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JN0-351入門知識、JN0-351トレーリング学習
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Juniper JN0-351 認定試験の出題範囲:
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Juniper JN0-351トレーリング学習、JN0-351 PDF
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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q58-Q63):
質問 # 58
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.)
- A. You should apply the firewall filter to the appropriate IRB interface.
- B. You should apply the firewall filter to the appropriate VLAN.
- C. You should create a family Ethernet-switching firewall filter with the appropriate match criteria and actions.
- D. You should create a family inet firewall filter with the appropriate match criteria and actions.
正解:A、D
解説:
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. 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. 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. 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.
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
質問 # 59
Which three actions are required for filter-based forwarding? (Choose three.)
- A. Create a forwarding option for load balancing.
- B. Create routing instances for individual destinations.
- C. Create a RIB group for next-hop entries.
- D. Create a firewall filter to match desired traffic.
- E. Create routing policies for source addresses.
正解:C、D、E
質問 # 60
Your network has two ISPs available. You want to ensure that all outbound traffic is routed out ISP-1. If the connection to ISP-1 fails, all outbound traffic is routed to the backup ISP, ISP-2. In this scenario, how should you configure BGP on your network?
- A. Set the local-preference attribute to a higher value for ISP-1 than ISP-2.
- B. Configure the gateway for ISP-1 with a higher peer ID than the gateway for ISP-2.
- C. Set the local-preference attribute to a higher value for ISP-2 than ISP-1.
- D. Configure the gateway for ISP-1 with a higher origin code than the gateway for ISP-2.
正解:A
質問 # 61
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?
- A. LLDP needs to be removed from the gr-1/1/10.1 interface.
- B. For GRE tunnels, the OAM protocol requires that the BFD protocols also be used.
- C. The "event link-adjacency-loss" option must be set.
- D. The hold-time value must be two times the keepalive-time value
正解:D
解説:
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 down1.
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 down2.
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel2. 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 keepalives3. 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 down4. 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 tunnels5.
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
質問 # 62
Which two multicast IP addresses are used for link-state update packets? (Choose two.)
- A. 224.0.0.10
- B. 224.0.0.5
- C. 224.0.0.6
- D. 224.0.0.9
正解:B、C
質問 # 63
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