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Nokia 4A0-103 Nokia Multi Protocol Label Switching Exam Practice Test

Demo: 37 questions
Total 249 questions

Nokia Multi Protocol Label Switching Questions and Answers

Question 1

Click on the exhibit.

All links have 1 Gbps unreserved bandwidth initially and all LSPs have the least-fill feature enabled. After the two LSPs have been signaled as shown, two additional LSPs are configured.

LSP-3 is signaled first with 50Mbps reserved. LSP-4 is signaled after with 400Mbps reserved.

Which paths will CSPF choose for LSP-3 and LSP-4?

Options:

A.

Both LSP-3 and LSP-4 take R1-R2-R4-R6.

B.

Both LSP-3 and LSP-4 take R1-R3-R5-R6.

C.

LSP-3 takes R1-R3-R5-R6 and LSP-4 takes R1-R2-R4-R6.

D.

LSP-3 takes R1-R2-R4-R6 and LSP-4 takes R1-R3-R5-R6.

E.

CSPF randomly chooses one of the equal cost paths for the two LSPs.

Question 2

Click on the exhibit.

This policy is applied as an LDP export policy. In addition to the FECs learned from its neighbors, which FECs will appear in this router's LIB?

Options:

A.

All FECs with a prefix of 192.168.1.0/30.

B.

Local FECs with a prefix of 192.168.1.0/30.

C.

All FECs excluding 192.168.1.0/30.

D.

Local FECs excluding 192.168.1.0/30.

Question 3

Which of the following about Fast Reroute node protection tunnels is FALSE?

Options:

A.

Node protection tunnels detour around a failed next downstream router.

B.

Node protection tunnels can only be requested for a primary LSP path.

C.

Node protection tunnels are only used by one-to-one Fast Reroute.

D.

Link protection tunnels are established if a router is unable to establish node protection tunnels.

Question 4

Click on the exhibit.

RSVP state for LSP 1 has timed out on router R3. Which of the following actions will router R3 initiate to clear the RSVP session?

Options:

A.

Send a RESV Tear message toward router R6.

B.

Send a RESV Tear message toward router R1.

C.

Send a RESV Error message toward router R6.

D.

Send a RESV Error message toward router R1.

Question 5

Which of the following about an established LDP session is TRUE?

Options:

A.

It uses a UDP connection with an arbitrary port number.

B.

It uses a UDP connection with well-known port number 646.

C.

It uses a TCP connection with an arbitrary port number.

D.

It uses a TCP connection with well-known port number 646.

Question 6

Click on the exhibit.

All links have 1Gbps unreserved bandwidth initially and Shared Explicit reservation style is used. After the LSP's primary and standby secondary paths are signaled, how much unreserved bandwidth is left on the links?

Options:

A.

R1-R2 will have 300Mbps left and R2-R4 will have 400Mbps left.

B.

R1-R2 will have 400Mbps left and R2-R4 will have 400Mbps left.

C.

R1-R2 will have 600Mbps left and R2-R4 will have 600Mbps left.

D.

R1-R2 will have 300Mbps left and R2-R4 will have 600Mbps left.

Question 7

Click on the exhibit.

Router R2 advertises the aggregate prefix 10.10.10.0/24 into Area 1. Why would LDP aggregate-prefix-match be enabled on router R3?

Options:

A.

To reduce the number of LDP sessions

B.

To reduce the number of LIB and LFIB entries

C.

To bypass the LDP exact prefix match rule

D.

To export summarized routes from OSPF to LDP

Question 8

A router has two admin groups defined (GREEN=1 and RED=3). An interface is associated to both admin groups. What value will be shown in the Admin Group sub-TLV for this interface?

Options:

A.

0x4

B.

0x5

C.

0x10

D.

0xa

Question 9

Click on the exhibit.

Which of the following about the bypass tunnel is FALSE?

Options:

A.

The router 10.10.10.1 is a PLR providing node protection for the router 10.10.10.3.

B.

One-to-one fast reroute protection is requested by an LSP.

C.

The bypass-link tunnel is used to avoid the link with the egress interface address 10.3.4.4.

D.

The bypass-node tunnel is used to avoid the next-hop downstream router 10.10.10.3.

Question 10

Click on the exhibit.

Both Path-1 and Path-2 are down. If Path-2 becomes available again, how does the headend router select the secondary LSP path?

Options:

A.

The router will switch to Path-2 because it is the first secondary path configured in the list.

B.

The router will not switch to Path-2 because the current path has the longest uptime.

C.

The router will switch to Path-2 because it is a more preferred path.

D.

The router will not switch to Path-2 because the router will not revert to another secondary path.

Question 11

Which MPLS label mode propagates a label mapping only for the FEC for which a router has a label mapping for the FEC's next-hop?

