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Juniper Service Provider Routing and Switching, Specialist JN0-363 JNCIS-SP Exam Practice Test
Question 1
Click the Exhibit button.
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, D
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. Reference::
RSVP-TE Overview, Juniper Networks Documentation
Understanding RSVP Signal Failures, Juniper Networks Documentation
Question 2
Exhibit
Which two statements are correct about the information shown in the exhibit? (Choose two.)
Answer : A, C
The exhibit shows the output of the command show spanning-tree bridge, which provides information about the spanning tree status of the switch. From the output, we can see that the switch has a bridge ID different from the root ID, which implies that this switch is not the root bridge. The 'Topology change initiator' field shows ge-0/0/14, which indicates that the last topology change occurred on this interface, and this is also the interface used to reach the root bridge.
Juniper Networks documentation on Spanning Tree Protocol: Understanding Spanning Tree Protocols
Question 3
Which two statements are correct about segment routing? (Choose two.)
Answer : A, B
Segment routing is a source routing paradigm that allows a source router to define the path that a packet will take through the network by assigning an ordered list of segments---identifiers that specify a forwarding path for the packet through the network. Segment Routing can be implemented over an MPLS architecture or with IPv6 (SRv6).
A . Segment routing does not require a full mesh of adjacencies or state per transit path in the network, which is often the case with conventional MPLS signaling protocols like RSVP-TE. It leverages the existing IGP topology for forwarding without the need to maintain a state for each LSP (Label Switched Path), hence requiring very little resources to maintain.
B . In segment routing, labels (or segments) are distributed via IGP routing protocols like OSPF or IS-IS with extensions to carry segment routing information. These protocols are enhanced with Segment Routing extensions to distribute labels. For example, OSPFv2 is extended with Segment Routing extensions defined in RFC 8665.
C . This statement is not entirely correct. While it is true that segment routing does not require the maintenance of a state for each path (LSP), the concept of 'segment routing adjacencies' is a mischaracterization. Segment routing leverages the existing adjacencies formed by the underlying IGP.
D . Label assignments in segment routing are not advertised through LDP (Label Distribution Protocol) updates. Segment routing does away with LDP and instead uses IGP extensions to distribute labels.
Juniper Networks documentation on Segment Routing: Segment Routing Overview
Juniper Networks technical documentation providing guidance on configuring OSPF with Segment Routing extensions.
IETF RFC 8665: OSPF Extension for Segment Routing.
Question 4
Which two statements ate correct about the community BGP attribute on a Junos device? (Choose two.)
Answer : C, D
The community attribute in BGP is an optional transitive attribute. It is not mandatory for BGP operations, but when it is present, it should be passed unchanged to other BGP peers unless explicitly modified by a routing policy. The community attribute is used to group destinations in a certain way, often to apply routing policies to those destinations collectively.
Juniper Networks documentation on BGP communities: BGP Communities Overview
Question 5
What are two types of SlDs used in segment touting? (Choose two.)
Answer : A, B
In segment routing, SIDs (Segment Identifiers) are used to identify different types of segments that can be traversed. A node SID represents an instruction to route a packet to a particular node, and an adjacency SID represents an instruction to route a packet over a specific link or adjacency between two nodes.
Juniper Networks Technical Documentation on Segment Routing
Question 6
Interface ge-0/0/0.0 connecls yout network to your ISP. You want to advertise this interface address as an Internal route In OSPF without creating a neighbor with your ISP.
In this scenario, how is this task accomplished?
Answer : C
When you want to advertise an interface in OSPF but not form an OSPF adjacency over that interface (for example, towards an ISP), you can configure the interface as passive. This will advertise the network on the interface in OSPF without sending OSPF hello packets or forming OSPF neighbor relationships on that interface.
Juniper Networks Technical Documentation on OSPF
OSPF Configuration Guide - Juniper Networks
Question 7
You are asked to configure an LSP which uses the OSPF link state database for path computations. Which two statements are correct in this scenario? (Choose two.)
Answer : A, C
In Junos OS, traffic engineering extensions for OSPF, which are required for an LSP to use the OSPF link state database for path computations, are not enabled by default. They must be explicitly enabled in the OSPF configuration. Therefore, answer C is correct. Answer B is incorrect and contradicts C. The 'no-cspf' command would disable CSPF (Constrained Shortest Path First), which is used for path computations in MPLS traffic engineering, so it should not be used if you want the LSP to utilize OSPF's link state database for path computations. Therefore, answer A is incorrect. The 'policing' parameter is not relevant to enabling traffic engineering extensions in OSPF, so answer D is incorrect.
Juniper Networks documentation on OSPF and Traffic Engineering: Configuring OSPF Traffic Engineering
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