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| Section | Objectives |
|---|---|
| OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Troubleshooting and Operations | - Performance and monitoring
|
| BGP and Routing Policy | - Routing policy control
|
| MPLS and Service Provider Technologies | - VPN services
|
| Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
>> JN0-364 Valid Test Objectives <<
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NEW QUESTION # 97
Referring to the exhibit, you have an established RSVP LSP between R1 and R4 when you experience a link failure between R2 and R3.
Which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
Upon a link failure in an RSVP-signaled LSP, the router upstream of the failure (R2) sends a PathTear message upstream to the ingress router (R1), and the router downstream of the failure (R3) sends a ResvTear message downstream to the egress router (R4). These messages signal the failure and initiate tear down of the LSP state in the respective directions.
NEW QUESTION # 98
Which OSPF database packet determines which router is in charge of the database synchronization and the transferring of LSA headers between the two systems?
Answer: B
Explanation:
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.
NEW QUESTION # 99
Which statement about RSVP-signaled LSPs is correct?
Answer: B
Explanation:
RSVP traffic-engineered LSPs use constraint-based shortest path first (CSPF) to compute a path that satisfies TE constraints such as bandwidth, metrics, and administrative groups. The resulting path is then signaled hop-by-hop using RSVP.
NEW QUESTION # 100
Which OSPF packet type is used to initiate and maintain neighbor relationships?
Answer: A
Explanation:
TheHello packetis the most basic, yet most vital, component of the OSPF protocol. It serves as the primary mechanism for neighbor discovery, parameter negotiation, and "keepalive" functionality. Per Juniper Networks' routing documentation, OSPF routers use the Hello protocol to dynamically discover other OSPF- enabled routers on their directly connected segments.
When OSPF is enabled on a Junos interface, the router begins multicasting Hello packets (typically to the
224.0.0.5"All OSPF Routers" address). This initiates the neighbor relationship. For two routers to move beyond theInitstate and become neighbors, they must agree on several critical parameters contained within the Hello packet:
* Area ID:Routers must be in the same OSPF area.
* Authentication:Passwords or keys must match.
* Timers:The Hello and Dead intervals must be identical.
* Options:Such as Stub area flags.
Beyond the initial "initiation," the Hello packet is used tomaintainthe relationship. By continuously sending these packets at a fixed interval (the Hello interval), a router signals to its peers that it is still functional. If a router stops receiving Hello packets from a neighbor for a duration exceeding theDead Interval, it declares the neighbor "down," flushes the associated LSAs from the database, and triggers a new SPF calculation.
Furthermore, on multi-access networks like Ethernet, the Hello packet is the vehicle for the election of the Designated Router (DR)andBackup Designated Router (BDR). By exchanging priority values and Router IDs within the Hello packets, the segment can elect a central point of contact to minimize the number of adjacencies required on the wire.
NEW QUESTION # 101
The MPLS Label Information Base (LIB) is stored in which table?
Answer: B
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 # 102
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