{"id":19888,"date":"2026-09-23T09:17:37","date_gmt":"2026-09-23T09:17:37","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=19888"},"modified":"2026-09-23T09:17:37","modified_gmt":"2026-09-23T09:17:37","slug":"huawei-h12-831-practice-test-questions-and-exam-dumps-part6-q101-120","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/huawei-h12-831-practice-test-questions-and-exam-dumps-part6-q101-120\/","title":{"rendered":"Huawei H12-831 Practice Test Questions and Exam Dumps Part6 Q101-120"},"content":{"rendered":"

View Full <\/b>Huawei H12-831 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/h2>\n

 <\/p>\n

Question 101.<\/b><\/p>\n

In OSPF, what is the main purpose of a Type 1 Router LSA?<\/b><\/p>\n

    \n
  1. <\/b> Describe a router’s links and costs within an OSPF area<\/span><\/li>\n
  2. <\/b> Advertise external BGP routes<\/span><\/li>\n
  3. <\/b> Carry MPLS labels<\/span><\/li>\n
  4. <\/b> Identify DHCP servers<\/span><\/li>\n<\/ol>\n

    Correct Answer: 1. Describe a router’s links and costs within an OSPF area<\/b><\/p>\n

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

    A Type 1 Router LSA is originated by every OSPF router for each area in which it participates. It describes the router’s local OSPF links, their states, and associated costs. Routers use these LSAs to build the area’s link-state database and calculate shortest paths with the SPF algorithm. Type 1 LSAs remain within the originating area and are not flooded unchanged into other areas. External routes, MPLS labels, and DHCP information are handled by different protocols and mechanisms.<\/span><\/p>\n

    Question 102.<\/b><\/p>\n

    Which OSPF LSA is generated by the Designated Router on a broadcast segment?<\/b><\/p>\n

      \n
    1. <\/b> Type 3 Summary LSA<\/span><\/li>\n
    2. <\/b> Type 2 Network LSA<\/span><\/li>\n
    3. <\/b> Type 5 External LSA<\/span><\/li>\n
    4. <\/b> Type 7 NSSA LSA<\/span><\/li>\n<\/ol>\n

      Correct Answer: 2. Type 2 Network LSA<\/b><\/p>\n

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

      On a broadcast or other multi-access network where a DR is elected, the Designated Router originates a Type 2 Network LSA. This LSA represents the shared network and lists the routers attached to it. It helps OSPF model the multi-access segment efficiently in the link-state database. Type 3 LSAs are generated by ABRs for inter-area routes, Type 5 LSAs advertise external routes, and Type 7 LSAs are used for external routing information inside an NSSA.<\/span><\/p>\n

      Question 103.<\/b><\/p>\n

      Which OSPF state indicates that routers are exchanging Database Description packets?<\/b><\/p>\n

        \n
      1. <\/b> Down<\/span><\/li>\n
      2. <\/b> Init<\/span><\/li>\n
      3. <\/b> Exchange<\/span><\/li>\n
      4. <\/b> Full<\/span><\/li>\n<\/ol>\n

        Correct Answer: 3. Exchange<\/b><\/p>\n

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

        During the Exchange state, OSPF neighbors exchange Database Description packets that summarize the contents of their link-state databases. Each router compares the received summaries with its own database and identifies information that must be requested. Earlier states include Down, Init, and ExStart, while Loading follows Exchange as routers request missing LSAs. Full indicates that the neighbors have completed synchronization. Understanding these states is useful when diagnosing why an expected adjacency is not progressing normally.<\/span><\/p>\n

        Question 104.<\/b><\/p>\n

        What is the function of the OSPF Dead timer?<\/b><\/p>\n

          \n
        1. <\/b> Determine BGP path preference<\/span><\/li>\n
        2. <\/b> Set MPLS label lifetime<\/span><\/li>\n
        3. <\/b> Select the spanning-tree root<\/span><\/li>\n
        4. <\/b> Determine how long a router waits without receiving Hellos before declaring a neighbor down**<\/span><\/li>\n<\/ol>\n

          Correct Answer: 4. Determine how long a router waits without receiving Hellos before declaring a neighbor down<\/b><\/p>\n

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

          The OSPF Dead timer defines how long a router can go without receiving a Hello packet from a neighbor before declaring that neighbor unavailable. Neighboring routers typically need compatible Hello and Dead timer settings for adjacency formation. Shorter timers can improve failure detection but also increase control-plane activity and may make the network more sensitive to transient packet loss. BFD is often used when very fast failure detection is needed without aggressively reducing normal OSPF timers.<\/span><\/p>\n

