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Test4Cram offers up to 1 year of free Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) exam questions updates. With our actual questions, you can prepare for the JN0-351 exam without missing out on any point you need to know. These exam questions provide you with all the necessary knowledge that you will need to clear the Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) exam with a high passing score.
NEW QUESTION # 125
You are asked to create a default route that will be advertised to your internal OSPF neighbors. You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available.
Which solution should you implement in this scenario?
Answer: C
Explanation:
The solution that should be implemented in this scenario is to create a default generate route that includes an import policy to match BGP routes from ISP1 and assign a preference value of four or less. This way, the default route will be advertised to the internal OSPF neighbors only when there is a BGP route from ISP1 in the routing table, and it will have a higher preference than any other default route from ISP2 or ISP3. If ISP1 is not available, the default generate route will be withdrawn and the traffic will use the next available default route from ISP2 or ISP3.
Option A is incorrect because creating a default static route with ISP1's address as the next hop while specifying the addresses for ISP2 and ISP3 as qualified next hops with a preference value of six or higher will not ensure that the default route is advertised to the internal OSPF neighbors only when ISP1 is available. The default static route will always be in the routing table regardless of the availability of ISP1, and it will have a lower preference than any other default route from ISP2 or ISP3.
Option C is incorrect because creating a default static route with each neighbor address as the next hop will not ensure that all traffic uses ISP1 as the primary connection and only uses ISP2 and ISP3 when ISP1 is not available. The default static route will always be in the routing table regardless of the availability of ISP1, and it will load balance the traffic among the three ISPs.
Option D is incorrect because creating a default aggregated route will not ensure that the default route is advertised to the internal OSPF neighbors only when ISP1 is available. The default aggregated route will always be in the routing table regardless of the availability of ISP1, and it will not have any preference value associated with it. References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
NEW QUESTION # 126
You are deploying an EX Series switch with a Wi-Fi access point. The access point needs all untagged traffic to use a specific VLAN. In this scenario, which feature should you enable on the switch port?
Answer: A
NEW QUESTION # 127
Which two statements are correct about aggregate routes in Junos OS? (Choose two.)
Answer: A,D
Explanation:
Similar to generated routes, an aggregate route in Junos OS becomes active in the routing table only when at least one contributing (more specific) route matching the aggregate is present.
Administrators can apply a policy to an aggregate route configuration to control which specific contributing routes are eligible to trigger the aggregate, and aggregate routes are commonly configured with a "discard" next hop to prevent routing loops for unused portions of the aggregated address space.
NEW QUESTION # 128
Exhibit
You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?
Answer: A
Explanation:
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down 1 .
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive- time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down 2 .
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel 2 . This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives 3 . Option B is incorrect, because the "event link-adjacency-loss" option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down 4 . Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels 5 .
References:
1 : Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2 : keepalive | Junos OS | Juniper Networks 3 : Configuring Bidirectional Forwarding Detection 4 : event link-adjacency-loss | Junos OS | Juniper Networks 5 : Understanding Link Layer Discovery Protocol
NEW QUESTION # 129
Which two statements are correct about behavior aggregate (BA) classifiers in Junos OS CoS?
(Choose two.)
Answer: B,C
Explanation:
A behavior aggregate (BA) classifier assigns a forwarding class and loss priority to incoming packets based on a single field in the packet header, such as the DSCP value in IP packets or the IEEE 802.1p CoS bits in Ethernet frames. BA classifiers are applied on ingress interfaces to determine how a packet will be treated as it moves through the device.
NEW QUESTION # 130
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