{"id":20790,"date":"2026-09-24T07:33:49","date_gmt":"2026-09-24T07:33:49","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=20790"},"modified":"2026-09-24T07:33:49","modified_gmt":"2026-09-24T07:33:49","slug":"juniper-jn0-637-practice-test-questions-and-exam-dumps-part-9-q161-180","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/juniper-jn0-637-practice-test-questions-and-exam-dumps-part-9-q161-180\/","title":{"rendered":"Juniper JN0-637 Practice Test Questions and Exam Dumps Part 9 Q161-180"},"content":{"rendered":"

View Full <\/b>Juniper JN0-637 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/h2>\n

 <\/p>\n

Question 161: Which BGP attribute is used to indicate the IP address of the next router toward a destination?<\/b><\/p>\n

    \n
  1. <\/b> MED<\/span><\/li>\n
  2. <\/b> Origin<\/span><\/li>\n
  3. <\/b> Next hop<\/span><\/li>\n
  4. <\/b> Local preference<\/span><\/li>\n<\/ol>\n

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

    Explanation:<\/b>
    \n<\/b>The BGP next-hop attribute identifies the IP address of the router that should be used as the next hop toward a BGP destination. For a route to be usable, the next hop generally must be reachable through the local routing table. BGP can modify the next-hop value through routing policy or configuration when required by the network design. The next-hop attribute is different from local preference, MED, and origin, which influence route selection in different ways. Troubleshooting BGP connectivity often involves checking both whether the route has been received and whether the advertised next hop is reachable from the local device.<\/span><\/p>\n

    Question 162: Which Junos command displays the configured routing protocols and their configuration hierarchy?<\/b><\/p>\n

      \n
    1. <\/b> show configuration protocols<\/span><\/li>\n
    2. <\/b> show route<\/span><\/li>\n
    3. <\/b> show interfaces terse<\/span><\/li>\n
    4. <\/b> show chassis hardware<\/span><\/li>\n<\/ol>\n

      Correct Answer: 1. <\/b>show configuration protocols<\/b><\/p>\n

      Explanation:<\/b>
      \n<\/b>The Junos <\/span>show configuration protocols<\/span> command displays the configuration under the protocols hierarchy. This can include protocols such as BGP, OSPF, IS-IS, LDP, and other protocol-related configuration depending on the device. It is useful when reviewing how routing protocols have been configured and when troubleshooting unexpected protocol behavior. The command shows configuration rather than the current operational state of routing tables or interfaces. Operational commands such as <\/span>show route<\/span> and protocol-specific monitoring commands can be used alongside it to determine how the configured settings are affecting actual network behavior.<\/span><\/p>\n

      Question 163: Which MPLS device typically performs label switching in the core of an MPLS network?<\/b><\/p>\n

        \n
      1. <\/b> Route Reflector<\/span><\/li>\n
      2. <\/b> Provider Edge Router<\/span><\/li>\n
      3. <\/b> Label Edge Router<\/span><\/li>\n
      4. <\/b> Label-Switched Router<\/span><\/li>\n<\/ol>\n

        Correct Answer: 4. Label-Switched Router<\/b><\/p>\n

        Explanation:<\/b>
        \n<\/b>A Label-Switched Router (LSR) typically performs MPLS label operations within the provider core. An LSR receives a packet with an incoming label, consults its label forwarding information, and commonly swaps that label for an outgoing label before forwarding the packet. Label Edge Routers operate at the boundary of the MPLS domain and can impose or remove labels. Provider Edge routers provide customer-facing VPN or service connectivity and may also perform edge label operations. Route reflectors are BGP control-plane devices and do not perform the core MPLS label-switching function.<\/span><\/p>\n

        Question 164: Which OSPF area is the backbone area?<\/b><\/p>\n

          \n
        1. <\/b> Area 1<\/span><\/li>\n
        2. <\/b> Area 0<\/span><\/li>\n
        3. <\/b> Area 10<\/span><\/li>\n
        4. <\/b> Area 100<\/span><\/li>\n<\/ol>\n

          Correct Answer: 2. Area 0<\/b><\/p>\n

          Explanation:<\/b>
          \n<\/b>OSPF Area 0 is the backbone area and provides the central interconnection point for other OSPF areas in a hierarchical OSPF design. Inter-area routing normally passes through the backbone, and Area Border Routers connect non-backbone areas to it. Proper backbone connectivity is therefore important for communication between different OSPF areas. Although an OSPF deployment can contain many numbered areas, Area 0 has a special role in the architecture. When troubleshooting inter-area routing, administrators should verify that the relevant areas have appropriate connectivity to the backbone and that ABRs are operating correctly.<\/span><\/p>\n

