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| Section | Objectives |
|---|---|
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Routing Protocols | - OSPF configuration and troubleshooting - IS-IS overview - BGP fundamentals and policy control |
| Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Layer 2 Switching Technologies | - VLANs and trunking - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
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NEW QUESTION # 66
Which two fields must match in an OSPF hello packet to form an adjacency over a broadcast link? (Choose two.)
Answer: A,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 # 67
Which two statements are true about high availability on Junos devices? (Choose two.)
Answer: A,C
NEW QUESTION # 68
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: C
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.
NEW QUESTION # 69
In RSTP, which three port roles are associated with the discarding state? (Choose three.)
Answer: A,B,C
Explanation:
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree. The roles include root, designated, alternate, backup, and disabled.
The discarding state is associated with the backup, alternate, and disabled roles. In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state. Disabled ports are also in the discarding state.
NEW QUESTION # 70
You have configured a GRE tunnel from your local router with tunnel source 10.0.0.1 to a remote router at destination 192.168.0.1. The tunnel is functioning until you commit set routing-options static route 0.0.0.0/0 next-hop gr-0/0/0. This configuration causes the tunnel to go down. Which statement is correct in this scenario?
Answer: A
Explanation:
A GRE tunnel's outer, delivery-layer packets are forwarded using the router's ordinary underlay routing table, meaning the tunnel destination address (192.168.0.1 in this case) must itself be resolvable to a physical, non-tunnel next hop for the encapsulated packets to actually leave the router. Before this configuration change, the default route (or some more specific route) presumably pointed toward a real physical next hop, allowing the router to reach 192.168.0.1 and keep the tunnel operational. When the administrator commits a static default route of 0.0.0.0/0 with a next hop of gr-0/0/0, every destination lookup that previously fell back to the default route -- including the lookup for the tunnel's own destination address, 192.168.0.1, since no more specific route exists for it -- now recurses through the GRE interface itself. This creates a circular dependency: the router needs to route to 192.168.0.1 to keep the tunnel up, but the only route it has to reach 192.168.0.1 now points back into the tunnel that requires 192.168.0.1 to already be reachable, so the interface's next-hop resolution fails and the tunnel drops. This is an entirely valid and common GRE design pitfall rather than any platform restriction; GRE interfaces can be legitimately used as static route next hops, do not require loopback-sourced encapsulation, and do not require a /32 host route to resolve their destination, provided that route does not recursively point back through the tunnel.
NEW QUESTION # 71
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