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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q137-Q142):

NEW QUESTION # 137
You are monitoring OSPF on a router and notice frequent state changes between Full and Down. Which condition would cause this behavior?

Answer: A

Explanation:
When troubleshooting OSPF in a service provider environment, distinguishing between "stuck" adjacencies and "flapping" adjacencies is the first step. A session that transitions frequently betweenFullandDown indicates that the relationship can be established successfully (meaning parameters match), but it cannot be maintained.
According to Juniper Networks documentation, the most common cause for a session to drop from Full to Down is the expiration of theDead Interval. If a router does not receive a Hello packet within the Dead Interval (usually 40 seconds), it tears down the adjacency. Aphysical interface flapping (Option A)is the primary trigger for this. If the physical link or the underlying transport (like a leased line or a microwave link) goes down even momentarily, the OSPF process immediately detects the interface failure, flushes the neighbors, and moves the state to Down. As soon as the interface comes back up, the routers perform the Hello exchange and reach the Full state again, creating the flapping cycle.
Analysis of other options:
* MTU Mismatch (Option D):This typically causes the adjacency to get "stuck" in theExchangeor ExStartstate. The routers can exchange small Hello packets, but when they try to send larger Database Description (DBD) packets that exceed the MTU, the packets are dropped, preventing the session from ever reaching "Full."
* Area ID Mismatch (Option C):This prevents the adjacency from even reaching theInitstate; the routers will never form a neighbor relationship.
* Route Preference (Option B):This affects which route is chosen for the forwarding table but has no impact on the OSPF neighbor state machine itself.


NEW QUESTION # 138
Click the Exhibit button.

Which statement is correct about the configuration shown in the exhibit?

Answer: C


NEW QUESTION # 139
You are bringing a new network online with three IS-IS routers using default Junos election priorities. The routers are configured as Level 2 only IS-IS routers. Which statement is true about the DIS election in this scenario?

Answer: B

Explanation:
A router's priority for becoming the designated router is indicated by an arbitrary number from 0 through 127, which you configure on the IS-IS interface. The router with the highest priority becomes the designated router for the area (Level 1, Level 2, or both), also configured on the IS- IS interface. If routers in the network have the same priority, then the router with the highest MAC address is elected as the designated router. By default, routers have a priority value of 64.


NEW QUESTION # 140
What are three default BGP advertisement rules? (Choose three.)

Answer: B,D,E

Explanation:
Routes learned from an iBGP neighbor are not advertised to other iBGP neighbors. This rule prevents routing loops inside an autonomous system and is the reason mechanisms such as route reflectors or confederations are required.
Routes learned through either iBGP or eBGP can be advertised to eBGP neighbors. This allows prefixes to propagate between autonomous systems.
Routes learned from eBGP peers can be advertised to iBGP peers within the same autonomous system so internal routers can learn external destinations.


NEW QUESTION # 141
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?

Answer: A

Explanation:
In a Multiprotocol Label Switching (MPLS) environment, label operations are categorized into three primary actions:Push(adding a label),Swap(replacing a label), andPop(removing a label). The specific behavior described in the question refers to a mechanism calledPenultimate Hop Popping (PHP).
According to Juniper Networks technical documentation, the goal of PHP is to improve forwarding efficiency at the egress point of a Label-Switched Path (LSP). TheEgress Label Edge Router (LER), which is the final destination for the LSP, would normally have to perform two lookups if it received a labeled packet: first, it would look up the label in its MPLS table to see it is the destination, and second, it would look up the underlying IP payload in its IP routing table (inet.0) to forward the packet.
To alleviate this burden, the Egress LER signals a special label value calledImplicit Null (Label 3)to its upstream neighbor (the penultimate router) during the signaling process (RSVP or LDP). When the penultimate routerreceives a packet destined for that egress LER, it sees the instruction to pop the transport label. Consequently, the penultimate router performs aPopoperation, stripping away the outer MPLS label and sending the raw IP packet (or the remaining inner service label) to the Egress LER.
This allows the Egress LER to perform only a single lookup. If the transport label was the only label, the Egress LER simply performs a standard IP lookup. If there is a VPN label remaining, it performs a single MPLS lookup for the VRF. This "default" behavior in Junos OS optimizes the performance of the egress router by offloading the final label removal to the penultimate hop. Note that ifUltimate Hop Popping (UHP) were configured (via the explicit-null command), the penultimate router would perform aSwapto Label 0 instead of a Pop.


NEW QUESTION # 142
......

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