          Question 165: Which BGP attribute is commonly used to influence inbound traffic by suggesting a preferred entry point into an AS?<\/b><\/p>\n

            \n
          1. <\/b> Local preference<\/span><\/li>\n
          2. <\/b> AS path<\/span><\/li>\n
          3. <\/b> MED<\/span><\/li>\n
          4. <\/b> Origin<\/span><\/li>\n<\/ol>\n

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

            Explanation:<\/b>
            \n<\/b>The Multi-Exit Discriminator (MED) can be used to influence how a neighboring autonomous system selects an entry point when multiple connections exist between the two autonomous systems. A lower MED is generally preferred during the applicable BGP comparison. MED is therefore commonly associated with influencing inbound traffic toward an autonomous system. Local preference has a different purpose because it influences outbound path selection within the local AS. AS path length and origin are also BGP path-selection attributes, but they do not serve the same primary traffic-engineering role as MED in this context.<\/span><\/p>\n

            Question 166: Which Junos command displays the OSPF link-state database?<\/b><\/p>\n

              \n
            1. <\/b> show ospf database<\/span><\/li>\n
            2. <\/b> show bgp summary<\/span><\/li>\n
            3. <\/b> show route forwarding-table<\/span><\/li>\n
            4. <\/b> show ldp neighbor<\/span><\/li>\n<\/ol>\n

              Correct Answer: 1. <\/b>show ospf database<\/b><\/p>\n

              Explanation:<\/b>
              \n<\/b>The Junos <\/span>show ospf database<\/span> command displays the OSPF link-state database maintained by the device. The database contains LSAs describing network topology and reachability information. Reviewing it can help administrators understand what information OSPF has learned and identify missing or unexpected LSAs. This is useful when troubleshooting adjacency, route calculation, or inter-area problems. <\/span>show ospf neighbor<\/span> focuses on neighbor relationships, while the other listed commands examine BGP, forwarding-table, or LDP information. The OSPF database is an important source of information when determining why a particular route is or is not being calculated.<\/span><\/p>\n

              Question 167: What is the primary purpose of an OSPF Designated Router on a broadcast network?<\/b><\/p>\n

                \n
              1. <\/b> To assign IP addresses<\/span><\/li>\n
              2. <\/b> To reduce the number of OSPF adjacencies required<\/span><\/li>\n
              3. <\/b> To distribute MPLS labels<\/span><\/li>\n
              4. <\/b> To select the BGP best path<\/span><\/li>\n<\/ol>\n

                Correct Answer: 2. To reduce the number of OSPF adjacencies required<\/b><\/p>\n

                Explanation:<\/b>
                \n<\/b>On broadcast multiaccess networks, OSPF elects a Designated Router (DR) to reduce the number of full OSPF adjacencies that would otherwise be required between every pair of routers. The DR represents the shared network and helps coordinate the exchange of link-state information. A Backup Designated Router (BDR) is also elected to provide continuity if the DR fails. This design improves scalability on multiaccess segments. DR election is an OSPF function and is unrelated to MPLS label distribution or BGP best-path selection. Troubleshooting DR behavior can involve checking OSPF priority, interface state, and adjacency information.<\/span><\/p>\n

                Question 168: Which Junos command can be used to display information about LDP neighbors?<\/b><\/p>\n

                  \n
                1. <\/b> show ospf neighbor<\/span><\/li>\n
                2. <\/b> show bgp summary<\/span><\/li>\n
                3. <\/b> show route<\/span><\/li>\n
                4. <\/b> show ldp neighbor<\/span><\/li>\n<\/ol>\n

                  Correct Answer: 4. <\/b>show ldp neighbor<\/b><\/p>\n

                  Explanation:<\/b>
                  \n<\/b>The Junos <\/span>show ldp neighbor<\/span> command displays information about Label Distribution Protocol neighbors. LDP is used in many MPLS environments to distribute labels associated with routes and establish label-switched forwarding paths. Examining LDP neighbors can help verify whether expected label-distribution relationships are established between routers. If an LDP session is missing, administrators may need to investigate interface configuration, addressing, protocol configuration, reachability, and related MPLS settings. The other commands focus on OSPF, BGP, or general routing information rather than LDP neighbor relationships.<\/span><\/p>\n

