 270 columns and nine rows for STM1/STS-3c. This representation aligns all the overhead columns, so the overhead appears as a contiguous block, as does the payload.

 

 

QUESTION 139

Which two statements are true about DPT/RPR?

 

A.

DPT/RPR uses a bi-directional ring consisting of twosymmetric counter rotating fibre rings.

B.

DPT/RPR is defined in the IEEE 802.17 standard and it uses Token Bucket system to avoid collisions on the fiber.

C.

DPT/RPR can be deployed in the Core of the SP networks where point-to-point POS links are used tomake best use of the Bandwidth.

D.

In DPT/RPR rings, data packets can be sent in one direction (downstream) and the corresponding control packets in the opposite direction (upstream), thus using both fibres concurrently to maximize bandwidth.

 

Correct Answer: AD

Explanation:

SONET/SDH is the accepted transport architecture.

The key building block is the twin optical fiber ring forming point-to-point connections that are”nailed up” between several SONET/SDH add-drop multiplexers (ADM).

The twin fiber rings in SONET/SDH ring run in parallel, one is the working ring carrying the communication traffic. The other is the protection ring acting as a backup in the event of cable failure or failure of an ADM node.

SONET/SDH provides good quality performance monitoring and failure protection information which also travel along the ring.

The exclusive use of one ring for data and the other for protection means one ring is fully utilized and the other
ring is virtually redundant, awaiting the unlikely event of a failure. This,of course, is not the most efficient use of fiber, especially given the considerable cost to lay fiber.

 

 

QUESTION 140

What does FRTP stand for?

 

A.

Frame Relay Top Pseudowire

B.

Frame Relay Traffic Pseudowire

C.

Frame Relay Traffic Protocol

D.

Frame Relay Traffic Policing

 

Correct Answer: D

Explanation:

Frame Relay Traffic Policing provides a mechanism to rate-limit packets on switched PVCs using a “leakybucket”implementation. When enabled, Traffic Policing prevents traffic congestion by discarding or setting the Discard Eligible (DE) bit on packets that exceed specified traffic parameters. Traffic Policing parameters can be specified per DCE interface, or per switched PVC, using the ‘map class’ mechanisms.

 

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