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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam |
| Exam Number: | JN0-351 |
| Exam Duration: | 90 minutes |
| Passing Score: | Not publicly disclosed (approx. 65%-70%) |
| Exam Format: | Multiple Choice |
| Real Exam Qty: | 65 |
| Exam Price: | $200 USD |
| Related Certifications: | JNCIA-Junos JNCIE-ENT JNCIP-ENT |
| Available Languages: | English |
| Certificate Validity Period: | 3 years |
| Recommended Training: | Juniper Learning Portal |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-351 Sample Questions |
| Exam Way: | Online proctored or onsite testing center (Pearson VUE) |
| Pre Condition: | Valid JNCIA-Junos certification |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html |
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NEW QUESTION # 186
Which two statements describe NSR? (Choose two.)
Answer: A,B
NEW QUESTION # 187
Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?
Answer: D
NEW QUESTION # 188
Which statement is correct about IP-IP tunnels?
Answer: D
Explanation:
Explanation
IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels only support encapsulating IP traffic, which means that the payload of the inner packet must be an IP packet. IP-IP tunnels cannot encapsulate non-IP traffic, such as Ethernet frames or MPLS labels1.
Option A is correct, because IP-IP tunnels only support encapsulating IP traffic. Option B is incorrect, because IP-IP tunnels only support encapsulating non-IP traffic. Option C is incorrect, because the TTL in the inner packet is not decremented during transit to the tunnel endpoint. The TTL in the outer packet is decremented by each router along the path, but the TTL in the inner packet is preserved until it reaches the tunnel endpoint2.
Option D is incorrect, because there are 20 bytes of overhead with IP-IP encapsulation. The overhead consists of the header of the outer packet, which has a fixed size of 20 bytes for IPv43.
References:
1: IP-IP Tunneling 2: What is tunneling? | Tunneling in networking 3: IPv4 - Header
NEW QUESTION # 189
Which statement about aggregate routes is correct?
Answer: B
Explanation:
Aggregate routes are used for advertising summarized network prefixes. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route.
Therefore, option D is correct. Options A, B, and C are not correct because:
Aggregate routes can be used with both static routing and dynamic routing protocols. Aggregate routes are not automatically generated for all of the subnets in a routing table. They need to be manually configured.
Aggregate routes are not always preferred over more specific routes. The route selection process in Junos OS considers several factors, including route preference and metric, before determining the active route.
NEW QUESTION # 190
Exhibit.
You want to enable redundancy for the EBGP peering between the two routers shown in the exhibit. Which three actions will you perform in this scenario? (Choose three.)
Answer: C,D,E
Explanation:
* A is correct because you need to configure BGP multihop to enable redundancy for the EBGP peering between the two routers. BGP multihop is a feature that allows BGP peers to establish a session over multiple hops, instead of requiring them to be directly connected 1 . By default, EBGP peers use a time- to-live (TTL) value of 1 for their packets, which means that they can only reach adjacent neighbors 1
. However, if you configure BGP multihop with a higher TTL value, you can allow EBGP peers to communicate over multiple routers in between 1 . This can provide redundancy in case of a link failure or a router failure between the EBGP peers.
* B is correct because you need to configure loopback interface peering to enable redundancy for the EBGP peering between the two routers. Loopback interface peering is a technique that uses loopback interfaces as the source and destination addresses for BGP sessions, instead of physical interfaces 2
. Loopback interfaces are virtual interfaces that are always up and reachable as long as the router is operational 2 . By using loopback interface peering, you can avoid the dependency on a single physical interface or link for the BGP session, and use multiple paths to reach the loopback address of the peer 2
. This can provide redundancy and load balancing for the EBGP peering.
* C is correct because you need to configure routes for the peer loopback interface IP addresses to enable redundancy for the EBGP peering between the two routers. Routes for the peer loopback interface IP addresses are necessary to ensure that the routers can reach each other's loopback addresses over multiple hops 2 . You can use static routes or dynamic routing protocols to advertise and learn the routes for the peer loopback interface IP addresses 2 . Without these routes, the routers will not be able to establish or maintain the BGP session using their loopback interfaces.
NEW QUESTION # 191
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