100% Pass Quiz Authoritative Juniper - JN0-351 - Exam Enterprise Routing and Switching, Specialist (JNCIS-ENT) Consultant

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Juniper JN0-351 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q66-Q71):

NEW QUESTION # 66
You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

A. The output shows routes that were received prior to the application of any BGP import policies.
B. The routes displayed have traversed one or more autonomous systems.
C. The output shows routes that are active and rejected by an import policy.
D. The routes displayed are being learned from an I BGP peer.

Answer: A,B

Explanation:
The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route's traversal through one or various autonomous systems.
The output displays the selected routes and the attributes with which they were received, but does not show the effects of import policy on the routing attributes.
Nothing indicates that the routes have been received from an IBGP peer. The asterisks only indicates whether the routes have been imported into the routing table (RIB) after the application of the import policies.
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/show-route-receive-protocol.html

NEW QUESTION # 67
Which statement is correct regarding Junos OS unicast reverse path forwarding (RPF) checks?

A. RPF checks require BGP to function.
B. RPF checks are applied only to outbound traffic.
C. RPF checks are used to prevent IP address spoofing by verifying that a packet arrives on the interface that would be used to route back to the source.
D. RPF checks are only used for multicast traffic.

Answer: C

Explanation:
Unicast Reverse Path Forwarding (RPF) is a security mechanism that verifies whether a received packet's source address is reachable through the interface on which it arrived, based on the routing table. If the check fails, indicating a potentially spoofed source address, the packet can be discarded, helping to prevent IP spoofing-based attacks.

NEW QUESTION # 68
You implemented the MAC address limit feature with the shutdown action on all interfaces on your switch.
In this scenario, which statement is correct when a violation occurs?

A. By default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.
B. By default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.
C. By default, you must manually clear the violation for the interface to send and receive traffic again.
D. By default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.

Answer: C

Explanation:
When the MAC address limit feature with the shutdown action is implemented on a switch, if a violation occurs, the interface is disabled and a system log entry is generated. If the switch has been configured with the port-error-disable statement, the disabled interface recovers automatically upon expiration of the specified disable timeout. However, if the switch has not been configured for auto-recovery from port error disabled conditions, you must manually clear the violation by running the clear ethernet-switching port-error command for the interface to send and receive traffic again. This explanation is based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.

NEW QUESTION # 69
What is the default keepalive time for BGP?

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

Answer: A

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 # 70
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

A. alternate
B. backup
C. root
D. disabled
E. designated

Answer: A,B,D

Explanation:
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree 1 2 3 . The roles include root, designated, alternate, backup, and disabled 1 2 3 .
The discarding state is associated with the backup, alternate, and disabled roles 1 2 3 . In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state 2 . Disabled ports are also in the discarding state 3 .
Therefore, options B, C, and D are correct.

NEW QUESTION # 71
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