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| Section | Objectives |
|---|---|
| Topic 1: Spanning Tree | - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence |
| Topic 2: Protocol-Independent Routing | - Martian addresses and RIB groups - Static, aggregate, generated routes - Load balancing and filter-based forwarding |
| Topic 3: IS-IS | - Levels, areas and metrics - Adjacencies and troubleshooting - Link-state database and PDUs |
| Topic 4: Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Frame processing - Bridging components - Ports and VLAN tagging - Inter-VLAN routing |
| Topic 5: BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| Topic 6: High Availability | - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart - Link Aggregation Groups and RTG |
| Topic 7: OSPF | - Link-state database and packet types - Router ID, adjacencies and neighbors - Areas and LSA types |
| Topic 8: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 9: Layer 2 Security | - MACsec and storm control - Layer 2 firewall filters - BPDU, loop and root protection - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
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NEW QUESTION # 57
A switch uses the factory-default storm control configuration. A sudden unknown-unicast burst causes packet loss for only 4-5 seconds before stabilizing.
Which statement describes why normal operation resumes automatically?
Answer: D
Explanation:
The factory-default storm control configuration on EX Series switches operates in a purely rate-limiting mode rather than an interface-shutdown mode. When broadcast, multicast, or unknown-unicast traffic on a port exceeds the configured bandwidth-percentage threshold, the default action is simply to police the offending traffic type and silently drop only the packets that exceed that threshold, while all traffic within the allowed rate continues to be forwarded normally and the interface itself remains administratively and operationally up throughout the event. This explains the observed symptom precisely: during the burst of unknown-unicast frames, the switch dropped the excess volume above the configured limit, producing a brief period of packet loss, but as soon as the burst subsided and traffic fell back under the threshold, storm control simply stopped dropping packets and normal forwarding resumed automatically - no administrative shutdown, recovery timer, or manual intervention was ever involved, because the interface was never taken down in the first place. This default drop-only behavior is distinct from the optional interface-shutdown action, which must be explicitly configured if an administrator wants storm control to disable a port outright on violation (as seen in a related scenario requiring the clear ethernet-switching recovery-timeout command). Storm control by default covers broadcast, multicast, and unknown-unicast traffic types together, not multicast alone, and it has no functional relationship to GRES, which governs Routing Engine redundancy rather than Layer 2 traffic policing. Reference topics: Junos Enterprise Switching - Storm Control, Default Drop Behavior Versus Interface Shutdown Action.
NEW QUESTION # 58 
Click the Exhibit button.
You configure the aggregate route 172.16.0.0/16 on router R1. The routing table currently contains active routes for 172.16.10.0/24 and 172.16.99.0/24. No other more-specific routes exist.
Referring to the exhibit, which statement describes what R1 would do with traffic destined to 172.16.200.5?
Answer: A
Explanation:
The destination address 172.16.200.5 falls within the 172.16.0.0/16 aggregate's summarized range but does not fall within either of the two active, more-specific contributing routes actually present in the table -
172.16.10.0/24 and 172.16.99.0/24 - meaning no route more specific than the /16 itself exists to cover it.
Under Junos's longest-match forwarding logic, the lookup for 172.16.200.5 therefore resolves to the aggregate route itself, and since aggregate routes are installed by default with a reject next hop rather than any real forwarding path, the router drops the packet and simultaneously generates an ICMP destination-unreachable message back to the originating source, explicitly signaling that no valid path exists for that specific destination even though a covering summary is being advertised. This reject behavior is precisely why aggregate routes are valuable for reducing the number of routes advertised upstream while still providing clear, immediate feedback for traffic aimed at address space within the summary that has no genuine underlying route, rather than silently black-holing it or misdirecting it toward an unrelated contributing route's next hop. The aggregate route itself remains active and installed throughout this process - a gap in contributing coverage does not deactivate the aggregate, since the aggregate's activation depends only on at least one contributing route being active, which is satisfied here by both existing /24 blocks. There is also no default route present in this scenario to fall back upon. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Aggregate Route Reject Behavior for Uncovered Address Space.
NEW QUESTION # 59
What are two interarea OSPF LSA types? (Choose two.)
Answer: B,C
NEW QUESTION # 60
What are three valid OSPF adjacency states? (Choose three.)
Answer: A,C,E
Explanation:
OSPF neighbor state progression, as defined in RFC 2328 and displayed by Junos through show ospf neighbor, moves through a well-defined set of named states: Down, Attempt, Init, 2-Way, ExStart, Exchange, Loading, and Full. Down is the initial state, indicating no Hello packets have been recently received from a potential neighbor on that interface; it is a genuine, valid OSPF state and is correctly included here. Init indicates that a Hello packet has been received from the neighbor, but that neighbor has not yet listed the local router's own router ID within its Hello packet, so bidirectional communication has not yet been confirmed; this too is a standard, valid state. Loading occurs after the Exchange state, during which Database Description packets have been fully exchanged and the router is now actively requesting the specific, more-detailed LSAs it identified as missing or outdated from its neighbor via Link State Request packets; it is likewise a standard, valid OSPF neighbor state. 'Established' is not an OSPF state at all - that terminology belongs to BGP's finite state machine, where Established represents the fully operational session state; the OSPF equivalent concept is instead called Full. 'Reject' is not a recognized OSPF neighbor state under any circumstance and does not appear anywhere in the RFC 2328 state machine, making it an invalid distractor as well. Reference topics: Junos Enterprise Routing - OSPF, The OSPF Neighbor State Machine.
NEW QUESTION # 61
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: A
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.
NEW QUESTION # 62
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