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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 | - Service provider network design basics
|
| MPLS and Service Provider Technologies | - VPN services
|
| Troubleshooting and Operations | - Performance and monitoring
|
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NEW QUESTION # 92
What prevents routing loops in a single-area OSPF network?
Answer: A
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 # 93
Click the Exhibit button.
Referring to the exhibit, which two statements are true? (Choose two.)
Answer: B,C
Explanation:
The routing table shows two equal-cost next hops for the prefix and both are installed in the forwarding table, which means the router is selecting both next hops for forwarding traffic. This indicates equal-cost multipath forwarding.
The forwarding table entry shows a load-balancing group containing both next hops, which reflects the default Junos behavior of performing load balancing across equal-cost paths when multiple next hops exist for the same route.
NEW QUESTION # 94
What are three well-known mandatory BGP attributes? (Choose three.)
Answer: B,D,E
Explanation:
Well-known mandatory:Recognized by all BGP peers, passed to all peers, and present in all Update messages. Well-known mandatory attributes include:- Next-hop- Origin- AS PATH Well- known discretionary:Recognized by all routers, passed to all peers, and optionally included in the Update message. Well-known discretionary attributes include:- Local Preference- Atomic Aggregate Optional transitive:Possibly recognized by BGP routers and passed to BGP peers.
Optional transitive attributes are marked as partial when not recognized.
Optional transitive attributes include:- Aggregator- Community
Optional non-transitive:Possibly recognized by BGP routers but not passed to peers.
Optional non- transitive attributes include:- Multi-exit discriminator (MED)-Originator ID-Cluster-ID The three well-known mandatory BGP attributes that must be present in every BGP update message are:
Next Hop: Indicates the next hop IP address to reach the advertising BGP peer.
Origin: Indicates how the route was originated, whether it was via IGP, EGP, or incomplete. AS Path: Lists the autonomous systems that the update has traversed.
NEW QUESTION # 95
When would you use the qualified-next-hop statement with a static route?
Answer: C
Explanation:
Qualified next hops allow you to associate one or more properties with a particular next-hop address. You can set an overall preference for a particular static route and then specify a different preference for the qualified next hop. For example, suppose two next-hop addresses (10.10.10.10 and 10.10.10.7) are associated with the static route 192.168.47.5/32. A general preference is assigned to the entire static route, and then a different preference is assigned to only the qualified next-hop address 10.10.10.7. For example:
The qualified-next-hop statement with a static route is used to specify multiple next hops for a static route with different preferences (priorities). This allows for more granular control over the path selection process in the event that the primary next hop becomes unreachable.
NEW QUESTION # 96
You are designing a high availability solution for a Juniper router with dual Routing Engines (RE).
You want to ensure that the routing protocol state is preserved during an RE switchover. You have already enabled graceful Routing Engine switchover (GRES) and you want to avoid relying on helper routers to maintain the routing protocol state.
In this scenario, which feature would accomplish this behavior?
Answer: D
Explanation:
Nonstop Active Routing (NSR) synchronizes routing protocol state information between the primary and backup Routing Engines so that protocol sessions remain active during a Routing Engine switchover. Because the protocol state is maintained internally on the router, neighbors are not required to support or act as helpers, allowing routing protocols such as BGP and OSPF to continue operating without session resets.
NEW QUESTION # 97
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