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Juniper JN0-650 Exam Syllabus Topics:

Topic
Details

Topic 1

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 2

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 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

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 5

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 (Q28-Q33):

NEW QUESTION # 28
What is the function of BGP's MED attribute?

A. To define the best path to external autonomous systems.
B. To prevent routing loops by modifying the AS_PATH attribute.
C. To determine the best path for traffic leaving the autonomous system.
D. To influence the incoming traffic from neighboring autonomous systems.

Answer: D

NEW QUESTION # 29
Which two statements are true regarding LLDP updates for device discovery? (Choose two.)

A. LLDP establishes a two-way session with neighbors.
B. LLDP sends secure advertisements.
C. LLDP sends one-way advertisements.
D. LLDP sends unsecure advertisements.

Answer: C,D

NEW QUESTION # 30
Which protocol must you enable to tunnel Layer 2 protocols, such as RSTP or LLDP, across a Q-in-Q tunnel?

A. L2PT
B. LDAP
C. L2TP
D. MVRP

Answer: A

NEW QUESTION # 31
Exhibit

Referring to the exhibit output, which statement is correct?

A. The output shows the router ID of the device sending the EVPN Type 2 routes
B. IP addresses 10.1.1.1 and 10.1 2.3 are connected to the same VNI.
C. The output shows the route distinguisher of the device sending the EVPN Type 2 routes
D. The device with an IP address of 192.168.100 2 is attached to VNI 5010

Answer: C

Explanation:
The exhibit displays the default-switch.evpn.0 routing table, which is used on Juniper leaf devices to store EVPN Type 2 (MAC/IP) routes.
* Route Distinguisher (Option C): In EVPN, the Route Distinguisher (RD) is an 8-byte prefix added to a route to make it unique within the BGP control plane. The RD format in the exhibit is <IP- Address>:<Identifier>.
* For example, the prefix 2:192.168.100.1:1::5010::... indicates an EVPN Type 2 route (2:) where
192.168.100.1:1 is the Route Distinguisher.
* This RD identifies the specific routing instance on the originating VTEP that advertised the MAC
/IP address.
* Option A is incorrect: The RD 192.168.100.2:1 does not necessarily mean the host device has that IP; it means the originating switch has that router ID/IP used for its RD.
* Option B is incorrect: While the RD often incorporates the router ID, the RD itself is the full string (e.
g., 192.168.100.1:1), which is distinct from the raw Router ID used in the BGP summary.
* Option D is incorrect: Looking at the entries for 10.1.1.1 and 10.1.2.3, they are associated with different identifiers in the RD strings (5010 and 5020 respectively), which typically map to different VNIs or bridge domains.

NEW QUESTION # 32
You must implement EVPN signaling on an EX Series device that is configured with both underlay and overlay networks. Which network protocol accomplishes this task?

A. EBGP overlay network
B. MPLS overlay network
C. IS-IS underlay network
D. OSPF underlay network

Answer: A

Explanation:
In an EVPN-VXLAN architecture, the network is divided into two distinct planes: the Underlay and the Overlay.
* Underlay (IP Fabric): The underlay's only job is to provide IP reachability between the loopback addresses of all VTEPs (Virtual Tunnel Endpoints). This is typically achieved using OSPF, IS-IS, or EBGP.
* Overlay (EVPN Control Plane): The overlay is responsible for carrying Layer 2 MAC and Layer 3 IP reachability information between switches. EVPN signaling is the standard mechanism for this task.
* Protocol Choice (Option D): EVPN uses MP-BGP (Multiprotocol BGP) as its control plane protocol. On Juniper EX Series and QFX Series switches, the most scalable and recommended design for the overlay is EBGP (External BGP).
* In a 3-stage or 5-stage Clos architecture, EBGP is used in the overlay to exchange EVPN routes (Route Types 1-5) between Leaf and Spine switches.
* EBGP simplifies configuration by avoiding the need for Route Reflectors (required for IBGP) and provides better control over route propagation through BGP community and policy management.
Incorrect Options:
* Options A and B refer to the underlay protocols. While they provide the path for the VXLAN tunnels, they do not handle the EVPN signaling itself.
* Option C (MPLS) is a different transport technology. While EVPN can run over MPLS (EVPN- MPLS), campus designs on EX series devices specifically use VXLAN as the data plane, making EBGP the standard signaling protocol for the EVPN-VXLAN overlay.

NEW QUESTION # 33
......

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