          Question 105.<\/b><\/p>\n

          What is the main purpose of OSPF authentication on a routing interface?<\/b><\/p>\n

            \n
          1. <\/b> Reduce the risk of unauthorized routers participating in OSPF exchanges<\/span><\/li>\n
          2. <\/b> Increase interface bandwidth<\/span><\/li>\n
          3. <\/b> Create an MPLS tunnel<\/span><\/li>\n
          4. <\/b> Assign a public IP address<\/span><\/li>\n<\/ol>\n

            Correct Answer: 1. Reduce the risk of unauthorized routers participating in OSPF exchanges<\/b><\/p>\n

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

            OSPF authentication verifies that protocol packets come from routers using the expected authentication configuration. This helps prevent unauthorized or accidentally misconfigured devices from successfully joining the OSPF routing domain and exchanging routing information. Both sides of the adjacency must use compatible authentication settings. Authentication should be combined with secure management, infrastructure filtering, and appropriate network segmentation. It does not encrypt normal application data or increase interface capacity.<\/span><\/p>\n

            Question 106.<\/b><\/p>\n

            A BGP route is learned from a peer but is not selected because its Next_Hop is unreachable. What should the administrator do?<\/b><\/p>\n

              \n
            1. <\/b> Change the STP root bridge<\/span><\/li>\n
            2. <\/b> Provide routing reachability to the BGP Next_Hop<\/span><\/li>\n
            3. <\/b> Disable BGP loop prevention<\/span><\/li>\n
            4. <\/b> Change the DHCP lease time<\/span><\/li>\n<\/ol>\n

              Correct Answer: 2. Provide routing reachability to the BGP Next_Hop<\/b><\/p>\n

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

              A BGP route normally requires the Next_Hop address to be resolvable before it can be used for forwarding. The administrator should ensure that an IGP, connected route, or static route provides reachability to that address. In many iBGP designs, loopback addresses are used for peering, so the IGP must carry routes to those loopbacks. Adjusting unrelated Layer 2 or DHCP settings will not make an unreachable BGP next hop usable.<\/span><\/p>\n

              Question 107.<\/b><\/p>\n

              Which BGP mechanism is commonly used to apply different routing policies to groups of routes?<\/b><\/p>\n

                \n
              1. <\/b> STP instances<\/span><\/li>\n
              2. <\/b> DHCP options<\/span><\/li>\n
              3. <\/b> BGP communities<\/span><\/li>\n
              4. <\/b> Ethernet flow control<\/span><\/li>\n<\/ol>\n

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

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

                BGP communities act as route tags that can be matched by routing policies. Administrators can assign a community to a set of prefixes and then apply consistent actions, such as modifying Local Preference, controlling advertisement, or selecting which peers receive those routes. This is more scalable than creating separate rules for every individual prefix. Communities are widely used in enterprise and service-provider routing policy. They do not perform Layer 2 loop prevention or host configuration.<\/span><\/p>\n

                Question 108.<\/b><\/p>\n

                What is the purpose of the MED attribute in BGP?<\/b><\/p>\n

                  \n
                1. <\/b> Identify the OSPF area<\/span><\/li>\n
                2. <\/b> Encrypt BGP sessions<\/span><\/li>\n
                3. <\/b> Replace the AS_Path<\/span><\/li>\n
                4. <\/b> Suggest a preferred entry point into an autonomous system**<\/span><\/li>\n<\/ol>\n

                  Correct Answer: 4. Suggest a preferred entry point into an autonomous system<\/b><\/p>\n

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

                  The Multi-Exit Discriminator can be advertised to a neighboring autonomous system to indicate which link the advertising AS would prefer that neighbor to use when sending traffic inward. Lower MED values are normally preferred when the attribute is compared. MED is most predictable when evaluating multiple paths learned from the same neighboring AS, though policy behavior can vary. It is a traffic-engineering attribute and does not replace the AS_Path or provide session encryption.<\/span><\/p>\n

                  Question 109.<\/b><\/p>\n

                  What is the main purpose of the AS_Path attribute during BGP route selection and loop prevention?<\/b><\/p>\n

