{"id":24598,"date":"2026-09-29T10:38:24","date_gmt":"2026-09-29T10:38:24","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=24598"},"modified":"2026-09-29T10:38:24","modified_gmt":"2026-09-29T10:38:24","slug":"cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-14-q261-280","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-14-q261-280\/","title":{"rendered":"Cisco\u00a0CCNP Service Provider 300-510 Practice Test Questions and Exam Dumps Part 14 Q261-280"},"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 261. An IS-IS Level-2 router receives an LSP with a newer sequence number than the version stored in its local database. What should the router do?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Ignore the LSP because only the DIS can update databases<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Convert the LSP into an OSPF Type 5 LSA<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Update its database and flood the newer LSP to appropriate IS-IS neighbors<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Remove the corresponding Level-2 adjacency<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Update its database and flood the newer LSP to appropriate IS-IS neighbors<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">IS-IS uses sequence numbers to determine whether an LSP is newer or older than the copy currently stored in a router&#8217;s link-state database. When a router receives a newer version, it updates its database and participates in flooding that information through the appropriate IS-IS topology. This mechanism allows all routers in the relevant flooding scope to converge on the newest topology information. The router does not convert IS-IS LSPs into OSPF LSAs, and receiving a newer LSP does not indicate that the adjacency should be removed. Sequence-number processing is therefore fundamental to reliable IS-IS database synchronization.<\/span><\/p>\n<p><b>Question 262. A provider has an OSPF area containing an ABR that summarizes several internal prefixes into a single advertisement toward another area. Which OSPF feature is designed to perform this type of inter-area summarization?<\/b><\/p>\n<ol>\n<li><b><\/b> <span style=\"font-weight: 400;\">area range<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">default-information originate<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">distribute-list<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">ip ospf cost<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. <\/b><b>area range<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The OSPF <\/span><span style=\"font-weight: 400;\">area range<\/span><span style=\"font-weight: 400;\"> feature allows an ABR to summarize multiple intra-area prefixes when advertising them into another OSPF area. Summarization can reduce the number of inter-area routes and limit the amount of routing information that needs to be processed by routers in other areas. <\/span><span style=\"font-weight: 400;\">default-information originate<\/span><span style=\"font-weight: 400;\"> is used to advertise a default route, while OSPF interface cost affects path selection rather than prefix aggregation. Filtering mechanisms can restrict route propagation, but <\/span><span style=\"font-weight: 400;\">area range<\/span><span style=\"font-weight: 400;\"> specifically provides the summarization function described in this scenario.<\/span><\/p>\n<p><b>Question 263. A BGP administrator wants a route learned from one iBGP neighbor to be advertised to another iBGP neighbor. The routers are not configured in a full mesh. Which design feature is required to overcome the normal iBGP split-horizon behavior?<\/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;\"> AS_PATH prepending<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route reflection<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP maximum-prefix<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Route reflection<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Traditional iBGP routers do not advertise routes learned from one iBGP peer to another iBGP peer. This split-horizon behavior prevents certain routing loops but creates a requirement for a full-mesh iBGP topology. Route reflection provides a scalable alternative by allowing designated route reflectors to receive routes from clients and reflect appropriate routes to other clients. This removes the need for every iBGP speaker to maintain a direct session with every other speaker. MED, AS_PATH prepending, and maximum-prefix address path selection or session protection rather than the fundamental iBGP propagation limitation.<\/span><\/p>\n<p><b>Question 264. A service provider has two external BGP paths to the same destination. The provider wants one path to be preferred by its own routers for outbound traffic, without relying on AS_PATH length. Which attribute should be increased on the preferred path?<\/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;\"> ORIGIN<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> NEXT_HOP<\/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 the primary BGP attribute commonly used within an autonomous system to select a preferred outbound path. A higher LOCAL_PREF value is preferred when comparing otherwise eligible paths. Because the attribute is distributed through iBGP, it can provide consistent exit-point selection throughout the provider&#8217;s network. AS_PATH is evaluated later in the best-path process and is often manipulated to influence how external networks select inbound paths. MED can also influence path selection under specific conditions, but LOCAL_PREF is the appropriate mechanism when the goal is to establish an internal preference for outbound traffic.<\/span><\/p>\n<p><b>Question 265. An MPLS router receives a packet with an incoming transport label. The LFIB specifies that the router should replace the incoming label with a different outgoing label before forwarding the packet. Which MPLS operation is occurring?<\/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;\"> Penultimate-hop routing<\/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;\">MPLS label swapping occurs when a router removes the incoming top label and replaces it with another label before forwarding the packet. The LFIB contains the information required to perform this operation, including the outgoing label and forwarding interface. A pop operation removes the label without replacing it, while a push operation adds a new label to the packet&#8217;s label stack. Penultimate Hop Popping is a specific use of the pop operation near an MPLS egress. Understanding the distinction between push, swap, and pop is important when analyzing MPLS forwarding behavior.