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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
| Topic 2: IP Multicast | 5-10% | - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting |
| Topic 3: High Availability and Resiliency | 5-10% | - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting - Graceful restart and non-stop routing |
| Topic 4: Layer 2 Security | 10-15% | - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard |
| Topic 5: Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration |
| Topic 6: BGP | 15-20% | - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection - Neighbor relationships and session establishment |
| Topic 7: IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics - Configuration and route exchange |
| Topic 8: 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 9: OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
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NEW QUESTION # 129
You have configured an aggregate route for prefix 10.20.0.0/22 with three contributing routes: 10.20.0.0/24,
10.20.1.0/24, and 10.20.2.0/24. A packet arrives destined to 10.20.3.100.
In this scenario, which action does the router take?
Answer: A
Explanation:
The 10.20.0.0/22 aggregate covers the four /24 blocks 10.20.0.0/24 through 10.20.3.0/24, but only the first three of those (10.20.0.0/24, 10.20.1.0/24, and 10.20.2.0/24) are configured and present as active contributing routes; 10.20.3.0/24, the block containing the destination address 10.20.3.100, has no corresponding contributing route in this configuration. Because no more-specific route exists for 10.20.3.100, the longest- match lookup falls through the missing /24 and matches only the broader /22 aggregate itself. By default, when Junos installs an aggregate route, it assigns that route a reject next hop rather than any usable forwarding next hop; this is a deliberate design choice so that traffic destined for gaps within an advertised summary block - gaps where no real, more-specific path actually exists - is not blindly forwarded toward whatever next hop happens to belong to one of the unrelated contributing routes. A reject next hop causes the router to drop the packet and generate and return an ICMP destination-unreachable message to the originating source, explicitly informing it that no path exists, which is functionally and behaviorally distinct from a silent discard next hop that would drop the packet without any such notification. Aggregate routes never adopt or forward through any single contributing route's next hop, which rules out the two forwarding-based answer choices entirely. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Default Reject Next Hop for Aggregate Routes.
NEW QUESTION # 130
Which two actions are performed by the firewall filter shown in the exhibit? (Choose two.)
Answer: A,C
NEW QUESTION # 131
Which statement is correct about graceful Routing Engine switchover (GRES)?
Answer: C
Explanation:
The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails.
GRES preserves interface and kernel information, ensuring that traffic is not interrupted.
However, GRES does not preserve the control plane.
To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR). When GRES is combined with NSR, nearly
75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES. Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur.
Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd.
NEW QUESTION # 132
Which two statements describe OSPF DR and BDR behavior? (Choose two.)
Answer: A,C
Explanation:
The Backup Designated Router exists specifically to provide immediate failover redundancy for the Designated Router role on a multi-access broadcast or NBMA segment: the BDR maintains full adjacencies with every other router on the segment concurrently with the DR, precisely so that if the DR ever fails or is withdrawn, the BDR can be promoted directly to DR essentially instantaneously, without needing to wait through a fresh, full DR/BDR election process, and a new BDR election then takes place separately among the remaining DROther routers to fill the now-vacant backup role. This immediate promotion behavior confirms the first statement as correct. The Designated Router's other core responsibility on the segment is originating the Type
2 Network LSA, which describes the multi-access network itself as a pseudonode, listing every router attached to that segment; this LSA type exists specifically to avoid the full-mesh explosion of Router LSA adjacency listings that would otherwise be needed to describe a shared broadcast segment, and only the DR -- never the BDR, and never any DROther -- is responsible for generating and maintaining this particular LSA under normal, stable conditions, which confirms the third statement while directly ruling out the fourth. There is no such thing as the DR 'electing' an area border router; ABR status is instead a role a router acquires organically by having interfaces in more than one OSPF area, entirely independent of any DR/BDR election process on any individual segment.
NEW QUESTION # 133
Which two fields must match in an OSPF hello packet to form an adjacency over a broadcast link? (Choose two.)
Answer: B,C
Explanation:
RFC 2328 specifies a precise set of parameters that two OSPF routers on a broadcast network must agree upon before a valid neighbor relationship can be established, and a mismatch in any of these mandatory fields causes the routers to reject each other's Hello packets outright rather than forming even a basic 2-Way state.
The network mask carried in each Hello packet must match between neighbors on a broadcast segment, since OSPF uses this field to confirm both routers agree on the subnet boundaries of the shared segment; a mismatched mask (for example, one router configured with a /24 and its neighbor with a /25 on the same physical wire) is treated as a configuration error and blocks adjacency formation. The router dead interval, which defines how long a router will wait without receiving a Hello before declaring a neighbor down, must likewise match exactly between neighbors, alongside the closely related hello interval, since these timers govern the shared expectations both sides have for how frequently Hellos should arrive and how quickly a failure should be detected; Junos explicitly checks and rejects Hello packets carrying a mismatched dead interval value. Router priority, by contrast, is intentionally allowed to differ between neighbors on the same segment - it exists precisely so that administrators can differentiate router preference for the DR/BDR election, and differing values are expected and normal rather than being blocked. The designated router field, as advertised within each Hello, is informational about the sender's current view of the segment's DR and is not a value that must be identical between the two Hello senders to permit adjacency formation. Reference topics: Junos Enterprise Routing - OSPF, Required Hello Parameter Matching on Broadcast Networks.
NEW QUESTION # 134
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