Juniper JN0-363 JNCIS-SP Exam Practice Test Instant Access

Question 1

Which new field is added to an IPv6 header as compared to IPv4?

Aflow label

Bchecksum

Cfragment offset

Dversion

Answer : A

https://www.omnisecu.com/tcpip/ipv6/comparison-between-ipv4-header-and-ipv6-header.php#:~:text=IPv6%20header%20is%20much%20simpler%20than%20IPv4%20header.&text=The%20size%20of%20IPv6%20header,are%20128%20bit%20binary%20numbers.&text=In%20IPv4%20header%2C%20the%20source,are%2032%20bit%20binary%20numbers.

The flow label is a new field added to IPv6 headers that was not present in IPv4 headers. It is used to identify packets that require special handling by routers, particularly for quality-of-service (QoS) purposes. Reference::

IPv6 Header Format, Juniper Networks Documentation

IPv6 Overview, Juniper Networks Documentation

Question 2

What are three well-known mandatory BGP attributes? (Choose three.)

Anext hop

Borigin

Ccommunity

DMED

EAS path

Answer : A, B, E

https://www.catchpoint.com/bgp-monitoring/bgp-attributes

BGP Attribute Categories

There are four categories of BGP attributes:

Well-known mandatory:Recognized by all BGP peers, passed to all peers, and present in all Update messages. Well-known mandatory attributes include:- Next-hop- Origin- AS PATH

Well-known discretionary:Recognized by all routers, passed to all peers, and optionally included in the Update message. Well-known discretionary attributes include:- Local Preference- Atomic Aggregate

Optional transitive:Possibly recognized by BGP routers and passed to BGP peers. Optional transitive attributes are marked as partial when not recognized. Optional transitive attributes include:- Aggregator- Community

Optional non-transitive:Possibly recognized by BGP routers but not passed to peers. Optional non-transitive attributes include:- Multi-exit discriminator (MED)- Originator ID- Cluster-ID

The three well-known mandatory BGP attributes that must be present in every BGP update message are:

Next Hop: Indicates the next hop IP address to reach the advertising BGP peer.

Origin: Indicates how the route was originated, whether it was via IGP, EGP, or incomplete.

AS Path: Lists the autonomous systems that the update has traversed.

Juniper Networks Technical Documentation on BGP Attributes

Question 3

What is the correct order of BGP attributes for active route selection?

Anext hop -> local preference -> AS path -> MED -> origin

Bnext hop -> AS path -> local preference -> origin -> MED

Cnext hop -> local preference -> AS path -> origin -> MED

Dnext hop -> origin -> local preference -> AS path -> MED

Answer : C

BGP selects the active route based on an ordered list of attributes. The correct order is:

Weight (Cisco proprietary, not listed in the options)

Local Preference

Network (route) originated from the BGP router itself

Shortest AS Path

Lowest Origin Type

Lowest MED

eBGP over iBGP paths

Closest IGP Neighbor

Lowest Router ID

The next hop is checked for reachability but is not part of the BGP decision process for selecting the best path.

Juniper Networks Technical Documentation on BGP

Question 4

Which statement is correct about IS-IS?

AIS-IS is a distance vector routing protocol.

BIS-IS is a path vector routing protocol.

CIS-IS is a link-state routing protocol.

DIS-IS is a classful routing protocol.

Answer : C

IS-IS is a link-state routing protocol that uses a Shortest Path First (SPF) algorithm to create a topology map of the network. It floods link-state advertisements (LSAs) to all nodes within the network area to ensure each node has a consistent view of the network topology.

Juniper Networks Technical Documentation on IS-IS

Understanding IS-IS - Juniper Networks

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

The segment touting SRGB start label Is 10,000 and the SRGB index range is 500.

In this scenario, which two statements are correct? (Choose two.)

AThe first usable label is 10,001.

BThe last usable label is 10.501.

CThe last usable label is 10,499.

DThe first usable label Is 10,000.

Answer : A, C

The Segment Routing Global Block (SRGB) defines a range of MPLS labels reserved for segment routing. With an SRGB starting label of 10,000 and an index range of 500, the first usable label is indeed 10,001 because label 10,000 is typically reserved and not used for forwarding. The last usable label would be 10,499 because the range includes 500 labels starting from 10,001.

Juniper Networks documentation on Segment Routing: Segment Routing Overview

Question 7

Click the Exhibit button.

Referring to the exhibit, you have an established RSVP LSP between R1 and R4 when you experience a link failure between R2 and R3.

Which two statements are correct? (Choose two.)

AR2 sends a ResvTear message upstream to R1 signaling the link failure.

BR3 sends a PathTear message downstream to R4 signaling the link failure.

CR2 sends a PathTear message upstream to R1 signaling the link failure.

DR3 sends a ResvTear message downstream to R4 signaling the link failure.

Answer : A, D

Upon a link failure in an RSVP-signaled LSP, the router upstream of the failure (R2) sends a PathTear message upstream to the ingress router (R1), and the router downstream of the failure (R3) sends a ResvTear message downstream to the egress router (R4). These messages signal the failure and initiate tear down of the LSP state in the respective directions. Reference::

RSVP-TE Overview, Juniper Networks Documentation

Understanding RSVP Signal Failures, Juniper Networks Documentation

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