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4A0-C04 Nokia NRS II Composite Exam: OSPF version Questions and Answers

Questions 4

Which utility on the Nokia 7750 SR can be used to investigate an MPLS path?

Options:

A.

Isp-trace

B.

Idp-trace

C.

Sdp-ping

D.

Svc-ping

E.

Ping

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Questions 5

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.

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Questions 6

Which of the following is NOT a benefit of "Hub and Spoke'' VPLS deployments?

Options:

A.

They reduce the number of SDPs that need to be configured.

B.

They can be used to work around physical topologies that prevent a fully meshed deployment.

C.

They prevent loops that can be introduced by mesh deployments.

D.

They can simplify the implementation of security policy enforcement and packet inspection.

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Questions 7

What causes an adjacency to change from down to two ways?

Options:

A.

When a link state update is received in response to a link state request.

B.

When a router receives a Hello packet that contains its own router ID in the neighbor list from a neighbor.

C.

When a router receives a database description packet from a neighbor.

D.

When a link state acknowledgement is received in response to a link state update.

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Questions 8

Which of the following about LDP sessions is TRUE?

Options:

A.

Frame mode requires multiple sessions between peers.

B.

The lower transport address initiates the session.

C.

Established LDP sessions run over a TCP connection.

D.

An LDP session is established immediately after Init messages are exchanged between peers.

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Questions 9

To enable the LDP-over-RSVP feature, which of the following configurations is NOT required on an Nokia 7750 SR?

Options:

A.

Enable the Idp-over-rsvp feature on all PEs and ABRs along the LSP tunnel.

B.

Configure Link-LDP sessions between each PE-ABR and ABR-ABR pair.

C.

Configure RSVP-TE LSPs in each area between each PE-ABR and ABR-ABR pair.

D.

Configure T-LDP sessions with the tunneling option.

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Questions 10

Click the exhibit.

Assuming that none of the routers within AS 65200 is configured with next-hop-self", what will the BGP update for the 192.168.0.1/27 prefix contain when it arrives at router B?

Options:

A.

AS Path of 65200 65100, Next Hop of router A.

B.

AS Path of 65200 65100, Next Hop of router E.

C.

AS Path of 65100, Next Hop of router E.

D.

AS Path of 65100, Next Hop of router A.

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Questions 11

Which of the following about transport and service tunnels is FALSE?

Options:

A.

Service tunnels are unidirectional.

B.

Transport tunnels are unidirectional.

C.

A service will use the same service label for every hop.

D.

A local service requires a transport tunnel.

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Questions 12

Which of the following best describes the type of packets used by OSPF routers to exchange updates on a point-to-point link?

Options:

A.

IP packets sent to an IP multicast address.

B.

TCP packets sent to an IP multicast address.

C.

IP packets sent to an IP unicast address.

D.

UDP packets sent to an IP multicast address.

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Questions 13

How are policy direction and data flow related on the Nokia 7750 SR?

Options:

A.

Import policies affect ingress data flow.

B.

Export policies affect ingress data flow.

C.

Both import and export policies affect ingress data flow.

D.

Policy direction and data flow are independent.

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Questions 14

What happens by default on an Nokia 7750 SR when a null encapsulated SAP receives a frame with a VLAN tag?

Options:

A.

The original VLAN tag is removed.

B.

The original VLAN tag is kept.

C.

The VLAN tag is replaced by a provider tag.

D.

The VLAN tag is kept and a provider tag is added.

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Questions 15

Which of the following devices inspects the MPLS header in the received packet, and exchanges it for a new MPLS header?

Options:

A.

iLER

B.

LER

C.

LSR

D.

PE

E.

eLER

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Questions 16

Click the exhibit button.

Router R2 advertises the network 192.168.3.0/24 to router R1 via OSPF. A route policy has been constructed to discard the route on router R1; however, it is not working. What is the problem?

Options:

A.

The prefix list reject should be "192.168.3.0/16 exact".

B.

Router R1 should be configured as an OSPF "asbr".

C.

The policy "reject" should be set for import rather than export.

D.

The policy was likely not "committed" after creation.

E.

This is not possible because OSPF cannot use import policies.

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Questions 17

Which of the following messages is NOT used in T-LDP operation?

Options:

A.

Hello message

B.

Init message

C.

Keepalive message

D.

Label Mapping message

E.

ACK message

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Questions 18

Click on the exhibit.

An LSP path is established on router R1 toward router R6. If there is a problem on router R4, but the link between R2 and R4 remains up, which of the following will affect the failure detection time?

