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Juniper JN0-650 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	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 3	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 4	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.
Topic 5	Layer 2 Authentication and Access Control: This domain examines network access control mechanisms including 802.1x, MAC RADIUS, captive portal, server fail fallback, guest VLANs, and multi-method authentication considerations.
Topic 6	IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP LLDP-MED protocols, and voice VLAN implementation.
Topic 7	EVPN: This section addresses Ethernet VPN technology for Layer 2 over Layer 3 connectivity, covering EVPN route types, VXLAN encapsulation, and multi-homing configurations.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q89-Q94):

NEW QUESTION # 89
Click the Exhibit button.

You are receiving the 203.0.113.0/24 route from both upstream ISPs. You are asked to ensure that ISP A is the preferred ISP for traffic being sent to the 203.0.113.0/24 network from devices in AS 65512.
Referring to the exhibit, which two statements will accomplish this behavior? (Choose two.)

A. You should assign a local preference that is higher than 100 for the route learned from ISP A.
B. You should assign a local preference that is lower than 100 for the route learned from ISP B.
C. You should assign a local preference that is lower than 100 for the route learned from ISP A.
D. You should assign a local preference that is higher than 100 for the route learned from ISP B.

Answer: A,B

Explanation:
To make ISP A the preferred path for traffic to 203.0.113.0/24, you can increase the local preference for the route learned from ISP A or decrease the local preference for the route learned from ISP B. Higher local preference values are preferred within an AS.

NEW QUESTION # 90
Click the Exhibit button.

Referring to the exhibit, which two statements are correct? (Choose two.)

A. DS-1 will be the root bridge for MSTI 1.
B. RSTP will be used to generate the CST.
C. DS-1 will be the root bridge for MSTI 2.
D. MSTP will not converge.

Answer: A,B

Explanation:
MSTP uses RSTP behavior to build the common spanning tree for the MST region, providing rapid convergence for the CST.
DS-1 has the lower bridge priority for MSTI 1, so it will become the root bridge for that MST instance.

NEW QUESTION # 91
Which two statements are correct about EVPN/VXLAN deployments? (Choose two.)

A. The VLAN tags are removed before traffic is sent through the IP fabric.
B. The VLAN tags associated with source and destination ports for a given flow are not required to match.
C. The VLAN tags are maintained when traffic is sent through the IP fabric.
D. The VLAN tags associated with source and destination ports for a given flow must match.

Answer: A,B

Explanation:
In EVPN/VXLAN deployments, the original VLAN tag is removed before traffic is encapsulated and transported across the IP fabric using VXLAN.
Because VXLAN uses VNIs to identify Layer 2 segments across the fabric, the VLAN IDs on the source and destination access ports do not need to match.

NEW QUESTION # 92
A modified deficit round-robin scheduler is defined by which two variables? (Choose two.)

A. Layer 2 fields
B. Layer 3 fields
C. transmit rate
D. buffer size

Answer: C,D

Explanation:
In Junos OS Class of Service (CoS), a scheduler is the mechanism used to assign resources to the various egress queues on an interface. Specifically, when utilizing a modified deficit round-robin (MDRR) or weighted round-robin algorithm to service these queues, the scheduler ' s behavior is defined by two primary variables:
* Transmit Rate (Option A): This variable defines the minimum guaranteed bandwidth for a queue.
In the context of a deficit round-robin algorithm, the transmit rate serves as the weight for the queue.
Queues with higher transmit rates receive a larger " quantum " of data they can send during each round- robin cycle compared to queues with lower rates.
* Buffer Size (Option C): This variable defines the amount of memory (buffer space) allocated to the queue. It ensures that the queue can hold a certain amount of delayed traffic during periods of congestion to prevent immediate packet drops. The buffer size can be configured as a percentage of the total interface buffer or as a temporal value.
Why other options are incorrect:
* Layer 2 and Layer 3 fields (Options B & D): These fields are utilized by classifiers (Behavior Aggregate or Multifield) to identify and group traffic into forwarding classes. They are used before the scheduling process begins and do not define the resource allocation of the scheduler itself.

NEW QUESTION # 93
Exhibit

Referring to the exhibit, which two statements are correct? (Choose two.)

A. During times of sustained network congestion, traffic that is placed in queue 2 will be dropped if more than 10% of the interface bandwidth is used
B. The bandwidth reservation for queue 0 is 76%.
C. The bandwidth reservation for queue 0 is 100%.
D. During times of no network congestion, traffic that is placed in queue 2 will be dropped if more than
10% of the interface bandwidth is used

Answer: B,D

Explanation:
The exhibit shows the Class of Service (CoS) transmit queue information for interface ge-0/0/11. To determine the correct behavior, we must analyze the bandwidth allocations and the queue limit settings:
Bandwidth Calculation (Option A): In Junos OS, when multiple queues are assigned specific percentages of bandwidth, the " remainder " (represented by ' r ' ) is the total interface bandwidth minus the sum of the explicitly configured percentages.
Bandwidth assigned to Queue 1 (EF) = 10%.
Bandwidth assigned to Queue 2 (AF) = 10%.
Bandwidth assigned to Queue 3 (NC) = 4%.
Total explicitly assigned = $10\% + 10\% + 4\% = 24\%$.
Remainder for Queue 0 (Best Effort) = $100\% - 24\% = 76\%$.
" Limit: exact " Behavior (Option B): The exhibit shows that Queue 2 (assured-forwarding) has a Limit set to exact.
By default, a queue in Junos can consume more than its allocated bandwidth if other queues are idle.
However, when the exact keyword is applied to the transmit-rate (transmission rate), the queue is strictly rate- limited to its configured percentage.
This means that traffic in Queue 2 will be capped at 10% of the interface bandwidth regardless of whether the network is congested or not. If the traffic exceeds 10%, the excess will be dropped or buffered to match the exact rate.
Option C is incorrect because 100% of the bandwidth is not reserved for a single queue; it is distributed across four queues.
Option D is less accurate than B because it implies the drop behavior only occurs during congestion. The exact parameter enforces the limit even when the rest of the interface is completely idle.

NEW QUESTION # 94
......

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