                  Question 169: Which Junos feature allows an administrator to verify a configuration before committing it?<\/b><\/p>\n

                    \n
                  1. <\/b> commit check<\/span><\/li>\n
                  2. <\/b> commit confirmed<\/span><\/li>\n
                  3. <\/b> rollback<\/span><\/li>\n
                  4. <\/b> show route<\/span><\/li>\n<\/ol>\n

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

                    Explanation:<\/b>
                    \n<\/b>The Junos <\/span>commit check<\/span> command checks the candidate configuration for syntax and configuration consistency without activating the changes. It is useful before committing a configuration because it can identify errors that would prevent a successful commit. This provides an opportunity to correct problems while the changes remain in the candidate configuration. <\/span>commit confirmed<\/span> serves a different purpose by temporarily committing changes and requiring confirmation, while <\/span>rollback<\/span> loads a previous configuration version. Using <\/span>commit check<\/span> as part of a configuration workflow can reduce the risk of committing invalid or incomplete configuration statements.<\/span><\/p>\n

                    Question 170: Which BGP relationship is formed between routers located in different autonomous systems?<\/b><\/p>\n

                      \n
                    1. <\/b> iBGP<\/span><\/li>\n
                    2. <\/b> OSPF<\/span><\/li>\n
                    3. <\/b> IS-IS<\/span><\/li>\n
                    4. <\/b> eBGP<\/span><\/li>\n<\/ol>\n

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

                      Explanation:<\/b>
                      \n<\/b>External BGP (eBGP) is used to exchange routing information between BGP speakers belonging to different autonomous systems. Each AS is identified by its autonomous system number, and the AS path attribute records the autonomous systems through which advertised routes pass. In contrast, iBGP is used between BGP speakers within the same autonomous system. OSPF and IS-IS are interior gateway protocols rather than BGP session types. Understanding whether a BGP relationship is internal or external is important because the two types have different routing behavior, next-hop handling, and design considerations.<\/span><\/p>\n

                      Question 171: What does a Junos routing policy’s <\/b>then<\/b> section define?<\/b><\/p>\n

                        \n
                      1. <\/b> The route’s physical interface<\/span><\/li>\n
                      2. <\/b> The conditions that must match<\/span><\/li>\n
                      3. <\/b> The actions applied when the policy term matches<\/span><\/li>\n
                      4. <\/b> The BGP session password<\/span><\/li>\n<\/ol>\n

                        Correct Answer: 3. The actions applied when the policy term matches<\/b><\/p>\n

                        Explanation:<\/b>
                        \n<\/b>In a Junos routing policy, the <\/span>then<\/span> section defines what actions should be taken when a policy term matches a route. Actions can include accepting or rejecting the route, modifying BGP attributes, adding or removing communities, changing preferences, or performing other supported policy operations. The <\/span>from<\/span> section defines the match conditions that determine whether a route qualifies for the term. Separating matching criteria from actions makes Junos routing policies flexible and structured. When troubleshooting route import or export behavior, examining both the <\/span>from<\/span> and <\/span>then<\/span> portions is important to understand why a route was accepted, rejected, or modified.<\/span><\/p>\n

                        Question 172: Which protocol is commonly used for dynamic routing of IPv6 prefixes using a link-state approach?<\/b><\/p>\n

                          \n
                        1. <\/b> OSPFv3<\/span><\/li>\n
                        2. <\/b> FTP<\/span><\/li>\n
                        3. <\/b> LACP<\/span><\/li>\n
                        4. <\/b> ARP<\/span><\/li>\n<\/ol>\n

                          Correct Answer: 1. OSPFv3<\/b><\/p>\n

                          Explanation:<\/b>
                          \n<\/b>OSPFv3 is a link-state routing protocol designed to provide OSPF routing functionality for IPv6 networks. It allows routers to establish adjacencies, exchange link-state information, build a link-state database, and calculate shortest paths. IPv6 uses Neighbor Discovery rather than ARP for local neighbor resolution, while LACP handles Ethernet link aggregation. FTP is an application-layer file-transfer protocol and is unrelated to routing. OSPFv3 is therefore appropriate when a Junos network requires dynamic link-state routing for IPv6 destinations. When troubleshooting OSPFv3, administrators can examine neighbors, database information, interfaces, and route installation.<\/span><\/p>\n

                          Question 173: Which Junos command provides a concise summary of interface administrative and operational states?<\/b><\/p>\n