<\/span><\/p>\n<p><b>Question 266. A network engineer configures a BGP session using loopback addresses between two eBGP peers separated by several routed hops. The TCP session does not establish with the default eBGP TTL behavior. Which configuration addresses the multi-hop requirement?<\/b><\/p>\n<ol>\n<li><b><\/b> <span style=\"font-weight: 400;\">next-hop-self<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">maximum-prefix<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">route-reflector-client<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">ebgp-multihop<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. <\/b><b>ebgp-multihop<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">eBGP normally expects a directly connected peer and uses a default TTL suitable for a single hop. When eBGP peers are separated by multiple routed hops and use loopback addresses, <\/span><span style=\"font-weight: 400;\">ebgp-multihop<\/span><span style=\"font-weight: 400;\"> can be configured to permit the TCP session across the required number of hops. IP reachability between the loopbacks must still exist. <\/span><span style=\"font-weight: 400;\">next-hop-self<\/span><span style=\"font-weight: 400;\"> changes the BGP next-hop attribute, maximum-prefix limits received routes, and route-reflector-client is an iBGP scalability feature. Therefore, <\/span><span style=\"font-weight: 400;\">ebgp-multihop<\/span><span style=\"font-weight: 400;\"> is the configuration directly associated with multi-hop eBGP peering.<\/span><\/p>\n<p><b>Question 267. An OSPF administrator wants an area to receive a default route from an ABR while reducing the amount of external routing information that routers in the area must maintain. Which area type is commonly designed for this purpose?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Stub area<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Backbone area<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Transit area<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Standard area with no restrictions<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. Stub area<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">An OSPF stub area is designed to reduce the amount of external routing information carried inside the area. Instead of receiving external Type 5 LSAs, routers in a stub area can use a default route advertised by the ABR to reach destinations outside the area. This reduces the size and complexity of the routing information maintained by routers inside the stub area. A backbone area provides the central OSPF inter-area connectivity function, while a standard area permits normal external route propagation. Stub-area design must also account for restrictions on certain LSA types and topology requirements.<\/span><\/p>\n<p><b>Question 268. A provider&#8217;s BGP policy adds a new community to an existing set of communities on a route. The administrator does not want the existing communities removed. Which behavior should be used?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Replace<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Additive<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Local-only<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> No-export<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. Additive<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The additive behavior allows a new BGP community to be added while preserving the communities that are already attached to the route. Without additive handling, a policy operation that sets communities can replace the existing community list depending on the implementation and configuration. Preserving existing communities is important when multiple routing policies rely on different community values. NO_EXPORT is a specific well-known community rather than a generic community-modification behavior. Therefore, the additive option is appropriate when the administrator wants to augment the route&#8217;s community set without removing existing values.<\/span><\/p>\n<p><b>Question 269. An MPLS L3VPN administrator sees a VPNv4 route in MP-BGP, but the route is not installed in the expected VRF. The route has a valid RD, but the receiving VRF&#8217;s import policy does not match the route&#8217;s Route Target. What should be corrected?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> The MPLS transport label<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The OSPF router ID<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The BGP keepalive timer<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> The VRF import Route Target<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. The VRF import Route Target<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The Route Distinguisher makes VPN prefixes unique, but the Route Target determines whether a VPN route should be imported into a particular VRF. Therefore, a valid RD does not guarantee that a route will appear in the customer routing table. If the exported Route Target attached to the VPNv4 route does not match the receiving VRF&#8217;s import policy, the route can remain visible in MP-BGP while being excluded from that VRF. Correcting the import Route Target or policy resolves the control-plane mismatch. Transport labels and BGP timers do not determine VRF route import eligibility.<\/span><\/p>\n<p><b>Question 270. An IS-IS administrator wants to authenticate IS-IS control-plane messages exchanged between routers to reduce the risk of unauthorized routing information being accepted. Which capability should be configured?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> IS-IS authentication<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP community filtering<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS PHP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF route summarization<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. IS-IS authentication<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">IS-IS authentication provides a mechanism for validating IS-IS protocol packets and helping protect the routing domain from unauthorized control-plane participation. Authentication can be applied according to the supported IS-IS authentication mechanisms and platform configuration. This is distinct from BGP community filtering, which controls route policy, and MPLS PHP, which is a forwarding operation. OSPF summarization affects routing information rather than authenticating IS-IS messages. In a service-provider environment, authentication is one component of protecting the integrity of the IGP control plane.