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| Section | Objectives |
|---|---|
| Protocol-Independent Routing | - Martian addresses and RIB groups - Static, aggregate, generated routes - Load balancing and filter-based forwarding |
| Layer 2 Switching and VLANs | - Frame processing - Native VLANs and voice VLANs - Ports and VLAN tagging - Bridging components - Inter-VLAN routing |
| BGP | - Attributes and path selection - BGP basic operations and message types - EBGP and IBGP peer interactions |
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Layer 2 Security | - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection - MACsec and storm control - Layer 2 firewall filters |
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NEW QUESTION # 41
Your company has a branch location that uses a Juniper Networks EX Series Switch. You are asked to troubleshoot a spanning-tree issue that keeps reoccurring within the branch environment. After investigation, you discover that end-devices running a virtualization application are generating BPDUs, which are disrupting the spanning-tree topology and causing periodic outages.
Which solution will prevent this problem from reoccurring?
Answer: C
Explanation:
This scenario describes end hosts - virtualization hosts running software switches or virtual bridging stacks
- unexpectedly generating and transmitting BPDUs on ports that are supposed to be pure edge (host-facing) ports where no BPDUs should ever legitimately be received. BPDU protection (BPDU guard) is the Junos feature purpose-built for exactly this situation: when applied to an edge-designated interface, it continuously monitors that port for any incoming BPDU, and the moment one is detected, it immediately and automatically disables the port, preventing the unexpected BPDU source from ever participating in or influencing the spanning-tree topology calculation, thereby protecting the stable, intended topology from disruption caused by unauthorized or accidental BPDU generation at the access edge. This directly and precisely resolves the described problem at its source, since the root cause is illegitimate BPDUs arriving on ports that were never meant to see them. Increasing the max-age timer only adjusts how long stale topology information is retained before being aged out and has no effect on preventing rogue BPDUs from being processed in the first place.
Disabling RSTP outright on access interfaces would eliminate spanning tree's loop-prevention protection on those ports entirely, introducing a much more severe risk of undetected Layer 2 loops. Root protection (root guard) defends specifically against a port attempting to become the root port by receiving a superior BPDU claiming a better path to root; it addresses a different threat model than blocking any BPDU outright on a true edge port. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, BPDU Protection on Edge Interfaces.
NEW QUESTION # 42
Refer to Exhibit:
Click the Exhibit button.
Which two statements about the output shown in the exhibit are correct? (Choose two.)
Answer: B,C
Explanation:
The L column in this output identifies which IS-IS levels are active on each interface, using the standard bitmask where 1 represents Level 1 only and 3 represents both Level 1 and Level 2 combined. Interface ge-0/0
/2.0 shows an L value of 1 and its Level 2 DR field explicitly reads Disabled, meaning Level 2 has not been enabled on that circuit at all; consequently no Level 2 adjacency can ever form there, regardless of what the neighboring router advertises, which confirms that statement as correct. The lo0.0 loopback interface shows Passive under both the Level 1 DR and Level 2 DR columns. A passive IS-IS interface is deliberately excluded from adjacency formation - no IIH PDUs are sent or expected on it - but its associated prefix is still injected into the router's own LSP and flooded throughout the area, which is precisely why loopbacks are configured as passive: to guarantee the router ID/loopback prefix is reachable network-wide without wasting adjacency overhead on an interface with no real neighbor. This confirms that R3 advertises its loopback address, while ruling out the claim that the loopback is used to form an adjacency. Regarding designated routers, all circuits shown here report 'Point to Point' rather than an actual DR system ID, because DR election in IS-IS is a construct exclusive to broadcast (LAN) circuits; point-to-point circuits never elect a DR, so the first statement is false. Reference topics: Junos Enterprise Routing - IS-IS, Interface Levels and Passive Interfaces.
NEW QUESTION # 43
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. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Filter-Based Forwarding and RIB Group Route Leaking.
NEW QUESTION # 44
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?
Answer: B
Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
One key difference:
With aggregated routes any prefix in the routing table counts as a contributing route.
With generated routes only prefix with a valid next-hop qualifies.
NEW QUESTION # 45
Which two statements are true about an EX2300 device? (Choose two.)
Answer: B,C
NEW QUESTION # 46
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