Free Juniper JN0-364 Exam Dumps October 2026

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Question No: 1

Exhibit:

user@R10> show configuration protocols isis

interface ge-0/0/1.0 {

point-to-point;

}

interface ge-0/0/2.0 {

point-to-point;

}

interface lo0.0;

source-packet-routing {

srgb start-label 300000 index-range 10000;

}

level 1 disable;

level 2 wide-metrics-only;

reference-bandwidth 100g;

You have a network of ten routers that have all been configured with an identical SRGB. The exhibit shows the IS-IS configuration from a router called R10. The other nine routers do not yet have an IPv4 shortest-path SR-MPLS LSP to this router. Which missing part of the configuration must you add on R10 to solve this problem?

AR10 must be configured with an explicit binding SID.

BR10 must be configured with explicit IPv4 adjacency SID.

CR10 must tag its internal IPv4 BGP prefixes with a BGP prefix SID.

DR10 must be configured with an explicit IPv4 node SID.

Show Answer

Suggested Answer: D Explanation:

In a Segment Routing (SR-MPLS) architecture using IS-IS as the control plane, routers exchange labels (segments) to build Label-Switched Paths (LSPs) without the need for traditional signaling protocols like LDP or RSVP. According to Juniper Networks technical documentation, for a router to be reachable via a shortest-path LSP from other nodes in the network, it must advertise a Prefix Segment Identifier (Prefix SID).

A specific type of Prefix SID is the Node SID, which is assigned to a loopback address (typically lo0.0) to uniquely identify the router within the SR domain. In the provided exhibit, router R10 has been configured with a Segment Routing Global Block (SRGB) starting at label 300000. This configuration tells the router which label range to use for global segments, but it does not automatically assign a label to its own loopback interface.

Without a Node SID configuration, R10 is not telling its neighbors which specific index or label within that SRGB corresponds to its own address. Consequently, the other nine routers in the IS-IS area can calculate the shortest path to R10 using standard SPF, but they cannot perform the 'label-binding' necessary to push an SR-MPLS label onto the packets.

To solve this, a Node SID must be explicitly configured under the loopback interface within the IS-IS protocol hierarchy, such as:

set protocols isis interface lo0.0 level 2 ipv4-node-sid index <value>

Analysis of incorrect options:

Binding SID (Option A): This is used to encapsulate or steer traffic into a specific policy or tunnel (like a TE-LSP) and is not required for basic shortest-path reachability.

Adjacency SID (Option B): These are generated automatically by Junos for each link and represent a specific local hop; they are not used for global 'shortest-path' forwarding to a distant node.

BGP Prefix SID (Option C): This is used for BGP Egress Peer Engineering (EPE) or prefix advertisement via BGP, which is not relevant for building the underlying IS-IS SR-MPLS transport.

Therefore, configuring an explicit IPv4 node SID is the mandatory step to enable the rest of the network to build a shortest-path SR-LSP toward R10.

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