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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Switching Technologies | - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts |
| Topic 2: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 3: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Topic 4: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 5: Routing Protocols | - OSPF configuration and troubleshooting - IS-IS overview - BGP fundamentals and policy control |
| Topic 6: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
>> JN0-352 Standard Answers <<
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NEW QUESTION # 110
You are receiving the BGP route shown in the exhibit from four different upstream ISPs.
Referring to the exhibit, which ISP will be selected as the active path?
Answer: C
Explanation:
In BGP, the path selection process is based on a set of attributes. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on. If all these attributes are the same, then it prefers the path with the shortest AS path.
Referring to the exhibit, all four ISPs have the same weight, local preference, and origin.
However, ISP 4 has the shortest AS path. Therefore, ISP 4 will be selected as the active path.
So, option C is correct.
NEW QUESTION # 111
Which IS-IS TLV should be used to advertise information about the router's neighbors and link metrics?
Answer: D
Explanation:
TLV 22, the Extended IS Reachability TLV defined in RFC 5305, is the modern and Junos-preferred mechanism for advertising a router's adjacent neighbors together with the metric associated with each link. It carries the seven-octet system ID and pseudonode number of each neighbor along with a 24-bit wide metric field, and supports an extensible set of sub-TLVs used for traffic-engineering data such as interface and neighbor IP addresses, bandwidth, and administrative groups. The original IS Reachability TLV, TLV 2, defined in the base ISO 10589 standard, carries similar neighbor and metric information but is constrained to a 6-bit narrow metric with a maximum value of 63, which is inadequate for expressing meaningful cost differentiation in modern, high-capacity enterprise and service-provider topologies; consequently, Junos deployments are commonly configured for wide-metrics-only, favoring TLV 22 over the legacy TLV 2 whenever traffic-engineering-capable or simply more granular metric representation is desired. TLV 132, the IP Interface Address TLV, only advertises the IPv4 addresses configured on the originating router's interfaces and carries no neighbor-adjacency or metric information. TLV 129, the Protocols Supported TLV, merely lists which network-layer protocols (such as IPv4 or IPv6) the originating router is capable of routing, and likewise has nothing to do with neighbor reachability or link cost. Reference topics: Junos Enterprise Routing
- IS-IS, Extended IS Reachability and Wide Metrics.
NEW QUESTION # 112
Which two actions are performed by the firewall filter shown in the exhibit? (Choose two.)
Answer: A,C
NEW QUESTION # 113
You enable the point-to-point parameter on your OSPF interface configuration. In this scenario, what are two benefits of this action? (Choose two.)
Answer: B,D
Explanation:
Configuring interface-type p2p under an OSPF interface tells Junos to treat that interface as a point-to-point network type regardless of the underlying physical medium, which removes the interface from the standard broadcast-network state machine entirely. On a true broadcast network, two routers must first complete a Designated Router and Backup Designated Router election, wait through the associated timers, and only then proceed through 2-Way, ExStart, Exchange, and Loading before reaching Full -- a multi-step process. A point-to-point interface skips DR/BDR election altogether and proceeds directly from 2-Way into ExStart, so adjacencies form measurably faster, which is the first correct benefit. Because there is no DR on a point-to- point interface, Junos also does not generate a Type 2 Network LSA to describe the segment; the connected subnet is instead advertised as a simple stub-network entry inside the Router LSA itself, eliminating an entire LSA type from the area's link-state database and reducing its overall size, which is the second correct benefit. Point-to-point configuration is entirely incompatible with DR election, so a router configured this way cannot 'win' a DR election -- there is no DR to win.
Advertisement of the connected network happens on any operational OSPF interface irrespective of network type, so that option describes normal OSPF behavior rather than a benefit specific to the point-to-point setting.
NEW QUESTION # 114
Click the Exhibit button. You run the show ospf database command and you see a Router LSA marked with an asterisk.
Referring to the exhibit, what is the significance of this result?
Answer: D
Explanation:
In the output of show ospf database, Junos marks every self-originated link-state advertisement with an asterisk immediately preceding the LSA's link-state ID. A self-originated LSA is one that was created and flooded by the router on which the command is being executed, as opposed to an LSA that was received from and originated by a neighboring router elsewhere in the area. In this exhibit, the asterisked Router LSA has an ID of 10.101.100.0 and an Advertising Router value of the same 10.101.100.0, confirming that this particular Router LSA describes the local device's own links, area membership, and interface costs, and that the local router itself flooded this LSA into the area's link- state database. This distinction matters operationally because when troubleshooting OSPF topology or SPF calculation issues, engineers frequently need to isolate their own router's advertised state from the states advertised by every other router in the area; the asterisk provides an immediate, unambiguous visual cue for that separation without needing to cross-reference the router's own ID separately. It has no relationship to designated router or backup designated router status -- DR/BDR roles are indicated elsewhere in interface-level output, not through the asterisk convention in the LSA database dump, and a router that is neither DR nor BDR still self-originates and flags its own Router LSA the same way.
NEW QUESTION # 115
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