<\/span><\/p>\n<p><b>Question 271. A PIM-SM deployment uses a shared tree and an administrator needs routers to learn which router is acting as the Rendezvous Point for multicast groups. Which PIM mechanism can distribute RP information dynamically?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> MSDP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BSR<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BFD<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LDP<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. BSR<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The PIM Bootstrap Router (BSR) mechanism can distribute Rendezvous Point information dynamically throughout a PIM domain. BSR allows candidate BSRs and candidate RPs to participate in the process of selecting and distributing RP information. This reduces the need to manually configure the same static RP information on every router. MSDP is used to exchange source-active information between RPs in certain Any-Source Multicast designs, while BFD provides failure detection and LDP distributes MPLS labels. BSR is therefore the PIM mechanism directly associated with dynamic RP information distribution.<\/span><\/p>\n<p><b>Question 272. A customer uses the same IPv4 prefix in two separate VPNs. The provider must maintain both routes independently in the VPNv4 routing table. Which combination provides uniqueness and controls VPN membership?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> MED and LOCAL_PREF<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> MPLS label and BFD<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Distinguisher and Route Target<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> OSPF area ID and router ID<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Route Distinguisher and Route Target<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The Route Distinguisher and Route Target perform different but complementary functions in an MPLS L3VPN. The RD makes identical IPv4 prefixes from different VPNs unique within the VPNv4 address family. The RT controls which VRFs import and export those VPN routes. For example, two customers can both advertise the same IPv4 prefix while their different RDs maintain separate VPNv4 entries. Their RT policies then determine where those routes are imported. MPLS labels provide forwarding separation, but they do not replace the RD and RT functions.<\/span><\/p>\n<p><b>Question 273. A BGP router receives an update containing the NO_ADVERTISE community. What should the router normally do with that route regarding further BGP advertisements?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> It should not advertise the route to any BGP peer<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> It should advertise the route only to eBGP peers<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> It should automatically remove the community and advertise the route<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> It should increase the route&#8217;s LOCAL_PREF<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. It should not advertise the route to any BGP peer<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">NO_ADVERTISE is a well-known BGP community that instructs a receiving BGP speaker not to advertise the associated route to any BGP peer. It therefore imposes a stronger propagation restriction than NO_EXPORT. NO_EXPORT permits internal use within the receiving autonomous system while preventing external advertisement beyond the applicable boundary. The community does not automatically increase LOCAL_PREF or require the router to remove the community. When troubleshooting route propagation, checking well-known communities is important because a route can be present in the BGP table yet intentionally prevented from being advertised.<\/span><\/p>\n<p><b>Question 274. An OSPF router receives a Type 3 LSA from an ABR describing a network located in another OSPF area. What type of reachability does this LSA primarily represent?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> External autonomous-system reachability<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Router-to-router authentication information<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Link-local IPv6 reachability<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Inter-area network reachability<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. Inter-area network reachability<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">OSPF Type 3 Summary LSAs are generated by ABRs to advertise networks from one area into another. They therefore represent inter-area network reachability. Type 5 LSAs are used for external routes, while Type 7 LSAs are used for external routes inside NSSAs. Type 4 LSAs advertise reachability to an ASBR rather than directly describing the external network itself. Understanding the different LSA types is essential when troubleshooting why an inter-area prefix appears or fails to appear in an OSPF routing table.<\/span><\/p>\n<p><b>Question 275. A service provider wants to provide rapid detection of a failed forwarding path for an established BGP session. Which mechanism can be associated with BGP for this purpose?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> CSNP<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BFD<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Route Target<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Prefix SID<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. BFD<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">BFD can be associated with BGP to provide rapid detection of forwarding-path failures. Instead of relying solely on BGP&#8217;s comparatively longer hold timer, BFD can detect a failure quickly and notify the associated routing protocol so that the BGP session can be brought down and alternate routing can converge. CSNP is an IS-IS database-synchronization mechanism, Route Target controls MPLS VPN route import and export, and Prefix SID is a Segment Routing identifier. BFD is therefore appropriate when fast, protocol-independent failure detection is required for BGP.<\/span><\/p>\n<p><b>Question 276. A Segment Routing engineer wants a SID that identifies a specific outgoing adjacency so traffic can be forced over a particular link. Which SID is appropriate?