Options:

A.

Independent control mode

B.

Ordered control mode

C.

Liberal label retention mode

D.

Conservative label retention mode

E.

Downstream on demand label distribution mode

Question 12

If an LSP needs to use an admin group, which of the following configurations is NOT required on the Alcatel-Lucent 7750 SR?

Options:

A.

Assign an admin group to a MPLS interface.

B.

Configure CSPF on the LSP.

C.

Configure at least one strict hop on the LSP path.

D.

Configure an "include" or "exclude" statement on the LSP path.

Question 13

Which of the following best describes downstream on demand label distribution?

Options:

A.

An LSR answers requests for label mappings immediately, without waiting for a label mapping from the next-hop.

B.

An LSR advertises label mappings to all peers for which it might be a next-hop for a given FEC.

C.

An LSR distributes a label mapping for a FEC when it has been requested to do so.

D.

An LSR propagates a label mapping downstream for a FEC. only if it has a label mapping for the FEC's next-hop.

Question 14

Which of the following fields does NOT appear in the MPLS label header?

Options:

A.

Label

B.

Frame check sequence

C.

Traffic Class (previously called Experimental)

D.

Time To live

E.

Bottom of stack bit

Question 15

Click on the exhibit.

An LSP traverses R1-R2-R4-R6 and one-to-one fast reroute with link protection is enabled. All links have the same cost. Which of the following about DMP and MP is TRUE?

Options:

A.

R3 and R5 become DMPs; R6 becomes MP.

B.

R3 and R5 become DMPs; R4 becomes MP.

C.

R3, R5, and R6 become DMPs; R4 becomes MP.

D.

R1, R3, and R5 becomes DMPs; R4 and R6 become MPs.

Question 16

Click on the exhibit.

The partial command output from an Alcatel-Lucent 7750 SR is shown. Which of the following about this LSP path is TRUE?

Options:

A.

R4 (10.10.10.4) has established a link protection tunnel.

B.

R6 (10.10.10.6) has established a link protection tunnel.

C.

R2 (10.10.10.2) has established a node protection tunnel.

D.

R1 (10.10.10.1) has not established a node protection tunnel.

Question 17

Which of the following regarding label population is TRUE?

Options:

A.

Selected labels from the FIB are populated to the LFIB.

B.

Selected labels from the RIB are populated to the FIB.

C.

Selected labels from the LIB are populated to the FIB.

D.

Selected labels from the LIB are populated to the LFIB.

Question 18

Consider a device that uses per-platform label space; which of the following fields is NOT contained in the LFIB?

Options:

A.

Incoming label

B.

Outgoing label

C.

Incoming interface

D.

Outgoing interface

Question 19

Click on the exhibit.

An LDP tunnel is established on R1-R2-R4-R6 because the link between routers R3 and R6 is down. With the LDP-IGP Sync feature enabled, what happens immediately after the link is restored?

Options:

A.

A new LDP session is established on R1-R3-R6 as soon as the FIB is updated.

B.

The LDP session remains unchanged until the existing path R1-R2-R4-R6 goes down.

C.

A new LDP session is established on R1-R3-R6 as soon as router R1 receives a new label for router R6.

D.

The LDP session remains unchanged until router R3 stops advertising the maximum metric for the link to router R6.

Question 20

Which of the following is TRUE when the explicit null is implemented?

Options:

A.

The penultimate router will forward packets to the eLER, based on the IP header.

B.

The eLER will receive packets with a top label value of 0.

C.

The eLER will receive packets with a top label value of 3.

D.

The penultimate router will pop the top label from the packets.

Question 21

Which of the following statements regarding RSVP refresh reduction are true1? (Choose two)

Options:

A.

Message-IDs replace individual refresh messages.

B.

Refresh reduction applies only to reservation messages.

C.

RSVP generates a summary-refresh message for each LSP.

D.

An LSP state change causes an incremented Message-ID.

Question 22

On a point-to-point link, two directly connected routers set different interface hello timeout values. Router R1 uses 15 seconds, while router R2 uses 30 seconds. What happens to the LDP adjacency?

Options:

A.

The adjacency forms with the lower timeout value

B.

The "show router Idp session" command output displays the adjacency in state "init"

C.

The adjacency forms with the higher timeout value

D.

The adjacency times out after 30 seconds

Question 23

When configuring an LSP for fast reroute one-to-one protection, which of the following statements is true?

Options:

A.

The LSP can also use facility backup.

B.

The LSP is limited to node protection.

C.

You cannot request bandwidth on the protected LSP.

D.

Node protection can be disabled.

Question 24

Which of the following best describes constraint-based routing?

Options:

A.

A mechanism that implements opaque LSAs.

B.

A mechanism that computes routes based on defined user requirements.

C.

A mechanism that allows the IGP shortest path to be used.

