{"id":24611,"date":"2026-09-29T10:41:20","date_gmt":"2026-09-29T10:41:20","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=24611"},"modified":"2026-09-29T10:41:20","modified_gmt":"2026-09-29T10:41:20","slug":"cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-20-q381-400","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/cisco-ccnp-service-provider-300-510-practice-test-questions-and-exam-dumps-part-20-q381-400\/","title":{"rendered":"Cisco CCNP Service Provider 300-510 Practice Test Questions and Exam Dumps Part 20 Q381-400"},"content":{"rendered":"

View Full <\/b>Cisco CCNP Service Provider 300-510 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n

 <\/p>\n

Question 381. An IS-IS router receives a newer LSP from a neighbor, but the router’s local database still contains an older sequence number. What should occur?<\/b><\/p>\n

    \n
  1. <\/b> The router should discard the newer LSP<\/span><\/li>\n
  2. <\/b> The router should install the newer LSP and flood it as appropriate<\/span><\/li>\n
  3. <\/b> The router should restart the IS-IS process<\/span><\/li>\n
  4. <\/b> The router should convert the LSP to a BGP route<\/span><\/li>\n<\/ol>\n

    Correct Answer: 2. The router should install the newer LSP and flood it as appropriate<\/b><\/p>\n

    Explanation :-<\/b><\/p>\n

    IS-IS uses LSP sequence numbers to distinguish newer information from older copies. When a router receives an LSP with a higher sequence number than the version stored locally, it recognizes the received LSP as newer. The router updates its link-state database and floods the newer information to appropriate neighbors. This process allows the IS-IS domain to maintain synchronized topology information. A newer LSP does not require the routing process to restart, and IS-IS does not convert LSPs into BGP routes. Therefore, installing and appropriately flooding the newer LSP is the expected behavior.<\/span><\/p>\n

    Question 382. An OSPF network contains many prefixes within an area, and the ABR should advertise them externally as a smaller number of summarized routes. Which configuration feature should be used?<\/b><\/p>\n

      \n
    1. <\/b> OSPF router priority<\/span><\/li>\n
    2. <\/b> OSPF passive interface<\/span><\/li>\n
    3. <\/b> OSPF virtual link<\/span><\/li>\n
    4. <\/b> OSPF area range<\/span><\/li>\n<\/ol>\n

      Correct Answer: 4. OSPF area range<\/b><\/p>\n

      Explanation :-<\/b><\/p>\n

      The OSPF area range feature allows an ABR to summarize multiple prefixes belonging to an area before advertising the summarized information to other areas. This can reduce the number of inter-area routes and Type 3 Summary LSAs, resulting in a smaller routing table and less routing information propagation. Router priority is used during DR\/BDR elections, passive-interface controls adjacency formation, and a virtual link provides logical connectivity to the OSPF backbone. None of these features provides route summarization. Therefore, area range is the correct configuration feature for summarizing multiple prefixes at an ABR.<\/span><\/p>\n

      Question 383. A BGP router needs to exchange routes with another iBGP router but should avoid requiring every iBGP router in the AS to form a direct session with every other router. Which technology addresses this scalability issue?<\/b><\/p>\n

        \n
      1. <\/b> Route reflection<\/span><\/li>\n
      2. <\/b> MED<\/span><\/li>\n
      3. <\/b> BGP dampening<\/span><\/li>\n
      4. <\/b> AS_PATH prepending<\/span><\/li>\n<\/ol>\n

        Correct Answer: 1. Route reflection<\/b><\/p>\n

        Explanation :-<\/b><\/p>\n

        Route reflection addresses the scalability problem created by the traditional iBGP full-mesh requirement. A route reflector establishes sessions with clients and can reflect eligible routes learned from one client to other clients. This allows a provider to operate a large iBGP network without maintaining a direct session between every pair of routers. Route reflectors also use ORIGINATOR_ID and CLUSTER_LIST for loop prevention. MED influences path selection, dampening manages route instability, and AS_PATH prepending is commonly used for traffic engineering. Therefore, route reflection is the appropriate solution for scaling iBGP.<\/span><\/p>\n

