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| Section | Objectives |
|---|---|
| Topic 1: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 2: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 3: Routing Protocols | - OSPF configuration and troubleshooting - IS-IS overview - BGP fundamentals and policy control |
| Topic 4: Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Topic 5: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 6: Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
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NEW QUESTION # 168
What are two purposes of an aggregate route? (Choose two.)
Answer: C,D
NEW QUESTION # 169
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: B
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.
NEW QUESTION # 170
Which statement is correct about the exhibit?
Answer: D
NEW QUESTION # 171
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 # 172
An EBGP session sources its TCP connection from which IP address?
Answer: A
NEW QUESTION # 173
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