                    \n
                  1. <\/b> Record the autonomous systems traversed by the route<\/span><\/li>\n
                  2. <\/b> Identify the Ethernet VLAN<\/span><\/li>\n
                  3. <\/b> Specify the DHCP server<\/span><\/li>\n
                  4. <\/b> Select the OSPF DR<\/span><\/li>\n<\/ol>\n

                    Correct Answer: 1. Record the autonomous systems traversed by the route<\/b><\/p>\n

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

                    AS_Path records the sequence of autonomous systems a BGP route has traversed. A router normally rejects a route if its own AS number appears in the path, preventing inter-AS routing loops. AS_Path length is also used in best-path selection, with a shorter path generally preferred when earlier attributes are equal. Administrators can manipulate AS_Path through prepending to influence inbound traffic, though external policies may affect the result.<\/span><\/p>\n

                    Question 110.<\/b><\/p>\n

                    Why is route filtering important on an eBGP connection to an external organization?<\/b><\/p>\n

                      \n
                    1. <\/b> It replaces authentication<\/span><\/li>\n
                    2. <\/b> It prevents unintended prefixes from being accepted or advertised<\/span><\/li>\n
                    3. <\/b> It disables route convergence<\/span><\/li>\n
                    4. <\/b> It automatically creates MPLS VPNs<\/span><\/li>\n<\/ol>\n

                      Correct Answer: 2. It prevents unintended prefixes from being accepted or advertised<\/b><\/p>\n

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

                      BGP route filtering helps ensure that only authorized and expected prefixes are exchanged with external peers. Without proper filtering, a configuration error could cause a network to advertise routes it does not own or accept routes it should not trust. Prefix lists and routing policies are commonly used to define what is permitted. This improves routing security and predictability. Filtering does not replace session authentication or other operational controls, but it is a critical part of safe eBGP design.<\/span><\/p>\n

                      Question 111.<\/b><\/p>\n

                      In IS-IS, what does a Level-1 router normally do when sending traffic to a destination outside its own area?<\/b><\/p>\n

                        \n
                      1. <\/b> Forward the traffic toward an appropriate Level-1-2 router<\/span><\/li>\n
                      2. <\/b> Drop all inter-area traffic<\/span><\/li>\n
                      3. <\/b> Establish a BGP session automatically<\/span><\/li>\n
                      4. <\/b> Send the traffic to the IS-IS DIS only<\/span><\/li>\n<\/ol>\n

                        Correct Answer: 1. Forward the traffic toward an appropriate Level-1-2 router<\/b><\/p>\n

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

                        A Level-1 IS-IS router has detailed topology information about its own area. For destinations outside the area, it normally relies on a Level-1-2 router that provides connectivity toward the Level-2 backbone. This allows IS-IS to maintain a scalable hierarchy in which Level-1 routers do not need full knowledge of every remote area’s topology. The DIS is a broadcast-network function and is not simply the default destination for inter-area traffic.<\/span><\/p>\n

                        Question 112.<\/b><\/p>\n

                        What is the role of a Level-2-only IS-IS router?<\/b><\/p>\n

                          \n
                        1. <\/b> Operate exclusively as a host default gateway<\/span><\/li>\n
                        2. <\/b> Participate in inter-area routing within the IS-IS Level-2 domain<\/span><\/li>\n
                        3. <\/b> Create Layer 2 VLANs<\/span><\/li>\n
                        4. <\/b> Provide DHCP relay only<\/span><\/li>\n<\/ol>\n

                          Correct Answer: 2. Participate in inter-area routing within the IS-IS Level-2 domain<\/b><\/p>\n

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

                          Level-2 IS-IS routers participate in the backbone-like portion of the IS-IS domain and exchange routing information used for inter-area connectivity. They do not maintain Level-1 topology information for an ordinary local area unless they are configured as Level-1-2 routers. Level-2 provides the scalable backbone that connects multiple IS-IS areas. VLAN and DHCP functions are separate from IS-IS routing levels.<\/span><\/p>\n

                          Question 113.<\/b><\/p>\n

                          What is the purpose of LDP neighbor relationships in an MPLS network?<\/b><\/p>\n

                            \n
                          1. <\/b> Exchange label-mapping information between MPLS-capable routers<\/span><\/li>\n
                          2. <\/b> Assign IPv6 addresses to hosts<\/span><\/li>\n
                          3. <\/b> Replace OSPF and IS-IS topology calculation<\/span><\/li>\n
                          4. <\/b> Elect an STP root bridge<\/span><\/li>\n<\/ol>\n