        Question 384. Two BGP paths have identical relevant attributes except one path has a higher LOCAL_PREF. Which route should be selected?<\/b><\/p>\n

          \n
        1. <\/b> The route with the lower LOCAL_PREF<\/span><\/li>\n
        2. <\/b> The route with the shorter AS_PATH only<\/span><\/li>\n
        3. <\/b> The route with the higher LOCAL_PREF<\/span><\/li>\n
        4. <\/b> The route with the higher MED<\/span><\/li>\n<\/ol>\n

          Correct Answer: 3. The route with the higher LOCAL_PREF<\/b><\/p>\n

          Explanation :-<\/b><\/p>\n

          LOCAL_PREF is used inside an autonomous system to indicate the preferred outbound path. When comparing otherwise eligible BGP routes, a higher LOCAL_PREF is preferred over a lower value. Providers commonly manipulate LOCAL_PREF to make routers prefer one upstream or peering connection for outbound traffic. AS_PATH and MED are considered at other stages of the best-path process and cannot override a differing higher-priority attribute under the stated conditions. Therefore, the path with the higher LOCAL_PREF should be selected. This mechanism provides consistent internal outbound path preference across a provider network.<\/span><\/p>\n

          Question 385. A customer advertises the same IPv4 prefix as another customer into an MPLS L3VPN network. Which mechanism allows both routes to be represented uniquely in VPNv4?<\/b><\/p>\n

            \n
          1. <\/b> Route Target<\/span><\/li>\n
          2. <\/b> VPN label<\/span><\/li>\n
          3. <\/b> BGP Weight<\/span><\/li>\n
          4. <\/b> Route Distinguisher<\/span><\/li>\n<\/ol>\n

            Correct Answer: 4. Route Distinguisher<\/b><\/p>\n

            Explanation :-<\/b><\/p>\n

            The Route Distinguisher is used to make customer prefixes unique within the VPNv4 address family. Different customers can therefore use identical IPv4 prefixes without the provider’s MP-BGP system treating them as the same VPN route. The RD is combined with the IPv4 prefix to form a unique VPNv4 route. Route Targets have a different purpose: they control VPN route import and export between VRFs. VPN labels identify the forwarding context at the egress PE, while Weight is a local BGP path-selection attribute. Therefore, the RD provides the required uniqueness.<\/span><\/p>\n

            Question 386. A provider wants a customer route to remain distributed inside the provider’s autonomous system but not be advertised to external autonomous systems. Which BGP community is appropriate?<\/b><\/p>\n

              \n
            1. <\/b> NO_EXPORT<\/span><\/li>\n
            2. <\/b> NO_ADVERTISE<\/span><\/li>\n
            3. <\/b> Additive<\/span><\/li>\n
            4. <\/b> ORIGIN<\/span><\/li>\n<\/ol>\n

              Correct Answer: 1. NO_EXPORT<\/b><\/p>\n

              Explanation :-<\/b><\/p>\n

              NO_EXPORT is a well-known BGP community used to restrict a route from being advertised outside the local autonomous system or confederation boundary according to standard behavior. This allows the route to continue to be distributed internally when appropriate. NO_ADVERTISE is more restrictive because it prevents advertisement to any BGP peer. Additive is used to preserve existing communities when adding another community, while ORIGIN is a BGP path attribute used during route selection. Therefore, NO_EXPORT is the correct community when internal distribution is permitted but external propagation should be restricted.<\/span><\/p>\n

              Question 387. A BGP administrator wants to advertise a backup route only when a preferred route is no longer present. Which feature should be configured?<\/b><\/p>\n

                \n
              1. <\/b> BGP Add-Path<\/span><\/li>\n
              2. <\/b> BGP maximum-prefix<\/span><\/li>\n
              3. <\/b> BGP conditional advertisement<\/span><\/li>\n
              4. <\/b> BGP route reflection<\/span><\/li>\n<\/ol>\n

