Juniper JN0-363 Exam Dumps

Question 6 of 66

How does a Junos device learn about MAC addresses when it is first connected to an Ethernet LAN?

The device sends out a network multicast message asking for all devices and MAC addresses on the network and stores this information in addition to the interface from which the response was received.

The device sends out a network broadcast message asking for all devices and MAC addresses on the network and stores this information in addition to the interface from which the response was received.

The device learns the destination MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

The device learns the source MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

Correct Answer: D

A Junos device learns about MAC addresses when it is first connected to an Ethernet LAN by listening to the traffic on each of its interfaces. As traffic flows through the device, it observes the source MAC addresses of the frames arriving on each interface. The Junos device then associates each MAC address it observes with the specific interface from which it received the traffic. This information is stored in the Ethernet switching table (also known as the MAC address table) of the device. By observing the source MAC addresses in the incoming frames, the device builds its understanding of which MAC addresses are reachable via which interfaces.

Question 7 of 66

Which two statements are correct about IS-IS interface metrics? (Choose two.)

By default, an IS-IS interface has a maximum metric value of 1023.

Wide metrics enable IS-IS interface to have a maximum metric value of around 16 million.

Wide metrics enable an IS-IS interface to have a maximum metric value of 1023.

By default, an IS-IS interface has a maximum metric value of 63.

Correct Answer: B, D

By default, an IS-IS interface has a maximum metric value of 63. When wide metrics are configured, an IS-IS interface can have a maximum metric value of around 16 million. These configurations enable IS-IS to handle larger networks and more complex topologies by allowing for higher metric values.

Question 8 of 66

Which two statements are correct about BGP? (Choose two.)

IBGP neighbors must use the same AS number.

By default, the TTL on product-related packets for external neighbors is set to 1.

EBGP neighbors must use the same AS number.

By default, the TTL on protocol-related packets for internal neighbors is set to 1.

Correct Answer: A, D

IBGP neighbors must use the same AS number because they are within the same autonomous system. By default, the TTL on protocol-related packets for internal neighbors (IBGP) is set to 1 to help prevent BGP packets from traveling beyond the local autonomous system.

Question 9 of 66

Click the Exhibit button.

Referring to the exhibit, what will happen to untagged frames?

The untagged frames are associated with VLAN 10.

The untagged frames are dropped.

The untagged frames are load balanced between VLAN 10 and VLAN 20.

The untagged frames are associated with VLAN 20.

Correct Answer: D

The interface configuration includes the command 'native-vlan-id 20', which indicates that untagged frames received on this interface will be associated with VLAN 20. In a trunk configuration, the native VLAN is used to handle untagged traffic.

Question 10 of 66

An OSPF router does not have a router ID configured.

In this scenario, which statement is correct about the router ID?

The Junos OS will use the IP address assigned to the interface with the lowest MAC address.

The Junos OS will use the IP address assigned to the loopback interface for the router ID.

A router ID will not be assigned until it is manually configured.

The Junos OS will use the IP address assigned to the interface with the highest priority.

Correct Answer: B

In OSPF configuration on Junos OS, if a router ID is not explicitly configured, the router will use the IP address assigned to the loopback interface as the router ID. If there is no loopback interface configured, then the highest IP address assigned to any active physical interface will be used.