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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IS-IS | 10-15% | - Configuration and route exchange - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting |
| Topic 2: BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| Topic 3: Layer 2 Switching and VLANs | 15-20% | - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis |
| Topic 4: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing |
| Topic 5: OSPF | 15-20% | - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types - Route summarization and redistribution |
| Topic 6: Protocol Independent Routing | 10-15% | - Routing tables, static routes and route preference - Basic routing policy and filter operation - Routing instances and route selection criteria |
| Topic 7: Layer 2 Security | 10-15% | - Port security, MAC limiting and storm control - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features |
| Topic 8: IP Multicast | 5-10% | - IGMP operation and configuration - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms |
| Topic 9: Tunnels and Overlays | 5-10% | - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity - Tunnel types, encapsulation and operation |
>> Certification JN0-352 Test Questions <<
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NEW QUESTION # 179
A GRE tunnel is experiencing fragmentation issues. You confirm that the tunnel is up and is functioning correctly. You confirm that hosts are sending 1500-byte packets.
In this scenario, which statement is correct?
Answer: A
Explanation:
GRE encapsulation adds a fixed 24 bytes of overhead to every packet it carries - 4 bytes for the GRE header itself and 20 bytes for the new outer IPv4 delivery header. When a host transmits a full 1500-byte Ethernet payload into a gr- interface, the resulting encapsulated packet becomes 1524 bytes, which exceeds the physical interface's standard 1500-byte MTU and forces fragmentation or drops if the don't-fragment bit is set.
The correct remediation is to reduce the effective MTU seen by end hosts so that encapsulated packets never exceed the physical link's transmission limit. Junos automatically applies this logic to gr- logical interfaces, which default to a 1476-byte protocol MTU (1500 minus 24), but when the underlying physical interface or a manually configured path is involved, administrators must explicitly size the interface MTU to 1476 bytes to prevent post-encapsulation oversize packets. Allowing fragmentation with clear-dont-fragment is a workaround that increases CPU load and can degrade performance rather than solving the root cause, BFD addresses link-failure detection rather than MTU sizing, and ToS copying affects only the type-of-service byte, not packet length. Reference topics: Junos Enterprise Routing - Tunneling, GRE Encapsulation and MTU Considerations; Junos OS Configuring GRE Tunnel Interfaces.
NEW QUESTION # 180
Referring to the exhibit, why is the route for 10.5.5.5 hidden?
Answer: D
NEW QUESTION # 181
You are concerned about spoofed MAC addresses on your LAN. Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)
Answer: A,B
Explanation:
A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping. DAI discards any ARP packets that do not match the database or have invalid formats. C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports. DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client.
NEW QUESTION # 182 
Click the Exhibit button.
A network includes several autonomous systems that exchange routing information using BGP. Multiple BGP routes exist for the same prefix.
Referring to the exhibit, which attribute would BGP use first when selecting a preferred route?
Answer: C
Explanation:
The Junos BGP path selection algorithm proceeds through a strict, ordered sequence of comparison steps, and once next-hop reachability and route preference (administrative distance) have been confirmed as equal, local preference is the very first BGP-specific path attribute evaluated in the decision process. A route carrying a higher local preference value is always chosen over a competing route to the same prefix with a lower local preference, and this comparison takes absolute precedence over every subsequent attribute in the algorithm; if local preference values differ between candidate paths, the selection process concludes at this step without ever needing to examine AS path length, origin type, or MED at all. Only when two or more competing paths share an identical local preference value does the algorithm proceed to its third step, comparing AS path length and preferring the shortest, and only after a further tie does it move on to origin type (preferring IGP- origin over EGP-origin, and EGP-origin over incomplete), followed by MED comparison (preferring the lowest value, and only among routes learned from the same neighboring AS by default). Because local preference is evaluated strictly before all three of the other listed attributes, it is the attribute BGP consults first among the choices given, making it the deciding factor in scenarios such as this exhibit where multiple autonomous systems advertise competing paths toward the same 192.168.1.0/24 prefix. Reference topics:
Junos Enterprise Routing - BGP, Understanding BGP Path Selection Order.
NEW QUESTION # 183
A Juniper Networks EX Series Switch has storm control enabled on all interfaces. The ge-0/0/1 interface carrying several VLANs hits its storm control limit and is shut down.
In this scenario, which command allows you to manually clear the violation?
Answer: A
Explanation:
When storm control on an EX Series switch is configured with an action of interface-shutdown (rather than the default of simply dropping excess traffic), exceeding the configured bandwidth threshold for broadcast, multicast, or unknown-unicast traffic causes Junos to administratively disable the offending interface to protect the rest of the switching fabric. Recovery from this condition can happen automatically if a recovery- timeout interval has been configured, but when immediate manual recovery is required, the operational command clear ethernet-switching recovery-timeout interface interface-name explicitly clears the storm- control-triggered violation and re-enables the port without waiting for the timer to expire. This command is purpose-built for this exact condition and is distinct from more general troubleshooting commands: clear ethernet-switching table purges the learned MAC address database and has no bearing on a storm-control- disabled port; clear interface statistics resets traffic counters for diagnostic baselining but does not touch administrative state; and clear log messages simply flushes the local system log buffer. Administrators should also verify the underlying cause of the storm - a switching loop, a misbehaving host, or a misconfigured device - before manually clearing the condition, since without addressing the root cause the port is likely to trip again. This command and workflow are commonly tested as part of the Layer 2 security and resiliency features on EX platforms. Reference topics: Junos Enterprise Switching - Storm Control and Port Security, Recovering Interfaces Disabled by Storm Control.
NEW QUESTION # 184
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