An engineer needs to prevent Type 4 and Type 5 LSAs from entering a specific OSPF area while still allowing external routes to be summarized via default routing. Which area type should be configured?
You are configuring an OSPF interface on a Junos router and want to ensure that the interface never participates in DR/BDR election, always acting as a point-to-point connection. Which interface type should you explicitly configure?
You need to configure an OSPF interface as passive on a Junos routing platform so that it advertises connected subnets without sending OSPF hello packets. Which configuration command achieves this?
An OSPF network running on Junos has multiple equal-cost paths to a destination. By default, how many equal-cost paths does Junos OSPF install into the forwarding table (inet.0)?
An administrator needs to modify the OSPF cost on a specific Junos interface to influence traffic engineering without changing the reference bandwidth globally. Which command accomplishes this?
An enterprise network has redundant ABRs connecting Area 1 to Area 0. To prevent suboptimal routing and unnecessary Type 3 LSA flooding, an administrator decides to filter inter-area summary routes on the ABR using a Junos policy. Which configuration component is required to apply an export policy to OSPF summary routes on an ABR?
You are configuring OSPF redistribution on a Junos router and want to ensure that external routes imported from a static routing table retain an escalating external metric. Which external route metric type (E1 or E2) should you choose if you want the internal cost to be added to the external cost during path selection?
A Junos router running OSPF is configured with graceful restart helper mode enabled. What is the primary role of an OSPF graceful restart helper router during a control plane restart of a neighboring router?
Which THREE conditions must match between neighboring OSPF routers for an adjacency to successfully transition from Init to ExStart/Exchange? (Choose three)
An administrator is reviewing OSPF link-state database entries using the Junos command 'show ospf database'. Which THREE LSA types appear in the output of a standard non-backbone area router? (Choose three)
An administrator is troubleshooting an OSPF adjacency issue on an interface connecting two Juniper vMX routers. Both routers are stuck in the 2-Way state on a broadcast segment. Which configuration parameter must match on both routers for the adjacency to progress beyond 2-Way?
When examining an OSPF link-state database on a Junos device, which THREE LSA types are flooded exclusively within the local area and do not cross Area Border Routers (ABRs) into other areas? (Choose three.)
You are troubleshooting an OSPF adjacency between two Juniper routers in area 0. The routers are directly connected and can ping each other, but the adjacency remains in the ExStart state. You suspect an MTU mismatch. Which Junos configuration statement on the interface resolves the issue without changing the physical MTU?
You are configuring OSPF on a Juniper MX Series router. The router has two interfaces in the same OSPF area: ge-0/0/0 and ge-0/0/1. You want to ensure that the router ID is always 10.1.1.1, regardless of interface IP addresses or the order in which interfaces become active. Which configuration statement accomplishes this?
You are configuring OSPF on a Juniper router and want to advertise a loopback interface into OSPF so that its address is always reachable. Which configuration statement correctly places the loopback interface into OSPF area 0?
You are configuring OSPF on a Junos router. You want to influence the DR/BDR election on a broadcast network so that a specific router becomes the DR. Which two interface parameters can you set to increase the likelihood of a router being elected as DR? (Choose two.)
You are troubleshooting an OSPF network where a Juniper router is not installing a route to a remote network in its routing table. You verify that the route is present in the OSPF database as a Type 5 LSA. The router is an ABR connected to area 0 and area 1. What is the most likely reason the route is not being installed?
While reviewing OSPF logs on a Junos device, you notice frequent adjacency flaps. You suspect a mismatch in the OSPF timer configurations. Which two timers must match identically on adjacent OSPF interfaces for an adjacency to form?
An OSPF area contains routers running Junos OS where external routes must be imported into the OSPF domain from a BGP core. However, the area must not accept external AS-external LSAs (Type 5) from other areas, but must allow routers within this area to originate external routes themselves. Which area type fulfills this requirement?
You are troubleshooting an OSPF adjacency issue between two Juniper EX Series switches. One switch logs an error stating 'OSPF packet received with mismatched area ID'. Where in the Junos CLI should you check and correct this parameter?
An administrator is configuring OSPF on a Junos device and notices that two routers on a broadcast segment are stuck in the 2-Way state. What is the most likely cause of this behavior on a broadcast network?
Which LSA type is originated by a Designated Router (DR) on a broadcast or NBMA network to describe all the routers attached to that multi-access segment?
