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| Section | Objectives |
|---|---|
| Topic 1: Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| Topic 2: MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Topic 3: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
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| Topic 4: Troubleshooting and Operations | - Performance and monitoring
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| Topic 5: BGP and Routing Policy | - Routing policy control
|
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問題 #151
Which two LSA types are permitted in OSPF totally stubby areas? (Choose two.)
答案：B,C
問題 #152
During OSPF neighbor establishment, which packet type is used to describe the contents of the link-state database?
答案：D
解題說明：
In theOSPF (Open Shortest Path First)protocol, ensuring that all routers within an area have a synchronized Link-State Database (LSDB)is fundamental to building a consistent loop-free topology. During the adjacency formation process-specifically when transitioning from theExStartstate to theExchangestate- routers must determine what information they are missing from their neighbors without sending the entire database at once, which would be highly inefficient.
TheDatabase Description (DBD)packet, also known as a DDP, is the mechanism used for this summary exchange. According to Juniper Networks technical documentation, the DBD packet does not contain full Link-State Advertisements (LSAs). Instead, it contains only theLSA headers, which include the LSA type, the ID of the advertising router, and the sequence number.
By exchanging these headers, a Juniper router can compare the neighbor's database summary against its own local LSDB. If the router identifies a header in the DBD packet that represents a newer or missing entry, it records that LSA in its "Link-State Request List." This collaborative "handshake" ensures that only the necessary, updated information is requested in the subsequentLink-State Request (LSR)phase. It is important to distinguish this from theLink-State PDU (LSP)mentioned in Option D, which is actually the term used in the IS-IS protocol, not OSPF. In OSPF, the functional unit is the LSA, and the transport vehicle for the initial summary is the DBD packet. This methodical synchronization is what allows OSPF to scale effectively in large service provider environments.
問題 #153
Which two statements about graceful restart are correct? (Choose two.)
答案：B,C
解題說明：
Graceful restart restarting router mode must be explicitly configured on a router. By default, a router does not advertise that it will perform graceful restart for its own control plane restart.
Graceful restart helper mode is enabled by default on Junos routers. In this mode, the router assists a neighboring router that is performing a graceful restart by preserving its routes temporarily while the neighbor restarts and reestablishes protocol sessions.
問題 #154
Which OSPF database packet determines which router is in charge of the database synchronization and the transferring of LSA headers between the two systems?
答案：D
解題說明：
The Database Description (DD) packets serve two main purposes:
1. determinining which router is in charge of the database synchronization
2. tansferring the LSA headers between the two systems
The Database Description (DBD) OSPF packet is used during the adjacency formation process to describe the contents of the topological database between routers. The routers exchange DBD packets to determine the master and slave relationship, which dictates the router in charge of the database synchronization.
問題 #155
You are asked to configure filter-based forwarding on a Junos device. Which two statements are correct in this scenario? (Choose two.)
答案：A,B
解題說明：
Filter-based forwarding in Junos requires the creation of a routing policy to specify the match conditions and actions and the application of a match filter to classify traffic to use the policy.
問題 #156
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