Question 1 ( Topic 1 )
You wish to advertise LDP labels for all local networks; which is the most effective policy statement to use?
A. from prefix-list direct
B. match local
C. from protocol direct
D. match protocol direct
E. from protocol local
Answer : C
Question 2 ( Topic 1 )
Which of the following indicates the path over which an LSP's tail end router will return an
RSVP RESV message?
A. The IGP FIB.
B. The Reservation State Block (RSB)
C. The Path State Block (PSB)
D. The opaque database.
Answer : C
Question 3 ( Topic 1 )
Click on the exhibit button below.
With fast reroute enabled, and given the following:
-> Two protected LSPs with the path R1-R2-R3
-> Both LSPs enable facility bypass and link protection.
When router R1 is the PLR, which router becomes the MP?
A. Router R1
B. Router R2
C. Router R3
D. Router R4
E. Router R5
Answer : B
Question 4 ( Topic 1 )
Click on the exhibit button below.
Given the output below, which of the following statements are true? (Choose three)
A. A packet arriving with label 131066 and destined for prefix 10.10.10.243/32 will be forwarded out interface 1/1/4, with label 131070.
B. LDP ECMP is enabled.
C. The router’s system address is 10.10.10.242/32.
D. There are multiple LSPs to reach FEC 10.10.10.244/32.
E. The router cannot receive any unlabeled packets destined for prefix 10.10.10 223/32.
Answer : A,B,D
Question 5 ( Topic 1 )
Which of the following statements best describe MPLS fast reroute characteristics?
(Choose two)
A. Fast reroute requires you to manually define detour paths.
B. Fast reroute provides path protection close to the failure point
C. Fast reroute performs automatic path calculation and signaling.
D. Fast reroute protects both primary and secondary paths.
Answer : B,C
Question 6 ( Topic 1 )
During node protection signaling, the PLR knows the address of the MP from which of the following methods?
A. The PLR issues a RSVP path message to the destination router to request the address of the MP.
B. The PLR learns the address of the MP from the ERO.
C. The PLR learns the address of the MP from the RRO
D. The PLR learns the address of the MP from the targeted RSVP hello message.
E. The PLR does not need to know the address of the MP.
Answer : C
Question 7 ( Topic 1 )
What is the significance of receiving a packet with the bottom MPLS label S bit set to 1?
A. It results in forwarding based on the next packet header.
B. It indicates that the label is the bottom of the MPLS label stack.
C. It indicates that the label is the top of the MPLS label stack.
D. Any LSR that receives an S bit set to 1 must discard the packet.
Answer : B
Question 8 ( Topic 1 )
Which command can be used to verify the LDP settings for label distribution and retention?
A. show router ldp default
B. show router ldp parameters
C. show router ldp settings
D. show router mpls settings
E. show router mpls label-options
Answer : B
Question 9 ( Topic 1 )
Router R3 signals an LSP, reserving 1Gbps bandwidth on a 10Gbps link. RSVP configuration limits reservable bandwidth to 20 percent on the egress interface. Which of the following statements is true?
A. The egress RSVP interface has 80 percent bandwidth unreserved.
B. LSPs can reserve an additional 9.9 Gbps bandwidth on this RSVP interface.
C. The head end reserves 100Mbps for the LSP
D. The egress RSVP interface has 1 Gbps bandwidth unreserved.
Answer : D
Question 10 ( Topic 1 )
Click on the exhibit button below.
Assuming that LSP R1-R2-R3 requests the default fast reroute configuration, which router becomes a DMP for the detour tunnels?
A. Router R1
B. Router R2
C. Router R3
D. Router R4
E. Router R5
Answer : E
Question 11 ( Topic 1 )
Which of the following message types does RSVP use to set up an LSP? (Choose two)
A. Path message
B. iLER message
C. Resv message
D. LSP setup call request
E. eLER message
Answer : A,C
Question 12 ( Topic 1 )
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)
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.
Answer : C,E
Question 13 ( Topic 1 )
Click on the exhibit button below.
With fast reroute enabled, and given the following:
-> The protected LSP path is R1-R2-R3.
-> All links are of equal cost.
