JN0-352 Fragen&Antworten & JN0-352 Fragen Und Antworten

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Juniper JN0-352 Exam Syllabus Topics:

Section	Objectives
Topic 1: Routing Policy and Filtering	- Route filtering and preference control - Policy statements
Topic 2: Layer 2 Switching Technologies	- Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking - Ethernet switching concepts
Topic 3: High Availability	- VRRP configuration and behavior - Redundancy concepts in enterprise networks
Topic 4: Network Services	- NAT concepts in Junos - Basic multicast concepts
Topic 5: Operations and Troubleshooting	- Junos CLI monitoring tools - Troubleshooting routing and switching issues
Topic 6: Routing Protocols	- IS-IS overview - OSPF configuration and troubleshooting - BGP fundamentals and policy control

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-352 Prüfungsfragen mit Lösungen (Q154-Q159):

154. Frage
Which statement describes the purpose of an integrated routing and bridging (IRB) interface on a Juniper Networks EX Series Switch?

A. It performs Layer 2 switching across multiple VLANs.
B. It replaces the need for trunk ports.
C. It removes the need for routing instances.
D. It provides a Layer 3 gateway for a specific VLAN.

Antwort: D

Begründung:
An integrated routing and bridging interface, configured as irb.x on an EX Series switch, is the mechanism that bridges the Layer 2 and Layer 3 forwarding planes for a given bridge domain or VLAN. By assigning an irb logical unit to a VLAN and configuring an IP address on that unit, the switch gains a routable Layer 3 gateway address that hosts within that VLAN can use as their default gateway, enabling traffic destined for other subnets to be routed off the local broadcast domain. Internally, when a frame destined for the gateway's MAC address arrives on any port belonging to that VLAN, the switch's integrated circuitry hands the packet from the Layer 2 bridging domain to the Layer 3 routing engine associated with the corresponding irb interface, and vice versa for the return path - hence the name 'integrated routing and bridging.' IRB does not eliminate the need for routing instances, which remain a separate mechanism for isolating routing tables; it does not itself perform inter-VLAN switching, since switching still happens strictly within a VLAN's own broadcast domain; and it has no relationship to trunk ports, which remain necessary for carrying multiple tagged VLANs between switches. IRB is the standard method for enabling inter-VLAN routing on a single EX Series switch without an external router. Reference topics: Junos Enterprise Switching - Routing VLANs, Configuring Integrated Routing and Bridging.

155. Frage
What are three valid OSPF adjacency states? (Choose three.)

A. down
B. reject
C. loading
D. established
E. init

Antwort: A,C,E

Begründung:
OSPF neighbor state progression, as defined in RFC 2328 and displayed by Junos through show ospf neighbor, moves through a well-defined set of named states: Down, Attempt, Init, 2-Way, ExStart, Exchange, Loading, and Full. Down is the initial state, indicating no Hello packets have been recently received from a potential neighbor on that interface; it is a genuine, valid OSPF state and is correctly included here. Init indicates that a Hello packet has been received from the neighbor, but that neighbor has not yet listed the local router's own router ID within its Hello packet, so bidirectional communication has not yet been confirmed; this too is a standard, valid state. Loading occurs after the Exchange state, during which Database Description packets have been fully exchanged and the router is now actively requesting the specific, more-detailed LSAs it identified as missing or outdated from its neighbor via Link State Request packets; it is likewise a standard, valid OSPF neighbor state. 'Established' is not an OSPF state at all - that terminology belongs to BGP's finite state machine, where Established represents the fully operational session state; the OSPF equivalent concept is instead called Full. 'Reject' is not a recognized OSPF neighbor state under any circumstance and does not appear anywhere in the RFC 2328 state machine, making it an invalid distractor as well. Reference topics: Junos Enterprise Routing - OSPF, The OSPF Neighbor State Machine.

156. Frage
Based on the output shown in the exhibit, which statement is correct?

A. This switch is currently blocking all traffic.
B. The ge-0/0/9 interface is using the default interface priority value.
C. This switch has a bridge priority of 8k.
D. The ge-0/0/15 interface is using the default port cost.

Antwort: C

157. Frage
Referring to the exhibit, which configuration change is needed for an IS-IS Level 1 adjacency between R1 and R2?

A. Enable Level 2 on R1's ge-0/0/1 interface
B. Configure the lo0 family ISO address 49.0002.0010.0042.0002.00 on R1
C. Disable Level 2 on R2's ge-0/0/1 interface
D. Configure the lo0 family ISO address 49.0002.0010.0042.0002.00 on R2

Antwort: D

158. Frage
You are asked to explore adding BGP route reflectors to allow for increased scale in your core network. Which statement is correct in this scenario?

A. Route reflectors are required whenever internal BGP (IBGP) sessions are needed.
B. The cluster ID is required to prevent routing loops.
C. The cluster ID is not required to use route reflectors.
D. Route reflectors require that the network is connected in a physical full mesh.

Antwort: B

159. Frage
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