                            Correct Answer: 1. Exchange label-mapping information between MPLS-capable routers<\/b><\/p>\n

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

                            LDP establishes relationships between MPLS-capable routers so they can advertise label bindings for forwarding equivalence classes. These bindings are then used to build label forwarding information and support label-switched paths. The IGP still calculates IP reachability, while LDP distributes label information associated with those routes. LDP therefore works alongside routing protocols rather than replacing them. It is unrelated to IPv6 host addressing or spanning-tree operation.<\/span><\/p>\n

                            Question 114.<\/b><\/p>\n

                            What is the purpose of the MPLS label stack?<\/b><\/p>\n

                              \n
                            1. <\/b> Store several Ethernet VLAN IDs<\/span><\/li>\n
                            2. <\/b> Allow multiple labels to represent transport and service information<\/span><\/li>\n
                            3. <\/b> Encrypt packet payloads<\/span><\/li>\n
                            4. <\/b> Replace the IP header permanently<\/span><\/li>\n<\/ol>\n

                              Correct Answer: 2. Allow multiple labels to represent transport and service information<\/b><\/p>\n

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

                              MPLS packets can carry more than one label. In services such as MPLS Layer 3 VPNs, an outer label can be used to transport the packet across the provider network, while an inner label identifies the VPN or service context at the destination PE router. Labels are processed as a stack, with routers generally examining the top label first. This layered forwarding model supports scalable transport and service separation without requiring core routers to understand all customer routing information.<\/span><\/p>\n

                              Question 115.<\/b><\/p>\n

                              What is the purpose of MP-BGP in an MPLS Layer 3 VPN?<\/b><\/p>\n

                                \n
                              1. <\/b> Distribute VPN routing information between PE routers<\/span><\/li>\n
                              2. <\/b> Replace LACP<\/span><\/li>\n
                              3. <\/b> Elect a VRRP master<\/span><\/li>\n
                              4. <\/b> Provide Layer 2 loop prevention<\/span><\/li>\n<\/ol>\n

                                Correct Answer: 1. Distribute VPN routing information between PE routers<\/b><\/p>\n

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

                                MP-BGP extends BGP to support additional address families, including VPN route information used in MPLS Layer 3 VPN services. PE routers use MP-BGP to exchange customer VPN prefixes while preserving separation with attributes such as Route Distinguishers and Route Targets. The MPLS forwarding plane then carries customer traffic across the provider backbone. MP-BGP is therefore a key VPN control-plane component rather than a Layer 2 or first-hop redundancy technology.<\/span><\/p>\n

                                Question 116.<\/b><\/p>\n

                                In a VRRP group, what normally determines which router becomes master when priorities differ?<\/b><\/p>\n

                                  \n
                                1. <\/b> The router with the lowest priority<\/span><\/li>\n
                                2. <\/b> The router with the highest effective VRRP priority<\/span><\/li>\n
                                3. <\/b> The router with the highest OSPF cost<\/span><\/li>\n
                                4. <\/b> The router with the longest uptime only<\/span><\/li>\n<\/ol>\n

                                  Correct Answer: 2. The router with the highest effective VRRP priority<\/b><\/p>\n

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

                                  VRRP uses priority to determine which participating router should act as master for the virtual gateway. A higher effective priority is generally preferred. If the preferred router fails, a backup can assume the master role and continue forwarding traffic for the virtual IP address. When preemption is enabled, a higher-priority router may reclaim the master role after recovery. VRRP election is independent of OSPF cost and is designed specifically for first-hop gateway redundancy.<\/span><\/p>\n

                                  Question 117.<\/b><\/p>\n

                                  What is the main benefit of tracking an uplink with VRRP where supported?<\/b><\/p>\n

                                    \n
                                  1. <\/b> The router can reduce its VRRP priority when upstream connectivity fails<\/span><\/li>\n
                                  2. <\/b> It increases Ethernet frame size<\/span><\/li>\n
                                  3. <\/b> It disables the virtual IP address permanently<\/span><\/li>\n
                                  4. <\/b> It creates an MPLS tunnel automatically<\/span><\/li>\n<\/ol>\n

                                    Correct Answer: 1. The router can reduce its VRRP priority when upstream connectivity fails<\/b><\/p>\n

