Ensurepass

QUESTION 151

Which four of these statements are restrictions for Frame Relay PVC bundles with QoS support for IP and MPLS? (Choose four)

 

A.

A PVC bundle will not come up unless all the precedence, DSCP, and EXP levels are configured in the bundle.

B.

A PVC bundle can perform precedence and DSCP matching at the same time

C.

A PVC bundle may contain no more than sixteen PVCs

D.

A PVC can be in only one PVC bundle

E.

A PVC bundle cannot perform precedence and DSCP matching at the same time.

F.

A PVC bundle may contain no more than eight PVCs.

 

Correct Answer: ADEF

Explanation:

Reference:

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ft_frbnd.html#wp1027175

 

Restrictions for Frame Relay PVC Bundles with QoS Support for IP and MPLS

 

A PVC can be a part of one and only one PVC bundle.

A PVC bundle may contain no more than eight PVCs.

A PVC that is a bundle member cannot be used in any other capacity, For example a PVC bundle member cannot be configured in a map statement.

A PVC bundle cannot perform precedence and DSCP matching at the same time. If the wrong matching scheme is configured, unpredictable behavior will result.

A PVC bundle will not come up unless all the precedence, DSCP, or EXP levels are configured in the bundle.

Voice over Frame Relay (VoFR) is not supported on PVC-bundle members.

Fast switching over Frame Relay PVC bundles is not supported.

 

 

QUESTION 152

In which of the following lists of APS Action 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, Manual Switch, 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 153

What are three common reasons for ATM CRC errors? (Choose three.)

 

A.

Incorrect VPI and VCI configuration

B.

Noise, gain hits, or other transmission problems on the data link equipment

C.

ATM cells are dropped due to incorrect ATM routing in the service provider.

D.

A faulty or failing ATM interface.

E.

Cells are dropped due to traffic policing in the ATM cloud on one or more virtual circuits attached to the ATM interface.

 

Correct Answer: BDE

Explanation:

Reasons for ATM CRC Errors

The following are some potential reasons for ATM CRC errors:

Dropped cells due to traffic policing in the ATM cloud on one or more VCs attached to the ATM interface.

Noise, gain hits, or other transmission problems on the data-link equipment.

A faulty or failing ATM interface.

The show interfaces command output displays the CRC error count. These errors suggest that when the SAR reassembles the packet and checks the CRC, the calculated CRC value does not match the value in the assembled packet’s CRC field.

 

 

QUESTION 154

In the context of GMPLS, LMP stands for:

 

A.

Load Management Protocol

B.

Label Management Protocol

C.

Loop Management Protocol

D.

Link Management Protocol

 

Correct Answer: D

Explanation:

The Generalized Multi-Protocol Label Switching (GMPLS)[1] is a protocol suite extending MPLS to manage further classes of interfaces and switching technologies other than packet interfaces and switching, such as time division multiplex, layer-2 switch, wavelength switch and fiber-switch.

GMPLS is composed of three main protocols:

Resource Reservation Protocol with Traffic Engineering extensions (RSVP-TE) signaling protocol.[5][6]Open Shortest Path First with Traffic Engineering extensions (OSPF-TE) routing protocol.[7][8] Link Management Protocol (LMP).[9]

 

QUESTION 155

In the Cisco Resilient Ethernet Protocol (REP), how many ports are always blocking?

 

A.

zero

B.

at least one

C.

at least two

D.

at least four

E.

at least three

 

Correct Answer: B

Explanation:

http://www.cisco.com/en/US/prod/collateral/switches/ps6568/ps6580/prod_white_paper090 0aecd8 06ec6fa.pdf

Cisco REP Operation

With REP at least one port is always blocked in any given segment, that is, the alternate port.

 

 

QUESTION 156

Which three are optional extensions of the Frame Relay Local Management Interface specification? (Choose three)

 

A.

Switched virtual circuit

B.

Virtual circuit status

C.

Simple flow control

D.

Multicasting

E.

Permanent virtual circuit

 

Correct Answer: BCD

Explanation:

Optional LMI Extensions:

The LMI specification also defines several optional extensions:

* Global addressing convention

* Multicast capability

* A simple flow control mechanism

* Ability for the network to communicate a PVC’s CIR to the subscriber in a Status message

* A new message type that allows the network to announce PVC status changes without prompting from the subscriber Implementors may build any, all, or none of these features into their networks.

 

 

QUESTION 157

What is the label for MPLS over ATM?

 

A.

VPI 16

B.

DLCI

C.

VPI and VCI

D.

circuit number

E.

PVC and SVC

 

Correct Answer: C

 

 

 

 

QUESTION 158

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 rows by 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 159

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

 

A.

Lookout of Protection, Forced Switch, 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, Forced Switch, 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 160

Which statement is FALSE concerning Concatenation?

 

A.

It allows ITCM to send multiple upstream packets in one single large burst.

B.

It reduces upstream data throughput.

C.

It can be enabled/disabled from CMTS on per upstream port basis if desired

D.

Concatenation activity on an interface can be checked by the show controller counters command

Correct Answer: B

 

Free VCE & PDF File for Cisco 400-201 Real Exam

Instant Access to Free VCE Files: CCNA | CCNP | CCIE …
Instant Access to Free PDF Files: CCNA | CCNP | CCIE …

Comments are closed.