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| Section | Objectives |
|---|---|
| Topic 1: Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| Topic 2: MPLS and Service Provider Technologies | - VPN services
|
| Topic 3: BGP and Routing Policy | - Routing policy control
|
| Topic 4: Troubleshooting and Operations | - Performance and monitoring
|
| Topic 5: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
>> JN0-364 Most Reliable Questions <<
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NEW QUESTION # 123
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.)
Answer: A,B
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 # 124
Which statement is correct about IS-IS?
Answer: C
Explanation:
IS-IS is a link-state routing protocol that uses a Shortest Path First (SPF) algorithm to create a topology map of the network. It floods link-state advertisements (LSAs) to all nodes within the network area to ensure each node has a consistent view of the network topology.
NEW QUESTION # 125
You are configuring BGP for IPv6 operations. In this scenario, which two statements are correct? (Choose two.)
Answer: A,C
Explanation:
When implementingMultiprotocol BGP (MP-BGP)for IPv6, several architectural constants remain consistent with the original BGP design, while others have evolved to accommodate larger network scales.
Router ID (Option C):
A critical point in Juniper's Service Provider documentation is that theBGP Router IDremains a32-bit value, even when the protocol is carrying 128-bit IPv6 prefixes. The Router ID is typically represented in dotted- quad notation (e.g., 192.168.1.1). In an IPv6-only environment, a Juniper router cannot automatically derive this ID from an interface address, so it must be manually defined under [edit routing-options]. This 32-bit ID is essential for BGP tie-breaking and loop prevention within the AS.
Autonomous System Number (Option D):
TheAutonomous System Number (ASN)was originally a 16-bit value (0 to 65535). However, to address the exhaustion of available ASNs, the standard was extended to32-bit ASNs(documented in RFC 6793). In Junos OS, you can configure BGP using either the older 16-bit format or the newer 32-bit format (often represented in "asplain" or "asdot" notation). While the question mentions a 64-bit value, there is currently no standard for a 64-bit ASN in BGP; the transition from 16-bit to 32-bit satisfies current global scalability needs. Therefore, Option D is the most accurate within the context of current networking standards, as it acknowledges the coexistence of different ASN lengths.
NEW QUESTION # 126
Which BGP attribute is optional, transitive, and is passed unchanged to other BGP peers if not recognized?
Answer: D
Explanation:
The Community attribute is an optional transitive BGP attribute. Optional transitive attributes are propagated to other BGP peers even if a router does not recognize them. The Community attribute is commonly used to tag routes so that routing policies can apply specific handling to those routes as they propagate through the network.
NEW QUESTION # 127
What are three types of MPLS routers? (Choose three.)
Answer: A,C,D
Explanation:
In an MPLS network, the types of routers include ingress routers (where the MPLS labels are first applied), egress routers (where MPLS labels are removed), and transit routers (which switch MPLS- labeled packets through the MPLS network). Peering routers and aggregation routers are not specific types of MPLS routers; they are general network terms.
NEW QUESTION # 128
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