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| Section | Objectives |
|---|---|
| Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Routing Protocols | - IS-IS overview - BGP fundamentals and policy control - OSPF configuration and troubleshooting |
| Layer 2 Switching Technologies | - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts |
| Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
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問題 #171
Which mechanism is used to share routes between routing tables?
答案：C
問題 #172
Referring to the exhibit, which two statements about BGP prefixes advertised by R1 to AS 65501 are true? (Choose two.)
答案：A,C
問題 #173
What determines the preferred route to a destination in an IS-IS network?
答案：C
解題說明：
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.
問題 #174
You want to redistribute the static routes into BGP, but they do not show as BGP routes.
What causes this result to occur?
答案：D
問題 #175
You are troubleshooting a Layer 2 topology issue in a campus network. The switches are running RSTP. You need to verify which switch is currently acting as the root bridge and identify the root port on the local device. Which operational command should the administrator use to view this information?
答案：D
解題說明：
The show spanning-tree bridge command is specifically designed to surface exactly the two pieces of information required in this scenario within a single output. Its Root ID field reports the full Bridge Identifier (priority and MAC address) of whichever switch has been elected root bridge for the spanning-tree instance in question, immediately answering which switch in the campus network is currently acting as root, regardless of whether that happens to be the local device or a remote one. In the same output, the command's Root port field explicitly names the specific local interface (for example, ge-0/0/1.0) that the local switch has selected as its path toward that root bridge, directly answering the second part of the requirement without needing to cross-reference a separate command. Together, these two fields give a complete, immediate picture of both root bridge identity and local root port selection from one operational command. show spanning-tree interface instead presents a per-interface breakdown of STP role (root, designated, alternate, backup) and state across all local ports, which can indirectly reveal the root port by looking for the
'Root' role, but it does not directly report the Root ID/root bridge identity in the same structured way that show spanning-tree bridge does. show ethernet-switching table and show ethernet- switching interface pertain entirely to MAC address learning and switching-specific interface configuration respectively, and neither surfaces any spanning-tree topology or root bridge information at all.
問題 #176
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JN0-352最新題庫資源: https://www.vcesoft.com/JN0-352-pdf.html