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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: 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 2: Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging |
| Topic 3: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
| Topic 4: Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing instances and route selection criteria - Routing tables, static routes and route preference |
| Topic 5: High Availability and Resiliency | 5-10% | - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting - Graceful restart and non-stop routing |
| Topic 6: IP Multicast | 5-10% | - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting |
| Topic 7: OSPF | 15-20% | - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting - Route summarization and redistribution |
| Topic 8: BGP | 15-20% | - Route advertisement, attributes and path selection - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting |
| Topic 9: IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Configuration and route exchange - Adjacency establishment, levels and metrics |
>> Juniper JN0-352 Updated Dumps <<
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NEW QUESTION # 42
On Juniper devices, which statement correctly describes a basic characteristic of a GRE tunnel?
Answer: D
Explanation:
GRE is fundamentally a stateless encapsulation protocol: the encapsulating router simply wraps the passenger packet in a GRE header and an outer delivery IP header and forwards it based on ordinary IP routing table lookups toward the configured tunnel destination address. For that forwarding to succeed, the underlying (global or routing-instance) routing table on each endpoint must contain a valid, reachable route to the far-end tunnel address; without such a route, the tunnel interface will not come up or will be unable to deliver traffic, since GRE relies entirely on the existing IP infrastructure rather than any tunnel-specific signaling to establish reachability.
Because GRE has no built-in state machine or session negotiation, it does not natively track whether the remote endpoint is alive -- that requires an optional add-on such as GRE keepalives or BFD, neither of which is enabled by default; an operator must explicitly configure them if failure detection is required. GRE is also protocol-agnostic rather than IPv4-only: it can encapsulate IPv4, IPv6, MPLS, and other network- layer protocols as the passenger, which is one of its defining advantages over IP-in-IP tunneling. Finally, because GRE keeps no per-session state about the peer, it cannot detect or report tunnel failures on its own, reinforcing why route reachability is the one true prerequisite for tunnel operation.
NEW QUESTION # 43
Your company has a branch location that uses a Juniper Networks EX Series Switch. You are asked to troubleshoot a spanning-tree issue that keeps reoccurring within the branch environment. After investigation, you discover that end-devices running a virtualization application are generating BPDUs, which are disrupting the spanning-tree topology and causing periodic outages.
Which solution will prevent this problem from reoccurring?
Answer: D
Explanation:
This scenario describes end hosts - virtualization hosts running software switches or virtual bridging stacks
- unexpectedly generating and transmitting BPDUs on ports that are supposed to be pure edge (host-facing) ports where no BPDUs should ever legitimately be received. BPDU protection (BPDU guard) is the Junos feature purpose-built for exactly this situation: when applied to an edge-designated interface, it continuously monitors that port for any incoming BPDU, and the moment one is detected, it immediately and automatically disables the port, preventing the unexpected BPDU source from ever participating in or influencing the spanning-tree topology calculation, thereby protecting the stable, intended topology from disruption caused by unauthorized or accidental BPDU generation at the access edge. This directly and precisely resolves the described problem at its source, since the root cause is illegitimate BPDUs arriving on ports that were never meant to see them. Increasing the max-age timer only adjusts how long stale topology information is retained before being aged out and has no effect on preventing rogue BPDUs from being processed in the first place.
Disabling RSTP outright on access interfaces would eliminate spanning tree's loop-prevention protection on those ports entirely, introducing a much more severe risk of undetected Layer 2 loops. Root protection (root guard) defends specifically against a port attempting to become the root port by receiving a superior BPDU claiming a better path to root; it addresses a different threat model than blocking any BPDU outright on a true edge port. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, BPDU Protection on Edge Interfaces.
NEW QUESTION # 44
Which mechanism is used to share routes between routing tables?
Answer: D
NEW QUESTION # 45
Click the Exhibit button. A network has three Juniper Networks EX Series Switches connected together. No changes have been made to the default spanning-tree configuration. Referring to the exhibit, which statement is correct about the root bridge?
Answer: A
Explanation:
Root bridge election is based on comparing each switch's full Bridge Identifier, which combines the bridge priority value with the switch's MAC address, with priority always evaluated first and MAC address serving strictly as a tiebreaker when two or more switches present identical priority values. In this scenario, the network has been left entirely at the default spanning-tree configuration, meaning every switch is operating at the standard IEEE and Junos default bridge priority of 32768; since all three switches share the exact same priority value, the comparison necessarily falls through to the MAC address tiebreak, where the switch with the numerically lowest MAC address wins the election. Comparing the three addresses shown --
00:1a:2b:3c:4d:01, 00:1a:2b:3c:4d:02, and
00:1a:2b:3c:4d:03 -- Switch A's address is the lowest, since only the final octet differs and 01 is less than both 02 and 03, making Switch A the elected root bridge. RSTP uses the identical Bridge ID comparison mechanism as legacy STP for root election, so there is no special 'median MAC address' rule that applies uniquely under RSTP, making that distractor factually invalid regardless of protocol version. The election process also does not require any manual bridge priority configuration to complete; the default priority value is entirely sufficient on its own to allow a deterministic election to occur, since default priorities are still numerically comparable Bridge IDs.
NEW QUESTION # 46
You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?
Answer: D
Explanation:
For GRE tunnel keepalive to function properly, the hold time should be set to at least twice the keepalive interval to ensure proper detection and recovery of the tunnel state. In the exhibit, both keepalive-time and hold-time are set to 10 seconds, which is not optimal. The hold-time should be at least double the keepalive-time value.
So, to fix the issue, you should configure the hold-time to be 20 seconds or more.
NEW QUESTION # 47
......
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