                            \n
                          1. <\/b> show interfaces terse<\/span><\/li>\n
                          2. <\/b> show route<\/span><\/li>\n
                          3. <\/b> show chassis hardware<\/span><\/li>\n
                          4. <\/b> show configuration<\/span><\/li>\n<\/ol>\n

                            Correct Answer: 4. <\/b>show interfaces terse<\/b><\/p>\n

                            Explanation:<\/b>
                            \n<\/b>The Junos <\/span>show interfaces terse<\/span> command provides a concise summary of interface information, including administrative and operational states and configured logical units. It is useful for quickly identifying interfaces that are administratively disabled or operationally down. Administrators can use the detailed <\/span>show interfaces<\/span> command when additional statistics, errors, or operational information are required. <\/span>show route<\/span> examines routing information, while <\/span>show chassis hardware<\/span> displays hardware components and <\/span>show configuration<\/span> displays configuration statements. The terse interface command is therefore commonly used as an initial check when troubleshooting physical or logical connectivity.<\/span><\/p>\n

                            Question 174: Which BGP attribute is generally preferred when it has a shorter value representing fewer autonomous-system hops?<\/b><\/p>\n

                              \n
                            1. <\/b> MED<\/span><\/li>\n
                            2. <\/b> AS path<\/span><\/li>\n
                            3. <\/b> Local preference<\/span><\/li>\n
                            4. <\/b> Community<\/span><\/li>\n<\/ol>\n

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

                              Explanation:<\/b>
                              \n<\/b>The AS path attribute contains the sequence of autonomous systems through which a BGP route has traveled. When BGP compares routes at the AS-path stage of the decision process, the route with the shorter AS path is generally preferred. The AS path also provides an important loop-prevention mechanism because a router can reject routes containing its own AS number. Local preference, MED, and communities have different purposes and comparison rules. A shorter AS path does not automatically guarantee that a route will be selected, because higher-priority BGP attributes and other decision criteria can determine the final best path.<\/span><\/p>\n

                              Question 175: Which Junos command can be used to examine the routes advertised to a specific BGP peer?<\/b><\/p>\n

                                \n
                              1. <\/b> show route advertising-protocol bgp <peer><\/span><\/li>\n
                              2. <\/b> show route receive-protocol bgp <peer><\/span><\/li>\n
                              3. <\/b> show ospf neighbor<\/span><\/li>\n
                              4. <\/b> show ldp neighbor<\/span><\/li>\n<\/ol>\n

                                Correct Answer: 1. <\/b>show route advertising-protocol bgp <peer><\/b><\/p>\n

                                Explanation:<\/b>
                                \n<\/b>The Junos <\/span>show route advertising-protocol bgp <peer><\/span> command displays routes that the local device is advertising to a specified BGP peer. It is useful for troubleshooting outbound route advertisement and determining whether routing policies are allowing the expected prefixes to be sent. This command complements <\/span>show route receive-protocol bgp <peer><\/span>, which examines routes received from a peer. If a remote network is missing a prefix, checking the local advertising output can help determine whether the route is being exported as expected. Policy configuration, route availability, and BGP session state may then be examined if the expected route is absent.<\/span><\/p>\n

                                Question 176: Which technology is used to provide neighbor discovery information at Layer 2?<\/b><\/p>\n

                                  \n
                                1. <\/b> BGP<\/span><\/li>\n
                                2. <\/b> LLDP<\/span><\/li>\n
                                3. <\/b> OSPF<\/span><\/li>\n
                                4. <\/b> LDP<\/span><\/li>\n<\/ol>\n

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

                                  Explanation:<\/b>
                                  \n<\/b>Link Layer Discovery Protocol (LLDP) is used to exchange identification and capability information between directly connected devices at Layer 2. Network administrators can use LLDP information to determine which neighboring device is connected to a particular interface and to identify remote ports or system information. This can be especially useful when documenting physical topology and troubleshooting cabling or connectivity issues. BGP and OSPF are routing protocols, while LDP distributes MPLS labels. LLDP does not establish IP routing paths; instead, it provides useful information about directly connected Layer 2 neighbors.<\/span><\/p>\n

                                  Question 177: Which Junos component is responsible for packet forwarding based on information programmed into forwarding tables?<\/b><\/p>\n

                                    \n
                                  1. <\/b> Routing Engine<\/span><\/li>\n
                                  2. <\/b> Packet Forwarding Engine<\/span><\/li>\n
                                  3. <\/b> Configuration database<\/span><\/li>\n
                                  4. <\/b> Routing policy<\/span><\/li>\n<\/ol>\n