Options:

A.

The time router R2 takes to receive a PATH Error message from router R4.

B.

The time router R2 takes to find out a number of RSVP Hello messages have been missed.

C.

The time router R2 takes to send a PATH Tear message to the head-end router.

D.

The time router R2 takes to receive a PATH message from router R4 after a PATH refresh interval.

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Questions 19

Click on the exhibit.

A fully loose LSP "toR6" is configured. All links have the same cost and all routers are Nokia 7750 SRs. The LSP currently traverses the path R1-R2-R7-R8-R4-R6 and the resignal timer is enabled. Which of the following about this LSP is FALSE?

Options:

A.

The LSP will switchover to another path if a failure occurs.

B.

The LSP will switchover to a better path as soon as it is available.

C.

CSPF must be enabled for this LSP to attempt to find a better path.

D.

The LSP will switchover to a better path in a MBB fashion.

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Questions 20

On Nokia 7750 SR OS, routing information between the CE and PE can be exchanged using the following methods.

Options:

A.

ISIS, RIP, OSPF, static routes

B.

BGP, ISIS, RIP, OSPF, static routes

C.

BGP, RIP, OSPF, static routes, OSPF3

D.

ISIS, RIP, OSPF, static routes, OSPF3

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Questions 21

Click on the exhibit.

This policy is applied on a router as an LDP export policy and an LDP session has been established between this router and its neighboring router. In addition to the FECs learned from its neighbors, what additional FECs will appear in this router's LIB?

Options:

A.

All FECs that are in the 192.168.1.0/24 address space.

B.

Local FECs that are in the 192.168.1.0/24 address space.

C.

All FECs that are not in the 192.168.1.0/24 address space.

D.

All FECs except the local FECs that are in the 192.168.1.0/24 address space.

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Questions 22

Which of the following about the Isp-ping command on the Nokia 7750 SR is FALSE?

Options:

A.

An echo request is sent based on the LSP's label stack.

B.

Echo reply packets may not take the same path as the LSP.

C.

The IP destination address is used to initiate echo requests,

D.

The test fails if the LSP is not operationally up.

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Questions 23

Which of the following about label modes on the Nokia 7750 SR is FALSE?

Options:

A.

RSVP uses downstream on demand label distribution mode.

B.

LDP uses conservative label retention mode.

C.

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

D.

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

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Questions 24

What kind of attribute is the aggregator?

Options:

A.

Well-known mandatory

B.

Well-known discretionary

C.

Optional transitive

D.

Optional non-transitive

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Questions 25

Click on the exhibit.

The path of a fast reroute protected LSP is R1-R2-R3. Which of the following about the protected LSP path is TRUE?

Options:

A.

All routers along the path, R1, R2, and R3 can be PLRs.

B.

If the R1-R2 link fails, router R4 becomes an MP.

C.

If the R2-R3 link fails, router R3 becomes a PLR.

D.

Router R1 is the LSP head-end and can be a PLR.

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Questions 26

Which of the following is NOT a goal of BGP routing policies?

Options:

A.

To protect external networks from instability.

B.

To communicate the architecture of an AS to external ASs.

C.

To protect the local AS and other external ASs from bad NLRI.

D.

To optimize ingress and egress traffic patterns to best serve the users of the AS.

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Questions 27

Which MPLS label mode saves label mappings received from all peer LSRs?

Options:

A.

Conservative label retention

B.

Liberal label retention

C.

Downstream on demand

D.

Downstream unsolicited

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Questions 28

Click the exhibit.

When router A receives the BGP update for the 192.168.0.1/27 prefix, it propagates it to routers B and C. What action is taken by router B when it receives the update?

Options:

A.

Router B propagates the BGP update to routers D and C.

B.

Router B propagates the BGP update to router D.

C.

Router B detects duplicates in its BGP database and discards the update.

D.

Router B propagates the update to routers A, C and D.

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Questions 29

What are the ways the RID can be created on an Nokia 7750 SR router? (Choose three)

Options:

A.

From the last 32 bits of the chassis MAC address

B.

From the first 32 bits of the chassis MAC address

C.

The loopback IP address

D.

By using the command "config router ospf rid X.X.X.X"

E.

From the system IP address

F.

From the highest interface IP address

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Questions 30

What is the default preference value for a static route in the Nokia 7750 SR?

Options:

A.

0

B.

5

C.

10

D.

15

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Questions 31

Click the exhibit.

