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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
Topic 1: Protocol Independent Routing	- Static routes, aggregate routes - Routing policy and firewall filters - Routing tables, routing preferences - Configuration, monitoring and troubleshooting
Topic 2: Layer 2 Security	- Layer 2 firewall filters - Port security, storm control, MAC limiting - Dynamic ARP inspection, DHCP snooping - Configuration, monitoring and troubleshooting
Topic 3: Tunnels	- IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting
Topic 4: BGP	- IBGP, EBGP, route policies - BGP concepts, attributes, path selection - Configuration, monitoring and troubleshooting
Topic 5: IS-IS	- IS-IS concepts, levels, routing information - Configuration, monitoring and troubleshooting
Topic 6: OSPF	- Neighbor relationships, route calculation - OSPFv2/v3 concepts, areas, LSA types - Configuration, monitoring and troubleshooting
Topic 7: High Availability	- Virtual Chassis, redundant routing engines - Graceful restart, nonstop active routing - Configuration, monitoring and troubleshooting
Topic 8: Spanning Tree Protocol	- Root bridge, port roles and states - STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting
Topic 9: Layer 2 Switching and VLANs	- Inter-VLAN routing - Layer 2 switching concepts and operation - Configuration, monitoring and troubleshooting - VLAN concepts, tagging, ports, native VLAN

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q150-Q155):

NEW QUESTION # 150
What is the default keepalive time for BGP?

A. 60 seconds
B. 30 seconds
C. 10 seconds
D. 90 seconds

Answer: B

Explanation:
Default BGP keepalive timer in Junos is 30 seconds
The default keepalive time for BGP is 30 seconds, which means that BGP peers send keepalive messages to each other every 30 seconds to verify the liveness of the BGP session. If no keepalive message is received from a peer within the hold time, which is 90 seconds by default, the peer is considered to be unavailable and the BGP session is closed. The keepalive time and the hold time can be configured manually for each BGP peer or peer group, but they must match on both ends of the BGP session. The keepalive time should be one third of the hold time for optimal performance. Therefore, option C is correct and the other options are incorrect. References: BGP keepalive messages and hold time - Juniper Networks

NEW QUESTION # 151
Which statement correctly describes the function of an OSPF stub area's "no-summaries" option (totally stubby area)?

A. It blocks only external (Type 5) LSAs but allows inter-area summary (Type 3) LSAs.
B. It removes the need for an ABR.
C. It blocks both external (Type 5) LSAs and inter-area summary (Type 3) LSAs, relying on a default route for all destinations outside the area.
D. It is only applicable to NSSA areas.

Answer: C

Explanation:
Configuring the "no-summaries" option on a stub area creates a totally stubby area, which blocks both Type 5 external LSAs and Type 3 inter-area summary LSAs from being flooded into the area. Instead, routers within the totally stubby area rely on a single default route, injected by the ABR, to reach all destinations outside the area, further reducing the size of the routing table within the area.

NEW QUESTION # 152
Which two statements are true about high availability on Junos devices? (Choose two.)

A. NSR is independent of helper routers to assist the routing platform in restoring routing protocol information.
B. BFD is slower at detecting failures than default GRE or OSPF timers.
C. BFD is faster at detecting failures than default GRE or OSPF timers.
D. NSR is dependent on helper routers to assist the routing platform in restoring routing protocol information.

Answer: A,C

NEW QUESTION # 153
How many bytes of overhead does an IP-IP tunnel add to a packet?

A. 28 bytes
B. 24 bytes
C. 20 bytes
D. 14 bytes

Answer: C

NEW QUESTION # 154
You have deployed a Juniper EX Series switch in the network. The switch receives a unicast frame destined to a MAC address that is not registered in the bridging table.
Which statement describes the behavior of the switch?

A. The switch performs an ARP request to discover the MAC address of the destination host.
B. The frame is flooded out all ports that are part of the same VLAN, except the receiving port.
C. The switch sends an error message to the sender declaring that the host is unreachable.
D. The frame is flooded out all ports in all VLANs configured on the switch.

Answer: B

Explanation:
According to the Juniper documentation1, when a switch receives a unicast frame destined to a MAC address that is not registered in the bridging table, it floods the frame out all ports that are part of the same VLAN, except the receiving port. This is the default behavior of a switch when it does not know the destination MAC address. The switch does not perform an ARP request, send an error message, or flood the frame to all VLANs. References: Understanding Unicast Flooding | Junos OS | Juniper Networks

NEW QUESTION # 155
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