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Juniper JN0-351 Exam Syllabus Topics:

SectionObjectives
Topic 1: Layer 2 Security- Port security implementation
- DHCP snooping
- Common Layer 2 attack mitigation
- Dynamic ARP inspection
Topic 2: BGP- BGP configuration and troubleshooting
Topic 3: OSPF- OSPF configuration and troubleshooting
Topic 4: Spanning Tree Protocol- Convergence issues identification
- Port roles interpretation
- Loop prevention and redundancy
- Bridge priority and port cost optimization
- STP topology design and troubleshooting
Topic 5: IS-IS- IS-IS configuration and troubleshooting
Topic 6: High Availability- High availability design and integration
- VRRP and redundancy protocols
Topic 7: Layer 2 Switching or VLANs- Configuration, monitoring, and troubleshooting
- Ports and tagging
- Frame processing
- Bridging components
- Native VLANs and voice VLANs
- VLAN concepts and functionalities
- Inter-VLAN routing
Topic 8: Protocol Independent Routing- Routing fundamentals
Topic 9: Tunnels- Tunnel technologies

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q46-Q51):

NEW QUESTION # 46
Which three actions are required for filter-based forwarding? (Choose three.)

Answer: A,C,D


NEW QUESTION # 47
Referring to the exhibit, the local router should have an IS-IS adjacency with a neighboring router, but the adjacency never establishes correctly.

What should you do to solve the problem?

Answer: D


NEW QUESTION # 48
Which statement about aggregate routes is correct?

Answer: A

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 # 49
You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network.
What two statements are correct in this scenario? (Choose two.)

Answer: B,D

Explanation:
BGP is a routing protocol that operates between autonomous systems (AS). An AS is a group of routers under a single administrative control. BGP can be classified into two types: internal BGP (IBGP) and external BGP (EBGP). IBGP is the BGP communication between routers within the same AS, while EBGP is the BGP communication between routers in different AS. BGP uses the AS_PATH attribute to record the AS numbers that the route has passed through, and uses it to prevent routing loops and select the best path.
In this scenario, you want to add a second ISP connection and remove the default route to the existing ISP.
This means that you want to have more control over the routing decisions and use BGP to exchange routes with both ISPs. To do this, you need to deploy the BGP protocol in your network and configure both IBGP and EBGP sessions. The correct statements about BGP in this scenario are:
* IBGP peers advertise routes received from EBGP peers to other IBGP peers. This is the default behavior of IBGP, as it allows the routers within the same AS to learn the routes from different EBGP peers and select the best exit point. However, IBGP has a rule that it does not advertise routes received from IBGP peers to other IBGP peers, to avoid creating routing loops. Therefore, option B is correct and option C is incorrect. To overcome this rule, IBGP requires a full mesh topology, where every IBGP router is directly connected to every other IBGP router, or a route reflector or confederation design, where some IBGP routers act as intermediaries to reflect or aggregate the routes to other IBGP routers.
* EBGP peers advertise routes received from IBGP peers to other EBGP peers. This is the default behavior of EBGP, as it allows the routers in different AS to exchange routes and reachability information. However, EBGP has a rule that it does not advertise routes received from EBGP peers to other EBGP peers, to avoid creating routing loops. Therefore, option D is correct and option A is incorrect. To overcome this rule, EBGP uses the AS_PATH attribute to filter out the routes that contain its own AS number, or uses route maps or policies to control the route advertisement. IBGP does not update the next-hop attribute to ensure reachability within an AS, as the next-hop attribute is preserved by IBGP. Instead, IBGP relies on an underlying IGP (Interior Gateway Protocol) to provide reachability to the next-hop.
References: Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks , BGP Fundamentals > BGP Overview | Cisco Press , BGP Essentials: The Protocol - Pluralsight


NEW QUESTION # 50
Which two statements are correct about Rapid Spanning Tree Protocol (RSTP)? (Choose two.)

Answer: B,C

Explanation:
Rapid Spanning Tree Protocol (RSTP), defined in IEEE 802.1w, significantly improves convergence time over traditional 802.1D STP by introducing new port roles, including alternate ports (providing an alternate path to the root) and backup ports (providing a backup path to a segment). RSTP is also backward compatible and can interoperate with legacy 802.1D STP switches.


NEW QUESTION # 51
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