{"id":24576,"date":"2026-09-29T10:23:36","date_gmt":"2026-09-29T10:23:36","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=24576"},"modified":"2026-09-29T10:23:36","modified_gmt":"2026-09-29T10:23:36","slug":"cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-3-q41-60","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-3-q41-60\/","title":{"rendered":"Cisco CCNP Service Provider 300-510 Practice Test Questions and Exam Dumps Part 3 Q41-60"},"content":{"rendered":"<p><b>View Full <\/b><a href=\"https:\/\/www.examlabs.com\/300-510-exam-dumps\"><b>Cisco CCNP Service Provider 300-510 Exam Dumps<\/b><\/a><b> and Practice Test Dumps<\/b><\/p>\n<p>&nbsp;<\/p>\n<p><b>Question 41. An IS-IS Level-2 router is showing an overload bit in its LSP. What is the primary routing effect of this condition?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router becomes the preferred transit path for all Level-2 traffic<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router stops accepting Level-1 adjacencies<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Other routers avoid using the overloaded router as a transit path<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router automatically changes all interfaces to Level-1-only mode<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Other routers avoid using the overloaded router as a transit path<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The IS-IS overload bit indicates that a router should not be used as a transit router for traffic, typically while its routing information or resources are not fully ready. Other IS-IS routers can still use the router to reach destinations directly attached to it, but they avoid selecting it as an intermediate transit path. This mechanism is useful during startup, convergence, or resource-related conditions. It does not disable IS-IS adjacencies or automatically change interface levels. The overload bit therefore provides a controlled way to prevent traffic from being forwarded through a router whose transit routing capability should temporarily be avoided.<\/span><\/p>\n<p><b>Question 42. An OSPF router in an NSSA receives an external route from a connected autonomous system. Which LSA type is initially used to represent this external route inside the NSSA?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 7 LSA<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 3 LSA<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 4 LSA<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 5 LSA<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. Type 7 LSA<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">An OSPF Not-So-Stubby Area (NSSA) permits limited external route redistribution while preventing ordinary Type 5 LSAs from entering the area. External routes redistributed by an NSSA router are represented inside the NSSA using Type 7 LSAs. An NSSA ABR can subsequently translate eligible Type 7 LSAs into Type 5 LSAs when advertising those external routes into other OSPF areas. Type 3 LSAs are used for inter-area network summaries, while Type 4 LSAs describe reachability to an ASBR. Understanding Type 7 behavior is important when troubleshooting external route propagation through NSSA designs.<\/span><\/p>\n<p><b>Question 43. A service provider wants to reduce packet loss during an MPLS L3VPN link failure by rapidly rerouting traffic around a failed component. Which technology provides local protection using precomputed backup paths?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP Route Reflector<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LDP targeted discovery<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP Add-Path<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> TI-LFA<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. TI-LFA<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Topology Independent Loop-Free Alternate (TI-LFA) provides fast local protection in Segment Routing networks. It precomputes repair paths that can be installed before a failure occurs. When a protected link or node fails, traffic can be redirected locally without waiting for the complete IGP to reconverge. TI-LFA is particularly useful in service-provider networks where rapid convergence and reduced packet loss are important. BGP Route Reflectors influence BGP route distribution, LDP provides label distribution, and BGP Add-Path allows multiple paths to be advertised. None of those mechanisms provides the same local fast-reroute function as TI-LFA.<\/span><\/p>\n<p><b>Question 44. A BGP route received from an external peer has an unreachable NEXT_HOP attribute. What must generally be resolved before the route can be installed as a usable forwarding path?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> The BGP community must be removed<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IP reachability to the NEXT_HOP must be established<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The AS_PATH must be replaced with the local AS<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The route must be converted to an OSPF Type 5 LSA<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. IP reachability to the NEXT_HOP must be established<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">BGP can receive a route successfully at the control-plane level while still being unable to use it for forwarding if the advertised NEXT_HOP address is unreachable. The router must have an appropriate route to the BGP next-hop address through an IGP, static route, or another valid routing mechanism. Once next-hop reachability exists, the BGP route can become eligible for installation and forwarding. Changing the AS_PATH or BGP community does not inherently solve next-hop reachability. Converting the route into an OSPF LSA is also unrelated to the fundamental issue.<\/span><\/p>\n<p><b>Question 45. Which BGP feature allows a router to advertise multiple paths for the same prefix instead of selecting and advertising only one best path?