Juniper JN0-363 JNCIS-SP Exam Questions Instant Access

Question 1

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

AA level 1 only router can never form an adjacency with a level 2 only router.

BFor level 2 adjacencies, the area IDs can be different.

CFor level 2 adjacencies, the area IDs must be the same.

DA level 1 only router can form an adjacency with a level 2 only router.

Answer : A, B

A Level 1 router can become adjacent with the Level 1 and Level 1-2 (L1/L2) router. A Level 2 router can become adjacent with Level 2 or Level 1-2 (L1/L2) router. There is no adjacency between L1 only and L2 only router. HOWEVER: If two routers are in different areas, they can only form a Level 2 adjacency. As such, two routers in different areas can NOT form a Level 1 adjacency. If you want two routers to form a Level 1 adjacency, they have to be in the same area.

IS-IS (Intermediate System to Intermediate System) operates at two levels: Level 1 and Level 2. Level 1 routers are only aware of their own area's topology, while Level 2 routers have knowledge of the topology across areas. A Level 1 router cannot form an adjacency with a Level 2 router unless the Level 2 router is also operating as a Level 1 router (Level 1-2 router). Level 2 routers can form adjacencies regardless of their area IDs because Level 2 operates at the domain level and is used to interconnect different IS-IS areas.

Juniper Networks Technical Documentation on IS-IS

IS-IS Levels and Areas Explanation - Juniper Networks

Question 2

Exhibit

S Exhibit

LSI1 A AS 65501

ISPB AS 65502

Advertised Prefixes: 172.20.0.0/24 172.20.20.0/24 172.20.21.0/24

\ N

Advertised Prefixes: 172.20.0.0/24

172.20.1.0/24

Referring to the exhibit, which two statements are correct? (Choose two.)

ADevices in AS 65512 will prefer ISP A for traffic destined to the 172.20.21.0/24 network.

BDevices In AS 65512 will prefer ISP A for traffic destined to the 172.20.0.0/24 network.

CDevices in AS 65512 will prefer ISP B for traffic destined to the 172.20.21.0/24 network.

DDevices In AS 65512 will prefer ISP B for traffic destined to the 172.20.0.0/24 network.

Answer : A, B

Local preference is a BGP attribute that dictates which path is preferred when multiple paths to the same destination are available. A higher local preference is preferred over a lower one. Since ISP A (AS 65501) is advertising a local preference of 100 and ISP B (AS 65502) is advertising a local preference of 200 to AS 65512, traffic from devices in AS 65512 will prefer the path via ISP B for all networks that ISP B advertises. However, since ISP A advertises the 172.20.21.0/24 network and ISP B does not, traffic for 172.20.21.0/24 will go through ISP A. For the 172.20.0.0/24 network, which both ISPs advertise, devices in AS 65512 will prefer the path via ISP B due to the higher local preference.

Juniper Networks documentation on BGP attributes: BGP Attributes and Policy

Question 3

Which two LSA types are permuted in OSPF totally stubby areas? (Choose two.)

AType 1

BType 3

CType 5

DType 7

Answer : B, C

In OSPF, a totally stubby area does not permit type 3 summary LSAs (inter-area routes) or type 5 external LSAs (routes from outside the OSPF domain) to be flooded into the area. The area border router (ABR) will only send a default route as a type 3 LSA into the totally stubby area.

Juniper Networks documentation on OSPF Areas: Understanding OSPF Areas

Question 4

Exhibit.

Referring to the exhibit, you have configured an aggregate route that represents the 172.21.0.0/24, 172.21.1.0/24, and 172.21.2.0/24 networks. However, when you view the routing table, your new route hidden.

Which action would you perform to determine the problem?

AVerify that you have active contributing routes on the device.

BVerify that you have configured a policy on the device to accept aggregate routes.

CVerify that you have defined a metric value for the aggregate route.

DVerify that you have set the preference to a lower default value.

Answer : D

The exhibit shows an aggregate route configuration for the network 172.21.0.0/22, which would summarize the specific networks 172.21.0.0/24, 172.21.1.0/24, and 172.21.2.0/24. For an aggregate route to be active, it must have contributing routes in the routing table. If the route is hidden, it usually means there are no contributing routes that are active or the policy applied to the aggregate does not match any of the specific routes. Therefore, the first step in troubleshooting would be to verify that there are indeed active contributing routes for the aggregate to be valid.

Juniper documentation on routing policies and aggregates: Junos OS Routing Policies, Firewall Filters, and Traffic Policers User Guide

Question 5

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

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

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

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

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

Answer : B, D

metric---Metric value. Range: 1 through 63, or 1 through 16,777,215 (if you have configured wide metrics) Default: 10 (for all interfaces except lo0), 0 (for the lo0 interface)

Question 6

Which statement is correct about the FE80;:/10 prefix?

AThis prefix range is used for the link local address.

BThis prefix range is used on the loopback interface.

CThis prefix range is reserved for multicast applications

DThis prefix range is not reserved.

Answer : A

The FE80::/10 prefix is reserved for IPv6 link-local addresses. These addresses are auto-configured on all IPv6-enabled interfaces and can be used for communication within the local link (subnet) only.

Juniper Networks Technical Documentation on IPv6 Addressing

Question 7

Exhibit

You are asked to assign interface xe-1/0/5 to a virtual switch.

What must be accomplished to complete the configuration?

AInterface xe-1/0/5 must be added to routing-instance sw-1 vlan_2.

BInterface xe-1/0'5 must be a trunk port.

CInterface xe-1/0/5 must be added to routing-instance sw-1.

DAn IRB interface must be configured to routing-instance sw-1 vlan_2.

Answer : A

The exhibit shows the configuration of a virtual switch called sw-1 with two VLANs defined within it: vlan_1 with VLAN ID 1 and vlan_2 with VLAN ID 2. To add interface xe-1/0/5 to the virtual switch, the interface must be associated with one of these VLANs. Since the interface is already configured with vlan-id 2, it implies that it is intended to be part of vlan_2 within the virtual switch sw-1. Therefore, the correct answer is to add interface xe-1/0/5 to the vlan_2 bridge domain under the sw-1 routing instance.

Juniper documentation on virtual switches: Junos OS Routing Instances Overview

Juniper Service Provider Routing and Switching, Specialist JN0-363 JNCIS-SP Exam Questions