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NEW QUESTION # 66
Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?
Answer: D
NEW QUESTION # 67
The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?
Answer: B
Explanation:
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table.
This means that the routes from inet.0 will be imported into ispi.inet.0.
NEW QUESTION # 68
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: C
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 # 69
You are a network operator troubleshooting BGP connectivity.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
Answer: B,D
Explanation:
The local AS is 65400, as indicated by "Local AS: 65400".
The output shows "NLRI for this session: inet-unicast", which indicates that the routers are exchanging IPv4 unicast routes.
NEW QUESTION # 70
Which statement is correct regarding the Junos OS "show route" command output field
"Preference"?
Answer: A
Explanation:
In Junos OS, the "Preference" field displayed in the output of "show route" represents the administrative distance assigned to a route by its source protocol. When multiple routing protocols advertise a route for the same destination prefix, Junos OS selects the route with the lowest preference value as the active route in the forwarding table.
NEW QUESTION # 71
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