{"id":15736,"date":"2026-09-18T06:35:23","date_gmt":"2026-09-18T06:35:23","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=15736"},"modified":"2026-09-18T06:35:23","modified_gmt":"2026-09-18T06:35:23","slug":"juniper-jn0-664-practice-test-questions-and-exam-dumps-part16-q301-320","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/juniper-jn0-664-practice-test-questions-and-exam-dumps-part16-q301-320\/","title":{"rendered":"Juniper JN0-664 Practice Test Questions and Exam Dumps Part16 Q301-320"},"content":{"rendered":"

<\/h1>\n

View Full <\/b>Juniper JN0-664 Exam Dumps<\/b><\/a> and Practice Test Dumps.<\/b><\/h2>\n

 <\/p>\n

Question 301<\/b><\/h2>\n

Which IS-IS bit indicates a router should avoid transit traffic?<\/b><\/p>\n

    \n
  1. Partition bit<\/span><\/li>\n
  2. Attached bit<\/span><\/li>\n
  3. Overload bit<\/span><\/li>\n
  4. Purge flag<\/span><\/li>\n<\/ol>\n

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

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

    The IS-IS overload bit indicates that a router should generally not be selected as a transit router for certain traffic. A router may set this condition when its routing database or resources are not suitable for normal transit forwarding. Other IS-IS information has different purposes, such as identifying attachment to another routing domain or controlling database synchronization. The overload condition is particularly useful during startup or resource-related situations where a router needs time to establish complete routing information. Understanding this bit helps explain why an otherwise reachable IS-IS router may not be selected as an intermediate transit point.<\/span><\/p>\n

    Question 302<\/b><\/h2>\n

    Which IS-IS packet distributes complete database summaries?<\/b><\/p>\n

      \n
    1. CSNP<\/span><\/li>\n
    2. PSNP<\/span><\/li>\n
    3. IIH<\/span><\/li>\n
    4. LSP<\/span><\/li>\n<\/ol>\n

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

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

      A Complete Sequence Number PDU, or CSNP, provides a summary of the link-state information contained in an IS-IS database. CSNPs help routers compare their known database information and identify missing or outdated Link-State PDUs. On broadcast networks, the designated IS-IS router has an important role in transmitting database summaries. PSNPs perform a different function by acknowledging or requesting specific LSP information. IIH packets establish and maintain adjacencies, while LSPs carry actual link-state information. Therefore, CSNP is the packet associated with distributing a complete summary of the IS-IS link-state database.<\/span><\/p>\n

      Question 303<\/b><\/h2>\n

      Which IS-IS packet requests missing link-state information?<\/b><\/p>\n

        \n
      1. CSNP<\/span><\/li>\n
      2. IIH<\/span><\/li>\n
      3. LSP<\/span><\/li>\n
      4. PSNP<\/span><\/li>\n<\/ol>\n

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

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

        A Partial Sequence Number PDU, or PSNP, can be used to request missing IS-IS Link-State PDUs. When a router identifies that information is absent or outdated, a PSNP can identify the required LSP information so that the appropriate update can be obtained. CSNPs provide broader database summaries, while IIH packets are used for establishing and maintaining IS-IS adjacencies. The important distinction is that PSNPs operate on selected pieces of database information rather than presenting a complete database summary. This mechanism contributes to reliable synchronization of IS-IS link-state databases.<\/span><\/p>\n

        Question 304<\/b><\/h2>\n

        Which BGP feature requests updated route advertisements without resetting sessions?<\/b><\/p>\n

          \n
        1. Hold Timer<\/span><\/li>\n
        2. Route Refresh<\/span><\/li>\n
        3. Keepalive Reset<\/span><\/li>\n
        4. Session Restart<\/span><\/li>\n<\/ol>\n

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

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

          BGP Route Refresh allows a router to request that its peer resend routing information without tearing down the established BGP session. This is particularly useful after routing-policy changes because the receiving router can obtain updated advertisements without requiring a manual session reset. Restarting a BGP session can temporarily interrupt route exchange, while timers such as Hold Time and Keepalive govern session maintenance rather than policy-driven route re-advertisement. Route Refresh therefore provides an efficient operational mechanism for obtaining updated routes after policy modifications while maintaining the existing BGP relationship.<\/span><\/p>\n

          Question 305<\/b><\/h2>\n

          Which BGP attribute records route-reflection cluster identifiers?<\/b><\/p>\n

            \n
          1. Community<\/span><\/li>\n
          2. Atomic Aggregate<\/span><\/li>\n
          3. Originator ID<\/span><\/li>\n
          4. Cluster List<\/span><\/li>\n<\/ol>\n