Which of the following statements is true? (Choose two)
A. Router R1 is the LSP originator and is also a PLR.
B. With one-to-one link or node protection, the detour LSP path is R1-R4-R5-R2-R3.
C. With one-to-one link or node protection, the detour LSP path is R1-R4-R5-R3.
D. If the R2-R3 link fails, router R3 becomes a PLR
E. None of the nodes can be protected with FRR.
Answer : A,C
Question 14 ( Topic 1 )
Which of the following statements regarding LSP path configuration are true? (Choose three)
A. The path must include at least one hop.
B. The path may be used multiple times in a single LSP.
C. The path may comprise loose hop entries only.
D. The path must define the LSP's tail end.
E. The path may be used for multiple LSPs.
Answer : C,E
Question 15 ( Topic 1 )
Click on the exhibit button below.
Consider the following:
-> Routers R1 and R4 are in Area 1.
-> Routers R4 and R5 in Area 0.
-> Routers R5 and R3 are in Area 2.
To support LDP-over-RSVP tunnels between routers R1 and R3 over path R1-R4-R5-R3, with which routers will router R5 require targeted sessions? (Choose two)
A. Router R1
B. Router R4
C. Router R2
D. Router R3
Answer : B,D
Question 16 ( Topic 1 )
Which of the following statements best describes downstream unsolicited label distribution?
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.
Answer : B
Question 17 ( Topic 1 )
In MPLS, labels are distributed in the opposite direction of the data flow.
A. TRUE
B. FALSE
Answer : A
Question 18 ( Topic 1 )
Click on the exhibit button below.
Given the configuration below, what is the system ID of the destination node?
A. 10.32.1.2
B. 10.1.478
C. 1048.1.1
D. Cannot tell from this configuration
E. 10.1.2.2
Answer : B
Question 19 ( Topic 1 )
Which of the following is defined by the following statement? All label mappings received from all peer LSRs are saved.
A. Conservative label retention
B. Liberal label retention.
C. Downstream on demand.
D. Downstream unsolicited.
Answer : B
Question 20 ( Topic 1 )
What is the common usage of the MPLS EXP bits?
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
Answer : D
Question 21 ( Topic 1 )
If an LSP's loose primary path includes the statement "include green" and "exclude red;" how does CSPF choose the LSP's path?
A. CSPF chooses a link that is a member of both administrative groups
B. CSPF chooses only those links that are NOT members of the green admin group
C. CSPF prunes the green links and uses these links for the secondary path
D. CSPF signals the LSP path over the green links only, and prunes all other links
Answer : D
Question 22 ( Topic 1 )
Click on the exhibit button below.
Given the configuration below, which of the following scenarios is FALSE?
A. Both the primary and secondary paths are explicitly defined.
B. The primary path is active and the secondary path is in hot standby.
C. The LSP defined will use the primary path and will signal the secondary path to become active if the primary path fails.
D. The LSP has the same source and destination for both primary and secondary paths.
Answer : B
Question 23 ( Topic 1 )
Which of the following commands may only be used on the head end router to verify the status of an LSP named "LSP 1"? (Choose two)
A. show router mpls Isp "LSP 1" originate
B. show router mpls Isp "LSP 1" path detail
C. show router rsvp session originate
D. show router rsvp session "LSP 1"
Answer : B,C
Question 24 ( Topic 1 )
Which of the following are the default settings for the Alcatel-Lucent 7750 SR when using
LDP?
A. Ordered control mode; downstream on demand.
B. Ordered control mode; downstream unsolicited.
C. Independent control mode; downstream on demand.
D. Independent control mode; downstream unsolicited.
Answer : B
Question 25 ( Topic 1 )
Which default LDP parameter are you able to change with CLI?
A. Label space mode
B. Label retention
C. Control mode
D. Keepalive factor
Answer : D
Question 26 ( Topic 1 )
Which of the following are characteristics of an LSP? (Choose two)
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.
Answer : A,D
Question 27 ( Topic 1 )
In MPLS, at which device are packets assigned to a FEC?
A. LSR
B. LER
C. eLER
D. iLER
E. CE
Answer : D
Question 28 ( Topic 1 )
When configuring an LSP for fast reroute one-to-one protection, which of the following statements is true?
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.
Answer : D
Question 29 ( Topic 1 )
Which of the following are functions of the MPLS control plane in a router? (Choose two)
A. Label allocation and management.
B. Label swapping.
C. Pushing a label on an unlabeled packet.
D. Label signaling.
E. Routing lookups.
Answer : A,D
Question 30 ( Topic 1 )
Which of the following statements regarding RSVP refresh reduction are true1? (Choose two)
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.
