Juniper JN0-351 - Enterprise Routing and Switching Specialist (JNCIS-ENT)

The configuration shown in the exhibit is an example of a routing instance of type virtual-router.  A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device 1 .  A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table 2 .

The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table.

In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table. This means that the routes from inet.0 will be imported into ispi.inet.0.

Therefore, the correct answer is B. The inet.0 route table will be imported into the ispi.inet.0 route table.

A  is correct because the interface is configured as a disabled port. A disabled port does not forward any traffic, including DHCP packets.  Therefore, DHCP snooping cannot learn any MAC addresses or lease information from a disabled port 1 .

C  is correct because the interface is configured as a trunk port.  By default, all trunk ports on the switch are trusted for DHCP snooping 2 . This means that DHCP snooping does not inspect or filter any DHCP packets received on a trunk port.  Therefore, DHCP snooping does not add any entries to the snooping database for a trunk port 2 .