You are configuring OSPF route summarization on an ABR in a Junos environment. You want to summarize routes from Area 1 into Area 0. Which Junos configuration hierarchy is used to define this summary?
When calculating OSPF path costs in a network containing high-speed links (such as 10Gbps and 40Gbps interfaces), what default reference bandwidth does Junos use, and what configuration adjustment is typically required to differentiate costs accurately?
You are troubleshooting an OSPF network where an ASBR is injecting external routes. Routers in other areas need to reach this ASBR. Which LSA type provides the reachability information to the ASBR itself?
In an OSPF NSSA configuration on a Junos device, which router is specifically responsible for translating Type 7 LSAs into Type 5 LSAs when propagating routes out of the NSSA into the backbone?
You are configuring authentication for OSPF on a Junos router using MD5. Where must the MD5 key ID and password be defined in the configuration hierarchy?
During OSPF database synchronization, two Junos routers exchange Database Description (DBD) packets. One router repeatedly sends DBD packets with the master/slave bit set incorrectly or encounters sequence number mismatches, causing the adjacency to loop in the Exchange state. Which OSPF packet type is immediately sent by a router to request missing link-state information once the ExStart/Exchange transition completes?
An enterprise network runs OSPF across multiple areas. A Junos routing device receives an LSA with an aging timer approaching MaxAge (3600 seconds). Under what condition does a router purge or flush an LSA from its link-state database?
You are troubleshooting an OSPF network and notice that a router's OSPF state is stuck in 'ExStart'. What is the most common reason for this adjacency state issue?
You are configuring OSPF on a Junos device and need to ensure that the router prefers internal OSPF intra-area paths over inter-area paths, and inter-area paths over external paths. According to OSPF route preference rules, what is the evaluation order?
An administrator implements OSPF on a Junos router with virtual links to span a disconnected non-backbone area across a non-backbone transit area to reach Area 0. What is a key design best practice regarding OSPF virtual links in enterprise networks?
An administrator wants to configure an OSPF Not-So-Stubby Area (NSSA) on a Junos router. Which THREE characteristics distinguish an NSSA from a standard OSPF Stub Area? (Choose three)
A network engineer wants to inject external routes into an OSPF domain using Junos OS. The routes originate from an external BGP process. Which OSPF LSA type is generated by the ASBR to describe these external destinations?
You are configuring OSPF on a Junos device and notice that Type 3 LSAs are not being generated or propagated into a specific area. When examining the configuration under protocols ospf, you see that the area is defined with the no-summaries parameter. Which area type has been configured?
You are troubleshooting an OSPF network where an NSSA area is connected to the backbone via an ABR. External routes are being injected into the NSSA by an ASBR. Which router is responsible for translating Type 7 LSAs into Type 5 LSAs before flooding them into the backbone area?
During the establishment of an OSPF adjacency, two routers exchange Database Description (DBD) packets. What is the primary purpose of the DBD packet exchange in the OSPF protocol sequence?
An operator executes the 'show ospf database' command on a Junos device and notices multiple Type 2 Network LSAs. Under which specific network topology condition are Type 2 LSAs generated?
You are tasked with tuning OSPF convergence times on a Juniper EX Series switch. Which configuration command hierarchy allows you to modify the OSPF Hello and Dead intervals on a specific interface?
An administrator needs to configure an OSPF stub area on a Juniper router. Which THREE characteristics apply to a standard OSPF stub area? (Choose three.)
You are configuring OSPF on a Juniper router. The router must not generate any OSPF packets or form adjacencies on interface ge-0/0/1, but the interface must remain in the OSPF configuration for future use. Which configuration statement accomplishes this?
You are configuring OSPF on a Juniper router and need to control which router becomes the Designated Router (DR) on a broadcast network. Which two statements about OSPF DR election on Junos are true? (Choose two.)
You are troubleshooting an OSPF network on Junos devices. A router in area 1 is not receiving external routes from an ASBR in area 0. The ABR connecting the areas is correctly configured. You suspect a problem with LSA flooding. Which LSA type is used by the ASBR to advertise external routes, and what is its flooding scope?
You are configuring OSPF on a Juniper EX Series switch. You want to change the OSPF hello interval and dead interval on a specific interface to improve convergence. Which configuration hierarchy should you use?
You are troubleshooting an OSPF adjacency issue on a Junos router. The neighbor state is stuck in 'ExStart'. You have verified that the interfaces are up and IP connectivity exists. Which configuration mismatch is most likely causing this problem?