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Juniper JN0-352 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q163-Q168):

NEW QUESTION # 163
Based on the traceoptions output shown in the exhibit, what is the problem with the adjacency?

A. connectivity
B. MTU mismatch
C. authentication mismatch
D. area mismatch

Answer: D

NEW QUESTION # 164
Which statement is correct about the configuration shown in the exhibit?

A. The ge-0/0/0 and ge-0/0/1 interfaces are operating in trunk mode.
B. The configuration will not complete the commit check process and will error out.
C. All three interfaces are operating in access mode.
D. The ge-0/0/2 interface is operating as a Layer 3 interface.

Answer: C

NEW QUESTION # 165
Referring to the exhibit, Router-1 and Router-2 are failing to form an IS-IS adjacency.

What should you do to solve the problem?

A. Change the IP subnet masks to match on the ge-0/0/2 interfaces of both routers.
B. Change the ISO areas on the lo0 interfaces to match on both routers.
C. Remove the ISO address from ge-0/0/2 on Router-1.
D. Remove the overloaded statement from Router-1.

Answer: C

NEW QUESTION # 166
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. Configure the switch interface as an access port.
B. Verify the CAK and CKN match on both sides of the link.
C. Configure the switch interface as a trunk port.
D. Verify the MTU on both sides of the link.

Answer: B,D

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 # 167
You have traffic for a video streaming application traversing a GRE tunnel in your network and users are reporting poor performance. Both ends of the tunnel are using the default settings for a gigabit Ethernet interface, but you observe excessive packet drops due to exceeding the MTU.
Which two steps would you take to improve connectivity for this application? (Choose two.)

A. Route the GRE tunnel through a higher bandwidth link.
B. Increase the MTU for the member interfaces to 1500 bytes.
C. Increase the MTU for the member interfaces to 1524 bytes.
D. Configure the clear-dont-fragment option on the member interfaces.

Answer: C,D

Explanation:
The described symptom - excessive packet drops specifically attributed to exceeding the MTU on a GRE tunnel carrying full-size video streaming traffic across default-MTU gigabit Ethernet interfaces - is a direct consequence of the 24 bytes of GRE encapsulation overhead pushing packets that were already at or near the standard 1500-byte Ethernet MTU past the physical interface's transmission limit once the outer GRE and IP headers are added. The most durable fix is to proactively increase the physical member interfaces' MTU beyond the 1500-byte default - to 1524 bytes or higher - which provides sufficient headroom to absorb the full GRE encapsulation overhead without ever causing the fully encapsulated packet to exceed the interface's transmission capability, allowing full-size 1500-byte payloads to pass through the tunnel intact and without fragmentation or drops. As a complementary measure, configuring the clear-dont-fragment-bit option on the tunnel or member interfaces instructs Junos to clear the DF (don't fragment) bit on oversized packets rather than dropping them outright when they do exceed the available MTU, allowing the Packet Forwarding Engine to fragment and later reassemble the traffic instead of silently discarding it, which directly addresses the reported packet loss even under transient conditions. Simply raising the MTU only to 1500 bytes fails to account for the 24-byte GRE overhead and would not resolve the underlying oversize condition. Routing the tunnel over a higher-bandwidth link addresses potential congestion but does nothing to correct an MTU-based packet-size violation, which is the root cause explicitly identified in this scenario. Reference topics: Junos Enterprise Routing - Tunneling, GRE MTU Sizing and Fragmentation Handling for High-Throughput Applications.

NEW QUESTION # 168
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