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Juniper JN0-352 Exam Syllabus Topics:

Section	Weight	Objectives
Layer 2 Switching and VLANs	15-20%	- Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging
Protocol Independent Routing	10-15%	- Routing instances and route selection criteria - Basic routing policy and filter operation - Routing tables, static routes and route preference
BGP	15-20%	- Route advertisement, attributes and path selection - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting
High Availability and Resiliency	5-10%	- Network resiliency design and troubleshooting - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms
Tunnels and Overlays	5-10%	- Overlay network design and connectivity - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration
OSPF	15-20%	- Route summarization and redistribution - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting
IP Multicast	5-10%	- IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting
Layer 2 Security	10-15%	- Port security, MAC limiting and storm control - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard
IS-IS	10-15%	- Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting - Configuration and route exchange

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q168-Q173):

NEW QUESTION # 168
Referring to the exhibit, which statement is correct?

A. The root bridge is using a bridge priority of 4k.
B. The local device is the root bridge for this RSTP topology.
C. The root bridge has not been elected for this RSTP topology.
D. The local device is using a bridge priority of 4k.

Answer: A

Explanation:
The "Root ID" shows 4096.00:19:e2:55:36:1e. The first part of this ID, 4096, is the bridge priority of the root bridge.
The local bridge ID is shown as 32768.00:19:e2:55:1d:30, indicating that the local device has a default bridge priority of 32768, which is higher (and thus less preferred) than 4096.
Thus, the root bridge has a priority of 4096, and the local device is not the root bridge. The local device is participating in the RSTP topology and has identified another bridge as the root.

NEW QUESTION # 169
You have enabled MACsec on two directly connected Ethernet devices but MACsec is not working.
Which two actions will solve this problem? (Choose two.)

A. Verify the MTU on both sides of the link.
B. Verify the CAK and CKN match on both sides of the link.
C. Configure the switch interface as an access port.
D. Configure the switch interface as a trunk port.

Answer: A,B

Explanation:
MACsec (IEEE 802.1AE) secures a point-to-point Ethernet link independently of how the logical unit above it is configured for VLAN tagging, so neither trunk mode nor access mode has any bearing on whether the MACsec Key Agreement (MKA) protocol can establish a secure channel. What does determine success is the pre-shared key material: when static CAK security mode is used, the Connectivity Association Key (CAK) and the Connectivity Association Key Name (CKN) must be configured identically on both ends of the link.
If they do not match, MKA never completes the exchange, no secure channel is created, and all traffic on that interface is dropped rather than merely left unencrypted. Equally important, and frequently overlooked, is that MACsec adds up to 32 bytes of overhead per frame for the security tag (SecTAG) and integrity check value (ICV); Juniper's official guidance is to ensure the difference between the interface's physical MTU and the protocol MTU is large enough to absorb this overhead, or frames will be silently discarded once encryption is active, producing symptoms that look identical to a failed session. Both the CAK/CKN and MTU checks are documented first-line troubleshooting steps for MACsec on EX Series switches. Reference topics: Junos Enterprise Switching - Layer 2 Security, Configuring and Troubleshooting MACsec on EX Series Switches.

NEW QUESTION # 170
What are three well-known mandatory BGP attributes? (Choose three.)

A. community
B. AS path
C. local preference
D. next hop
E. origin

Answer: B,D,E

NEW QUESTION # 171
Which statement is true about Layer 2 firewall filters on EX Series switches?

A. They are stateless and evaluated by the control plane.
B. They are stateless and evaluated by the forwarding plane.
C. They are stateful and evaluated by the control plane.
D. They are stateful and evaluated by the forwarding plane.

Answer: B

NEW QUESTION # 172
You want to redistribute the static routes into BGP, but they do not show as BGP routes.
What causes this result to occur?

A. A community string must be configured.
B. The static routes do not have a valid next hop.
C. The no-readvertisefeature is specified.
D. The as-pathparameter must be specified.

Answer: B

NEW QUESTION # 173
......

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