D.

A mechanism that allows RSVP or LDP signaling to use a route other than the IGP best route to establish a LSP.

Question 25

Which of the following are characteristics of an LSP? (Choose two)

Options:

A.

It is unidirectional.

B.

It is bidirectional.

C.

It must always have a secondary path.

D.

It provides a specific tunnel for a FEC through the network.

E.

It always follows the IGP best path.

Question 26

What is the common usage of the MPLS EXP bits?

Options:

A.

Each implementation can use them as they see fit.

B.

They are used to carry the Ethertype value.

C.

They are used to carry the TTL value.

D.

They are used to carry QoS classification.

E.

They are used to carry fragmentation flag information

Question 27

Which of the following message types does RSVP use to set up an LSP? (Choose two)

Options:

A.

Path message

B.

iLER message

C.

Resv message

D.

LSP setup call request

E.

eLER message

Question 28

Which of the following statements best describes downstream unsolicited label distribution?

Options:

A.

An LER may answer requests for label mappings immediately, without waiting for a label mapping from the next-hop.

B.

An LER may advertise label mappings to all peers for which it might be a next-hop for a given FEC.

C.

An LER propagates a label mapping downstream for a FEC. only if it has a label mapping for the FEC next-hop.

D.

An LER will only distribute a label for a FEC when it has been requested to do so.

Question 29

Assume that, on the Alcatel-Lucent 7750 SR, an LSP is configured with one-to-one FRR and node protection. Which of the following statements are FALSE? (Choose two)

Options:

A.

Each PLR signals a detour LSP that avoids the downstream node. If the downstream node cannot be avoided, a detour LSP that avoids the downstream link is signaled.

B.

The detour LSP can take one or more hops before merging back on the protected LSP.

C.

The merge point of the protected LSP must be the next-next-hop node

D.

The ingress router will set the local protection desired flag in the session attribute object of the path message to inform all routers along the protected LSP path to establish detour LSPs.

E.

The label recording desired flag must be set in the session attribute object in order for the PLR to know what label to swap when using the detour LSP.

Question 30

Which of the following prerequisites must you configure on a router to enable LDP-over-RSVP support? (Choose two)

Options:

A.

Configure the T-LDP peers for tunneling.

B.

Configure tunneled T-LDP sessions between PE routers.

C.

Enable Idp-over-rsvp in the IGP configuration on the PEs and ABRs

D.

Enable LSP stitching on the RSVP LSPs

Question 31

Two directly connected routers set different interface Hello timeout values. Router R1 uses 15 seconds, while router R2 uses 30 seconds. Which of the following best describes the LDP adjacency?

Options:

A.

The adjacency forms with the lower timeout value.

B.

The adjacency forms with the higher timeout value.

C.

The adjacency is in init state.

D.

The adjacency times out after 30 seconds.

Question 32

What MPLS function should be performed by a router that receives a data packet containing an MPLS label value of 3?

Options:

A.

A router will never receive a packet containing this label value.

B.

Request a new label from the peer that provided this label.

C.

Pop the label.

D.

PUSH an additional label onto the label stack.

E.

Signal a new label to the peer that sent the packet.

Question 33

Which of the following timers can be adjusted to reduce the time a router waits between attempts to re-establish an LSP after it has failed?

Options:

A.

Isp retry-timer

B.

Isp retry-limit

C.

mpls resignal-timer

D.

rsvp refresh-time

E.

router rsvp keep-multiplier

Question 34

Click on the exhibit button below. Assume the following:

- The protected path is R1-R2-R3-R6.

- Fast reroute one-to-one protection is enabled.

If the original LSP already has two labels, and router R2 has failed, how many labels will there be in packets on the detour path?

Options:

A.

1

B.

2

C.

3

D.

4

Question 35

Which of the following about T-LDP is FALSE?

Options:

A.

Link-based and T-LDP sessions may be configured on the same LSR.

B.

T-LDP supports sessions between non-directly connected devices.

C.

T-LDP can be configured between directly connected devices.

D.

T-LDP Hello messages are sent to a multicast address.

Question 36

Click on the exhibit.

Under which condition might the peer entry with an LDP ID of 10.10.10.2:0 show the state "Nonexistent"?

Options:

A.

When the interface to the peer router is down.

B.

When router R1 has no route to the peer address 10.10.10.2.

C.

When LDP is not configured on the peer router's interface.

D.

When the targeted session is not configured.

Question 37

Click on the exhibit button below.

Consider the output shown; why is the label in bold font not in use?

Options:

A.

The router cannot do a SWAP of this label.

B.

The label does not match the egress label for the same FEC.

C.

The label is for a FEC for which the next-hop is the peer router

D.

The label was signaled in error.

Demo: 37 questions
Total 249 questions