                Correct Answer: 3. BGP conditional advertisement<\/b><\/p>\n

                Explanation :-<\/b><\/p>\n

                BGP conditional advertisement allows the advertisement of one route to depend on the presence or absence of another route or specified routing condition. This makes it useful for backup-path designs where a secondary route should be announced only when primary connectivity is unavailable. Add-Path is used to advertise multiple paths for the same prefix, maximum-prefix protects against excessive route reception, and route reflection improves iBGP scalability. Therefore, conditional advertisement is the feature that directly supports the requirement for conditional backup-route advertisement.<\/span><\/p>\n

                Question 388. An MPLS transit router receives label 120 and its LFIB specifies that the outgoing label should be 450. Which operation is performed?<\/b><\/p>\n

                  \n
                1. <\/b> Push<\/span><\/li>\n
                2. <\/b> Swap<\/span><\/li>\n
                3. <\/b> Pop<\/span><\/li>\n
                4. <\/b> PHP<\/span><\/li>\n<\/ol>\n

                  Correct Answer: 2. Swap<\/b><\/p>\n

                  Explanation :-<\/b><\/p>\n

                  MPLS label swapping occurs when a router replaces an incoming top label with a different outgoing label according to its LFIB. In this scenario, label 120 is replaced by label 450, so the router is performing a label swap. A push operation adds a label, while a pop removes one. Penultimate-hop popping is a specific label-removal behavior normally performed by the router immediately before the egress LSR. Therefore, replacing label 120 with label 450 is an MPLS swap operation.<\/span><\/p>\n

                  Question 389. A provider needs to prevent a customer’s BGP route from being advertised to any other BGP peer. Which community provides this restriction?<\/b><\/p>\n

                    \n
                  1. <\/b> NO_ADVERTISE<\/span><\/li>\n
                  2. <\/b> NO_EXPORT<\/span><\/li>\n
                  3. <\/b> LOCAL_PREF<\/span><\/li>\n
                  4. <\/b> MED<\/span><\/li>\n<\/ol>\n

                    Correct Answer: 1. NO_ADVERTISE<\/b><\/p>\n

                    Explanation :-<\/b><\/p>\n

                    NO_ADVERTISE is a well-known BGP community that instructs a BGP speaker not to advertise the associated route to any BGP peer. This is more restrictive than NO_EXPORT, which permits internal distribution while restricting propagation outside the local AS or confederation boundary. LOCAL_PREF is used to influence outbound path selection, while MED can influence how neighboring autonomous systems select an entry point under applicable conditions. Therefore, when the requirement is to stop the route from being advertised to any BGP peer, NO_ADVERTISE is the appropriate community.<\/span><\/p>\n

                    Question 390. A Segment Routing network needs to force traffic over a specific link between two routers rather than simply forwarding toward the destination node. Which SID should be used?<\/b><\/p>\n

                      \n
                    1. <\/b> Node SID<\/span><\/li>\n
                    2. <\/b> Binding SID<\/span><\/li>\n
                    3. <\/b> VPN label<\/span><\/li>\n
                    4. <\/b> Adjacency SID<\/span><\/li>\n<\/ol>\n

                      Correct Answer: 4. Adjacency SID<\/b><\/p>\n

                      Explanation :-<\/b><\/p>\n

                      An Adjacency SID represents a specific adjacency or link in a Segment Routing topology. It can be included in a segment list to force traffic through that particular link, providing more precise path control than a Node SID. A Node SID normally directs traffic toward a node using the applicable shortest-path behavior. A Binding SID identifies an SR Policy or segment-list construct, while a VPN label belongs to MPLS VPN forwarding. Therefore, an Adjacency SID is the appropriate SID when explicit link-level steering is required.<\/span><\/p>\n

                      Question 391. An IS-IS router discovers through a CSNP that its local database is missing an LSP. Which protocol data unit should be used to request the missing information?<\/b><\/p>\n