                                    Correct Answer: 2. Packet Forwarding Engine<\/b><\/p>\n

                                    Explanation:<\/b>
                                    \n<\/b>The Packet Forwarding Engine (PFE) is responsible for forwarding packets using the forwarding information programmed into the device. The Routing Engine runs the control-plane processes and routing protocols and determines routing information that can ultimately be installed into forwarding structures. The PFE then uses those structures to make packet-forwarding decisions. This separation between control-plane and forwarding-plane responsibilities is fundamental to Junos architecture. When troubleshooting, a routing-protocol issue may require examination of the Routing Engine and routing tables, while forwarding problems may require examination of forwarding-table entries, interface state, or PFE-related information.<\/span><\/p>\n

                                    Question 178: Which BGP attribute is normally preferred when its value is lower during the relevant path-selection comparison?<\/b><\/p>\n

                                      \n
                                    1. <\/b> Local preference<\/span><\/li>\n
                                    2. <\/b> AS path length<\/span><\/li>\n
                                    3. <\/b> MED<\/span><\/li>\n
                                    4. <\/b> Community<\/span><\/li>\n<\/ol>\n

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

                                      Explanation:<\/b>
                                      \n<\/b>The Multi-Exit Discriminator (MED) is generally compared so that the lower value is preferred during the applicable BGP decision process. MED is commonly used to suggest an entry point into an autonomous system when multiple links connect the same neighboring autonomous systems. It differs from local preference, where a higher value is generally preferred for outbound path selection within the local AS. MED is an optional attribute and its comparison behavior can depend on configuration and implementation details. Understanding whether an attribute favors a higher or lower value is important when troubleshooting BGP route selection and interpreting routing-policy results.<\/span><\/p>\n

                                      Question 179: Which Junos command can display a summary of the system’s installed hardware components?<\/b><\/p>\n

                                        \n
                                      1. <\/b> show chassis hardware<\/span><\/li>\n
                                      2. <\/b> show route summary<\/span><\/li>\n
                                      3. <\/b> show bgp summary<\/span><\/li>\n
                                      4. <\/b> show interfaces terse<\/span><\/li>\n<\/ol>\n

                                        Correct Answer: 1. <\/b>show chassis hardware<\/b><\/p>\n

                                        Explanation:<\/b>
                                        \n<\/b>The Junos <\/span>show chassis hardware<\/span> command displays information about the hardware components detected by the device. Depending on the platform, the output can include the chassis, Routing Engine, line cards, interface modules, and other hardware components. This command is useful when verifying hardware installation or troubleshooting situations where a component is not recognized as expected. It differs from routing and interface commands, which provide operational information about routes and interfaces. Hardware information can also be useful when documenting a device or confirming that the physical platform matches the expected configuration.<\/span><\/p>\n

                                        Question 180: What is the primary purpose of a firewall filter on a Junos device?<\/b><\/p>\n

                                          \n
                                        1. <\/b> To establish an OSPF adjacency<\/span><\/li>\n
                                        2. <\/b> To distribute MPLS labels<\/span><\/li>\n
                                        3. <\/b> To provide BGP route reflection<\/span><\/li>\n
                                        4. <\/b> To classify or control packets according to configured match conditions and actions<\/span><\/li>\n<\/ol>\n

                                          Correct Answer: 4. To classify or control packets according to configured match conditions and actions<\/b><\/p>\n

                                          Explanation:<\/b>
                                          \n<\/b>A Junos firewall filter can examine packets using configured match conditions and then apply specified actions to matching traffic. Match conditions can include source or destination addresses, protocols, ports, interfaces, and other supported packet characteristics. Actions can include accepting, discarding, counting, logging, or applying other processing. Firewall filters can therefore be used for packet filtering, traffic classification, and control-plane protection depending on where they are applied. They are distinct from routing protocols such as OSPF and BGP and from MPLS label-distribution mechanisms. Properly designed filters can help control traffic while supporting network security and operational requirements.<\/span><\/p>\n

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

                                          View Full Juniper JN0-637 Exam Dumps and Practice Test Dumps   Question 161: Which BGP attribute is used to indicate the IP address of the next router toward a destination? MED Origin Next hop Local preference Correct Answer: 3. Next hop Explanation: The BGP next-hop attribute identifies the IP address of the router that should […]<\/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\/20790"}],"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=20790"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/20790\/revisions"}],"predecessor-version":[{"id":20791,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/20790\/revisions\/20791"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=20790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=20790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=20790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}