{"id":24596,"date":"2026-09-29T10:38:00","date_gmt":"2026-09-29T10:38:00","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=24596"},"modified":"2026-09-29T10:38:00","modified_gmt":"2026-09-29T10:38:00","slug":"cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-13-q241-260","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-13-q241-260\/","title":{"rendered":"Cisco CCNP Service Provider 300-510 Practice Test Questions and Exam Dumps Part 13 Q241-260"},"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 241. An IS-IS Level-1 router needs to reach a destination located outside its local area. Which route is commonly used to provide connectivity toward the rest of the IS-IS domain?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> A Level-1 route learned from an unrelated area<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> A default route toward a Level-1-2 router<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> A BGP route reflector route<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> An OSPF Type 5 route<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. A default route toward a Level-1-2 router<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">IS-IS Level-1 routers maintain knowledge primarily about destinations within their local area. When a destination is outside that area, the Level-1 router commonly uses a default route toward a Level-1-2 router. The Level-1-2 router provides connectivity toward the Level-2 backbone and other areas. This hierarchical behavior allows Level-1 routers to maintain a smaller topology database while still reaching remote destinations. The default route therefore provides a practical way for an L1 router to forward traffic toward destinations it does not know specifically, rather than requiring the router to maintain complete inter-area topology information.<\/span><\/p>\n<p><b>Question 242. An OSPF administrator wants to prevent selected inter-area routes from being advertised into a particular area while still allowing other routes to be exchanged normally. Which feature can provide route filtering at an appropriate OSPF area boundary?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP Add-Path<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS PHP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IS-IS PSNP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF area filtering mechanisms such as an area filter-list<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. OSPF area filtering mechanisms such as an area filter-list<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">OSPF supports area-boundary filtering mechanisms that can control which inter-area prefixes are advertised between an area and the rest of the OSPF domain. An area filter-list can be applied at an ABR to selectively filter Type 3 summary LSAs according to the configured policy. This provides more granular control than simply making an area stub or NSSA. BGP Add-Path is a BGP path-advertisement feature, MPLS PHP concerns label operations, and PSNP is an IS-IS database-synchronization mechanism. Proper OSPF filtering should be planned carefully because filtering inter-area information can affect reachability.<\/span><\/p>\n<p><b>Question 243. A service-provider router receives multiple BGP routes and needs to prefer one route because it has the highest LOCAL_PREF value. Which BGP decision-process characteristic explains this behavior?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Higher LOCAL_PREF is preferred before AS_PATH length<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Shorter MED is always preferred first<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> eBGP paths are always preferred before LOCAL_PREF<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Router ID is evaluated before LOCAL_PREF<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. Higher LOCAL_PREF is preferred before AS_PATH length<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">LOCAL_PREF is an important BGP path-selection attribute used within an autonomous system. A higher LOCAL_PREF is preferred when comparing eligible paths, and it is evaluated before AS_PATH length in the standard Cisco BGP decision process. This makes LOCAL_PREF particularly useful for controlling outbound traffic through preferred provider exits. AS_PATH length is considered later, so a path with a shorter AS_PATH does not automatically win when another eligible path has a higher LOCAL_PREF. Router ID is a later tie-breaker, while MED is also considered after several higher-priority attributes.<\/span><\/p>\n<p><b>Question 244. A provider has two links to the same neighboring autonomous system and wants the neighbor to prefer one link for inbound traffic. The provider does not control the neighbor&#8217;s LOCAL_PREF. Which technique can make the less-preferred advertisement appear less attractive based on AS_PATH length?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Increasing BFD timers<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Raising the local OSPF cost<\/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;\"> Changing the MPLS VPN label<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. AS_PATH prepending<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">AS_PATH prepending allows a network to influence how external autonomous systems evaluate its advertised routes. By adding additional copies of its own AS number to one advertisement, the provider can make that path appear to have a longer AS_PATH. When the neighboring network evaluates the paths and reaches AS_PATH length in its decision process, the longer path may be less preferred. This technique is commonly used for inbound traffic engineering because the provider cannot directly configure the neighbor&#8217;s internal LOCAL_PREF. It does not alter the physical topology or MPLS forwarding labels.<\/span><\/p>\n<p><b>Question 245. An MPLS L3VPN route is present in the MP-BGP VPNv4 table, but it does not appear in the customer&#8217;s VRF on the remote PE. The Route Target exported by the originating VRF is different from the remote VRF&#8217;s import Route Target. What is the likely cause?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Incorrect OSPF router priority<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Missing PIM Join<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Incorrect LDP TCP port<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Target import-policy mismatch<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. Route Target import-policy mismatch<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Route Targets determine which VPN routes are imported into a VRF. A VPNv4 route can be successfully exchanged through MP-BGP and still remain absent from the destination VRF when its attached export Route Target does not match the VRF&#8217;s configured import Route Target policy. The Route Distinguisher is responsible for making overlapping VPN prefixes unique and does not determine VRF membership. Engineers troubleshooting this problem should compare the route&#8217;s extended communities with the receiving VRF&#8217;s import configuration. A mismatch is a common reason for VPN routes being visible in BGP but missing from the customer routing table.