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【General】 Customized JN0-364 Lab Simulation - New JN0-364 Test Pass4sure

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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q55-Q60):NEW QUESTION # 55
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?
  • A. non-stop active bridging
  • B. bidirectional forwarding detection
  • C. non-stop active routing
  • D. graceful restart
Answer: C
Explanation:
When designing High Availability (HA) for Juniper Service Provider routers, understanding the interaction between the control plane and data plane is vital. The user has already enabledGraceful Routing Engine Switchover (GRES), which synchronizes the interface and kernel state between the primary and backup Routing Engines (REs). However, GRES by itself does not preserve the routing protocol state (like OSPF adjacencies or BGP sessions).
To achieve the preservation of the routing protocol state without relying on external "helper" routers, you must implementNon-Stop Active Routing (NSR). According to Juniper Networks documentation, NSR uses the infrastructure provided by GRES to also synchronize the routing protocol process (rpd) information.
Under NSR, the backup RE maintains a "hot" standby state of all routing protocols. If the primary RE fails, the backup RE takes over immediately. Because it already possesses the full routing table and peer session states, the peering neighbors are unaware that a switchover occurred. No protocol adjacency resets occur, and traffic continues to flow uninterrupted.
It is crucial to differentiate NSR fromGraceful Restart (Option C). While Graceful Restart also aims to maintain traffic flow during a switchover, itdoesrequire help from neighboring routers (known as "helper mode"). If the neighbors do not support or are not configured for Graceful Restart, the sessions will drop.
Since the user explicitly stated they want to "avoid relying on helper routers," Graceful Restart is not the correct solution.
Non-stop Active Bridging (Option A)provides a similar "hitless" failover but specifically for Layer 2 environments (STP/VLANs) rather than Layer 3 routing protocols.BFD (Option B)is a failure detection protocol used to speed up convergence but does not preserve state during an RE failover; in fact, without NSR, BFD would likely trigger a faster teardown of the session during a switchover. Therefore,NSRis the only feature that meets the requirement for independent control-plane preservation.

NEW QUESTION # 56
In an OSPF network, what is a purpose of a designated router?
  • A. to reduce OSPF traffic on the OSPF segment
  • B. to assign an OSPF router ID to all routers in the OSPF segment
  • C. to forward traffic within the configured subnet
  • D. to flood routes to all other OSPF devices in the entire domain
Answer: A
Explanation:
On multi-access network segments, such asEthernet, OSPF could potentially face a scalability issue. If every router on a segment formed a full adjacency with every other router, the number of adjacencies would follow the formula $n(n-1)/2$. In a segment with 10 routers, this would result in 45 adjacencies, each generating redundant flooding of Link-State Advertisements (LSAs) and excessive Hello traffic.
To solve this, OSPF elects aDesignated Router (DR)and aBackup Designated Router (BDR). According to Juniper Networks documentation, the primary purpose of the DR is to act as a central point of contact for the segment, therebyreducing OSPF traffic (Option C).
Instead of every router syncing with every other router, they all form aFull adjacencyonly with the DR and BDR. When a router (a DR-Other) has an update, it sends it to the multicast address224.0.0.6(All DR Routers). The DR then acknowledges the update and floods it to all other routers on the segment using the multicast address224.0.0.5(All OSPF Routers). This "hub-and-spoke" signaling model within the local segment significantly minimizes the bandwidth consumed by protocol overhead and reduces the CPU load on the participating routers.
It is important to note that the DR's scope is limited to the local segment; it does not "assign IDs" (Option A) nor does it flood routes to the "entire domain" (Option D), as that is the responsibility of individual routers within their respective areas.