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Node SID<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Binding SID<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Adjacency SID<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> VPN SID<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. Adjacency SID<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">An Adjacency SID represents a specific adjacency from a Segment Routing node. Including an Adjacency SID in a segment list allows traffic to be directed over that particular link, providing more precise path control than a Node SID. A Node SID identifies a node or associated prefix and normally uses the IGP shortest path toward that node. A Binding SID identifies a Segment Routing policy or bound segment list. Therefore, an Adjacency SID is the appropriate identifier when the engineering requirement is explicit link-level steering.<\/span><\/p>\n<p><b>Question 277. A provider wants to reduce the number of prefixes advertised by an OSPF ABR into another area while preserving reachability to multiple more-specific networks. Which approach is most appropriate?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> Enable BGP Add-Path<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Configure PIM BSR<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Increase the OSPF hello interval<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> Configure OSPF area summarization<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 4. Configure OSPF area summarization<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">OSPF area summarization allows an ABR to advertise a summarized prefix representing multiple more-specific routes from an area. This can reduce the size of routing tables and limit the amount of topology information that needs to be processed outside the originating area. The summary must be chosen carefully so that the desired address space remains reachable and unintended traffic black holes are avoided. BGP Add-Path and PIM BSR are unrelated to OSPF prefix summarization, while changing the Hello interval affects neighbor maintenance rather than route aggregation.<\/span><\/p>\n<p><b>Question 278. A BGP administrator needs to ensure that a route learned from an eBGP peer can be advertised internally with a next hop that is reachable through the provider&#8217;s IGP. Which BGP configuration is commonly used on the internal-facing router?<\/b><\/p>\n<ol>\n<li><b><\/b> <span style=\"font-weight: 400;\">next-hop-self<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">maximum-prefix<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">ebgp-multihop<\/span><\/li>\n<li><b><\/b> <span style=\"font-weight: 400;\">send-community<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 1. <\/b><b>next-hop-self<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The <\/span><span style=\"font-weight: 400;\">next-hop-self<\/span><span style=\"font-weight: 400;\"> configuration causes a BGP router to advertise itself as the next hop when sending appropriate BGP routes to an internal peer. This is commonly used when an eBGP-learned route has a next-hop address that would otherwise be unreachable from the internal network. By setting the internal router as the next hop, the provider can rely on its IGP to provide reachability to that router. Maximum-prefix limits received routes, eBGP multihop affects external session establishment, and send-community controls community propagation. Next-hop-self therefore addresses the next-hop reachability requirement.<\/span><\/p>\n<p><b>Question 279. A multicast source is connected to one router, while another router on the same multiaccess segment also receives the same multicast traffic. PIM routers must determine which router should forward traffic onto the shared segment. Which mechanism resolves this situation?<\/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;\"> OSPF DR election<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> PIM Assert<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> LDP targeted session<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 3. PIM Assert<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">PIM Assert is used on multiaccess networks when multiple PIM routers could forward the same multicast traffic onto the shared segment. The routers participate in an Assert process to determine which router should remain the forwarder for the relevant multicast flow. This prevents duplicate multicast forwarding across the segment. OSPF DR election serves an OSPF control-plane function and does not determine the PIM multicast forwarder. BGP Add-Path and LDP targeted sessions address unrelated routing and MPLS functions. PIM Assert is therefore the mechanism used to resolve competing multicast forwarders.<\/span><\/p>\n<p><b>Question 280. A provider wants to advertise multiple BGP paths for the same prefix to improve path diversity and downstream convergence. Standard BGP normally advertises only the best path. Which feature changes this behavior?<\/b><\/p>\n<ol>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP route dampening<\/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;\"> BGP maximum-prefix<\/span><\/li>\n<li><b><\/b><span style=\"font-weight: 400;\"> BGP TTL security<\/span><\/li>\n<\/ol>\n<p><b>Correct Answer: 2. BGP Add-Path<\/b><\/p>\n<p><b>Explanation :-<\/b><\/p>\n<p><span style=\"font-weight: 400;\">BGP Add-Path extends normal BGP behavior by allowing a router to advertise multiple paths for the same prefix to a neighbor. This can provide additional path diversity and allow downstream routers to retain alternate paths rather than relying on only one advertised best path. It can be useful for improving convergence and supporting certain traffic-engineering designs. Route dampening addresses route instability, maximum-prefix protects a session from excessive route reception, and TTL security protects eBGP sessions against certain unexpected low-TTL packets. Add-Path is specifically designed to provide multiple advertised paths.<\/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 261. An IS-IS Level-2 router receives an LSP with a newer sequence number than the version stored in its local database. What should the router do? Ignore the LSP because only the DIS can update databases Convert the LSP into [&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\/24598"}],"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=24598"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24598\/revisions"}],"predecessor-version":[{"id":24599,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24598\/revisions\/24599"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=24598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=24598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=24598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}