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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing |
| Topic 2: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
| Topic 3: Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control |
| Topic 4: BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| Topic 5: OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
| Topic 6: 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 |
| Topic 7: IS-IS | 10-15% | - Configuration and route exchange - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting |
| 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: Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Basic routing policy and filter operation - Routing tables, static routes and route preference |
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NEW QUESTION # 63
You are asked to change the setting for the LSAs age out back to the default value. In this scenario, which time interval will accomplish this task?
Answer: A
NEW QUESTION # 64
You implement FBF on router R1 so that traffic from subnet 172.25.0.0/24 uses ISP-A and traffic from subnet 172.25.1.0/24 uses ISP-B. You create forwarding instances for ISP-A and ISP-B.
You also configure static default routes inside each instance. However, the static default routes remain inactive. In this scenario, which action would complete the FBF implementation?
Answer: A
Explanation:
A classic and well-documented gotcha in filter-based forwarding deployments is that the static default route configured inside each forwarding instance frequently references a next-hop address that Junos cannot resolve, simply because the interface and other directly connected routes needed to validate that next hop as reachable exist only in the master inet.0 table by default, not automatically inside the newly created forwarding instance's own table. Since a static route's next hop must be resolvable against routes present within its own routing table to become active, the static default routes inside the ISP-A and ISP-B forwarding instances remain inactive precisely because the necessary interface/next-hop routes were never made visible inside those instances. The standard solution taught for this exact FBF scenario is to configure a routing information base (RIB) group that explicitly imports the relevant interface routes between the master inet.0 table and each forwarding instance's table, allowing the static default route's next hop inside each instance to resolve correctly against the leaked routes and become active.
Applying a firewall filter without ever attaching it to an interface accomplishes nothing, since an unapplied filter never evaluates any traffic. Increasing the static route's preference value only affects which competing route wins selection and does nothing to resolve an unreachable next hop. Changing the instance type away from forwarding (to virtual-router) would in fact break FBF entirely, since filter-based forwarding specifically depends on the forwarding instance type working together with a routing-instance firewall filter action.
NEW QUESTION # 65
You want to configure a floating static route.
What must be configured in this scenario?
Answer: A
Explanation:
A floating static route is a backup static route that remains present in the configuration but stays inactive in the routing table under normal conditions, only becoming active if the primary, preferred route to the same destination is withdrawn or otherwise becomes unavailable. Junos determines which of several competing routes to the same prefix becomes active strictly by comparing each route's preference value (administrative distance), with the numerically lowest preference always winning; every routing protocol and static routes themselves carry a default preference (5 for standard static routes), and this value can be explicitly overridden per route using the preference statement under the static route's configuration. To create a floating static route, the administrator deliberately configures a preference value higher (that is, numerically worse, less preferred) than the preference of the primary route it is meant to back up - for example, a value higher than the 5 default of an ordinary static route, or higher than a dynamic protocol's preference such as OSPF's 10 - ensuring the floating route only becomes active once the more-preferred primary route disappears from the table entirely. This preference-based mechanism is the essential, defining configuration element of a floating static route. Priority is not a valid Junos static-route statement, next-hop simply defines where matching traffic is forwarded without controlling route selection behavior, and qualified-next-hop is a related but distinct mechanism used to assign a per-next-hop preference within a single multi-next-hop static route statement rather than between the standalone static route and its dynamic counterpart. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Configuring Floating Static Routes with Preference.
NEW QUESTION # 66
Referring to the exhibit, which router will become the OSPF BDR if all routers are powered on at the same time?
Answer: A
Explanation:
Priority set to 0 will never become DR or BDR so R1 is excluded.
Higher priority is better in OSPF so R2 is lowest than both R3 and R4.
R3 and R4 has the same priority so RID will decide.
R4 has the highest RID so it will become DR and R3 will then become BDR.
NEW QUESTION # 67
Which two statements are correct about martian routes? (Choose two.)
Answer: C,D
Explanation:
Martian routes are never installed in the route table.
Martian routes refer to IP addresses or prefixes that are considered invalid or reserved, and they are not installed in the routing table.
Additional prefixes can be added to the list of martian routes.
Network administrators can configure the system to treat additional prefixes as Martian routes based on specific network policies or requirements.
NEW QUESTION # 68
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