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route dampening<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Local Preference<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Add-Path<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MED<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Add-Path<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">BGP Add-Path allows a BGP speaker to advertise multiple distinct paths for the same prefix. Traditional BGP behavior generally selects one best path for advertisement to a particular peer, which can hide useful alternate paths. Add-Path can improve path diversity and reduce problems associated with limited path visibility, particularly in complex service-provider topologies. Local Preference influences outbound path selection, MED can influence path selection between neighboring autonomous systems, and route dampening is designed to suppress unstable routes. Add-Path therefore directly addresses the requirement to advertise multiple paths for a prefix.<\/span><\/p>\n<p><b>Question 46. A provider uses BGP Route Reflectors to reduce the number of iBGP sessions. Which route-reflector attribute helps prevent a reflected route from looping between route reflectors?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> CLUSTER_LIST<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LOCAL_PREF<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MED<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> NEXT_HOP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. CLUSTER_LIST<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The BGP CLUSTER_LIST attribute is used by route reflectors to help prevent routing loops. When a route reflector reflects a route, it adds its cluster ID to the CLUSTER_LIST. If a route reflector receives a route containing its own cluster ID, it can reject that route because it indicates that the route has already passed through that reflector cluster. The ORIGINATOR_ID attribute also helps prevent reflection loops by identifying the original BGP speaker, but CLUSTER_LIST specifically provides protection against loops involving route-reflector clusters. LOCAL_PREF, MED, and NEXT_HOP serve different purposes in BGP operation.<\/span><\/p>\n<p><b>Question 47. An administrator wants to influence inbound traffic toward a provider network by making its advertised routes appear less attractive through AS-path manipulation. Which technique should be used?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Increasing Local Preference<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> AS_PATH prepending<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Increasing the BGP Weight<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Changing the Route Target<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. AS_PATH prepending<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">AS_PATH prepending adds one or more copies of the provider&#8217;s own autonomous system number to the AS_PATH of an advertised route. Other autonomous systems can then see a longer AS_PATH and may consider alternative paths more attractive, depending on their complete BGP best-path process. This technique is commonly used to influence inbound traffic engineering. Local Preference and Weight primarily influence path selection within the local autonomous system, while Route Targets control VPN route import and export. AS_PATH prepending should therefore be applied carefully because its effect depends on the policies and attributes used by neighboring networks.<\/span><\/p>\n<p><b>Question 48. A network engineer needs to identify the MPLS label information that a router actually uses to forward packets after a route has been selected. Which table should be examined?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> RIB<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> ARP table<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP table<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LFIB<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. LFIB<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The Label Forwarding Information Base (LFIB) contains the label forwarding information used by an MPLS-enabled router to make forwarding decisions for labeled packets. It includes information such as incoming labels, outgoing labels, and forwarding actions such as swap, push, or pop. The RIB contains IP routing information, while the BGP table contains BGP control-plane routes and attributes. The ARP table maps IP addresses to Layer 2 addresses and is not the primary source of MPLS label forwarding decisions. Therefore, LFIB is the appropriate table when troubleshooting actual MPLS label forwarding behavior.<\/span><\/p>\n<p><b>Question 49. In an MPLS L3VPN network, which BGP attribute uniquely distinguishes overlapping customer IPv4 prefixes when they are carried as VPNv4 routes?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Distinguisher<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Target<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Local Preference<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MED<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. Route Distinguisher<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The Route Distinguisher (RD) makes otherwise identical IPv4 prefixes globally unique within the VPNv4 address family. For example, multiple customers can use the same private prefix, such as 10.10.10.0\/24, while different RDs create unique VPNv4 routes. The RD provides route uniqueness but does not determine which VRFs import the route. That function is primarily associated with Route Targets. Local Preference and MED are BGP path-selection attributes and do not provide VPN prefix uniqueness. Therefore, the RD is the key mechanism for distinguishing overlapping customer address spaces.<\/span><\/p>\n<p><b>Question 50. Which OSPF LSA type is generated by an ASBR to describe an external destination redistributed into the OSPF domain?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 1<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 3<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 5<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Type 4<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Type 5<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">An OSPF Autonomous System Boundary Router (ASBR) uses Type 5 LSAs to advertise external routes redistributed into the OSPF autonomous system. Type 5 LSAs are flooded throughout normal OSPF areas, except where area-specific restrictions such as stub-area behavior apply. Type 1 LSAs describe router links, Type 3 LSAs are generated by ABRs to advertise inter-area networks, and Type 4 LSAs provide reachability information for an ASBR. In an NSSA, external routes are initially represented with Type 7 LSAs and may later be translated into Type 5 LSAs by an appropriate ABR.