JN0-351 Preparation Materials and JN0-351 Study Guide: Enterprise Routing and Switching, Specialist (JNCIS-ENT) Real Dumps

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Juniper JN0-351 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q168-Q173):

NEW QUESTION # 168
Which two multicast IP addresses are used for link-state update packets? (Choose two.)

Answer: B,D

Explanation:
Link-state update packets are used to flood link-state advertisements (LSAs) among OSPF routers. The destination IP address of these packets depends on the network type and the state of the interface. On broadcast and point-to-point networks, OSPF uses two IP multicast addresses: 224.0.0.5 for all OSPF routers and 224.0.0.6 for all designated routers (DRs) and backup designated routers (BDRs)12. If the interface state is DR or BDR, the link-state update packets are sent to 224.0.0.5. Otherwise, they are sent to 224.0.0.63. On non-broadcast networks, such as Frame Relay or ATM, link-state update packets are sent as unicasts to each adjacent neighbor3. Therefore, the correct answer is A and D. References: Understanding OSPF Areas | Junos OS, How OSPF Works - IP Routing [Book] - O'Reilly Media, Link state packet - Wikipedia


NEW QUESTION # 169
Exhibit

Which command displays the output shown in the exhibit?

Answer: C

Explanation:
The output shown in the exhibit is a brief display of the Ethernet switching table, which shows the learned Layer 2 MAC addresses for each VLAN and interface1.
The command show ethernet-switching table displays the Ethernet switching table with brief information, such as the destination MAC address, the VLAN name, the forwarding state, and the interface name1.
The command show route forwarding-table displays the routing table information for each protocol family, such as inet, inet6, mpls, iso, and so on2. It does not show the Ethernet switching table or the MAC addresses.
The command show ethernet-switching table extensive displays the Ethernet switching table with extensive information, such as the destination MAC address, the VLAN name, the forwarding state, the interface name, the VLAN index, and the tag type1. It shows more details than the brief output shown in the exhibit.
The command show route forwarding-table family ethernet-switching displays the routing table information for the ethernet-switching protocol family, whichshows the destination MAC address, the next-hop MAC address, and the interface name3. It does not show the VLAN name or the forwarding state.


NEW QUESTION # 170
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Answer: B,D

Explanation:
Redundant trunk groups are designed to provide link redundancy. If the primary link fails, the secondary link will automatically take over to ensure continued connectivity.
In redundant trunk groups, while regular data traffic is sent over the primary link, Layer 2 control traffic (such as STP, LACP, etc.) is allowed on the secondary link to maintain network stability and protocol operations.
https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic- map/redundant-trunk-groups.html


NEW QUESTION # 171
You are asked to change the setting for the LSAs age out back to the default value.
In this scenario, which time interval will accomplish this task?

Answer: D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/lsa-refresh- interval-edit-protocols-ospf.html


NEW QUESTION # 172
Which statement is correct about the Junos OS "traceoptions" configuration used for troubleshooting routing protocols?

Answer: B

Explanation:
The "traceoptions" configuration in Junos OS enables detailed logging of protocol-specific events, state changes, and packet exchanges (such as OSPF hello packets or BGP updates), which is invaluable for troubleshooting protocol issues. Traceoptions can be applied at a global level or scoped to a specific protocol instance, and enabling them does not alter the actual operational behavior of the protocol itself.


NEW QUESTION # 173
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