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| Section | Weight | Objectives |
|---|---|---|
| Tunnels and Overlays | 5-10% | - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity - Tunnel types, encapsulation and operation |
| Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control - DHCP snooping, Dynamic ARP Inspection and IP Source Guard |
| BGP | 15-20% | - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment - Route advertisement, attributes and path selection |
| Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Routing tables, static routes and route preference - Basic routing policy and filter operation |
| OSPF | 15-20% | - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types - Route summarization and redistribution |
| IP Multicast | 5-10% | - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms - IGMP operation and configuration |
| High Availability and Resiliency | 5-10% | - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting - Graceful restart and non-stop routing |
| IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting - Configuration and route exchange |
| Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging - Link Aggregation Groups (LAG) and Virtual Chassis |
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156. Frage
Which two characteristics describe the default behavior of aggregate routes? (Choose two.)
Antwort: A,B
Begründung:
The entire purpose of route aggregation is summarization -- replacing a set of more-specific contributing routes with a single, broader prefix advertised outward -- and this summarization inherently hides internal routing instability from external peers: if one of the underlying contributing /24 blocks within a summarized /16 flaps up and down due to a local link issue, external peers who only see the stable, unchanging /16 aggregate are completely insulated from that churn, since the aggregate itself remains active and advertised as long as at least one contributing route is present, regardless of how much internal fluctuation occurs among the individual contributors. This stability- hiding characteristic is one of the primary operational benefits that motivates using aggregate routes in the first place, confirming that statement as correct. Regarding next-hop behavior, official Juniper documentation is explicit and unambiguous:
when an aggregate route is installed in the routing table, Junos assigns it a reject next hop by default, meaning traffic matching only the aggregate (and no more-specific contributor) is dropped and an ICMP unreachable message is returned to the source; a discard next hop is available only as an optional, explicitly configured alternative when silent dropping without ICMP notification is preferred, but it is not the default. Aggregate routes categorically do not advertise their individual contributing routes; suppressing those specific, more- granular prefixes from onward advertisement in favor of the single summary is the aggregate's defining function, directly contradicting the first statement.
157. Frage
You are configuring a router as a new Level 1 router in an existing Level 1 area. The NET address for an existing Level 1 router is 49.0011.1111.2222.3333.00. The new router must form a Level 1 adjacency with the existing router. What should be the area ID in this scenario?
Antwort: C
158. Frage
Referring to the output shown in the exhibit, which statement is correct?
Antwort: D
159. Frage
Which two fields must match in an OSPF hello packet to form an adjacency over a broadcast link? (Choose two.)
Antwort: B,D
Begründung:
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.
160. Frage
Which two statements are correct about generated routes? (Choose two.)
Antwort: C,D
Begründung:
A is correct because generated routes require a contributing route. A contributing route is a route that matches the destination prefix of the generated route and has a valid next hop. A generated route is only installed in the routing table if there is at least one contributing route available. This ensures that the generated route is reachable and useful. If there is no contributing route, the generated route is not added to the routing table.
B is correct because generated routes show a next hop in the routing table. A generated route inherits the next hop of its primary contributing route, which is the most preferred route among all the contributing routes. The next hop of the generated route can be either an IP address or an interface name, depending on the type of the contributing route. The next hop of the generated route can also be modified by a routing policy.
161. Frage
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