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Juniper JN0-352 Exam Syllabus Topics:

SectionObjectives
Topic 1: High Availability- Link Aggregation Groups and RTG
- Virtual chassis and graceful restart
- VRRP, NSR, NSB and BFD
Topic 2: Layer 2 Switching and VLANs- Bridging components
- Native VLANs and voice VLANs
- Inter-VLAN routing
- Ports and VLAN tagging
- Frame processing
Topic 3: Protocol-Independent Routing- Load balancing and filter-based forwarding
- Static, aggregate, generated routes
- Martian addresses and RIB groups
Topic 4: OSPF- Router ID, adjacencies and neighbors
- Link-state database and packet types
- Areas and LSA types
Topic 5: IS-IS- Link-state database and PDUs
- Levels, areas and metrics
- Adjacencies and troubleshooting
Topic 6: Spanning Tree- Bridge Protocol Data Units (BPDUs)
- Convergence and reconvergence
- STP and RSTP concepts, roles and states
Topic 7: Layer 2 Security- BPDU, loop and root protection
- Layer 2 firewall filters
- MACsec and storm control
- Port security (MAC limiting, DHCP snooping, DAI, IP source guard)
Topic 8: Tunnels- IP tunneling concepts
- GRE and IP-IP configuration and troubleshooting
Topic 9: BGP- EBGP and IBGP peer interactions
- BGP basic operations and message types
- Attributes and path selection

>> JN0-352 Fragen Und Antworten <<

Juniper JN0-352: Enterprise Routing and Switching, Specialist (JNCIS-ENT) braindumps PDF & Testking echter Test

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-352 Prüfungsfragen mit Lösungen (Q166-Q171):

166. Frage
In addition to the MAC addresses, what information is stored in the bridging table? (Choose two.)

Antwort: A,D


167. Frage
Which two statements are correct about IS-IS? (Choose two.)

Antwort: A,D


168. Frage
Which sequence correctly describes the basic message flow that leads to a successful BGP peering session?

Antwort: B

Begründung:
RFC 4271 defines the BGP finite state machine as a strict, ordered progression of six states that a session must move through to successfully establish. A newly configured or reset session always begins in Idle, where BGP initializes resources and refuses connections until the ConnectRetry timer fires. From Idle, the router transitions to Connect and attempts to establish the underlying TCP transport session to the configured peer address on port 179. If that TCP attempt does not immediately succeed, the session falls back to the Active state, where the router continues retrying the TCP connection in the background; once the TCP handshake finally completes (from either Connect or Active), the session advances to OpenSent, during which the router transmits its own BGP OPEN message advertising its AS number, hold time, BGP identifier, and capabilities.
Upon receiving and validating a compatible OPEN message from the peer, the session moves to OpenConfirm, where both sides exchange KEEPALIVE messages to confirm the parameters negotiated in the OPEN exchange are mutually acceptable. Only after this confirmation does the session reach Established, the final state in which UPDATE messages carrying actual routing information begin to flow between the peers.
Any deviation from this Idle # Connect # Active # OpenSent # OpenConfirm # Established ordering, as presented in the other answer choices, does not reflect the standardized BGP state machine. Reference topics:
Junos Enterprise Routing - BGP, The BGP Finite State Machine.


169. Frage
What determines the preferred route to a destination in an IS-IS network?

Antwort: D

Begründung:
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.


170. Frage
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)

Antwort: A,C

Begründung:
Up to 64 Ethernet interfaces can be grouped to form a LAG, and In a Junos Fusion, up to 1,000 LAGs are supported on QFX10002 switches acting as aggregation devices.
The LAG must be configured on both sides of the link.
The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.


171. Frage
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