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| Section | Objectives |
|---|---|
| Topic 1: IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Topic 2: Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
| Topic 3: Layer 2 Switching and VLANs | - Bridging components - Inter-VLAN routing - Frame processing - Native VLANs and voice VLANs - Ports and VLAN tagging |
| Topic 4: OSPF | - Areas and LSA types - Router ID, adjacencies and neighbors - Link-state database and packet types |
| Topic 5: Protocol-Independent Routing | - Martian addresses and RIB groups - Static, aggregate, generated routes - Load balancing and filter-based forwarding |
| Topic 6: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 7: High Availability | - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG |
| Topic 8: Layer 2 Security | - Layer 2 firewall filters - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection |
| Topic 9: BGP | - Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types |
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NEW QUESTION # 76
Which two statements describe the purpose of a BGP notification message? (Choose two.)
Answer: C,D
Explanation:
A BGP NOTIFICATION message is one of the four core message types defined in RFC 4271, alongside OPEN, UPDATE, and KEEPALIVE, and it serves a very specific and narrow purpose within the protocol: whenever a BGP speaker detects an unrecoverable, fatal condition in the session -- such as a malformed OPEN message, an unsupported capability, a hold-timer expiration, a finite-state-machine error, or an administratively initiated reset -- it transmits a NOTIFICATION message to its peer immediately before closing the underlying TCP connection and tearing down the session entirely. This confirms that a NOTIFICATION always signals the termination of the session upon a fatal error, never a routine, in-session update. Structurally, every NOTIFICATION message carries a defined error code and error subcode field, which together precisely classify the category and specific nature of the fault that triggered the termination (for example, 'Cease' with a subcode indicating administrative shutdown, or 'Update Message Error' with a subcode indicating a malformed attribute), giving the receiving peer's administrator concrete diagnostic information about exactly why the session was torn down.
Updating route attributes while keeping a session alive is the role of the UPDATE message, not NOTIFICATION, and refreshing a neighbor's table without resetting the session describes the optional Route Refresh capability (a separate, distinct BGP mechanism), neither of which describes NOTIFICATION's function.
NEW QUESTION # 77
You are deploying an EX Series switch with a Wi-Fi access point. The access point needs all untagged traffic to use a specific VLAN. In this scenario, which feature should you enable on the switch port?
Answer: C
NEW QUESTION # 78
What determines the preferred route to a destination in an IS-IS network?
Answer: A
Explanation:
IS-IS is a link-state protocol that, like OSPF, runs Dijkstra's Shortest Path First algorithm independently on each router against its own copy of the synchronized link-state database to compute the best path toward every reachable destination. Each link within the topology carries an administrator-assigned or default metric, and as the SPF algorithm walks the topology graph from the local router outward, it sums the metrics of every link traversed along a candidate path to produce that path's total accumulated cost. Among all possible paths to a given destination prefix, IS-IS always selects and installs the path (or, in the case of equal-cost multipath, the set of paths) with the numerically lowest total accumulated metric, exactly mirroring the 'lowest cost wins' principle shared by essentially all link-state IGPs. A higher accumulated metric value is by definition a less preferred, more costly path, making that option the direct inverse of correct IS-IS behavior. Level 2 proximity to the destination has no independent bearing on path selection beyond however it happens to be reflected in the accumulated metric itself -- IS-IS does not apply a separate rule preferring paths merely for passing near a Level 2 router. Likewise, LSP recency (sequence number or freshness) governs which version of a given LSP is trusted and flooded during database synchronization, ensuring the topology database itself is accurate and loop-free, but it plays no role in the SPF cost comparison once the database is synchronized and consistent.
NEW QUESTION # 79
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.
NEW QUESTION # 80
What are two purposes of an aggregate route? (Choose two.)
Answer: B,C
NEW QUESTION # 81
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