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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
Topic 1: Tunneling Technologies	- IP tunneling 1. GRE tunnels 2. IP-IP tunnels
Topic 2: Layer 2 Security	- Switch security features 1. Storm control 2. MAC limiting
Topic 3: Layer 2 Switching	- VLANs and trunking 1. 802.1Q tagging 2. VLAN configuration and verification - Spanning Tree Protocol (STP/RSTP) 1. Loop prevention mechanisms 2. STP operations and convergence
Topic 4: High Availability	- Redundancy mechanisms 1. BFD 2. VRRP - Junos HA features 1. NSR / NSB 2. Graceful restart 3. GRES
Topic 5: Layer 3 Routing Fundamentals	- Routing concepts 1. Protocol-independent routing 2. Route preference and policy - Routing protocols 1. IS-IS basics 2. OSPF fundamentals and operations 3. BGP fundamentals

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Hot JN0-351 Reliable Test Dumps | Professional Juniper JN0-351: Enterprise Routing and Switching, Specialist (JNCIS-ENT) 100% Pass

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q43-Q48):

NEW QUESTION # 43
A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

A. multicast
B. IPv4
C. IPsec
D. anycast
E. IPv6

Answer: A,B,E

Explanation:
IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network. It supports multiple protocol topologies, including IPv4, IPv6, and multicast.

NEW QUESTION # 44
Exhibit.

Which router will become the OSPF BDR if all routers are powered on at the same time?

A. R2
B. R1
C. R4
D. R3

Answer: C

Explanation:
OSPF DR/BDR election is a process that occurs on multi-access data links. It is intended to select two OSPF nodes: one to be acting as the Designated Router (DR), and another to be acting as the Backup Designated Router (BDR). The DR and BDR are responsible for generating network LSAs for the multi-access network and synchronizing the LSDB with other routers on the same network 1 .
The DR/BDR election is based on two criteria: the OSPF priority and the router ID. The OSPF priority is a value between 0 and 255 that can be configured on each interface participating in OSPF. The default priority is 1. A priority of 0 means that the router will not participate in the election and will never become a DR or BDR. The router with the highest priority will become the DR, and the router with the second highest priority will become the BDR. If there is a tie in priority, then the router ID is used as a tie-breaker. The router ID is a
32-bit number that uniquely identifies each router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address on a loopback interface or any active interface 2 .
In this scenario, all routers have the same priority of 1, so the router ID will determine the outcome of the election. The router IDs are shown in the exhibit as RID values. The highest RID belongs to R4 (10.10.10.4), so R4 will become the DR. The second highest RID belongs to R3 (10.10.10.3), so R3 will become the BDR.
References:
1 : OSPF DR/BDR Election: Process, Configuration, and Tuning 2 : OSPF Designated Router (DR) and Backup Designated Router (BDR)

NEW QUESTION # 45
Which two statements are correct about the Junos OS "load balancing" per-packet feature using an equal-cost multipath (ECMP) policy? (Choose two.)

A. ECMP allows traffic to be distributed across multiple equal-cost paths to the same destination.
B. A routing policy with a "load-balance per-packet" action must be applied to enable ECMP forwarding in Junos OS.
C. ECMP only works with OSPF, not BGP.
D. ECMP requires all paths to have different metrics.

Answer: A,B

Explanation:
Equal-cost multipath (ECMP) allows traffic to be distributed across multiple paths of equal cost toward the same destination, improving link utilization and providing redundancy. In Junos OS, a routing policy with the "load-balance per-packet" action must typically be applied to the forwarding table to enable this per-flow (or per-packet) load balancing behavior across the equal-cost paths, and ECMP can be used with multiple protocols, including OSPF and BGP.

NEW QUESTION # 46
Which statement is correct about the Junos OS "traceoptions" configuration used for troubleshooting routing protocols?

A. Traceoptions permanently modify the routing protocol's behavior.
B. Traceoptions require a reboot to take effect.
C. Traceoptions enable detailed logging of protocol events and packets, useful for troubleshooting without affecting protocol operation.
D. Traceoptions can only be applied globally, not per protocol.

Answer: C

Explanation:
The "traceoptions" configuration in Junos OS enables detailed logging of protocol-specific events, state changes, and packet exchanges (such as OSPF hello packets or BGP updates), which is invaluable for troubleshooting protocol issues. Traceoptions can be applied at a global level or scoped to a specific protocol instance, and enabling them does not alter the actual operational behavior of the protocol itself.

NEW QUESTION # 47
Which statement correctly describes the difference between a BA classifier and a multifield (MF) classifier in Junos OS CoS?

A. BA classifiers and MF classifiers cannot be used together.
B. An MF classifier can match on multiple fields, such as source/destination address and port, in addition to CoS markings, providing more granular classification than a BA classifier.
C. MF classifiers are applied only on egress interfaces.
D. A BA classifier examines multiple packet header fields, while an MF classifier examines only one field.

Answer: B

Explanation:
While a behavior aggregate (BA) classifier assigns forwarding class and loss priority based on a single field such as DSCP or 802.1p bits, a multifield (MF) classifier, implemented using firewall filter match conditions, can classify traffic based on multiple packet attributes, including source/destination IP address, port numbers, and protocol, in addition to any existing CoS markings, providing much finer-grained classification control.

NEW QUESTION # 48
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