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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
Topic 1: Tunneling Technologies	- IP tunneling 1. IP-IP tunnels 2. GRE tunnels
Topic 2: Layer 2 Security	- Switch security features 1. MAC limiting 2. Storm control
Topic 3: High Availability	- Junos HA features 1. Graceful restart 2. GRES 3. NSR / NSB - Redundancy mechanisms 1. BFD 2. VRRP
Topic 4: Layer 3 Routing Fundamentals	- Routing protocols 1. BGP fundamentals 2. IS-IS basics 3. OSPF fundamentals and operations - Routing concepts 1. Route preference and policy 2. Protocol-independent routing
Topic 5: 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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q38-Q43):

NEW QUESTION # 38
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

A. generate route
B. static route using qualified next hops
C. aggregate route
D. static route using the resolve feature

Answer: A

Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
One key difference:
With aggregated routes any prefix in the routing table counts as a contributing route.
With generated routes only prefix with a valid next-hop qualifies.

NEW QUESTION # 39
Exhibit.

You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?

A. The max-age must be increased to 20
B. The hello-time must be increased.
C. The force-version must be removed.
D. The bridge priority for EX-4 must be set at 4000.

Answer: C

Explanation:
The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp. This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP1. This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence2.
The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches3. Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning: STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor1.
To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode1.

NEW QUESTION # 40
You are asked to configure a redundant trunk group (RTG). Which two requirements would accomplish this task? (Choose two.)

A. Interfaces within an RTG must be configured as trunk ports.
B. Both interfaces of an RTG must be configured to service the same VLANS.
C. The RTG must be participating in a Spanning Tree topology.
D. Interfaces within an RTG can be configured as access ports.

Answer: A,B

NEW QUESTION # 41
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem?
(Choose two.)

A. Dynamic ARP inspection is enabled on the interface.
B. The device that is connected to the interface has performed a DHCPRELEASE.
C. The device that is connected to the interface has a static IP address.
D. MAC limiting is enabled on the interface.

Answer: B,C

Explanation:
If the device connected to the interface has performed a DHCPRELEASE, it releases its IP address back to the DHCP server, resulting in the removal of the corresponding DHCP snooping entry.
If the device connected to the interface is using a static IP address, it will not send DHCP requests, and therefore no entries will be created in the DHCP snooping database for that device.

NEW QUESTION # 42
Which two statements are correct about IS-IS? (Choose two.)

A. IS-IS uses IPv6 as its transport protocol in the Junos OS implementation.
B. IS-IS sends a maximum metric value of 63 by default.
C. IS-IS only allows you to configure two areas.
D. IS-IS has two metric types and Junos sends both by default.

Answer: B,D

NEW QUESTION # 43
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