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

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

            The BGP Cluster List attribute records the route-reflector cluster identifiers that a reflected route has traversed. Route reflectors use this information as part of loop-prevention mechanisms within route-reflector environments. When a route is reflected through multiple route reflectors, cluster information can accumulate as it passes through different clusters. Originator ID identifies the original internal BGP router associated with a reflected route, while Community provides policy-related tagging. Atomic Aggregate has a different purpose related to route aggregation. The Cluster List is therefore specifically associated with tracking route-reflector cluster traversal.<\/span><\/p>\n

            Question 306<\/b><\/h2>\n

            Which BGP design divides one autonomous system into sub-autonomous systems?<\/b><\/p>\n

              \n
            1. Add-Path<\/span><\/li>\n
            2. Confederation<\/span><\/li>\n
            3. Route reflection<\/span><\/li>\n
            4. Multipath<\/span><\/li>\n<\/ol>\n

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

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

              A BGP confederation divides a large autonomous system into smaller internal autonomous-system sections to simplify internal BGP scalability. Externally, the confederation can appear as a single autonomous system to neighboring networks. This architecture can reduce the complexity associated with maintaining a very large number of internal BGP relationships. Route reflection provides another scalability technique but uses route reflectors instead of dividing the autonomous system into sub-autonomous systems. Multipath and Add-Path address path utilization and route advertisement behavior. Confederations are therefore specifically associated with structuring one large BGP autonomous system into smaller internal components.<\/span><\/p>\n

              Question 307<\/b><\/h2>\n

              Which BGP capability filters route advertisements using outbound policy information?<\/b><\/p>\n

                \n
              1. Add-Path<\/span><\/li>\n
              2. MP-BGP<\/span><\/li>\n
              3. ORF<\/span><\/li>\n
              4. MED<\/span><\/li>\n<\/ol>\n

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

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

                Outbound Route Filtering, or ORF, allows a BGP speaker to communicate filtering information to its peer so that unnecessary route advertisements can be limited. This can reduce the amount of routing information exchanged between peers when filtering requirements are known in advance. MED influences path selection, MP-BGP supports multiple address families, and Add-Path allows multiple paths to be advertised. ORF therefore focuses specifically on exchanging route-filtering information between BGP peers. Proper use can improve routing efficiency by reducing advertisements that the receiving router would otherwise discard through local policy.<\/span><\/p>\n

                Question 308<\/b><\/h2>\n

                Which OSPF feature prevents adjacency formation with unauthorized peers?<\/b><\/p>\n

                  \n
                1. Redistribution<\/span><\/li>\n
                2. Authentication<\/span><\/li>\n
                3. Aggregation<\/span><\/li>\n
                4. Summarization<\/span><\/li>\n<\/ol>\n

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

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

                  OSPF authentication provides a mechanism for validating OSPF control-plane communication between participating routers. Authentication can help prevent unauthorized devices from successfully forming OSPF relationships and injecting routing information into the routing domain. The exact authentication method depends on the Junos configuration and supported OSPF features. Summarization and aggregation reduce or combine routing information, while redistribution exchanges routes between different routing protocols or sources. Authentication therefore addresses the trust relationship between OSPF neighbors rather than controlling route size or interprotocol route exchange.<\/span><\/p>\n

                  Question 309<\/b><\/h2>\n

                  Which OSPF area type restricts external route advertisements?<\/b><\/p>\n

                    \n
                  1. Backbone area<\/span><\/li>\n
                  2. Standard area<\/span><\/li>\n
                  3. Transit area<\/span><\/li>\n
                  4. Stub area<\/span><\/li>\n<\/ol>\n

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

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

                    An OSPF stub area restricts certain external route information from entering the area. Instead of receiving a full set of external routes, routers within a stub area can use a default route toward an appropriate exit point. This can reduce the size and complexity of routing information maintained inside smaller areas. The backbone area has a central role in OSPF’s hierarchical architecture, while a standard area supports normal external route handling. Stub areas are therefore useful when administrators want to simplify routing information within an area while maintaining connectivity to external destinations.<\/span><\/p>\n

                    Question 310<\/b><\/h2>\n

                    Which OSPF area supports external routes through Type-7 LSAs?<\/b><\/p>\n

                      \n
                    1. NSSA<\/span><\/li>\n
                    2. Transit area<\/span><\/li>\n
                    3. Backbone area<\/span><\/li>\n
                    4. Stub area<\/span><\/li>\n<\/ol>\n

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

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

                      A Not-So-Stubby Area, or NSSA, permits certain external routes to be introduced into the area while retaining restrictions associated with stub-style operation. External routes originated within an NSSA are represented using Type-7 LSAs. These can subsequently be translated when appropriate so that the routes can be propagated beyond the NSSA. This makes NSSA useful when an area needs limited external route injection without becoming a fully unrestricted OSPF area. Understanding Type-7 LSAs is therefore important when distinguishing NSSA behavior from ordinary stub-area behavior.<\/span><\/p>\n

