JN0-351 Exam Syllabus | New JN0-351 Exam Book

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Juniper JN0-351 Exam Syllabus Topics:

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

>> JN0-351 Exam Syllabus <<

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q21-Q26):

NEW QUESTION # 21
Which two statements are correct about aggregate routes in Junos OS? (Choose two.)

A. Aggregate routes cannot have their next hop set to "discard."
B. Aggregate routes can be configured with a policy to control which contributing routes are included.
C. An aggregate route becomes active only when at least one contributing route is present, similar to a generated route.
D. An aggregate route is installed in the routing table regardless of whether contributing routes exist.

Answer: B,C

Explanation:
Similar to generated routes, an aggregate route in Junos OS becomes active in the routing table only when at least one contributing (more specific) route matching the aggregate is present.
Administrators can apply a policy to an aggregate route configuration to control which specific contributing routes are eligible to trigger the aggregate, and aggregate routes are commonly configured with a "discard" next hop to prevent routing loops for unused portions of the aggregated address space.

NEW QUESTION # 22
Which two statements are true about the default VLAN on Juniper switches? (Choose two.)

A. The default VLAN is set to a VLAN ID of 1 by default
B. The default VLAN ID can be changed.
C. The default VLAN ID is not assigned to any interface.
D. The default VLAN ID is not visible.

Answer: A,B

Explanation:
On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default 1 2 . This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN 1 2 .
Therefore, option A is correct.
The default VLAN ID can be changed 1 2 . This allows network administrators to configure the switch to use a different VLAN as the default, if necessary 1 2 . Therefore, option D is correct.

NEW QUESTION # 23
You have configured a GRE interface, but no traffic will flow.
Referring to the exhibit, which statement is true?

A. The gr-1/2/0 interface is an invalid GRE interface.
B. The unit number cannot be 0.
C. The source and destination addresses cannot have the same third octet.
D. The IP subnet mask cannot be a /32.

Answer: D

NEW QUESTION # 24
Which statement is correct about controlling the routes installed by a RIB group?

A. A firewall filter must be configured to install routes in the RIB groups.
B. An export policy is applied to the RIB group.
C. Only routes in the last table are installed.
D. An import policy is applied to the RIB group.

Answer: D

Explanation:
A RIB group is a configuration that allows a routing protocol to install routes into multiple routing tables in Junos OS. A RIB group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table or group. A RIB group can also include an import-policy statement, which specifies one or more policies to control which routes are imported into the destination routing table or group 1 .
An import policy is a policy statement that defines the criteria for accepting or rejecting routes from the source routing table. An import policy can also modify the attributes of the imported routes, such as preference, metric, or community. An import policy can be applied to a RIB group by using the import-policy statement under the [edit routing-options rib-groups] hierarchy level 1 .
Therefore, option A is correct, because an import policy is applied to the RIB group to control which routes are installed in the destination routing table or group. Option B is incorrect, because all routes in the source routing table are imported into the destination routing table or group, unless filtered by an import policy.
Option C is incorrect, because a firewall filter is not used to install routes in the RIB groups; a firewall filter is used to filter packets based on various criteria. Option D is incorrect, because an export policy is not applied to the RIB group; an export policy is applied to a routing protocol to control which routes are advertised to other devices.
References:
1 : rib-groups | Junos OS | Juniper Networks
https://www.juniper.net/documentation/us/en/software/junos/static-routing/topics/ref/statement/rib-groups- edit-routing-options.html

NEW QUESTION # 25
What are two characteristics of RSTP alternate ports? (Choose two.)

A. RSTP alternate ports provide an alternate higher cost path to the root bridge.
B. RSTP alternate ports are active ports used to forward frames toward the root bridge.
C. RSTP alternate ports provide an alternate lower cost path to the root bridge.
D. RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.

Answer: A,D

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 1 . However, an alternate port does not forward any traffic, as it is in a discarding state 2 . 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 1 .
* 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 3 . However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself 1 .
Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.

NEW QUESTION # 26
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