Juniper JN0-352 practice test software contains many Juniper JN0-352 practice exam designs just like the real Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-352) exam. These JN0-352 practice exams contain all the JN0-352 questions that clearly and completely elaborate on the difficulties and hurdles you will face in the final JN0-352 Exam. We update our Juniper JN0-352 exam questions bank regularly to match the changes and improve the quality of JN0-352 questions so you can get a better experience.
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - IGMP operation and configuration - Multicast routing monitoring and troubleshooting |
| Topic 2: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
| Topic 3: OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
| Topic 4: Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features |
| Topic 5: Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration |
| Topic 6: BGP | 15-20% | - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection |
| Topic 7: Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing instances and route selection criteria - Routing tables, static routes and route preference |
| Topic 8: IS-IS | 10-15% | - Configuration and route exchange - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics |
| Topic 9: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing |
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NEW QUESTION # 75
What are two characteristics of RSTP alternate ports? (Choose two.)
Answer: A,C
Explanation:
A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port. However, an alternate port does not forward any traffic, as it is in a discarding state. It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port.
C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID.
However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.
NEW QUESTION # 76
Refer to Exhibit:
You have applied a firewall filter as an ingress filter on the ge-0/0/0 interface of your Juniper Networks EX Series Switch as shown in the exhibit. An external host sends an ICMP ping packet to the router.
Which statement is correct about how this packet is processed?
Answer: B
Explanation:
Junos firewall filters evaluate terms sequentially from top to bottom, and a term is only terminal for a packet if its then clause contains an explicit terminating action such as accept, discard, reject, or next term without a match. The count and log actions used in track-icmp are non- terminating; they update statistics and generate a log entry but do not stop evaluation, so a matching ICMP packet falls through to the next term after being counted. The second term, allow- tcp-established, matches only TCP packets carrying the ACK or RST flags as defined by the tcp- established keyword; an ICMP echo request does not satisfy protocol tcp, so this term is skipped entirely and does not accept the packet. Evaluation therefore reaches the implicit catch-all term block-rest, which has no from conditions and matches every remaining packet, incrementing blocked-counter and discarding it. The net effect for the described ICMP ping is that icmp-counter is incremented by the first term, the packet is neither accepted nor rejected by the second term, and blocked-counter is incremented immediately before the packet is silently discarded by the final term. This layered-term behavior, where counting is independent of the accept/discard decision, is a frequently tested nuance of Junos firewall filter processing logic.
NEW QUESTION # 77
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: C
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 # 78
Which statement is correct about how a Juniper Networks EX Series Switch learns MAC addresses?
Answer: B
Explanation:
Layer 2 MAC learning on an EX Series switch, as on any standard Ethernet bridge, is a passive, frame- driven process rather than an active polling or query-based mechanism. Every time a frame arrives on any interface, the switch inspects the frame's source MAC address field and, if that address is not already present in the Ethernet switching (bridge) table for the associated VLAN, creates a new dynamic entry recording the source MAC address, the VLAN it was learned on, and the specific ingress interface through which the frame arrived. Junos also stamps each learned entry with an aging timestamp, which is refreshed every time a subsequent frame from that same source MAC is received; entries that receive no refreshing traffic within the configured MAC aging interval (300 seconds by default) are eventually purged from the table to keep it current and to reclaim table space from hosts that have moved or gone offline. This source- address-driven, per-frame learning process happens continuously and automatically with no dependency on spanning-tree state changes -- although a topology change notification can trigger accelerated aging of the table to flush potentially stale entries faster, learning itself is not gated by or contingent upon such an event occurring. The switch never learns addresses from the destination field of a frame, since the destination address, if already known, is used purely for the forwarding lookup decision, not for populating new table entries.
NEW QUESTION # 79
A GRE tunnel is experiencing fragmentation issues. You confirm that the tunnel is up and is functioning correctly. You confirm that hosts are sending 1500-byte packets. In this scenario, which statement is correct?
Answer: C
Explanation:
GRE encapsulation adds a fixed 24 bytes of overhead to every packet it carries -- 4 bytes for the GRE header itself and 20 bytes for the new outer IPv4 delivery header. When a host transmits a full 1500-byte Ethernet payload into a gr- interface, the resulting encapsulated packet becomes
1524 bytes, which exceeds the physical interface's standard 1500-byte MTU and forces fragmentation or drops if the don't-fragment bit is set. The correct remediation is to reduce the effective MTU seen by end hosts so that encapsulated packets never exceed the physical link's transmission limit. Junos automatically applies this logic to gr-logical interfaces, which default to a
1476-byte protocol MTU (1500 minus 24), but when the underlying physical interface or a manually configured path is involved, administrators must explicitly size the interface MTU to
1476 bytes to prevent post-encapsulation oversize packets. Allowing fragmentation with clear- dont-fragment is a workaround that increases CPU load and can degrade performance rather than solving the root cause, BFD addresses link-failure detection rather than MTU sizing, and ToS copying affects only the type-of-service byte, not packet length.
NEW QUESTION # 80
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