                      Question 311<\/b><\/h2>\n

                      Which IPv6 feature automatically requests delegated network prefixes?<\/b><\/p>\n

                        \n
                      1. Duplicate Address Detection<\/span><\/li>\n
                      2. Neighbor Solicitation<\/span><\/li>\n
                      3. DHCPv6 Prefix Delegation<\/span><\/li>\n
                      4. Router Advertisement<\/span><\/li>\n<\/ol>\n

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

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

                        DHCPv6 Prefix Delegation allows a DHCPv6 client or requesting router to obtain an IPv6 prefix from a delegating server. The delegated prefix can then be divided into smaller prefixes for downstream networks or interfaces. This differs from ordinary IPv6 host address assignment because the purpose is to provide an entire network prefix rather than simply configuring one host address. Router Advertisements provide local IPv6 configuration information, Neighbor Solicitation supports neighbor discovery, and Duplicate Address Detection checks address uniqueness. Prefix Delegation is therefore the mechanism designed for obtaining routable IPv6 prefixes dynamically.<\/span><\/p>\n

                        Question 312<\/b><\/h2>\n

                        Which multicast model sends traffic only to subscribed receivers?<\/b><\/p>\n

                          \n
                        1. Unknown Unicast<\/span><\/li>\n
                        2. Source-Specific Multicast<\/span><\/li>\n
                        3. Anycast Unicast<\/span><\/li>\n
                        4. Broadcast Distribution<\/span><\/li>\n<\/ol>\n

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

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

                          Source-Specific Multicast, or SSM, allows receivers to subscribe to traffic from a specific multicast source rather than simply joining a multicast group without identifying the source. This provides a more explicit source-and-group relationship and can simplify multicast distribution compared with models that require dynamic rendezvous-point behavior. Broadcast sends traffic broadly across a broadcast domain, while unknown unicast forwarding concerns Ethernet switching behavior. Anycast is associated with addressing multiple locations using a shared address rather than multicast delivery. SSM is therefore specifically designed around receivers selecting both the desired multicast source and group.<\/span><\/p>\n

                          Question 313<\/b><\/h2>\n

                          Which multicast protocol distributes source information between PIM domains?<\/b><\/p>\n

                            \n
                          1. PIM-DM<\/span><\/li>\n
                          2. IGMP<\/span><\/li>\n
                          3. MLD<\/span><\/li>\n
                          4. MSDP<\/span><\/li>\n<\/ol>\n

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

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

                            Multicast Source Discovery Protocol, or MSDP, can exchange information about active multicast sources between rendezvous points in different multicast domains. This allows multicast receivers in one domain to learn about sources located in another domain when the appropriate multicast architecture is deployed. MLD handles IPv6 multicast listener membership, while IGMP handles IPv4 listener membership. PIM-DM is a multicast routing mode rather than a protocol designed specifically for exchanging source-discovery information between independent rendezvous points. MSDP therefore has a specialized role in interdomain multicast source discovery.<\/span><\/p>\n

                            Question 314<\/b><\/h2>\n

                            Which multicast architecture uses a shared rendezvous point initially?<\/b><\/p>\n

                              \n
                            1. IGMP Snooping<\/span><\/li>\n
                            2. SSM<\/span><\/li>\n
                            3. PIM Sparse Mode<\/span><\/li>\n
                            4. PIM Dense Mode<\/span><\/li>\n<\/ol>\n

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

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

                              PIM Sparse Mode uses a rendezvous point as part of its traditional shared-tree multicast operation. Multicast receivers and sources initially interact through the shared multicast infrastructure associated with the rendezvous point, after which traffic can transition to more direct source-specific paths depending on network behavior and configuration. PIM Dense Mode follows a different flood-and-prune approach. SSM avoids the traditional rendezvous-point requirement by identifying sources explicitly, while IGMP Snooping operates within Layer 2 switching environments. PIM Sparse Mode is therefore the multicast architecture most directly associated with rendezvous-point-based operation.<\/span><\/p>\n

                              Question 315<\/b><\/h2>\n

                              Which Junos feature measures application reachability using active probes?<\/b><\/p>\n

                                \n
                              1. SNMP<\/span><\/li>\n
                              2. RPM<\/span><\/li>\n
                              3. J-Flow<\/span><\/li>\n
                              4. Syslog<\/span><\/li>\n<\/ol>\n

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

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

                                Real-time Performance Monitoring, or RPM, allows Junos devices to use active probes to measure network performance and reachability. Depending on configuration, probes can evaluate characteristics such as response time, packet loss, and availability toward selected destinations. This information can be useful for monitoring service quality and detecting connectivity degradation. Syslog records system messages, J-Flow provides traffic-flow information, and SNMP supports network-management data collection. RPM therefore differs by actively generating test traffic to evaluate network performance rather than passively recording events or sampled traffic statistics.<\/span><\/p>\n

