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4A0-105 Questions and Answers

Question # 6

Why should you configure send-flush-on failure on your PE routers when using active/standby pseudowires?

A.

It flushes the local FDB speeding recovery

B.

It discards all packets in the queue and sends icmp-discad messages to the sender. The packets are re-transmitted resulting in no loss of data.

C.

On failure, the PE sends an LDP flush-all-from-me message to all PE devices in the VPLS. This speeds convergence to the new topology.

D.

It is not important to use send-flush-on-failure as Active/Standby signalling automatically converges the FDB in all VPLS instances

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Question # 7

A customer has requested a VPLS service. The customer is using dot1q encapsulation and they have requested that all vlan tags be transparently passed. Which two SAP IDs will accept VLAN tags and pass them transparently? (Choose 2)

A.

sap 1/1/1

B.

sap 1/1/1:0*

C.

sap 1/1/1:0

D.

sap 1/1/1:*

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Question # 8

Which of the following statements regarding unicastand multicast frames is true for a traditional layer 2 switch? (Choose 2)

A.

Multicast frames only forward out ports that have a known receiver.

B.

Unicast frames only forward out ports that have a known receiver.

C.

If the FDB is empty, unicast and multicast frames are treated equally.

D.

If the FDB has an entry for the unicast frame, both unicastand multicast are treated equally.

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Question # 9

In RSTP, which state do all ports initialize in?

A.

Designated

B.

Discarding

C.

Listening

D.

Root

E.

Forwarding

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Question # 10

When a PE node receives a PBB encapsulated frame on a B-VPLS, how does the PE determine which l-VPLS it belongs to?

A.

The l-TAG in the l-SID is inspected to determine where the frame should be delivered.

B.

When the B-MAC header is stripped the customer MAC address is then looked up in the FDB

C.

The l-SID in the l-TAG is inspected to determine where the frame should be delivered.

D.

The PE inspects the service label in the MPLS header before stripping the B-MAC header.

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Question # 11

Click on the exhibit below.

Assume PE-B expects avian tag as part of the RFC 4762 (Martini) encapsulation. How must PE-A be configured?

A.

The port that the SAP belongs to must have the correct ether type configured.

B.

The SAP must be configured with the right VLAN tag.

C.

The SDP VC type must be configured as type VLAN and the correct vlan-vc-tag must be specified.

D.

All of the above.

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Question # 12

An l-VPLS is configured with a service id of 511. What will the value of the l-SID be assuming a default configuration?

A.

The 1-SID must be explicitly configured.

B.

The 1-SID only supports a range from 1 to 255.

C.

The 1-SID will default to 511 .the value of the service-id.

D.

Thel"SIDwilldefaultto131582, the value of the service-id + 131071.

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Question # 13

What function in IEEE 802.1 ah helps to limit the amount of MAC addresses learned in the core?

A.

I-VPLS is configured in the core of the network with an l-MAC address. This l-MAC address is the only MAC learned in the core

B.

The B-VPLS and l-VPLS are configured in the edge. The B-VPLS is configured with a Backbone MAC and is the only MAC learned in the core

C.

Each SDP is configured with a Backbone MAC to hide customer MAC addresses in the core

D.

Each SAP is associated with a common l-MAC to hide customer MAC addresses in the core

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Question # 14

A router has just learned the 10th MAC address while the FDB size is also set to 10. What is the likely outcome?

A.

The frame is dropped.

B.

The frame is always flooded

C.

The frame is forwarded and MAC learning is automatically disabled.

D.

The frame is discarded if the destination is unknown.

E.

More information is required to determine the fate of this new frame.

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Question # 15

Click on the exhibit below.

Which port will become the alternate port?

A.

Bridge B 1/1/3

B.

Bridge B 1/1/2

C.

Bridge C 1/1/2

D.

Bridge C 2/1/1

E.

Bridge D 1/1/1

F.

Bridge D 1/1/3

G.

Bridge E 1/1/1

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Question # 16

A LAG is configured with LACP passive mode enabled. When will LACP packets be sent?

A.

On initialization and then every hello-interval.

B.

Only after receiving LACP packets.

C.

Every 1 second.

D.

Never.

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Question # 17

Click on the exhibit below.

The following VPLS services and SAPs have been configured. Which of the following statements is true?

A.

All untagged frames will be dropped.

B.

The source MAC address of a frame with a top tag of 200 and bottom tag of 300 will be populated in VPLS 3.

C.

All frames with more than one tag will be dropped.

D.

The source MAC address of a frame with a single tag of 500 will be populated in VPLS 1.

E.

The source MAC address of a frame with a top tag of 100 will be populated in VPLS 2.

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Question # 18

Which of the following technologies allows for two explicit VLAN tags to be received from a customer device?

A.

RSVP-TE

B.

SP-VLAN

C.

QinQ

D.

Dot1Q

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Question # 19

What is the name of the feature supported on the Nokia 7750 SR that prevents MAC explosion in large VPLS deployments?

A.

H-VPLS

B.

M-VPLS

C.

PBB

D.

MC-EP

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Question # 20

Which service component in the data plane uniquely identifies a VPLS to the far end PE node?

A.

SDP id

B.

Service ID

C.

VC Label

D.

Tunnel Label

E.

Customer id

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Question # 21

What is the default Spanning Tree protocol used in a VPLS on the Nokia 7750 SR?

A.

802.1D2004

B.

802.1D 1998

C.

comp-dot1w

D.

PVST

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Question # 22

Click on the exhibit below.

You have been requested to add load balancing across the redundant spoke-SDPs in the network shown. What further configuration is required? (Choose 2)

A.

An additional management VPLS.

B.

Another set of LSPs between PE1 and PE3 and between PE2 and PE4.

C.

Another set of SDPs between PE1 and PE3 and between PE2 and PE4.

D.

Load balancing has to be enabled within the management VPLS.

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Question # 23

You are providing a customer two VPLS services in two different Metro networks. VPLS 500 has been configured in Metro 1 and VPLS 900 has been configured in Metro 2. The customer has requested that they have connectivity between the Metro Networks with their existing VPLS services. Which configuration on the PE routers linking the metro networks will allow for VPLS 500 and VPLS 900 to act as a single VPLS service? Assume default values for all VPLS parameters and SDP 999 exists between the metro networks.

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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