JN0-352 Reliable Study Materials - Trustworthy JN0-352 Practice

JN0-352 Reliable Study Materials - Trustworthy JN0-352 Practice

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Juniper JN0-352 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q161-Q166):

NEW QUESTION # 161
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

  • A. static route using qualified next hops
  • B. static route using the resolve feature
  • C. aggregate route
  • D. generate route

Answer: D

Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
One key difference:
With aggregated routes any prefix in the routing table counts as a contributing route.
With generated routes only prefix with a valid next-hop qualifies.


NEW QUESTION # 162
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 MTU on both sides of the link.
  • C. Verify the CAK and CKN match on both sides of the link.
  • D. Configure the switch interface as a trunk port.

Answer: B,C

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 # 163
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure. By default, what impact will this failure have on traffic forwarding between the switches?

  • A. The LAG continues forwarding traffic across the remaining member links.
  • B. Only broadcast traffic continues to be forwarded across the LAG.
  • C. The LAG renegotiates and temporarily disables all member links.
  • D. All traffic will be dropped because the LAG goes administratively down.

Answer: A

Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating. When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link-status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors -- full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation -- reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption.


NEW QUESTION # 164
What determines the preferred route to a destination in an IS-IS network?

  • A. the path that has the lowest accumulated metric value
  • B. the path that passes through a Level 2 router closest to the destination
  • C. the path that has the most recently originated LSP
  • D. the path that has the highest accumulated metric value

Answer: A

Explanation:
IS-IS is a link-state protocol that, like OSPF, runs Dijkstra's Shortest Path First algorithm independently on each router against its own copy of the synchronized link-state database to compute the best path toward every reachable destination. Each link within the topology carries an administrator-assigned or default metric, and as the SPF algorithm walks the topology graph from the local router outward, it sums the metrics of every link traversed along a candidate path to produce that path's total accumulated cost. Among all possible paths to a given destination prefix, IS-IS always selects and installs the path (or, in the case of equal-cost multipath, the set of paths) with the numerically lowest total accumulated metric, exactly mirroring the 'lowest cost wins' principle shared by essentially all link-state IGPs. A higher accumulated metric value is by definition a less preferred, more costly path, making that option the direct inverse of correct IS-IS behavior. Level 2 proximity to the destination has no independent bearing on path selection beyond however it happens to be reflected in the accumulated metric itself - IS-IS does not apply a separate rule preferring paths merely for passing near a Level 2 router. Likewise, LSP recency (sequence number or freshness) governs which version of a given LSP is trusted and flooded during database synchronization, ensuring the topology database itself is accurate and loop-free, but it plays no role in the SPF cost comparison once the database is synchronized and consistent. Reference topics: Junos Enterprise Routing - IS-IS, SPF Calculation and Metric-Based Path Selection.


NEW QUESTION # 165
Which two statements about DHCP snooping are correct? (Choose two.)

  • A. By default, the Junos OS treats access ports as trusted and trunk ports as untrusted.
  • B. DHCP snooping uses ARP to add statically defined IP addresses to its database.
  • C. The DHCP database maps IP addresses, MAC addresses, and the associated VLAN.
  • D. DHCP snooping inspects all DHCP packets on untrusted ports.

Answer: C,D


NEW QUESTION # 166
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