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4A0-105 Nokia Virtual Private LAN Services Questions and Answers

Questions 4

What is the maximum number of VLANs supported on a traditional Layer 2 switch?

Options:

A.

4094

B.

8190

C.

32768

D.

131071

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Questions 5

What scaling factors should a network engineer be aware of when designing VPLS networks? (Choose 3)

Options:

A.

Control plane scaling.

B.

Data plane scaling.

C.

Network touches.

D.

Route table reduction.

E.

OAM tools.

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Questions 6

Which element of IEEE 802.1ag is responsible for initiating CFM messages?

Options:

A.

MEP

B.

MAP

C.

MIP

D.

MUP

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Questions 7

Click on the exhibit below.

If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the VPLS?

Options:

A.

Only R4 will be reachable through the VPLS.

B All devices will be reachable through the VPLS.

B.

R4 and R3 will remain reachable.

C.

No devices will be reachable.

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Questions 8

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

Options:

A.

H-VPLS

B.

M-VPLS

C.

PBB

D.

MC-EP

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Questions 9

How does the IEEE 802.1ag loopback function differently from the loopback feature in 802.3ah? (Choose 2)

Options:

A.

Theloopbackfuntionin802.1ag is an intrusive test that will stop customer data.

B.

The loopback function of 802.lag is a non-intrusive "ping" sent from a MEP to a remote MEP or MIP.

C.

The loopback function in 802.3ah is an intrusive test that will loop customer data.

D.

The loopback function of 802.lag is an intrusive test that will "loop" all customer data back to the original sender.

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Questions 10

Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose 2)

Options:

A.

The time to relearn thousands of MAC addresses may result in excessive flooding or loss of packets.

B.

If the FDB reaches the limit, the router will discard frames.

C.

Discarding frames when the FDB limit is reached could deny SLA guarantees.

D.

It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA guarantees.

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Questions 11

Click on the exhibit below.

Based on the output below which of the following statements is true? (Choose 2)

Options:

A.

VPLS1500 is a user VPLS.

B.

VPLS 1500 is management VPLS.

C.

Spanning tree BPDUs for the management VPLS are tagged.

D.

Spanning tree BPDUs for the management VPLS are untagged.

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Questions 12

In RSTP, an alternate port is on the same switch as a designated Port.

Options:

A.

TRUE

B.

FALSE

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Questions 13

Why is it best practice to set the bridge priority in an STP network? (Choose 2)

Options:

A.

This is not a best practice. Any switch can be used as the root bridge.

B.

So that you know which links will be active in your network.

C.

To prevent a new switch from becoming root when added to the network.

D.

To allow all ports on the root switch to become alternate ports.

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Questions 14

What needs to be configured in a VPLS in order to forward customer STP BPDUs transparently?

Options:

A.

Spanning tree must be enabled within the VPLS.

B.

Spanning tree BPDUs must be untagged.

C.

Spanning tree BPDUs must be tagged.

D.

Spanning tree must be disabled within the VPLS.

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Questions 15

Click on the exhibit below.

Which ports will become root ports? (Choose 3)

Options:

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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Questions 16

What is the result of initiating an oam mac-ping to an unknown unicast MAC address in a VPLS instance?

Options:

A.

The oam mac-ping will fail. The MAC address must be known in the local FDB to be successful.

B.

The request will be flooded and the only response will come from the PE node that has learned the specified MAC address on a local SAP.

C.

The request will be flooded and the CE device with the corresponding MAC will reply.

D.

All nodes will reply because the oam mac-ping is flooded.

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Questions 17

Click on the exhibit below.

If the device connected to PE-A in Metro A sends a frame to PE-A that requires replication within the VPLS which devices is PE-A responsible for replicating the frame to?

Options:

A.

PE-A must replicate the frame to all devices participating in the VPLS

B.

PE-A must replicate the frame to all PEs within Metro A

C.

PE-A must replicate the frame to all devices in the Metro A

D.

All of the above

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Questions 18

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

Options:

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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Questions 19

Click on the exhibit below.

A new router named PE-D is to be directly connected to PE-C and is required to be added to the existing VPLS 300. The design requires the least amount of signaling, the least amount of configuration changes for existing sites and the new site has to have access to all existing sites. How should the new site be added to VPLS 300?

Options:

A.

Configure a mesh-sdp between all existing PE routers and the new PE router

B.

Configure a mesh-sdp between PE-C and PE-D

C.

Configure a spoke-sdp between PE-C and PE-D.

D.

It is not possible to meet the design requirements.

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Questions 20

Which of the following are required for an operational mesh-sdp binding for bidirectional traffic when signaling is enabled within the SDP? (Choose 3)

Options:

A.

LDP must be enabled.

B.

RSVP must be enabled.

C.

An SDP must be configured on the far-end.

D.

Service MTU must match.

E.

SDP ID must match.

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Questions 21

After the "disable-learning" command has been executed at the VPLS level, a new client device originates a frame. What is the result?

Options:

A.

If the MAC address of this new client device does not reach the upper limit of the configured total number of MAC addresses allowed in the VPLS forwarding database, then the new MAC address will be stored.

B.

The new source MAC addresses will not be entered in the VPLS service forwarding database.

C.

New local source MAC addresses will not be entered in the VPLS service forwarding database, but new remote MAC addresses would continue to be entered.

D.

New remote source MAC addresses will not be entered in the VPLS services forwarding database, but new local MAC addresses would continue to be entered.

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Questions 22

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

Options:

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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Questions 23

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

Options:

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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Exam Code: 4A0-105
Exam Name: Nokia Virtual Private LAN Services
Last Update: Apr 28, 2024
Questions: 156
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