Assuming the network is IPv6 only, which of the following configurations on the Nokia

7750 SR router A can establish an IPv6 BGP session to router B?

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 32

How is the aggregator attribute handled with 32-bit AS numbers?

Options:

A.

With the same method and attribute as 16-bit AS numbers.

B.

With the same method as 16-bit AS numbers, but using the AS4_Aggregator attribute.

C.

Aggregation is not yet supported with 32-bit AS numbers.

D.

By using a dummy value of 23456 in the 16-bit AS aggregator field. This value lets the router know it needs to read the 32-bit AS number that is contained in the nextTLV.

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Questions 33

Click the exhibit button.

In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. Which of the following statements regarding the OSPF LSAs in the network is true?

Options:

A.

Router R1 generates a type 5 LSA that is flooded through all OSPF areas.

B.

Router R1 generates a type 7 LSA that is flooded through all OSPF areas.

C.

Router R1 generates a type 5 LSA that is flooded through area 1. Router R2 generates a type 7 LSA that is flooded through areas 0 and 2.

D.

Router R1 generates a type 7 LSA that is flooded through area 1. Router R3 generates a type 5 LSA that is flooded through areas 0 and 2.

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Questions 34

Fill in the blanks: A ________device has all interfaces inside the provider domain, and a _______ device has at least one interface outside the provider domain.

Options:

A.

PE, P

B.

P, PE

C.

PE, CE

D.

CE, PE

E.

CE, P

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Questions 35

Click on the exhibit.

RSVP session 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 PATH Tear message toward router R6.

B.

Send a PATH Tear message toward router R1.

C.

Send a PATH Error message toward router R6.

D.

Send a PATH Error message toward router R1.

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Questions 36

Two Nokia 7750 SRs are established BGP peers with the following add-paths configuration:

R1: configure router bgp add-paths ipv4 send 4 receive

R2: configure router bgp add-paths ipv4 send 2

If router R1 advertises three routes for a given prefix X, how many routes is router R2 expected to have for prefix X?

Options:

A.

None

B.

2

C.

3

D.

4

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Questions 37

Which of the following regarding BGP Path Identifier is FALSE?

Options:

A.

Path-ID is a four-octet identifier pre-pended to the NLRI field of a BGP update.

B.

Path-ID is an optional transitive attribute used to advertise multiple paths.

C.

Path-ID uniquely identifies each path advertised to a neighbor.

D.

A BGP speaker that re-advertises a route must generate its own Path-ID.

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Questions 38

Which of the following statements about the BGP Advertise External feature is FALSE?

Options:

A.

It modifies the BGP advertisement logic.

B.

It improves convergence times and allows for better load sharing.

C.

It allows a router to advertise multiple external paths for a single prefix.

D.

It supports both IPv4 and IPv6.

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Questions 39

Which of the following about the Link LDP discovery process on the Nokia 7750 SR is FALSE?

Options:

A.

LDP Hello messages are sent over TCP.

B.

LDP Hello messages are sent to the All Routers address 224.0.0.2.

C.

LDP Hello messages are exchanged between all directly connected LDP enabled routers.

D.

Each LDP enabled router must have its own unique system IP address.

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Questions 40

An SDP using GRE encapsulation is configured for an E-pipe service. The network port used by the SDP has an MTU of 8000. What value does the SDP path MTU have by default on an Nokia 7750 SR?

Options:

A.

7958

B.

7978

C.

8022

D.

8042

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Questions 41

Which of the following LSA types stay within an OSPF area, and are not flooded outside of the area? Choose two answers.

Options:

A.

Router LSA

B.

Network LSA

C Summary network LSA

C.

Summary router LSA

D.

Type 5 (AS external) LSAs

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Questions 42

An E-pipe is configured with a service MTU of 5000. What is the minimum MTU value that should be set on an access port for a dot1q encapsulated SAP on this service?

Options:

A.

5000

B.

5004

C.

5008

D.

5014

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Questions 43

Click on the exhibit.

When router R1 forwards a PATH message to router R2, which of the following about the PATH message's IP header is TRUE?

Options:

A.

The options field is set to router alert.

B.

The source address is R1's egress interface address.

C.

The destination address is R2's ingress interface address.

D.

The HOP object includes R2's system address.

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Questions 44

What is the default Nokia 7750 SR TTL of a BGP advertisement between confederation members?

Options:

A.

1

B.

32

C.

64

D.

255

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Exam Code: 4A0-C04
Exam Name: Nokia NRS II Composite Exam: OSPF version
Last Update: Dec 4, 2024
Questions: 298
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