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| Section | Objectives |
|---|---|
| BGP and Routing Policy | - Routing policy control
|
| OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Troubleshooting and Operations | - Network troubleshooting methodology
|
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NEW QUESTION # 142
The MPLS Label Information Base (LIB) is stored in which table?
Answer: D
Explanation:
In Junos OS, the Routing Engine maintains several different tables to manage various types of reachability and forwarding information. When a router is running MPLS, it must track both IP routes and label-to-label mappings.
Thempls.0table is the primary repository for theLabel Information Base (LIB)and theLabel Forwarding Information Base (LFIB). According to Juniper Networks documentation, mpls.0 is used by transit and egress routers to perform label lookups. When a labeled packet arrives at an interface, the router looks at the top label and references the mpls.0 table to determine the next action. This table stores the mapping of incoming labels to their corresponding operations:Pop(remove the label),Swap(replace the label), orPush(add an additional label).
It is crucial to understand the roles of the other tables to avoid confusion:
* inet.0 (Option D):This is the default unicast routing table for IPv4, used for standard IP-to-IP forwarding.
* inet.3 (Option C):This is theMPLS Path Table. It stores the egress loopback addresses of LSPs and is used by BGP for next-hop resolution to determine if a destination can be reached via an MPLS tunnel.
While inet.3 knowsaboutLSPs, the actual label-switching instructions reside in mpls.0.
* inet6.0 (Option A):This is the default unicast routing table for IPv6.
Therefore, for the specific purpose of storing the label base used for transit switching operations,mpls.0is the correct and only table used in the Junos architecture.
NEW QUESTION # 143
Which two statements are correct about default BGP route propagation? (Choose two.)
Answer: B,C
NEW QUESTION # 144
Which two statements ate correct about the community BGP attribute on a Junos device?
(Choose two.)
Answer: A,C
Explanation:
The community attribute in BGP is an optional transitive attribute. It is not mandatory for BGP operations, but when it is present, it should be passed unchanged to other BGP peers unless explicitly modified by a routing policy. The community attribute is used to group destinations in a certain way, often to apply routing policies to those destinations collectively.
NEW QUESTION # 145
What prevents routing loops in a single-area OSPF network?
Answer: D
Explanation:
In OSPF, loop prevention within a single area is achieved through the fundamental nature of its link-state architecture. Unlike distance-vector protocols that rely on "routing by rumor," OSPF ensures that every router within an area maintains an identicalLink-State Database (LSDB). This database acts as a complete map of the network topology.
Once the LSDB is synchronized, each router independently executes theShortest Path First (SPF) algorithm
, which is formally known as theDijkstra algorithm. This mathematical process treats the local router as the
"root" of a tree and calculates the shortest path to every other node (router) and prefix in the area based on the cumulative interface costs. Because every router uses the same synchronized map (the LSDB) and the same deterministic algorithm, they all arrive at a consistent, loop-free view of the best paths.
According to Juniper Networks technical documentation, the Dijkstra algorithm is superior to theBellman- Ford algorithm(used by distance-vector protocols like RIP) in this regard. Bellman-Ford is susceptible to
"count-to-infinity" problems and loops because routers only know the distance and direction to a destination provided by their neighbors, rather than the full topology. In OSPF, even if a link fails, the updated Link-State Advertisement (LSA) is flooded rapidly, and the Dijkstra algorithm is re-run to find a new loop-free path.
Routing policies(Option B) are used to manipulate path selection or filter routes but are not the primary mechanism for fundamental loop prevention in OSPF. Similarly,forwarding policies(Option D) govern how traffic is handled at the data plane level rather than determining the control plane's loop-free topology.
NEW QUESTION # 146
You are asked to configure an RSVP LSP.
Under which hierarchy is this configuration performed?
Answer: B
Explanation:
RSVP-signaled LSPs are configured under the protocols mpls hierarchy in Junos OS. The label- switched-path configuration that defines the LSP parameters, destination, bandwidth, and path options is placed under this hierarchy, while the protocols rsvp hierarchy is used only to enable and control RSVP signaling on interfaces.
NEW QUESTION # 147
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