<\/span><\/p>\n<p><b>Question 246. An IS-IS router receives a CSNP from the DIS and discovers that its database is missing one of the LSPs listed in the CSNP. What should the router use to request the missing LSP?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP UPDATE<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PSNP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF LSAck<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PIM Register<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. PSNP<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A Complete Sequence Number PDU, or CSNP, provides a summary of the LSP database available from the sending IS-IS router. When a receiving router determines that an LSP is missing or that its local version is outdated, it can use a Partial Sequence Number PDU, or PSNP, to request the required LSP information. This CSNP\/PSNP interaction helps keep IS-IS link-state databases synchronized. OSPF LSA acknowledgments, BGP UPDATE messages, and PIM Register messages belong to different protocols and do not perform IS-IS LSP synchronization.<\/span><\/p>\n<p><b>Question 247. A BGP route reflector receives a route from a non-client iBGP peer. Under normal route-reflector rules, to which type of peer can the route be reflected?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Only the same non-client peer<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Only external BGP peers<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Its configured route-reflector clients<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> No peer because route reflection disables iBGP propagation<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Its configured route-reflector clients<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Route-reflector advertisement rules depend on whether the route was learned from a client or non-client peer. A route learned from a non-client iBGP peer can be advertised to route-reflector clients. This allows the route reflector to distribute routes learned from non-client portions of the iBGP topology to its clients. The rules help maintain loop prevention while avoiding the requirement for a complete iBGP mesh. Route reflection does not disable iBGP propagation, nor does it restrict reflected routes exclusively to external BGP peers.<\/span><\/p>\n<p><b>Question 248. A service provider needs to carry IPv6 customer routes through an MPLS core where the provider core routers primarily use IPv4. Which technology provides IPv6 connectivity across the MPLS IPv4 core without requiring every core router to become an IPv6 routing node?<\/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;\"> NAT64<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PIM-SM<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IPv4 BGP only<\/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;\">6PE allows service providers to transport IPv6 traffic across an MPLS core that can continue to operate with IPv4 as its core routing protocol. Provider-edge routers use MP-BGP to exchange IPv6 reachability, while MPLS provides transport across the provider network. This design avoids requiring IPv6 routing throughout every core device. NAT64 performs address-family translation rather than providing the same MPLS IPv6 transport architecture. PIM-SM is a multicast protocol, and ordinary IPv4 BGP does not provide the required IPv6 VPN or 6PE functionality.<\/span><\/p>\n<p><b>Question 249. An MPLS router has learned label bindings through LDP, but an engineer wants to determine which label operation will actually be applied to incoming labeled packets. Which table should be examined?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP Loc-RIB<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LFIB<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> ARP table<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IGMP database<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. LFIB<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The Label Forwarding Information Base, or LFIB, contains the information used for MPLS forwarding operations. It identifies how an incoming label should be processed, including operations such as swap, pop, or push and the associated outgoing interface or next hop. The LDP LIB contains learned label bindings, but those bindings are used to build forwarding information that is installed in the LFIB. The BGP Loc-RIB contains selected BGP routes, while ARP and IGMP support different networking functions. Therefore, the LFIB is the key table to inspect when analyzing actual MPLS label forwarding.<\/span><\/p>\n<p><b>Question 250. A network engineer wants to use a single MPLS label to represent a service-specific VPN route so that the egress PE can identify the customer&#8217;s forwarding context. Which label is primarily associated with this function?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Ethernet VLAN tag<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Transport label only<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IGP metric<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> VPN label<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. VPN label<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">In MPLS L3VPN operation, the VPN label identifies the VPN forwarding context at the egress provider-edge router. The transport label carries the packet across the MPLS core toward the appropriate egress PE, while the VPN label provides service-specific information that helps the egress PE select the correct VRF or VPN forwarding path. MP-BGP distributes the VPN route and associated label information between PEs. An IGP metric is used for IP path calculation, and an Ethernet VLAN tag belongs to a different Layer 2 mechanism. Separating transport and VPN labels is fundamental to MPLS L3VPN forwarding.<\/span><\/p>\n<p><b>Question 251. A BGP administrator wants to accept a maximum of 50,000 prefixes from a customer and take protective action if that number is exceeded. Which feature directly provides this control?