                        \n
                      1. <\/b> Hello PDU<\/span><\/li>\n
                      2. <\/b> PSNP<\/span><\/li>\n
                      3. <\/b> BGP UPDATE<\/span><\/li>\n
                      4. <\/b> OSPF LSU<\/span><\/li>\n<\/ol>\n

                        Correct Answer: 2. PSNP<\/b><\/p>\n

                        Explanation :-<\/b><\/p>\n

                        IS-IS uses CSNPs to communicate information about the LSP database. When a router identifies that it is missing an LSP or has an outdated copy, it can use a Partial Sequence Number PDU to request the required information. PSNPs therefore support reliable synchronization of the IS-IS link-state database. Hello PDUs are used for adjacency establishment and maintenance, while BGP UPDATE and OSPF LSU messages belong to different routing protocols. Therefore, a PSNP is the appropriate mechanism for requesting the missing IS-IS LSP.<\/span><\/p>\n

                        Question 392. A PE router receives a VPNv4 route with an RT that does not match any import RT configured for the destination VRF. What should normally happen?<\/b><\/p>\n

                          \n
                        1. <\/b> The route is automatically imported<\/span><\/li>\n
                        2. <\/b> The route becomes a global IPv4 route<\/span><\/li>\n
                        3. <\/b> The route is not imported into that VRF<\/span><\/li>\n
                        4. <\/b> The RD is automatically changed<\/span><\/li>\n<\/ol>\n

                          Correct Answer: 3. The route is not imported into that VRF<\/b><\/p>\n

                          Explanation :-<\/b><\/p>\n

                          Route Targets determine VPN route import and export policy. When a PE receives a VPNv4 route, it can import that route into a VRF only when an appropriate Route Target matches the VRF’s import policy. If there is no matching import RT, the route can remain visible in the VPNv4 BGP table but is not imported into the target VRF. The RD provides uniqueness and is not automatically changed to solve an import-policy mismatch. Therefore, the route should not be imported into the VRF until the Route Target policy is corrected.<\/span><\/p>\n

                          Question 393. An OSPF router in an NSSA redistributes an external route. Which LSA type is used inside the NSSA before the route is potentially translated by the ABR?<\/b><\/p>\n

                            \n
                          1. <\/b> Type 1<\/span><\/li>\n
                          2. <\/b> Type 3<\/span><\/li>\n
                          3. <\/b> Type 5<\/span><\/li>\n
                          4. <\/b> Type 7<\/span><\/li>\n<\/ol>\n

                            Correct Answer: 4. Type 7<\/b><\/p>\n

                            Explanation :-<\/b><\/p>\n

                            An NSSA allows external routes to be introduced into the area while preventing normal Type 5 external LSAs from being flooded into it. External routes redistributed within an NSSA are represented using Type 7 LSAs. An ABR can translate appropriate Type 7 information into Type 5 LSAs when advertising the route toward other areas. Type 1 LSAs describe routers, Type 3 LSAs represent inter-area networks, and Type 5 LSAs represent external routes in the regular OSPF domain. Therefore, Type 7 is the correct LSA type inside the NSSA.<\/span><\/p>\n

                            Question 394. A service provider wants to make one outbound BGP exit more attractive to routers throughout the AS. Which attribute should normally be increased?<\/b><\/p>\n

                              \n
                            1. <\/b> LOCAL_PREF<\/span><\/li>\n
                            2. <\/b> MED<\/span><\/li>\n
                            3. <\/b> AS_PATH<\/span><\/li>\n
                            4. <\/b> ORIGIN<\/span><\/li>\n<\/ol>\n

