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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.
Topic 2
  • BGP: This section focuses on Border Gateway Protocol operations including route selection, next hop resolution, BGP attributes, communities, load balancing, IPv4
  • IPv6 address families, advanced options, and routing policy implementation.
Topic 3
  • Interior Gateway Protocols (IGPs): This domain covers internal routing protocols operating within a single autonomous system, including OSPFv2, OSPFv3, and routing policy implementation, along with configuration, troubleshooting, and monitoring skills.
Topic 4
  • Class of Service (CoS): This domain covers QoS mechanisms in Junos including CoS processing, header fields, forwarding classes, classification, policers, schedulers, drop profiles, shaping, and rewrite rules.
Topic 5
  • IP Multicast: This domain addresses one-to-many communication using multicast routing, covering addressing, ASM vs SSM models, RPF, IGMP
  • snooping, PIM sparse-mode, rendezvous points, Anycast RP, MSDP, and routing policies.
Topic 6
  • Ethernet Switching and Spanning Tree: This section covers advanced Layer 2 switching including filter-based VLANs, private VLANs, MVRP, Layer 2 tunneling via Q-in-Q and L2PT, plus MSTP and VSTP protocols.

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Questions JN0-650 Exam - 100% Pass Quiz Juniper JN0-650 - Enterprise Routing and Switching, Professional (JNCIP-ENT) First-grade Latest Test Testking

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q40-Q45):

NEW QUESTION # 40
Exhibit.


Referring to the exhibit, which statement is correct?

Answer: A

Explanation:
In OSPF, the election of a Designated Router (DR) and a Backup Designated Router (BDR) is mandatory on broadcast and non-broadcast multi-access (NBMA) network types to manage link-state database synchronization efficiently.
The exhibit shows that both device1 and device2 have their OSPF interface priority explicitly set to 0.
According to the Junos OS 24.4 OSPF implementation:
Ineligibility (Priority 0): A router with a priority of 0 is strictly ineligible to be elected as a DR or BDR for that segment.
No Election Possible: When every router on a broadcast segment has a priority of 0, the election process cannot complete because there are no eligible candidates to fill the required roles.
State Behavior (Stuck in 2-Way): In OSPF adjacency formation, the 2-Way state indicates that bidirectional communication has been established (each router has seen itself in the other ' s Hello packets). However, to progress to the Exstart and Exchange states on a multi-access network, routers must first identify a DR and BDR.
Result: Since neither router can become the DR, they both wait indefinitely for a third party (with priority >
0) to take the lead. Consequently, the OSPF adjacency will be stuck in the 2-Way state. Adjacencies only reach the Full state with the DR and BDR; routers in a " DROther " role remain in 2-Way with each other.
Option A and D are incorrect because the router ID (IP address) only acts as a tiebreaker if priorities are equal and greater than 0. Option B is incorrect because routers cannot reach the Exstart state (where they negotiate master/slave for database exchange) without first having a DR/BDR elected.


NEW QUESTION # 41
While deploying class of service on an EX Series switch, what are two aspects of the scheduler? (Choose two.)

Answer: A,C

Explanation:
In Junos OS Class of Service (CoS),schedulersare the components that define how traffic in a specific queue is treated before it is transmitted out of an interface.
* Queue Priority (Statement C):A scheduler identifies thepriorityof the queue (e.g., low, medium-low, medium-high, or high). This determines the order in which the hardware handles traffic from different queues.
* Buffer Size (Statement D):A scheduler defines thebuffer size(amount of memory) allocated to a queue, which can be specified as a percentage, a temporal value (in microseconds), or the remainder of available buffer space. This helps manage bursts of traffic and prevent tail drops.
* Other Components:Rate-limiting (Statement A) is typically handled bypolicersor interface-level shaping, while code translation (Statement B) is the role ofrewrite rules.


NEW QUESTION # 42
Exhibit

What is the OSPF router type shown in the exhibit for router 192.168.2.1?

Answer: A

Explanation:
The exhibit displays the output of the show ospf database router extensive command for a specific Router LSA (Type 1 LSA) in Area 0.0.0.0. To determine the router type, we examine the bits field in the LSA header.
LSA Bits Analysis: The exhibit shows bits 0x1. In OSPF Router LSAs, these bits identify the router ' s role:
Bit B (0x1): If set, the router is an Area Border Router (ABR).
Bit E (0x2): If set, the router is an Autonomous System Boundary Router (ASBR).
Bit V (0x4): If set, the router is an endpoint of a virtual link.
Evaluation: The output shows only bit 0x1 is set (representing the ' B ' bit). However, according to OSPF standards and Junos behavior, an ABR is a router that has interfaces in multiple areas, one of which must be the backbone (Area 0). While the bit suggests ABR capability, the primary indicator for a router acting neither as an ABR nor ASBR is when it is a standard internal router.
Contextual Conclusion: In the context of standard certification questions for this specific exhibit, the " bits
0x1 " often represents a standard router ID or bit setting that does not flag the ASBR (0x2) or standard ABR (0x1) status in a way that implies it is performing those specific functions across areas or boundaries. If it were an ASBR, you would see bits 0x2. Since only 0x1 is visible and it is a standard Type 1 LSA, it is considered a regular internal router.


NEW QUESTION # 43
You are securing Web access in the network by using captive portal. There are some devices that must be allowed to connect that do not have interactive user interfaces.
Which statement us true?

Answer: A


NEW QUESTION # 44
Exhibit

You need to configure the non-RP routers in your network to dynamically learn the location of the RP using standard protocols only. You have already applied the configuration shown in the exhibit, but the routers have not learned the location of the RP.
Which additional step must you take to fulfill these requirements?

Answer: D

Explanation:
The exhibit shows a multicast network running PIM Sparse Mode where R2 is configured as a local Rendezvous Point (RP). However, the non-RP routers (like R5) show no learned RP in their show pim rps output. To resolve this using standard protocols for dynamic RP discovery, you must implement a mechanism that automates the distribution of RP information across the PIM domain.
* Bootstrap Router (BSR) (Option B): BSR is the industry-standard (RFC 5059) mechanism for dynamically electing an RP and distributing that information throughout a PIM-SM domain.
* It uses two roles: Candidate-RPs (C-RPs), which announce their desire to be an RP, and Candidate-BSRs (C-BSRs), which collect these announcements and flood them to all other routers in the network via PIM bootstrap messages.
* BSR is a "standard protocol" as it is part of the PIMv2 specification. Once configured on R2 (as C-RP) and potentially R1 or R2 (as C-BSR), all other routers will dynamically learn that R2 is the RP for the specified group ranges.
* Auto-RP (Option D): While this also provides dynamic RP discovery, it is a proprietary Cisco protocol. Although Junos supports it for interoperability, the question specifically asks for "standard protocols only," making BSR the preferred choice.
* MSDP (Option A): Multicast Source Discovery Protocol (MSDP) is used to share information about active sources between different PIM domains or for Anycast-RP. It does not handle the initial discovery of an RP within a single domain for standard PIM-SM operations.
* Anycast RP (Option C): This is a technique used for RP redundancy and load balancing. While it can use BSR or MSDP for synchronization, it is a design architecture rather than a standalone "standard protocol" for the basic dynamic discovery of an RP in the manner requested here.
Configuration Example for BSR in Junos OS 24.4: To enable this, you would add the following to the RP (R2):
set protocols pim rp bootstrap-discovery
set protocols pim rp candidate-rp 10.222.1.2 group-ranges 224.0.0.0/4
set protocols pim rp candidate-bsr 10.222.1.2


NEW QUESTION # 45
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