Nokia Nokia 4A0-103 PDF Nokia Nokia 4A0-103 PDF Questions Available Here at: https://www.certification-exam.com/en/dumps/nokia-exam/4a0-103-dumps/quiz.html Enrolling now you will get access to 222 questions in a unique set of Nokia 4A0-103 Question 1 You wish to advertise LDP labels for all local networks; which is the most effective policy statement to use? Options: A. from prefix-list direct B. match local C. from protocol direct D. match protocol direct E. from protocol local Answer: C Explanation: The correct answer is C. from protocol direct In LDP, if you want to advertise labels for all networks that are directly connected to the router, the policy must match routes that are learned from the direct protocol, meaning directly connected interfaces and local subnets. Why C is correct: - from protocol direct refers to routes that come from directly connected networks. - These are the local networks on the router. - Using this policy statement allows LDP to advertise labels for all such directly attached prefixes. Why the other options are not correct: - A. from prefix-list direct - This is not the standard way to match all locally connected routes for LDP advertisement. - A prefix list could be used to match specific prefixes, but not as effectively as matching the protocol directly. - B. match local - This is too vague and is not the correct policy statement syntax for selecting directly connected routes in Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ this context. - D. match protocol direct - This is close in meaning, but the question asks for the most effective policy statement to use. - In policy terms, the correct action is usually expressed as from protocol direct, not match protocol direct. - E. from protocol local - "local" does not describe directly connected routes in the same way as "direct". - LDP label advertisement for local networks is tied to direct routes, not local protocol routes. Key idea: - "Direct" means connected to the router through an interface. - To advertise LDP labels for all local networks, you want to match directly connected routes. - Therefore, from protocol direct is the best answer. If you want, I can also explain how this works in Junos policy terminology and how it differs from prefix-list filtering. Question 2 Which of the following indicates the path over which an LSP's tail end router will return an RSVP RESV message? Options: A. The IGP FIB. B. The Reservation State Block (RSB) C. The Path State Block (PSB) D. The opaque database. Answer: C Explanation: The correct answer is C. The Path State Block (PSB). In RSVP, the Path State Block stores information about the PATH message that was received as it traveled downstream toward the LSP tail end router. This state includes details such as the sender, session, and the previous hop information. When the tail end router sends a RESV message back toward the head end, it uses the information in the PSB to determine the reverse path along which the reservation message should be sent. In other words, the PSB tells the router where the PATH message came from, so the RESV message can follow that recorded path back upstream. Why the other options are incorrect: A. The IGP FIB The IGP FIB is used for normal IP forwarding decisions based on routing information, but it is not the RSVP-specific state used to return RESV messages. B. The Reservation State Block (RSB) The RSB stores reservation information associated with received RESV messages, not the path used to Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ send them back. D. The opaque database This is not the RSVP state used to track the return path for RESV messages. So, the PSB is the correct RSVP structure because it records the path state needed for the RESV message to travel back through the LSP. Question 3 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? Options: A. Router R1 B. Router R2 C. Router R3 D. Router R4 E. Router R5 Answer: B Explanation: The correct answer is B. Router R2. In MPLS Traffic Engineering with fast reroute, the PLR is the Point of Local Repair. This is the router that detects the failure and immediately switches traffic to a backup path. The MP is the Merge Point, which is the router where the backup path rejoins the primary LSP path. Given: - The protected LSP path is R1-R2-R3 - Fast reroute is enabled - Both LSPs use facility bypass and link protection - R1 is the PLR Since the failure being protected is a link failure on the path starting at R1, the repair path must bypass the failed link and merge back into the original LSP as early as possible. In this topology, R2 is the first downstream router on the LSP and is the point where the bypassed traffic can rejoin the protected path. So: - R1 = PLR - R2 = MP Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ Why not the others: - R1 cannot be the MP because it is the repair origin, not the merge point - R3 is farther downstream than needed - R4 and R5 are not on the primary LSP path described as the merge point for this protection scenario Therefore, the merge point is Router R2. Question 4 Click on the exhibit button below. Given the output below, which of the following statements are true? (Choose three) Options: 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 Explanation: The correct answers are A, B, and D. Here is why each statement is true or false based on the exhibited MPLS/LDP forwarding information: 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. True. The exhibit shows a label swap operation for that FEC. In MPLS forwarding, an incoming label is matched against the LFIB entry, and the router swaps it to the outgoing label while forwarding it to the listed outgoing interface. Since the output indicates that label 131066 is associated with forwarding toward 10.10.10.243/32 via interface 1/1/4 and the new label is 131070, this statement is correct. B. LDP ECMP is enabled. True. The exhibit shows multiple equal-cost label paths being installed for the same FEC. When LDP ECMP is enabled, the router can use multiple next hops and multiple label bindings