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP maximum-prefix<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP MED<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP route reflector<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP community<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. BGP maximum-prefix<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The BGP maximum-prefix feature establishes a limit on the number of prefixes accepted from a particular BGP neighbor. It is commonly used at customer and provider boundaries to protect the router from unexpected route-table growth caused by configuration mistakes or route leaks. The administrator can define the threshold and configure the desired action when the limit is reached. MED influences route selection, route reflection affects iBGP scalability, and communities carry policy information. None of those mechanisms directly limits the number of prefixes received from a BGP neighbor.<\/span><\/p>\n<p><b>Question 252. A PIM-SM router receives a multicast packet from a source on an interface that is not the interface selected by the unicast routing table as the best path back to that source. What action will normally occur?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router creates an OSPF Type 5 LSA<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router changes the source&#8217;s BGP AS_PATH<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router drops the packet because of an RPF failure<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The router automatically creates an MPLS VPN<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. The router drops the packet because of an RPF failure<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">PIM multicast forwarding uses the unicast routing table to determine the Reverse Path Forwarding interface toward the multicast source. If a multicast packet arrives on an interface other than the expected RPF interface, the router normally treats the packet as failing the RPF check and drops it. This protects the multicast topology from forwarding loops and duplicate traffic. Troubleshooting an RPF failure requires checking the unicast route toward the source and comparing its selected outgoing interface with the interface on which the multicast packet arrives.<\/span><\/p>\n<p><b>Question 253. A service provider is troubleshooting a Segment Routing policy. The policy has multiple candidate paths, and the administrator wants one candidate path to be selected based on a higher configured preference when the candidates are otherwise eligible. Which concept controls this selection?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS TTL<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF DR priority<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP MED only<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Segment Routing candidate-path preference<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. Segment Routing candidate-path preference<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Segment Routing policies can contain multiple candidate paths, allowing the network to maintain alternatives for a policy. Candidate-path preference is used to determine which eligible candidate should be selected when multiple candidates are available. This is different from MPLS TTL processing, OSPF DR election, or BGP MED. The candidate-path mechanism is particularly useful for designing flexible traffic-engineering policies in which a preferred path can be replaced by another eligible candidate when necessary. Engineers troubleshooting SR Policy selection should examine candidate-path state, validity, preference, and associated constraints.<\/span><\/p>\n<p><b>Question 254. A provider wants to advertise only a selected set of customer prefixes toward an upstream provider. The administrator has already created a prefix list. What additional mechanism is commonly used to apply the prefix-list decision to BGP route advertisements?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BFD session<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP route policy<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS LFIB<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IS-IS CSNP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. BGP route policy<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A prefix list defines which prefixes match a particular filtering condition, but a routing policy is commonly used to apply that matching result to BGP import or export behavior. On Cisco service-provider platforms, route-policy or route-map mechanisms can reference prefix lists and then permit, deny, or modify matching routes. This provides a structured method for controlling customer advertisements and preventing unintended route propagation. BFD detects forwarding failures, LFIB handles MPLS forwarding, and CSNP participates in IS-IS database synchronization. A route policy therefore completes the prefix-based BGP filtering process.<\/span><\/p>\n<p><b>Question 255. An OSPF router is connected to a network that requires communication with an area whose backbone path is unavailable. The administrator considers configuring an OSPF virtual link. What is the primary purpose of an OSPF virtual link?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> To extend logical connectivity to the OSPF backbone through a non-backbone area<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> To replace BGP route reflection<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> To create an MPLS VPN tunnel<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> To elect a second DR on every interface<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. To extend logical connectivity to the OSPF backbone through a non-backbone area<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">An OSPF virtual link can provide logical connectivity between an area border router and the backbone through a transit area when the normal physical topology does not provide the required Area 0 connectivity. It is intended to address specific OSPF topology situations and is not a replacement for BGP route reflection or an MPLS VPN mechanism. The virtual link is configured between routers that share a common transit area and logically extends the backbone relationship. Although useful for certain designs and migrations, virtual links should be carefully planned because they add control-plane complexity.<\/span><\/p>\n<p><b>Question 256. A provider wants multicast receivers to request traffic from one specific source rather than using a shared Rendezvous Point for a group. Which multicast model is designed specifically for this behavior?