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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
Layer 2 Security	- DHCP snooping - Dynamic ARP inspection - Common Layer 2 attack mitigation - Port security implementation
OSPF	- OSPF configuration and troubleshooting
High Availability	- VRRP and redundancy protocols - High availability design and integration
Spanning Tree Protocol	- STP topology design and troubleshooting - Port roles interpretation - Convergence issues identification - Bridge priority and port cost optimization - Loop prevention and redundancy
Layer 2 Switching or VLANs	- Frame processing - VLAN concepts and functionalities - Ports and tagging - Inter-VLAN routing - Bridging components - Configuration, monitoring, and troubleshooting - Native VLANs and voice VLANs
IS-IS	- IS-IS configuration and troubleshooting
Protocol Independent Routing	- Routing fundamentals
Tunnels	- Tunnel technologies
BGP	- BGP configuration and troubleshooting

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q50-Q55):

NEW QUESTION # 50
Which statement correctly describes the difference between a BA classifier and a multifield (MF) classifier in Junos OS CoS?

A. MF classifiers are applied only on egress interfaces.
B. A BA classifier examines multiple packet header fields, while an MF classifier examines only one field.
C. BA classifiers and MF classifiers cannot be used together.
D. 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.

Answer: D

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 # 51
You want to ensure traffic is routed through a GRE tunnel. In this scenario, which two statements will satisfy this requirement? (Choose two.)

A. Keepalives must be used on stateless tunneling protocols.
B. BFD must be used on the stateless tunneling protocols.
C. Tunnel endpoints must have a route that directs traffic into the tunnel.
D. All intermediary devices must have a route to the tunnel endpoints.

Answer: C,D

Explanation:
Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.
Option B is correct. All intermediary devices must have a route to the tunnel endpoints. In real- world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.

NEW QUESTION # 52
Which two statements are correct about Integrated Routing and Bridging (IRB) interfaces in Junos OS? (Choose two.)

A. An IRB interface cannot be assigned an IP address.
B. Multiple VLANs can each be associated with their own IRB interface for inter-VLAN routing.
C. IRB interfaces are only supported on routers, not switches.
D. An IRB interface provides Layer 3 routing capability for a VLAN.

Answer: B,D

Explanation:
An Integrated Routing and Bridging (IRB) interface provides a Layer 3 gateway for a Layer 2 VLAN, allowing devices within that VLAN to route traffic to other VLANs or networks. Each VLAN requiring inter-VLAN routing is typically associated with its own IRB interface, configured with an IP address that serves as the default gateway for hosts in that VLAN.

NEW QUESTION # 53
Which three actions are required for filter-based forwarding? (Choose three.)

A. Create a RIB group for next-hop entries.
B. Create routing policies for source addresses.
C. Create a firewall filter to match desired traffic.
D. Create routing instances for individual destinations.
E. Create a forwarding option for load balancing.

Answer: A,B,C

NEW QUESTION # 54
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 hello-time must be increased.
B. The force-version must be removed.
C. The bridge priority for EX-4 must be set at 4000.
D. The max-age must be increased to 20

Answer: B

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 RSTP 1 . 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 sequence 2 .
* The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches 3 . 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 neighbor 1 .
* 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 mode 1 .

NEW QUESTION # 55
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