for the same destination prefix. The presence of multiple forwarding entries to the same FEC indicates ECMP behavior. C. The router’s system address is 10.10.10.242/32. False. A router’s LDP system address is typically the loopback or router ID used as the transport address for LDP Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ sessions. The exhibit does not support that the system address is 10.10.10.242/32; instead, 10.10.10.242/32 appears to be one of the FECs/prefixes in the table, not necessarily the system address of the router itself. D. There are multiple LSPs to reach FEC 10.10.10.244/32. True. The exhibit shows more than one label path toward the FEC 10.10.10.244/32. Multiple label-switched paths to the same FEC mean the router has installed multiple LSPs, usually because of ECMP or multiple next- hop resolution. E. The router cannot receive any unlabeled packets destined for prefix 10.10.10.223/32. False. This is too strong a statement. Even in an MPLS-enabled network, a router can still receive unlabeled IP packets for a destination prefix, depending on how traffic enters the network or whether the packet arrives from a non-MPLS neighbor or locally attached source. The exhibit does not prove that unlabeled packets cannot be received for that prefix. Summary: A is true because the label swap and outgoing interface match the forwarding entry. B is true because multiple equal-cost label paths are shown. D is true because there are multiple LSPs for the same FEC. Therefore, the correct answer is A, B, and D. Question 5 Which of the following statements best describe MPLS fast reroute characteristics? (Choose two) Options: 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 Explanation: The correct answers are B and C. MPLS fast reroute (FRR) is designed to provide very fast traffic recovery when a link or node fails in an MPLS network. Its main purpose is to reduce traffic loss and downtime by switching traffic to a precomputed backup path almost immediately. Why B is correct: Fast reroute provides path protection close to the failure point. This is one of the key ideas behind MPLS FRR. Protection is typically established near the point of failure so that traffic can be redirected locally without waiting for the full IGP or RSVP-TE reconvergence process. This allows recovery in tens of milliseconds in many cases. Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ Why C is correct: Fast reroute performs automatic path calculation and signaling. FRR backup paths are computed and established automatically by the protocol or control plane, rather than being manually set up for each failure event. The network prepares a backup path in advance, and when a failure occurs, traffic is automatically switched to that path. Why A is incorrect: Fast reroute requires you to manually define detour paths. This is not generally true. MPLS FRR is intended to automate protection path creation. While an operator may configure protection policies, the backup path itself is not usually manually built for every failure scenario. Why D is incorrect: Fast reroute protects both primary and secondary paths. FRR protects the primary path by providing a backup for it. It does not typically mean that both the primary and secondary paths are protected in the same sense. The focus is on protecting traffic that is currently using the primary LSP. In short, MPLS FRR is characterized by local, rapid, preplanned backup path protection, which makes B and C the best choices. Question 6 During node protection signaling, the PLR knows the address of the MP from which of the following methods? Options: 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 Explanation: The correct answer is C. The PLR learns the address of the MP from the RRO. In node protection signaling, the Point of Local Repair (PLR) is the router that detects a failure and tries to restore traffic by switching it onto a preplanned backup path. To do this effectively, the PLR must know the address of the Merge Point (MP), which is the downstream router where the backup path rejoins the primary path. The key detail is that this information is obtained from the RSVP Path State. Specifically, the Record Route Object (RRO) carries the path information accumulated as the RSVP Path message travels through the Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ network. The PLR uses the RRO to determine the topology and identify the appropriate merge point for node-protection signaling. Why the other options are incorrect: A. The PLR issues a RSVP path message to the destination router to request the address of the MP. This is not how the MP address is learned. RSVP Path messages are used to establish the LSP and carry signaling state, but the PLR does not send a special Path message just to request the MP address. B. The PLR learns the address of the MP from the ERO. The Explicit Route Object (ERO) specifies the intended route for the traffic, but it is not the source of the MP address for node protection signaling. D. The PLR learns the address of the MP from the targeted RSVP hello message. Targeted RSVP Hello messages are used for neighbor discovery and liveliness detection, not for identifying the merge point in node protection signaling. E. The PLR does not need to know the address of the MP. This is incorrect because the PLR does need the MP address to properly signal and establish node protection backup behavior. In summary, the RRO is the mechanism that provides the PLR with the information needed to identify the merge point, making C the correct choice. Question 7 What is the significance of receiving a packet with the bottom MPLS label S bit set to 1? Options: 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 Explanation: The correct answer is B. It indicates that the label is the bottom of the MPLS label stack. In MPLS, each label entry includes an S bit, which stands for "Bottom of Stack." This bit tells a Label Switch Router (LSR) whether the current label is the last MPLS label in the stack. If the S bit is set to 1: - That label is the