<\/span><\/p>\n<p><b>Question 51. A provider wants to advertise an IPv6 unicast route across an IPv4 MPLS core using MP-BGP without requiring IPv6 transport connectivity across every core router. Which technology is designed for this purpose?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> 6PE<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PIM-SM<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> RSVP-TE<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LDP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. 6PE<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">IPv6 Provider Edge (6PE) enables IPv6 connectivity across an MPLS provider core that may run only IPv4 at the transport level. IPv6 routes are carried using MP-BGP, while MPLS labels allow the IPv6 packets to traverse the IPv4 MPLS core. This avoids requiring native IPv6 routing throughout every core device. PIM-SM is a multicast routing protocol, RSVP-TE provides traffic-engineered tunnels, and LDP distributes MPLS labels. 6PE is therefore the technology associated with transporting IPv6 provider-edge traffic across an IPv4 MPLS backbone.<\/span><\/p>\n<p><b>Question 52. In an OSPF broadcast network, two routers form a 2-Way relationship but do not establish full adjacency with each other. What is the most likely explanation?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Their router IDs are identical<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> They are both non-DR\/BDR routers<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF authentication is necessarily disabled<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Their interfaces are configured as point-to-point<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. They are both non-DR\/BDR routers<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">On an OSPF broadcast network, routers form full adjacencies with the Designated Router (DR) and Backup Designated Router (BDR). Other routers can remain in the 2-Way state with one another because they do not need full database synchronization with every other router on the segment. This design reduces the number of adjacencies and limits unnecessary LSA exchange. A duplicate router ID can prevent proper adjacency formation, but it is not the normal reason for a stable 2-Way state between two DROTHER routers. Point-to-point interfaces use different adjacency behavior and do not elect a DR or BDR.<\/span><\/p>\n<p><b>Question 53. Which BGP community is intended to prevent a route from being advertised to any BGP peer?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> NO_ADVERTISE<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> NO_EXPORT<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> INTERNET<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LOCAL-AS<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. NO_ADVERTISE<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The NO_ADVERTISE well-known BGP community instructs a BGP speaker not to advertise the associated route to any BGP peer. It can therefore be used to control route propagation when a route should remain local to the receiving BGP speaker. NO_EXPORT has a different purpose: it prevents a route from being advertised outside the local autonomous system or confederation boundaries according to the applicable BGP semantics. INTERNET is generally used to indicate that a route may be advertised normally, while LOCAL-AS is associated with local autonomous-system handling. Correct community selection is important for precise route-policy control.<\/span><\/p>\n<p><b>Question 54. An MPLS router receives a packet with label 200 and forwards it with label 350. What MPLS operation has occurred?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Pop<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Push<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Swap<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PHP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Swap<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">An MPLS label swap occurs when a router receives a labeled packet and replaces the incoming label with another outgoing label before forwarding it. In this example, label 200 is replaced with label 350, which is a classic swap operation. A push operation adds a new label to the label stack, while pop removes a label. Penultimate Hop Popping (PHP) is a specific case in which the penultimate router removes the outer transport label before forwarding toward the egress router. Therefore, replacing one label with another is correctly identified as label swapping.<\/span><\/p>\n<p><b>Question 55. Which BGP attribute is normally used to influence outbound traffic selection within a single autonomous system and is propagated through iBGP?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> MED<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LOCAL_PREF<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> AS_PATH<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> ORIGINATOR_ID<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. LOCAL_PREF<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">LOCAL_PREF is a BGP attribute used within an autonomous system to influence which exit path routers prefer for outbound traffic. A higher LOCAL_PREF value is normally preferred. It is propagated through iBGP so that routers within the autonomous system can apply a consistent outbound-path policy. MED is primarily used to provide a neighboring AS with information about preferred entry points, while AS_PATH length is another best-path factor. ORIGINATOR_ID is used in route-reflection environments. LOCAL_PREF is therefore the standard attribute for influencing outbound path selection across an autonomous system.<\/span><\/p>\n<p><b>Question 56. A service provider wants to establish a traffic-engineered MPLS tunnel with an explicitly defined path through specific links. Which technology is most directly associated with this requirement?