                              Correct Answer: 1. LOCAL_PREF<\/b><\/p>\n

                              Explanation :-<\/b><\/p>\n

                              LOCAL_PREF is designed to influence outbound path selection within an autonomous system. A higher LOCAL_PREF value makes the associated route more preferred, allowing an operator to direct traffic toward a desired external exit. The attribute is distributed through iBGP and can therefore provide consistent policy across the AS. AS_PATH represents the sequence of autonomous systems traversed, MED can influence inbound path selection by a neighboring AS under applicable conditions, and ORIGIN is considered later in the best-path process. Therefore, increasing LOCAL_PREF is the appropriate method for preferring an outbound BGP exit.<\/span><\/p>\n

                              Question 395. A BGP session should quickly detect forwarding-path failure rather than wait for the normal BGP hold timer. Which protocol should be integrated with the session?<\/b><\/p>\n

                                \n
                              1. <\/b> LDP<\/span><\/li>\n
                              2. <\/b> BFD<\/span><\/li>\n
                              3. <\/b> MSDP<\/span><\/li>\n
                              4. <\/b> RSVP-TE<\/span><\/li>\n<\/ol>\n

                                Correct Answer: 2. BFD<\/b><\/p>\n

                                Explanation :-<\/b><\/p>\n

                                Bidirectional Forwarding Detection provides rapid failure detection for forwarding paths and can be integrated with BGP. BFD operates independently of normal BGP keepalive and hold timers, allowing a forwarding failure to be detected much more quickly when short BFD intervals are configured. LDP handles MPLS label distribution, RSVP-TE provides traffic-engineering functions, and MSDP exchanges multicast source information. Therefore, BFD is the appropriate protocol for accelerating failure detection associated with a BGP session.<\/span><\/p>\n

                                Question 396. A multicast router receives <\/b>(S,G)<\/b> traffic on the wrong incoming interface according to its unicast route toward source S. Which process causes the router to reject the traffic?<\/b><\/p>\n

                                  \n
                                1. <\/b> BSR election<\/span><\/li>\n
                                2. <\/b> MSDP synchronization<\/span><\/li>\n
                                3. <\/b> IGMP membership processing<\/span><\/li>\n
                                4. <\/b> RPF check<\/span><\/li>\n<\/ol>\n

                                  Correct Answer: 4. RPF check<\/b><\/p>\n

                                  Explanation :-<\/b><\/p>\n

                                  The Reverse Path Forwarding check verifies that multicast packets arrive through the interface the unicast routing table identifies as the appropriate path toward the source. If <\/span>(S,G)<\/span> traffic arrives on another interface, the RPF check can fail and the router may discard the traffic. BSR handles RP information distribution, MSDP exchanges multicast source information, and IGMP handles receiver membership. These mechanisms do not replace the multicast forwarding-plane RPF validation. Therefore, an RPF check is responsible for determining whether the incoming multicast traffic arrived through the expected source-facing interface.<\/span><\/p>\n

                                  Question 397. A provider uses 6PE to transport IPv6 traffic across an MPLS core. Which routing technology is used to distribute the IPv6 reachability information between the PE routers?<\/b><\/p>\n

                                    \n
                                  1. <\/b> MP-BGP<\/span><\/li>\n
                                  2. <\/b> PIM-SM<\/span><\/li>\n
                                  3. <\/b> IS-IS Level-1 only<\/span><\/li>\n
                                  4. <\/b> IGMPv3<\/span><\/li>\n<\/ol>\n

                                    Correct Answer: 1. MP-BGP<\/b><\/p>\n

                                    Explanation :-<\/b><\/p>\n

                                    6PE uses Multiprotocol BGP to exchange IPv6 reachability information across an MPLS-enabled IPv4 provider core. The provider core does not need to run IPv6 in its IGP for the 6PE architecture. MPLS labels provide the transport across the core, while MP-BGP carries the IPv6 routing information between PE routers. PIM-SM and IGMPv3 are multicast-related technologies, and IS-IS Level-1 alone does not provide the MP-BGP-based 6PE architecture. Therefore, MP-BGP is the routing technology used to exchange IPv6 reachability between the 6PE routers.<\/span><\/p>\n

