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

The exhibit shows the output of the command  show vlans brief , which displays brief information about VLANs and their associated interfaces 1 .

The output has four columns: Routing instance, VLAN name, Interfaces, and Tagging.

The * symbol indicates that the interface is active, meaning that it is up and forwarding traffic 1 .  This can be verified by the command  show interfaces terse , which displays the status of the interfaces 2 .

On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default 1 2 .  This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN 1 2 . Therefore, option A is correct.

The default VLAN ID can be changed 1 2 .  This allows network administrators to configure the switch to use a different VLAN as the default, if necessary 1 2 . Therefore, option D is correct.

In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers 1 .  The state “2Way” as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers 1 .  This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network 1 .  These neighbors are often referred to as " DRothers " 1 . Therefore, option B is correct.

According to the Juniper documentation 1 , the source and destination addresses of a GRE tunnel interface must be in different subnets. If they are in the same subnet, the router will not be able to route the GRE packets correctly. In the exhibit, the source and destination addresses are both in the 192.168.197.0/24 subnet, which is invalid for GRE tunneling. Therefore, the correct answer is D. References:  Configuring GRE Tunnel Interfaces | Junos OS

An ISO NET address is a type of network address used by the IS-IS routing protocol.  It identifies a point of connection to the network, such as a router interface, and is also called a Network Service Access Point (NSAP) 1 .

An ISO NET address consists of three parts: an area ID, a system ID, and a selector 2 . The area ID identifies the IS-IS area to which the device belongs. The system ID uniquely identifies the device within the area.  The selector identifies a specific service or function on the device, such as routing or management 2 .

An ISO NET address must be unique for each device in the network, because it is used by IS-IS to establish adjacencies, exchange routing information, and compute shortest paths 2 . If two devices have the same ISO NET address, they will not be able to communicate with each other or with other devices in the network. Therefore, it is important to assign different ISO NET addresses to each device in the network.