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> LDP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BFD<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PIM<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> RSVP-TE<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. RSVP-TE<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">RSVP-TE is designed to establish MPLS traffic-engineered tunnels with explicit or constrained paths. Network operators can specify path requirements and reserve resources where supported, allowing traffic to follow a path different from the shortest IGP path. LDP primarily distributes labels based on existing routing information and does not provide the same explicit traffic-engineering functionality. BFD provides rapid failure detection, while PIM is used for IP multicast routing. RSVP-TE therefore directly matches the requirement for an explicitly engineered MPLS tunnel path.<\/span><\/p>\n<p><b>Question 57. In a PIM-SM network, a receiver has joined a multicast group but traffic is not arriving. The router has no valid unicast route to the multicast source. Which condition should be investigated first?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP MED<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF DR election<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> RPF reachability to the source<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS Route Target<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. RPF reachability to the source<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">PIM-SM relies on Reverse Path Forwarding (RPF) checks to determine whether multicast traffic is arriving on the correct interface toward the source or relevant upstream path. If the router lacks a valid unicast route to the multicast source, the RPF check can fail and multicast traffic may be discarded. Troubleshooting should therefore include verification of the unicast routing table, the expected RPF interface, and source reachability. BGP MED, OSPF DR election, and MPLS Route Targets do not directly resolve a multicast source RPF failure. Correct unicast routing is fundamental to reliable PIM forwarding.<\/span><\/p>\n<p><b>Question 58. Which mechanism allows an MPLS router to remove the outer transport label before the packet reaches the egress router?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Penultimate Hop Popping<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Target filtering<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP Add-Path<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LDP targeted discovery<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. Penultimate Hop Popping<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Penultimate Hop Popping (PHP) allows the router immediately before the MPLS egress router to remove the outer transport label. This reduces the label-processing work required at the egress router and is commonly used with MPLS label distribution mechanisms such as LDP. Instead of receiving the outer transport label and removing it itself, the egress router can receive an already unlabeled IP packet or an appropriate remaining label stack. Route Target filtering controls VPN route distribution, BGP Add-Path controls multiple path advertisement, and targeted LDP extends label discovery. PHP specifically describes the penultimate router&#8217;s label-removal operation.<\/span><\/p>\n<p><b>Question 59. A BGP session is stuck in the Active state. Which underlying issue should be investigated as a likely cause?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router has received too many OSPF Type 3 LSAs<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The MPLS LFIB contains a PHP entry<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The BGP community is set to NO_EXPORT<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> TCP connectivity to the BGP peer is failing<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. TCP connectivity to the BGP peer is failing<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The BGP Active state commonly indicates that the router is attempting to establish the TCP connection required for the BGP session but is not successfully completing the connection process. Troubleshooting should therefore include IP reachability, TCP port 179 connectivity, access-control policies, source-interface configuration, TTL requirements, and peer addressing. A route&#8217;s BGP community does not determine whether the TCP session can form. Similarly, OSPF LSA volume and MPLS PHP are unrelated to establishing the underlying BGP transport session. Verifying basic IP and TCP connectivity is therefore an important first step.<\/span><\/p>\n<p><b>Question 60. In an MPLS L3VPN deployment, which attribute determines whether a VPN route learned by a PE router is imported into a particular VRF?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Distinguisher<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Target<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> AS_PATH<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP Weight<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. Route Target<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Route Targets (RTs) control the import and export policy for MPLS L3VPN routes. When a PE router receives a VPNv4 or VPNv6 route, it examines the extended communities containing Route Targets and compares them with the import RT configuration of local VRFs. If a matching import RT is configured, the route can be imported into that VRF. The Route Distinguisher serves a different purpose: it makes overlapping prefixes unique in the VPN address family. AS_PATH and Weight are BGP path attributes and do not determine VRF route import membership. Thus, Route Target is the relevant attribute.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>View Full Cisco CCNP Service Provider 300-510 Exam Dumps and Practice Test Dumps &nbsp; Question 41. An IS-IS Level-2 router is showing an overload bit in its LSP. What is the primary routing effect of this condition? The router becomes the preferred transit path for all Level-2 traffic The router stops accepting Level-1 adjacencies Other [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1648,1647],"tags":[],"_links":{"self":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24576"}],"collection":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/comments?post=24576"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24576\/revisions"}],"predecessor-version":[{"id":24577,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24576\/revisions\/24577"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=24576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=24576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=24576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}