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

                                    A router may still have a functioning LAN interface even when its upstream path has failed. If it remains VRRP master, hosts could continue sending traffic to a gateway that cannot reach external destinations. Interface or route tracking can reduce the router’s effective priority when an important upstream resource fails, allowing a healthier backup device to become master. This makes gateway redundancy more meaningful by considering end-to-end connectivity rather than only local interface status.<\/span><\/p>\n

                                    Question 118.<\/b><\/p>\n

                                    What is the main purpose of QoS congestion management?<\/b><\/p>\n

                                      \n
                                    1. <\/b> Change BGP AS numbers<\/span><\/li>\n
                                    2. <\/b> Decide how queued traffic is scheduled when an interface is congested<\/span><\/li>\n
                                    3. <\/b> Assign IPv6 prefixes<\/span><\/li>\n
                                    4. <\/b> Create IS-IS areas<\/span><\/li>\n<\/ol>\n

                                      Correct Answer: 2. Decide how queued traffic is scheduled when an interface is congested<\/b><\/p>\n

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

                                      Congestion management determines how packets waiting for transmission are organized and selected when available bandwidth is insufficient for all traffic immediately. Different queues and scheduling methods can provide preferential treatment to delay-sensitive or business-critical applications. Classification and marking typically occur earlier so packets can be placed into appropriate queues. Congestion management does not create additional physical bandwidth but helps allocate existing capacity according to policy during periods of contention.<\/span><\/p>\n

                                      Question 119.<\/b><\/p>\n

                                      What is the role of congestion avoidance in QoS?<\/b><\/p>\n

                                        \n
                                      1. <\/b> Proactively manage queue buildup, often by dropping selected packets before a queue becomes completely full<\/span><\/li>\n
                                      2. <\/b> Replace routing protocols<\/span><\/li>\n
                                      3. <\/b> Create Ethernet trunks<\/span><\/li>\n
                                      4. <\/b> Establish BGP sessions<\/span><\/li>\n<\/ol>\n

                                        Correct Answer: 1. Proactively manage queue buildup, often by dropping selected packets before a queue becomes completely full<\/b><\/p>\n

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

                                        Congestion avoidance mechanisms attempt to prevent queues from reaching a fully congested state. Instead of waiting for the queue to fill and then dropping all additional packets, the system can begin selectively dropping traffic earlier according to configured behavior. This can signal certain transport protocols to reduce their sending rate and may improve overall network stability. Congestion avoidance complements queue scheduling and other QoS mechanisms but does not replace routing or link aggregation.<\/span><\/p>\n

                                        Question 120.<\/b><\/p>\n

                                        Which approach BEST supports stable operation in a network that uses OSPF, IS-IS, BGP, MPLS, VRRP, and QoS?<\/b><\/p>\n

                                          \n
                                        1. <\/b> Use uncontrolled redistribution and identical policies everywhere<\/span><\/li>\n
                                        2. <\/b> Build one large Layer 2 domain<\/span><\/li>\n
                                        3. <\/b> Disable redundancy to reduce configuration<\/span><\/li>\n
                                        4. <\/b> Define clear protocol roles, routing policies, redundancy, fast failure detection, monitoring, and consistent traffic treatment**<\/span><\/li>\n<\/ol>\n

                                          Correct Answer: 4. Define clear protocol roles, routing policies, redundancy, fast failure detection, monitoring, and consistent traffic treatment<\/b><\/p>\n

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

                                          Complex networks are most reliable when each technology has a clearly defined purpose. OSPF or IS-IS can provide internal reachability, BGP can control inter-domain or service routing, MPLS can provide scalable transport and VPN services, and VRRP can protect default gateways. QoS should use consistent classification and scheduling policies, while BFD and redundant infrastructure can improve convergence and availability. Clear protocol boundaries, filtering, summarization, and monitoring reduce operational complexity and help prevent routing loops or unexpected traffic behavior.<\/span><\/p>\n

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

                                          View Full Huawei H12-831 Exam Dumps and Practice Test Dumps   Question 101. In OSPF, what is the main purpose of a Type 1 Router LSA? Describe a router’s links and costs within an OSPF area Advertise external BGP routes Carry MPLS labels Identify DHCP servers Correct Answer: 1. Describe a router’s links and costs […]<\/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\/19888"}],"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=19888"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/19888\/revisions"}],"predecessor-version":[{"id":19889,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/19888\/revisions\/19889"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=19888"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=19888"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=19888"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}