bottom-most label in the MPLS label stack. - It means there are no more MPLS labels beneath it. - The router will then typically use the payload following the MPLS labels for further processing, such as IP forwarding, once the label stack is removed. Why the other options are incorrect: - A. It results in forwarding based on the next packet header. This is not specifically what the S bit means. While the packet after the bottom label may be examined after Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ label popping, the S bit itself indicates stack position, not forwarding behavior. - C. It indicates that the label is the top of the MPLS label stack. The top of the stack is the outermost label, not the one with S bit set to 1. - D. Any LSR that receives an S bit set to 1 must discard the packet. This is false. Receiving an S bit set to 1 is normal and expected in MPLS; it does not require discarding the packet. So, the S bit set to 1 identifies the bottom of the MPLS label stack, making B the correct answer. Question 8 Which command can be used to verify the LDP settings for label distribution and retention? Options: 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 Explanation: The correct answer is B. show router ldp parameters LDP stands for Label Distribution Protocol, which is used in MPLS networks to distribute labels between routers. When you want to verify how LDP is configured, especially settings related to label distribution and retention, you need a command that displays the protocol’s operational parameters. Why B is correct: show router ldp parameters is the command used to view LDP configuration and parameter details. This typically includes items such as: - label distribution mode - retention mode - advertisement behavior - related protocol settings Since the question specifically asks about verifying LDP settings for label distribution and retention, this command is the most appropriate. Why the other options are not correct: A. show router ldp default This would suggest default values or template settings, not the active parameter verification needed here. C. show router ldp settings This looks plausible, but it is not the standard command for verifying detailed LDP parameter settings in this context. Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ D. show router mpls settings This is broader MPLS information, not specifically LDP parameters. E. show router mpls label-options This relates to MPLS label behavior, but not directly to LDP label distribution and retention settings. Conclusion: If you need to check LDP-related parameters such as label distribution and retention, use: show router ldp parameters So the correct choice is B. Question 9 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? Options: 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 Explanation: The correct answer is D. The egress RSVP interface has 1 Gbps bandwidth unreserved. RSVP-TE allows an LSP to reserve bandwidth along its path, but the amount of bandwidth that can actually be reserved on an interface depends on the interface’s reservable bandwidth limit. Here, the physical link is 10 Gbps, but the RSVP configuration limits reservable bandwidth to 20 percent of the interface bandwidth. So: 10 Gbps x 20% = 2 Gbps reservable bandwidth Router R3 signals an LSP that reserves 1 Gbps on that link. That means: 2 Gbps total reservable minus 1 Gbps already reserved equals 1 Gbps still unreserved So the remaining unreserved bandwidth for RSVP reservations on that egress interface is 1 Gbps. Why the other options are wrong: A. The egress RSVP interface has 80 percent bandwidth unreserved. This is incorrect because the 20 percent limit applies to reservable bandwidth, not to the whole 10 Gbps link in the way stated here. The unreserved portion within the RSVP reservable pool is not 80 percent of the physical link. Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ B. LSPs can reserve an additional 9.9 Gbps bandwidth on this RSVP interface. This is impossible because the RSVP reservable bandwidth is capped at 2 Gbps, not 10 Gbps. C. The head end reserves 100 Mbps for the LSP This is incorrect because the question explicitly says the LSP reserves 1 Gbps. Key takeaway: RSVP bandwidth reservation is based on the configured reservable bandwidth, not necessarily the full interface capacity. Here, 20 percent of 10 Gbps is 2 Gbps, and after reserving 1 Gbps, 1 Gbps remains unreserved. If you want, I can also show this in a simple step-by-step table. Question 10 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? Options: A. Router R1 B. Router R2 C. Router R3 D. Router R4 E. Router R5 Answer: E Explanation: The correct answer is E. Router R5. In MPLS Traffic Engineering Fast Reroute, a Detour Tunnel is used to protect traffic when the primary path fails. The router that becomes the DMP, or Detour Merge Point, is the point where the detour tunnel rejoins the original LSP. For the default fast reroute configuration, the detour tunnel is typically created downstream of the Point of Local Repair (PLR) and merges back onto the protected LSP at the next appropriate downstream router that is able to rejoin the path. In the exhibit, for LSP R1-R2-R3, the router selected as the merge point is R5. Why not the others: - R1 is the ingress router, so it does not serve as the detour merge point. - R2 is the PLR in this protected segment, meaning it is the router that detects the failure and initiates the detour. - R3 is the egress router for the LSP, but the detour merge point is not necessarily the final egress. Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/ - R4 is on the path, but in this topology it is not the router where the detour tunnels merge. - R5 is the router where the detour tunnels converge back toward the protected LSP, so it is the DMP. So, under the default FRR setup for the LSP R1-R2-R3, R5 is the DMP. Would you like to see more? Don't miss our Nokia 4A0- 103 PDF file at: https://www.certification-exam.com/en/pdf/nokia-pdf/4a0-103-pdf/ Nokia Nokia 4A0-103 PDF https://www.certification-exam.com/