                                    Question 398. A BGP router receives an eBGP route whose next-hop address is not reachable through the local routing table. What is the likely result?<\/b><\/p>\n

                                      \n
                                    1. <\/b> The router automatically changes the next hop<\/span><\/li>\n
                                    2. <\/b> The route becomes a default route<\/span><\/li>\n
                                    3. <\/b> The route is installed regardless of next-hop reachability<\/span><\/li>\n
                                    4. <\/b> The route may not become usable for forwarding<\/span><\/li>\n<\/ol>\n

                                      Correct Answer: 4. The route may not become usable for forwarding<\/b><\/p>\n

                                      Explanation :-<\/b><\/p>\n

                                      BGP route installation normally depends on successful recursive resolution of the route’s next-hop address. If the next hop cannot be resolved through the local routing table, the route may remain present in BGP information while not becoming an active forwarding route. This is why next-hop reachability is a common BGP troubleshooting requirement. The router does not automatically convert an unreachable route into a default route or necessarily change the next hop unless a policy or feature such as next-hop-self applies. Therefore, an unreachable next hop can prevent the route from becoming usable for forwarding.<\/span><\/p>\n

                                      Question 399. A route reflector receives a reflected BGP route containing its own cluster ID in the CLUSTER_LIST. What action should it take?<\/b><\/p>\n

                                        \n
                                      1. <\/b> Increase the route’s LOCAL_PREF<\/span><\/li>\n
                                      2. <\/b> Reflect the route again<\/span><\/li>\n
                                      3. <\/b> Reject the route<\/span><\/li>\n
                                      4. <\/b> Remove the CLUSTER_LIST<\/span><\/li>\n<\/ol>\n

                                        Correct Answer: 3. Reject the route<\/b><\/p>\n

                                        Explanation :-<\/b><\/p>\n

                                        The CLUSTER_LIST attribute provides route-reflector loop prevention. A route reflector adds its cluster ID when reflecting routes. If the same route later returns with that router’s own cluster ID already present in the CLUSTER_LIST, the router recognizes a potential reflection loop and rejects the route. It should not remove the attribute and reflect the route again. LOCAL_PREF does not address this loop condition. Therefore, rejecting the route when its own cluster ID is detected is the expected route-reflector behavior.<\/span><\/p>\n

                                        Question 400. A service provider wants a BGP speaker to advertise more than one valid path for the same prefix to a peer. Which feature enables this behavior?<\/b><\/p>\n

                                          \n
                                        1. <\/b> BGP maximum-prefix<\/span><\/li>\n
                                        2. <\/b> BGP Add-Path<\/span><\/li>\n
                                        3. <\/b> BGP route dampening<\/span><\/li>\n
                                        4. <\/b> BGP conditional advertisement<\/span><\/li>\n<\/ol>\n

                                          Correct Answer: 2. BGP Add-Path<\/b><\/p>\n

                                          Explanation :-<\/b><\/p>\n

                                          BGP Add-Path allows a BGP speaker to advertise multiple paths for the same prefix instead of sending only the selected best path. This can provide additional path diversity to downstream routers and can support convergence and traffic-engineering objectives. Maximum-prefix limits the number of routes received from a neighbor, route dampening reduces the impact of unstable route announcements, and conditional advertisement controls route announcements according to specified conditions. Therefore, BGP Add-Path is the feature specifically designed to allow multiple valid paths for the same prefix to be advertised to a peer.<\/span><\/p>\n

                                           <\/p>\n","protected":false},"excerpt":{"rendered":"

                                          View Full Cisco CCNP Service Provider 300-510 Exam Dumps and Practice Test Dumps   Question 381. An IS-IS router receives a newer LSP from a neighbor, but the router’s local database still contains an older sequence number. What should occur? The router should discard the newer LSP The router should install the newer LSP and […]<\/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\/24611"}],"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=24611"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24611\/revisions"}],"predecessor-version":[{"id":24612,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/24611\/revisions\/24612"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=24611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=24611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=24611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}