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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - BPDU, loop and root protection - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters |
| Topic 2: Layer 2 Switching and VLANs | - Inter-VLAN routing - Frame processing - Bridging components - Ports and VLAN tagging - Native VLANs and voice VLANs |
| Topic 3: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 4: BGP | - Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types |
| Topic 5: IS-IS | - Levels, areas and metrics - Link-state database and PDUs - Adjacencies and troubleshooting |
| Topic 6: OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| Topic 7: High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Topic 8: Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| Topic 9: Protocol-Independent Routing | - Static, aggregate, generated routes - Martian addresses and RIB groups - Load balancing and filter-based forwarding |
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NEW QUESTION # 64 
You need to apply a Layer 2 firewall filter on a Juniper Networks EX Series Switch to block traffic from the source MAC address 00:12:34:56:00:07 entering the switch on ge-0/0/3. After committing the configuration, traffic from the MAC address still passes through.
Referring to the exhibit, which statement is correct in this scenario?
Answer: D
Explanation:
The intent of this filter is to match and discard traffic from one single, specific host MAC address, which requires the source-mac-address match condition to reference the complete, exact 48-bit address using an explicit /48 mask (or no mask at all, which Junos treats as an implicit full match) so that only that one precise address is matched. As configured, the term instead specifies a /40 mask on 00:12:34:56:00:07, meaning only the first 40 bits (the first five octets, 00:12:34:56:00) are actually significant to the match, while the sixth octet is effectively wildcarded across its full range; this produces an imprecise, overly broad match criterion rather than the single-host match the administrator intended, and is a common configuration mistake that undermines the predictability and correctness of MAC-based filtering. The lesson tested here is that source and destination MAC address match conditions in Junos firewall filters must be specified with the correct, deliberate, and explicit prefix length appropriate to the intended scope - typically /48 for a single exact host
- rather than an arbitrary or miscalculated mask value. Firewall filters under family ethernet-switching are fully capable of matching on both source-mac-address and destination-mac-address, which rules out that option entirely. Layer 2 MAC-based filters function correctly on both access and trunk interface modes, so interface type is not a limiting factor here. There is no indication in the exhibit that the filter's application direction (input versus output) is reversed. Reference topics: Junos Enterprise Switching - Layer 2 Security, MAC Address Match Conditions and Prefix Length Precision.
NEW QUESTION # 65
Which two characteristics describe the default behavior of aggregate routes? (Choose two.)
Answer: B,D
Explanation:
The entire purpose of route aggregation is summarization - replacing a set of more-specific contributing routes with a single, broader prefix advertised outward - and this summarization inherently hides internal routing instability from external peers: if one of the underlying contributing /24 blocks within a summarized
/16 flaps up and down due to a local link issue, external peers who only see the stable, unchanging /16 aggregate are completely insulated from that churn, since the aggregate itself remains active and advertised as long as at least one contributing route is present, regardless of how much internal fluctuation occurs among the individual contributors. This stability-hiding characteristic is one of the primary operational benefits that motivates using aggregate routes in the first place, confirming that statement as correct. Regarding next-hop behavior, official Juniper documentation is explicit and unambiguous: when an aggregate route is installed in the routing table, Junos assigns it a reject next hop by default, meaning traffic matching only the aggregate (and no more-specific contributor) is dropped and an ICMP unreachable message is returned to the source; a discard next hop is available only as an optional, explicitly configured alternative when silent dropping without ICMP notification is preferred, but it is not the default. Aggregate routes categorically do not advertise their individual contributing routes; suppressing those specific, more-granular prefixes from onward advertisement in favor of the single summary is the aggregate's defining function, directly contradicting the first statement. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Default Reject Next Hop and Route Summarization Benefits.
NEW QUESTION # 66
Which two statements are correct about link aggregation? (Choose two.)
Answer: A,C
NEW QUESTION # 67
Which statement is correct about GRE tunnels?
Answer: B
NEW QUESTION # 68
You are asked to deploy nonstop active routing (NSR) on a dual-Routing Engine platform. In this scenario, what are two additional requirements for proper operation? (Choose two.)
Answer: A,C
Explanation:
Nonstop active routing is specifically engineered to be completely transparent to the rest of the network:
rather than relying on neighboring routers to preserve state during a Routing Engine switchover the way graceful restart does, NSR keeps a fully synchronized instance of the routing protocol process (rpd) running continuously on the backup Routing Engine, mirroring protocol adjacencies, the RIB, and session state in real time. Because neighbors never observe a session reset or restart signal during an NSR-driven switchover, there is no dependency on those neighbors supporting or enabling graceful restart extensions at all - this is the core architectural advantage that distinguishes NSR from GR and is precisely why the first and third answer choices are incorrect distractors. What NSR does require locally is Graceful Routing Engine Switchover (GRES) enabled first, since NSR is built as an extension on top of GRES and depends on it to synchronize kernel and interface state between the two Routing Engines before protocol-level synchronization can occur. Additionally, Juniper's official guidance mandates that both Routing Engines run the identical Junos OS software version; mismatched versions between the primary and backup Routing Engine can introduce incompatible internal data structures or feature behavior during state replication, jeopardizing the integrity of a switchover and is explicitly called out as a hard operational requirement rather than a mere best practice. Reference topics: Junos Enterprise Routing - High Availability, Nonstop Active Routing Requirements and GRES Dependency.
NEW QUESTION # 69
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