OSPF

What is the OSPF router ID format used by Junos OS when initializing the OSPF routing process if no explicit router ID is configured?

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?

Which TWO features characterize OSPFv3 compared to OSPFv2? (Choose two)

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?

Which command allows an administrator to view the OSPF link-state database (LSDB) summary on a Junos device?

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?

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?

Which OSPF packet type is used to acknowledge the receipt of Link-State Updates (LSUs) to ensure reliable flooding?

Which TWO actions occur during OSPF link-state database flooding on a Junos routing device? (Choose two)

Which TWO OSPF packet types are used for reliable flooding and direct acknowledgment of Link State Advertisements? (Choose two.)

What type of LSA is generated by an OSPF Area Border Router (ABR) to advertise networks from one area to another area?

Which Junos command displays detailed information about OSPF neighbor states, including dead timer countdowns and address bindings?

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?

Which command is used on a Junos device to clear the OSPF database and force a re-synchronization with neighbors?

Which TWO states are valid OSPF operational adjacency states seen in Junos operational outputs? (Choose two)

What is the primary function of the OSPF Designated Router (DR) on a broadcast network segment?

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?

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 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?

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?

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.)

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?

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?

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 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?

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 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?

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?

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?

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?

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?

Which OSPF area is mandatory in any multi-area OSPF routing architecture?

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?

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?

Which OSPF packet type is responsible for discovering neighbors and maintaining adjacencies on a Junos device?

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?

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 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 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?

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)

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?