JN0-352 Exam Actual Questions - Examcollection JN0-352 Questions Answers

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Juniper JN0-352 Exam Syllabus Topics:

Section	Objectives
Topic 1: BGP	- Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types
Topic 2: IS-IS	- Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting
Topic 3: High Availability	- Virtual chassis and graceful restart - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD
Topic 4: OSPF	- Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors
Topic 5: Tunnels	- IP tunneling concepts - GRE and IP-IP configuration and troubleshooting
Topic 6: Layer 2 Switching and VLANs	- Frame processing - Bridging components - Inter-VLAN routing - Native VLANs and voice VLANs - Ports and VLAN tagging
Topic 7: Layer 2 Security	- Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters - BPDU, loop and root protection - MACsec and storm control
Topic 8: Protocol-Independent Routing	- Static, aggregate, generated routes - Load balancing and filter-based forwarding - Martian addresses and RIB groups
Topic 9: Spanning Tree	- Convergence and reconvergence - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs)

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q42-Q47):

NEW QUESTION # 42
Which command solves the error that you see in the exhibit?

A. delete ge-0/0/2 unit 0 family ethernet-switching vlan members all
B. delete ge-0/0/2 unit 0 family ethernet-switching vlan members default
C. set ge-0/0/2 unit 0 family ethernet-switching vlan members all
D. set ge-0/0/2 unit 0 family ethernet-switching vlan members [default v11]

Answer: B

Explanation:
The error in the exhibit occurs because an access interface can only be a member of one VLAN, but it is currently configured with the "default" VLAN and is trying to be added to VLAN "v11." To resolve the issue, the correct command is:
delete ge-0/0/2 unit 0 family ethernet-switching vlan members default
This command removes the interface from the "default" VLAN, allowing it to be part of VLAN
"v11" as intended.

NEW QUESTION # 43
What are two purposes of an aggregate route? (Choose two.)

A. to allow external peers to see internal routes
B. to hide internal routes from external peers
C. to decrease the number of route advertisements
D. to increase the number of route advertisements

Answer: B,C

NEW QUESTION # 44
Which IS-IS PDU should be used by a router to list all LSPs that it believes should exist in the link-state database?

A. CSNP
B. IIH
C. PSNP
D. LSP

Answer: A

Explanation:
The Complete Sequence Number PDU (CSNP) is the IS-IS mechanism used to summarize the entire contents of a router's link-state database, listing the LSP ID, sequence number, checksum, and remaining lifetime for every LSP the sending router currently believes should exist in the database for that level. On broadcast (LAN) circuits, the elected Designated Intermediate System periodically transmits CSNPs to all routers on the segment as a database-synchronization mechanism; any receiving router compares the summarized list against its own local database, and any discrepancy - an LSP it is missing entirely, or one for which it holds an older sequence number - triggers a targeted request for the specific, updated LSP content. On point-to-point circuits, a single CSNP is exchanged once when the adjacency first comes up, serving the identical synchronization purpose without needing periodic repetition. The Partial Sequence Number PDU (PSNP), by contrast, is used to acknowledge receipt of specific LSPs or to explicitly request specific LSPs identified as missing or outdated after a CSNP comparison, making it a partial, targeted PDU rather than a complete database listing. The LSP itself is the PDU that actually carries the detailed topology and reachability information being advertised, rather than a database summary. The IS-IS Hello PDU (IIH) is used purely for neighbor discovery and adjacency maintenance and carries no link-state database summary information whatsoever. Reference topics: Junos Enterprise Routing - IS-IS, CSNP and Link-State Database Synchronization.

NEW QUESTION # 45
How does BGP prevent routing loops between internal peers?

A. It uses BFD.
B. It uses VRRP.
C. It uses AS path.
D. It uses a logical full mesh.

Answer: D

Explanation:
BGP employs two distinct loop-prevention mechanisms depending on whether peers are external or internal to the same autonomous system. Between external peers (EBGP), loop prevention relies on the AS path attribute: every time a route crosses an AS boundary, the local AS number is prepended to the path, and a router rejects any incoming route whose AS path already contains its own AS number, since that would indicate the route has looped back around.
Between internal peers (IBGP) within the same AS, however, the AS path attribute never changes, because IBGP does not add AS numbers as routes are readvertised internally -- meaning AS path alone cannot detect an internal loop. Instead, IBGP enforces a strict split- horizon-style rule: a router that learns a route via IBGP must never readvertise that route to another IBGP peer. This rule guarantees that every IBGP speaker within the AS must be directly peered with every other IBGP speaker (a logical full mesh) in order for all routers to receive all routes, since no IBGP router will relay IBGP-learned routes onward on another router's behalf.
This full-mesh requirement is precisely why techniques such as route reflection and confederations were later developed -- they preserve the same loop-prevention guarantee while relaxing the physical full-mesh peering burden. VRRP and BFD serve entirely unrelated purposes (gateway redundancy and fast failure detection, respectively) and play no role in BGP loop prevention.

NEW QUESTION # 46
Referring to the output shown in the exhibit, which two statements are true?

A. The route is an aggregate route
B. The route is not active
C. The route is a generate route
D. The route is active

Answer: C,D

NEW QUESTION # 47
......

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