NEW QUESTION # 57
Exhibit:

You have configured an MPLS LSP to 192.168.100.3. However, the LSP is in the down state. Referring to the exhibit, which two actions would solve this problem? (Choose two.)
  • A. Issue the set interfaces lo0 family mpls command on router R1 and commit.
  • B. Issue the set routing-options rib inet.3 static route 192.168.100.1 command and commit.
  • C. Issue the set protocols mpls label-switched-path to-r3 no-cspf command and commit.
  • D. Issue the set protocols ospf traffic-engineering command and commit.
Answer: C,D
Explanation:
In a Juniper Networks environment, establishing a functionalMultiprotocol Label Switching (MPLS)Label- Switched Path (LSP) requires synchronized control plane operations. According to Juniper technical documentation, the most common reason for an LSP to remain in the "Down" state at the ingress router is a failure of theConstrained Shortest Path First (CSPF)algorithm during the path computation phase.
The provided exhibit for routerR1reveals a critical error in the show mpls lsp detail output: "CSPF: could not determine self". This specific error indicates that the CSPF process is unable to find its own local router ID within theTraffic Engineering Database (TED). For CSPF to build a valid TED, the underlying Interior Gateway Protocol (IGP), such as OSPF, must be configured to flood opaque link-state advertisements (Type
10 LSAs) that carry traffic engineering attributes. As seen in the OSPF configuration, traffic engineering is not enabled. Therefore, issuing theset protocols ospf traffic-engineeringcommand (Option D) will allow R1 to populate the TED with its own local information and that of its neighbors, enabling CSPF to calculate a valid path.
Alternatively, an administrator can choose to bypass the requirement for a TED entirely by disabling CSPF on the specific LSP. By issuing theset protocols mpls label-switched-path to-r3 no-cspfcommand (Option B), the router will stop attempting to perform a constrained path calculation. Instead, the signaling protocol (RSVP) will rely on the standardinet.0routing table to determine the hop-by-hop path to the egress destination (192.168.100.3), allowing the LSP to establish without traffic engineering constraints.
Regarding the other options, whilefamily mplsis required on all transit interfaces, the ingress loopback interface (lo0) generally does not require it for standard LSP signaling unless it's used as a transit hop.
Furthermore, adding a static route toinet.3(Option A) is used for next-hop resolution of BGP routes over LSPs but does not assist in the signaling or establishment of the LSP itself.

NEW QUESTION # 58
Which IS-IS adjacency state indicates that hello packets have been exchanged but the adjacency is not yet fully established?
  • A. up
  • B. two-way
  • C. initializing
  • D. loading
Answer: C
Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol, the process of forming an adjacency between two neighbors follows a specific sequence of states. While OSPF uses states like "Init," "Two-Way," and "Full," IS-IS uses a slightly different nomenclature within its state machine.
According to Juniper Networks technical documentation, when a router first sends anIS-IS Hello (IIH) PDU and receives one back from a neighbor, but has not yet confirmed that the neighbor "sees" it back, the adjacency enters theInitializingstate. Specifically, on a point-to-point link, the state transitions fromDownto Initializingas soon as the first PDU is received. On a broadcast network (like Ethernet), the Initializing state indicates that the local router has received a Hello PDU from the neighbor, but the local router's own System ID is not yet listed in the neighbor's list of "seen" neighbors (the neighbor's Hello PDU does not yet contain the local router's MAC address).
The adjacency only moves to theUpstate (Option C) once bi-directional communication is confirmed- meaning both routers have seen each other's System IDs in the incoming Hello PDUs.
Why other options are incorrect:
* Loading (Option A):This is an OSPF state, not an IS-IS state. In IS-IS, database synchronization happens after the adjacency is Up.
* Two-Way (Option D):While functionally similar to the state IS-IS is achieving, "Two-Way" is the specific terminology for OSPF. In IS-IS, the intermediate step between knowing a neighbor exists and having a fully functional adjacency is strictly calledInitializing.

NEW QUESTION # 59
During OSPF neighbor establishment, which packet type is used to describe the contents of the link-state database?
  • A. Link-State PDU (LSP)
  • B. Link-State Request (LSR)
  • C. Database Description (DBD)
  • D. Hello packet
Answer: C
Explanation:
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.

NEW QUESTION # 60
......
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