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Source-Specific Multicast<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Anycast RP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PIM Dense Mode<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MSDP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. Source-Specific Multicast<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Source-Specific Multicast, or SSM, allows receivers to identify both the multicast source and group they want to receive. This creates source-specific <\/span><span style=\"font-weight: 400;\">(S,G)<\/span><span style=\"font-weight: 400;\"> forwarding state and avoids the traditional shared Rendezvous Point model used by Any-Source Multicast. IGMPv3 provides the host-side signaling commonly used to express source-specific membership. Anycast RP is used to provide redundant RP functionality in ASM environments, while MSDP exchanges source information between RPs. SSM is therefore the multicast model specifically designed for applications where receivers know the desired source.<\/span><\/p>\n<p><b>Question 257. A BGP router receives two otherwise equivalent routes, one through eBGP and another through iBGP. Which path is normally preferred when the relevant earlier BGP attributes are equal?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> The iBGP route<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The route with the higher router ID immediately<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Both routes automatically<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The eBGP route<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. The eBGP route<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">When the relevant earlier BGP path attributes are equal, an eBGP-learned path is normally preferred over an iBGP-learned path in the Cisco BGP best-path process. This preference can be significant in service-provider networks where routes may be learned both externally and internally. The router does not automatically install both paths unless appropriate multipath configuration and eligibility conditions exist. Router ID is considered later as a tie-breaker. Engineers should therefore evaluate LOCAL_PREF, AS_PATH, origin, MED, and other earlier attributes before relying on the eBGP-versus-iBGP comparison.<\/span><\/p>\n<p><b>Question 258. An IS-IS administrator wants to reduce the number of transit paths selected through a router temporarily while still allowing the router to advertise information needed for its own reachable destinations. Which IS-IS feature can accomplish this?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> CSNP suppression<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP NO_EXPORT<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Overload bit<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS PHP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Overload bit<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The IS-IS overload bit allows a router to signal that it should not normally be used as a transit router. Other routers can take this indication into account when calculating paths and avoid selecting the overloaded router for transit traffic. The router can still advertise its own reachable prefixes, which is useful during startup, maintenance, or resource-related conditions. CSNPs are used for database synchronization, NO_EXPORT is a BGP community, and PHP is an MPLS label operation. The overload bit is therefore the appropriate IS-IS mechanism for temporarily discouraging transit use.<\/span><\/p>\n<p><b>Question 259. A service provider is troubleshooting an LDP-based MPLS LSP. The LDP session is established, but the expected FEC has no usable forwarding entry. Which component should be checked to determine whether the learned label has actually been installed for forwarding?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> LFIB<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> IGMP membership table<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP community table<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF neighbor priority<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. LFIB<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The LFIB is the forwarding-plane structure that determines how labeled packets are actually processed. An LDP session can be established and label bindings can exist in the LIB without the expected forwarding operation appearing in the LFIB. Engineers should therefore inspect the LFIB to determine whether the relevant incoming label has an associated outgoing label operation, next hop, and interface. The IGP route and LDP bindings should also be verified because they contribute to building the forwarding state. IGMP, BGP communities, and OSPF priority do not directly determine MPLS label forwarding.<\/span><\/p>\n<p><b>Question 260. A customer has two BGP paths to an external destination. The provider wants all routers inside the customer&#8217;s autonomous system to prefer one exit point for outbound traffic. Which attribute is most appropriate for communicating this preference through iBGP?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> AS_PATH<\/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;\"> ORIGIN<\/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 intended to communicate internal BGP path preference throughout an autonomous system. A higher LOCAL_PREF value is preferred and can be propagated through iBGP so that multiple routers consistently select the desired outbound exit. This makes LOCAL_PREF especially useful when a customer has multiple external providers or multiple connections to the same provider. AS_PATH is commonly manipulated to influence external inbound selection, while MED has more specific inter-AS path-selection behavior. ORIGIN identifies the origin type of a route and is lower in the decision process. LOCAL_PREF is therefore the appropriate mechanism for consistent internal outbound preference.<\/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 241. An IS-IS Level-1 router needs to reach a destination located outside its local area. Which route is commonly used to provide connectivity toward the rest of the IS-IS domain? A Level-1 route learned from an unrelated area A default [&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\/24596"}],"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=24596"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24596\/revisions"}],"predecessor-version":[{"id":24597,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24596\/revisions\/24597"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=24596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=24596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=24596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}