Juniper JN0-351 Practice Test - Questions Answers, Page 7

In a Rapid Spanning Tree Protocol (RSTP) topology, the root bridge is determined by the switch with the lowest bridge priority value12.If all switches have the same priority, then the root bridge is assigned to the switch whose MAC address's hex value is the lowest2.The default bridge priority value is 3276832. However, without the actual exhibit, it's difficult to definitively determine which device is the root bridge.But based on the options provided, if we assume that the local device has a lower bridge priority or a lower MAC address than other devices in the network, then it could be considered as the root bridge for this RSTP topology45.

Aggregate routes are used for advertising summarized network prefixes12.They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1.This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.

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 protocols1.

Aggregate routes are not automatically generated for all of the subnets in a routing table.They need to be manually configured1.

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 route1.

A) On R1, enable Level 1 on the ge-0/0/1 interface.In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1.Level 1 systems route within an area2.If the destination is outside an area, Level 1 systems route toward a Level 2 system2. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.

D) On R3 enable Level 1 on the ge-0/0/4 interfaceSimilarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3.

These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1and Cisco34.

In this scenario, you should create anaggregate route1.Aggregate routes are used for advertising summarized network prefixes1.They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1.This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.

Therefore, option A is correct. Options B, C, and D are not correct because:

Static route using the resolve feature: This type of route uses the resolve feature to install a static route in the routing table only if a specific condition is met1. However, it does not provide the capability to summarize multiple routes into a single prefix.

Generate route: This type of route generates a route that is always present in the routing table and can be used to summarize routes.However, it does not have the capability to only advertise the route when specific BGP routes are being received from a neighbor1.

Static route using qualified next hops: This type of route allows for the specification of multiple next-hop addresses for a static route1. However, it does not provide the capability to summarize multiple routes into a single prefix.