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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) |
| Exam Number: | JN0-351 |
| Real Exam Qty: | 65 |
| Exam Format: | Multiple-choice questions |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Exam Price: | $300 USD |
| Related Certifications: | JNCIS-ENT |
| Passing Score: | Not specified (Pass/Fail status available immediately) |
| Sample Questions: | Juniper JN0-351 Sample Questions |
| Exam Way: | Pearson VUE testing centers (In-person) |
| Pre Condition: | Recommended: JNCIA-Junos certification |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html |
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NEW QUESTION # 24
Exhibit
You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?
Answer: C
Explanation:
* The exhibit shows the output of the command show ip bgp , which displays information about the BGP routes in the routing table 1 . The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
* The route from R1 has a local preference of 200, while the route from R2 has a local preference of
100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS) 2 . A higher local preference means a more preferred route 2 .
* BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence 3
. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router 3 . If the weight is equal or not set, the next attribute that is compared is local preference 3 .
* In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers 3 . Therefore, the next attribute that is compared is local preference. Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table 3 . The other attributes, such as origin code and AS path, are not considered in this case.
NEW QUESTION # 25
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?
Answer: D
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 # 26
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)
Answer: A,C
Explanation:
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device 1 .
A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet-switching 2 . The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term 3 .
To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer 3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks 4 .
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface.
Option A is incorrect, because you should not create a family ethernet-switching firewall filter with the appropriate match criteria and actions. A family ethernet-switching firewall filter is used to evaluate Layer 2 traffic on a Juniper device. A family ethernet-switching firewall filter can only match on MAC addresses or VLAN IDs, not on IP addresses or protocols 5 .
Option B is incorrect, because you should not apply the firewall filter to the appropriate VLAN. A VLAN is a logical grouping of hosts that share the same broadcast domain on a Layer 2 network. A VLAN does not have an IP address or routing capability. A firewall filter cannot be applied directly to a VLAN; it must be applied to an interface that belongs to or connects to the VLAN 6 .
References:
1 : Firewall Filters Overview 2 : Configuring Firewall Filters 3 : Configuring Firewall Filter Match Conditions and Actions 4 : Understanding Integrated Routing and Bridging Interfaces 5 : Configuring Ethernet-Switching Firewall Filters 6 : Understanding VLANs
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/task/firewall-filter-qfx- series-cli.html
NEW QUESTION # 27
Referring to the exhibit, what will be the IS-IS adjacency result of the configurations?
Answer: A
NEW QUESTION # 28
An update to your organization ' s network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)
Answer: B,C
Explanation:
To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use the set system management-instance and set routing-instances mgmt_junos commands 1 2 .
* set system management-instance : This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non-default virtual routing and forwarding (VRF) instance 1 . After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic 1 .
* set routing-instances mgmt_junos : This command creates a new routing instance named mgmt_junos
. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos ; you cannot configure any other routing instance by the name mgmt_junos 1 .
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic 1 .
NEW QUESTION # 29
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