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| Section | Weight | Objectives |
|---|---|---|
| BGP | 15-20% | - Neighbor relationships and session establishment - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting |
| 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 |
| IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - IGMP operation and configuration - Multicast routing monitoring and troubleshooting |
| Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
| 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 |
| OSPF | 15-20% | - Route summarization and redistribution - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting |
| High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting |
| Protocol Independent Routing | 10-15% | - Routing tables, static routes and route preference - Basic routing policy and filter operation - Routing instances and route selection criteria |
| IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting - Configuration and route exchange |
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NEW QUESTION # 155
In a LAN segment, which tie-breaker would spanning tree consider if equal-cost paths exist between two or more switches to the root bridge?
Answer: A
NEW QUESTION # 156
Which statement describes how a generated route determines its next hop?
Answer: A
Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least-specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here.
NEW QUESTION # 157
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: C
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 # 158
You want to configure a floating static route. What must be configured in this scenario?
Answer: B
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.
NEW QUESTION # 159
Which two types of tunnels are able to be created on all Junos devices? (Choose two.)
Answer: B,D
Explanation:
GRE tunnels can be created on all Junos devices. GRE is a tunneling protocol that encapsulates a wide variety of network layer protocols inside virtual point-to-point links.
IP-IP tunnels can also be created on all Junos devices. IP-IP tunneling is used to encapsulate IP packets within IP packets, providing a simple way to tunnel IP traffic.
NEW QUESTION # 160
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