Answer : A,D
Question 31 ( Topic 1 )
Which of the following reservation styles can be used to prevent both the primary and secondary paths from booking resources on a common link?
A. Fixed filter
B. Shared explicit
C. Standby explicit LSP
D. Preemptive filter
E. Link capacity filter
Answer : B
Question 32 ( Topic 1 )
Which of the following statements regarding RSVP-TE is FALSE?
A. RSVP-TE operates in a downstream unsolicited label advertisement mode.
B. RSVP-TE makes use of ordered control mode.
C. RSVP-TE is an MPLS signaling protocol, based on the resource reservation protocol.
D. RSVP-TE enables the establishment of explicitly routed LSPs that can be automatically routed away from network failures
E. RSVP-TE supports explicitly routed LSPs using either loose or strict route definitions.
Answer : A
Question 33 ( Topic 1 )
Click on the exhibit button below:
Consider the following:
- Router R2 is an ABR in OSPF Areas 0 and 1.
- Router R2 advertises the aggregate prefix 10.10.10.0/24 into Area 1.
- Router R1 in Area 0 generates LDP labels for FECs 10.10.102/31 and 10.10.10.4/31
Router R3 in Area 1 places these FECs in its LIB, but it does not place them in its LFIB.
What can you do on router R3 to make it populate these labels in its LFIB?
A. Disable route summarization on router R3
B. Enable LDP aggregate prefix match
C. Create an import policy to accept these FECs
D. Disable LDP exact match on the specified FECs
Answer : B
Question 34 ( Topic 1 )
An LSP path is configured as follows:
- Shared-explicit reservation style
- Make-before-break (MBB) enabled
- 500Mpbs bandwidth reserved on a 1Gbps link
With 100Mbps of unreserved bandwidth remaining, the operator increases the LSP-path's bandwidth reservation to 900Mbps. What happens to the existing LSP?
A. CSPF looks for the delta bandwidth, taking down the first path if necessary.
B. CSPF looks for the delta bandwidth, implementing make-before-break.
C. After 5 failed attempts to find the bandwidth requested, the head end disables the LSP.
D. CSPF looks for the entire bandwidth requested, implementing MBB.
Answer : B
Question 35 ( Topic 1 )
Which approach to LSP path diversity provides the most control, but the least flexibility?
A. Administrative Groups
B. Shared Risk Link Groups
C. Strict hop LSP paths
D. Fast reroute
Answer : C
Question 36 ( Topic 1 )
If an Alcatel-Lucent 7750 LSR receives a labeled packet with a outer label TTL of 250 and an inner label TTL of 251, which of the following statements is true?
A. The packet will be label switched; the outer label TTL will be 249 and the inner label TTL will be 250.
B. The packet will be label switched; the outer label TTL will be 249 and the inner label TTL will be 251.
C. The packet will be label switched; both the outer label TTL and the inner label TTL will be 250.
D. The packet will be label switched; both the outer label TTL and the inner label TTL will be 249, because they must be the same.
Answer : B
Question 37 ( Topic 1 )
Which of the following statements best defines an LSP?
A. An LSP is a bidirectional path across the MPLS domain.
B. An LSP is a bidirectional path for a particular FEC across the MPLS domain.
C. An LSP is a unidirectional path across the MPLS domain.
D. An LSP is a bidirectional path between adjacent LSRs.
E. An LSP is a unidirectional path between adjacent LSRs.
Answer : C
Question 38 ( Topic 1 )
Click on the exhibit button below.
Given the following fast reroute protected LSPs:
-LSP1.R1-R4-R5-R3
-LSP2.R1-R4-R5-R2
Which routers become bypass tunnel PLRs? Choose two answers
A. Router R1
B. Router R2
C. Router R3
D. Router R4
E. Router R5
Answer : A,E
Question 39 ( Topic 1 )
You wish to build an LSP originating on router R1, transiting the path R1-R2-R4-R5-R6, and terminating on router R6. How many strict hops would you define in your path statement?
A. 4
B. 1
C. 5
D. 6
Answer : A
Question 40 ( Topic 1 )
Which of the following statements regarding the last two octets of the LDP identifier is true?
A. It is always a random 16-bit number.
B. It is always zero for per-interface label space.
C. It is always non-zero.
D. It is always zero for per-platform label space.
E. It is always non-zero for per-platform label space.
Answer : D
Question 41 ( Topic 1 )
Which of the following prerequisites must you configure on a router to enable LDP-over-
RSVP support? (Choose two)
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
Answer : A,C
Question 42 ( Topic 1 )
Which of the following statements regarding RSVP path messages on an Alcatel-Lucent
SR is true?