                                Question 316<\/b><\/h2>\n

                                Which Junos management technology streams operational data continuously?<\/b><\/p>\n

                                  \n
                                1. DHCP<\/span><\/li>\n
                                2. ARP<\/span><\/li>\n
                                3. RADIUS<\/span><\/li>\n
                                4. JTI<\/span><\/li>\n<\/ol>\n

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

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

                                  Juniper Telemetry Interface, or JTI, provides a mechanism for streaming operational and performance information from supported Junos devices. Instead of relying exclusively on periodic polling, streaming telemetry can deliver selected data continuously to an external collector. This can improve visibility into changing network conditions and support automated monitoring systems. RADIUS handles authentication services, DHCP provides address configuration, and ARP resolves IPv4 addresses to Layer 2 identifiers. JTI therefore belongs to the network telemetry and automation area, where continuous operational data can be consumed by external monitoring platforms.<\/span><\/p>\n

                                  Question 317<\/b><\/h2>\n

                                  Which Junos configuration command merges additional statements into candidate configuration?<\/b><\/p>\n

                                    \n
                                  1. load replace<\/span><\/li>\n
                                  2. load override<\/span><\/li>\n
                                  3. load merge<\/span><\/li>\n
                                  4. load factory-default<\/span><\/li>\n<\/ol>\n

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

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

                                    The load merge operation combines configuration statements from an input source with the existing candidate configuration. Existing statements are retained unless the loaded content modifies corresponding configuration elements. This makes merge useful when administrators want to add or modify selected configuration sections without replacing the entire candidate configuration. load override has a much broader replacement effect, while load replace is intended for replacing matching configuration sections according to its behavior. The merge operation is therefore appropriate when additional configuration needs to be incorporated into an existing candidate configuration.<\/span><\/p>\n

                                    Question 318<\/b><\/h2>\n

                                    Which Junos load operation replaces the candidate configuration entirely?<\/b><\/p>\n

                                      \n
                                    1. load patch<\/span><\/li>\n
                                    2. load activate<\/span><\/li>\n
                                    3. load merge<\/span><\/li>\n
                                    4. load override<\/span><\/li>\n<\/ol>\n

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

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

                                      The load override operation replaces the existing candidate configuration with the configuration supplied by the loaded input. Because this can remove configuration that is not present in the new source, administrators should use it carefully and verify the resulting candidate configuration before committing. load merge instead combines supplied statements with existing candidate configuration. The other listed operations do not represent the standard full candidate replacement mechanism. Understanding the distinction between merge and override is important because the wrong loading method can unintentionally remove existing configuration statements.<\/span><\/p>\n

                                      Question 319<\/b><\/h2>\n

                                      Which routing policy action continues evaluation with another policy?<\/b><\/p>\n

                                        \n
                                      1. Reject<\/span><\/li>\n
                                      2. Next policy<\/span><\/li>\n
                                      3. Accept<\/span><\/li>\n
                                      4. Next term<\/span><\/li>\n<\/ol>\n

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

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

                                        The next policy action in Junos routing policy processing allows evaluation to continue with another policy in the configured policy chain. This can be useful when administrators want multiple policies to process a route sequentially rather than ending evaluation immediately after the current policy. Accept and reject determine the disposition of a route, while next term moves processing to another term within the current policy. The distinction between next policy and next term is important when designing complex routing-policy chains where multiple independent policy stages must be evaluated.<\/span><\/p>\n

                                        Question 320<\/b><\/h2>\n

                                        Which route attribute determines administrative preference among protocols?<\/b><\/p>\n

                                          \n
                                        1. MED<\/span><\/li>\n
                                        2. Cluster List<\/span><\/li>\n
                                        3. Route preference<\/span><\/li>\n
                                        4. AS Path<\/span><\/li>\n<\/ol>\n

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

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

                                          Route preference in Junos helps determine which routing information source is preferred when multiple protocols provide routes toward the same destination. It is a local device-level selection value rather than a BGP path attribute exchanged between autonomous systems. AS Path, Cluster List, and MED are associated with BGP route information and influence BGP-related decisions in different ways. Route preference therefore operates at an earlier protocol-selection level, helping Junos choose between competing routes learned from different sources. Understanding this distinction prevents confusion between Junos route selection and individual BGP path-selection attributes.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

                                          View Full Juniper JN0-664 Exam Dumps and Practice Test Dumps.   Question 301 Which IS-IS bit indicates a router should avoid transit traffic? Partition bit Attached bit Overload bit Purge flag Correct Answer: 3 Explanation: The IS-IS overload bit indicates that a router should generally not be selected as a transit router for certain traffic. […]<\/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\/15736"}],"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=15736"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/15736\/revisions"}],"predecessor-version":[{"id":15737,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/15736\/revisions\/15737"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=15736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=15736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=15736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}