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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Professional (JNCIP-ENT) Exam |
| Exam Number: | JN0-650 |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 65 |
| Related Certifications: | JNCIE-ENT JNCIA-Junos JNCIS-ENT |
| Exam Price: | $300 USD |
| Passing Score: | 65-75% |
| Exam Format: | Multiple choice, Scenario-based |
| Certificate Validity Period: | 3 years |
| Recommended Training: | Advanced Routing & Switching (ARS) Training |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-650 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Active JNCIS-ENT certification |
| Official Syllabus URL: | https://www.juniper.net/gb/en/training/certification/tracks/enterprise-routing-switching/jncip-ent.html |
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NEW QUESTION # 119
Which two EVPN types advertise an ESI without advertising a MAC address? (Choose two.)
Answer: A,D
Explanation:
EVPN Type 1 (Ethernet Auto-Discovery) and Type 3 (IP Prefix) advertise an ESI (Ethernet Segment Identifier) without including MAC addresses. Type 2 carries MAC/IP bindings, and Type
4 is used for Ethernet A-D route to advertise a IP-to-MAC mapping for remote gateways.
NEW QUESTION # 120
What causes IBGP route flapping in enterprise networks?
Answer: B
Explanation:
In enterprise networks utilizing Junos OS, IBGP (Internal BGP) route flapping is frequently caused by recursive routing failures within the underlying IGP (Interior Gateway Protocol) , such as OSPF or IS-IS.
* Recursive Next-Hop Resolution: Unlike EBGP, where the neighbor is typically directly connected, IBGP neighbors are often several hops away. Consequently, an IBGP route ' s protocol next-hop is usually a loopback IP address that requires a recursive lookup to resolve. The router must consult its unicast routing table (typically inet.0 or inet.3) to find a physical path to that next-hop.
* The Flapping Mechanism: A " flap " occurs when a route is repeatedly withdrawn and readvertised. If the IGP path used to resolve the BGP next-hop becomes unstable or if the BGP route itself is inadvertently used to resolve its own next-hop (a recursive loop), the BGP next-hop becomes unreachable.
* Impact on Routing Table: When the next-hop cannot be resolved, the BGP route is considered invalid and is withdrawn from the routing table. Once the route is withdrawn, the original IGP path to the next- hop often becomes valid again, causing the BGP route to be readvertised . This cycle of withdrawal and readvertisement creates the instability known as flapping.
* Why other options are incorrect: Packet misordering (Option A) and community tagging (Option B) may affect performance or policy but do not cause a route to be withdrawn and readvertised in this cyclical manner. While update intervals (Option C) control how quickly changes are sent, they are not the root cause of the reachability failure that triggers the flap itself.
NEW QUESTION # 121
Which Junos command displays the routes that are being received from a specific BGP neighbor?
Answer: B
NEW QUESTION # 122
Which EVPN route type is used for fast convergence and for advertising the split horizon label?
Answer: D
NEW QUESTION # 123
Which BGP path attribute is used to prevent routing loops when multiple AS are involved in routing?
Answer: A
NEW QUESTION # 124
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