A. The path message's IP header options field sets the router alert option.
B. The IP header source address is the sender's egress interface address.
C. The IP header destination address is the next-hop interface address.
D. The IP header HOP object reflects the upstream router's egress interface address.
Answer : A
Question 43 ( Topic 1 )
What is the function of the MPLS label assigned to a packet?
A. It identifies the FEC.
B. It specifies the packet's header length
C. It identifies the origin of the packet.
D. It specifies the type of data contained in the packet
Answer : A
Question 44 ( Topic 1 )
Which of the following statements regarding DiffServ-TE LSPs is true?
A. The Maximum Allocation Model (MAM) provides the most efficient bandwidth utilization model
B. In the Maximum Allocation Model (MAM), each CT receives dedicated bandwidth constraints.
C. In the Russian Doll Model (RDM), a CT2 LSP automatically preempts a CT1 LSP.
D. Using the Russian Doll Mode! (RDM), a CT1 LSP may use unreserved CTO bandwidth.
Answer : B
Question 45 ( Topic 1 )
Which of the following routing protocols are supported on the Alcatel-Lucent 7750 SR to enable constraint-based LSPs? (Choose two)
A. RIPv2-TE
B. CSPF
C. OSPF-TE
D. ISIS-TE
E. RSVP-TE
Answer : C,D
Question 46 ( Topic 1 )
Which of the following statements is true when the implicit null is implemented?
A. The penultimate router will POP the top label from the packets.
B. The eLER will receive packets with a top label value of 3.
C. The eLER will receive packets with a top label value of 0.
D. The penultimate router will always receive unlabeled packets.
E. The penultimate router performs a double lookup on the packet.
Answer : A
Question 47 ( Topic 1 )
Which of the following is described by the following statement? An LSR propagates a label mapping only for a FEC for which it has a label mapping for the FEC next-hop.
A. Independent control mode
B. Ordered control mode
C. Liberal label retention
D. Conservative label retention
E. Downstream on demand.
Answer : B
Question 48 ( Topic 1 )
Which of the following commands is used to display the database containing the OSPF-TE
LSAs?
A. show router ospf opaque-database
B. show router ospf database
C. show router ospf opaque-Isa
D. show router ospf te opaque
Answer : A
Question 49 ( Topic 1 )
Which of the following statements regarding LSPs are true? (Choose two)
A. IGP-based LSPs are established solely from information contained in routing tables.
B. The constraint-based routed LSP is calculated at the ingress of the network, based on the router database and user defined constraints.
C. The constraint-based routed LSP is calculated at each hop of the LSP, based on the route table and user defined constraints.
D. IGP-based LSPs must use LDP signaling.
Answer : A,B
Question 50 ( Topic 1 )
Which of the following statements regarding LDP-over-RSVP are true? (Choose two)
A. Targeted sessions must exist between all routers in the tunnel's path.
B. Each LDP interface must be configured to support LDP tunneling.
C. LDP prefixes resolve to an RSVP LSP, rather than to a physical egress interface.
D. RSVP LSPs must exist between each PE-ABR pair, or ABR-ABR pair in each area.
Answer : C,D
Question 51 ( Topic 1 )
Click on the exhibit button below.
Given the configuration shown, how much of a link's 100Mbps reservable bandwidth can an LSP access when configured for class-type 0 and priority 1?
A. 10Mbps
B. 20Mbps
C. 30Mpbs
D. 60Mbps
E. 70Mbps
Answer : E
Question 52 ( Topic 1 )
Which of the following statements is true of an established LDP session?
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.
Answer : D
Question 53 ( Topic 1 )
Click on the exhibit button below.
Which fields in this output uniquely identify the RSVP session belonging to a single LSP?
(Choose three)
A. Tunnel ID
B. Name
C. LSP ID
D. To
Answer : A,B,C
Question 54 ( Topic 1 )
How many bits of the MPLS header are used for the label field?
A. 16
B. 20
C. 24
D. 25
E. 32
Answer : B
Question 55 ( Topic 1 )
Which of the following best describes constraint-based routing?
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.
Answer : B
Alcatel-Lucent Multi Protocol Label Switching Questions + Answers
-
answerhappygod
- Site Admin
- Posts: 899603
- Joined: Mon Aug 02, 2021 8:13 am