OSPF

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

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 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 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?

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

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?

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?

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)?

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?

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

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?

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

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?

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

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?

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

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 need to verify the router ID elected by OSPF on a Junos routing device. Which operational command provides this information quickly?

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?

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

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?

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

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?

What information is contained within an OSPF Type 1 (Router LSA)?

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?

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?

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

Which TWO statements correctly describe OSPF Area Border Routers (ABRs) in a Junos environment? (Choose two)

Which TWO criteria are used by Junos OS to select the OSPF router ID if no explicit router ID is configured under [edit routing-options]? (Choose two)

Which THREE LSA types are blocked from entering a standard OSPF Stub Area? (Choose three)

Which TWO packet types are utilized during the OSPF database synchronization process after neighbor adjacencies are established? (Choose two)

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

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

Which THREE types of routers can act as an OSPF Autonomous System Boundary Router (ASBR)? (Choose three)

Which TWO commands can an administrator use on a Junos device to verify OSPF interface configurations and operational status? (Choose two)

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

Which TWO LSA types are flooded throughout a single OSPF area and do not cross ABRs into other areas? (Choose two)

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)

Which TWO troubleshooting commands help identify OSPF route installation issues in the Junos routing table? (Choose two)

Which TWO packet types are sent reliably (requiring acknowledgment) by OSPF routers during communication? (Choose two)

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)

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?

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?

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?

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

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.)

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.)