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| Section | Objectives |
|---|---|
| Topic 1: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 2: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Topic 3: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 4: Routing Protocols | - IS-IS overview - OSPF configuration and troubleshooting - BGP fundamentals and policy control |
| Topic 5: Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
| Topic 6: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
In the Desktop JN0-352 practice exam software version of Juniper JN0-352 practice test is updated and real. The software is useable on Windows-based computers and laptops. There is a demo of the Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-352) practice exam which is totally free. Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-352) practice test is very customizable and you can adjust its time and number of questions.
NEW QUESTION # 193
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.)
Answer: B,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.
NEW QUESTION # 194
Which two elements are used to create the STP bridge ID? (Choose two.)
Answer: A,D
NEW QUESTION # 195
A host connected to interface ge-0/0/3 on your Juniper Networks EX Series Switch cannot reach another device in the same VLAN. The administrator wants to confirm that the switch has learned the MAC address of the host.
Which command should be used to accomplish this task?
Answer: D
Explanation:
The show ethernet-switching table command displays the Layer 2 forwarding database (the bridge or MAC table) that an EX Series switch builds dynamically by inspecting the source MAC address of every frame it receives. Each entry records the learned MAC address, the VLAN it was learned on, the type of entry (dynamic, static, or persistent), and the specific interface through which that address was seen, which is precisely the information needed to confirm whether the switch has learned the host connected to ge-0/0/3. If the host's MAC address is absent from the table, that immediately points to a Layer 1/2 issue - no frames have been received from the host, a cabling or port problem exists, or the interface is administratively down or blocked by spanning tree - rather than a Layer 3 routing or VLAN membership problem. show interfaces terse only reports administrative and link state along with any assigned protocol family addresses, offering no MAC-learning visibility. show vlans lists VLAN definitions and their member interfaces but does not display learned host addresses. show interfaces extensive provides detailed physical-layer counters and error statistics, useful for diagnosing frame loss or interface errors, but it does not expose the switching table. For intra- VLAN reachability troubleshooting, verifying MAC learning is always the first and most direct Layer 2 checkpoint. Reference topics: Junos Enterprise Switching - Layer 2 Switching Fundamentals, Monitoring the Ethernet Switching Table.
NEW QUESTION # 196
How many bytes of overhead does an IP-IP tunnel add to a packet?
Answer: A
NEW QUESTION # 197
You are deploying an EX Series switch with a Wi-Fi access point. The access point needs all untagged traffic to use a specific VLAN. In this scenario, which feature should you enable on the switch port?
Answer: B
NEW QUESTION # 198
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