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

IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network 1 2 .  It supports multiple protocol topologies, including IPv4, IPv6, and multicast 1 2 . Therefore, options C, E, and D are correct.

Option B is correct.  Filter-based forwarding (FBF), also known as Policy Based Routing (PBR), uses the forwarding routing instance type 1 2 .

Option C is correct.  Routing Information Base (RIB) groups are used to copy routes from one routing table to another 3 4 .  In the context of FBF, RIB groups can be used to copy routes from the inet.0 routing table 3 4 .

Option A is incorrect.  FBF does not use the no-forwarding routing instance type 1 5 .

Option D is incorrect.  RIB groups are not used to hide routes in the inet.0 routing table 3 4 .  They are used to share or copy routes between different routing tables 3 4 .

The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.  This can be resolved by redistributing the connected subnets into OSPF 1 .

Option C suggests to configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.  This is correct because redistribution allows routes from one routing protocol to be communicated to another, and in this case, it allows the connected subnets to be advertised through OSPF 1 .

Option D suggests enabling the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.  This is also correct because in OSPF, a passive interface is an interface that belongs to the OSPF router, but does not send OSPF Hello packets 1 .  It’s typically used on an interface that you don’t want to use for OSPF adjacencies, but you still want to advertise its IP address 1 . Therefore, enabling passive interface can help in advertising the Dallas and Denver subnets.

According to the Juniper documentation1, when a switch receives a unicast frame destined to a MAC address that is not registered in the bridging table, it floods the frame out all ports that are part of the same VLAN, except the receiving port. This is the default behavior of a switch when it does not know the destination MAC address. The switch does not perform an ARP request, send an error message, or flood the frame to all VLANs. References: Understanding Unicast Flooding | Junos OS | Juniper Networks