[2025年03月]更新のJuniper JN0-649問題集合格率を上げるならJN0-649試験問題集
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質問 # 95
You are asked to establish interface level authentication for users connecting to your network.
You must ensure that only corporate devices, identified by MAC addresses, are allowed to connect and authenticate. Authentication must be handled by a centralized server to increase scalability. Which authentication method would satisfy this requirement?
- A. captive portal
- B. 802.1X with single-secure supplicant mode
- C. 802.1X with multiple supplicant mode
- D. MAC RADIUS
正解：D
解説：
https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/mac- radius-authentication-switching-devices.html You can configure MAC RADIUS authentication on an interface that also allows 802.1X authentication, or you can configure either authentication method alone.
If both MAC RADIUS and 802.1X authentication are enabled on the interface, the switch first sends the host three EAPoL requests to the host. If there is no response from the host, the switch sends the host's MAC address to the RADIUS server to check whether it is a permitted MAC address. If the MAC address is configured as permitted on the RADIUS server, the RADIUS server sends a message to the switch that the MAC address is a permitted address, and the switch opens LAN access to the nonresponsive host on the interface to which it is connected.
質問 # 96
You are asked to deploy 802.1X on your EX Series switches. You need to ensure authenticated devices continue to have access to the network even if the authentication server fails.
Which action meets this configuration objective?
- A. Configure the server fail fallback with a value of sustain.
- B. Set the reauthentication interval to a value of 0.
- C. Configure the static MAC bypass for the authentication server.
- D. Set the reauthentication interval to a value of disable.
正解：A
解説：
https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/concept/802-1x- pnac-divert-authentication-understanding-mx-series.html
質問 # 97
Which address range is used for source-specific multicast?
- A. 232.0.0.0/8
- B. 239.0.0.0/8
- C. 224.2.0.0/16
- D. 233.0.0.0/8
正解：A
質問 # 98
Your campus EX9200 core devices are highly oversubscribed on bandwidth ans reporting massive dropped packets.
To immediately address the issue, you decide to implement shaping on all interfaces.
Which action will accomplish?
- A. Define a CoS output traffic control profile with the shape-rate 5G parameter and apply it to all interfaces.
- B. Apply the shape-rate 5G parameter to all interfaces under the [edit class-of service] hierarchy.
- C. Define a CoS input traffic control profile with the shape-rate 5G parameter and apply it to all interfaces.
- D. Apply the input-shape-rate 5G parameter to all interfaces under the [edit class-of service] hierarchy.
正解：A
解説：
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/cos-shaping-rate- on-physical-interfaces-configuring.html
質問 # 99
Referring to the exhibit, how will router E quickly learn that the remote MAC addresses are no longer reachable through the router attached to the failed link?
- A. Router E receives Type 1 withdrawal messages from router C.
- B. Router E receives Type 2 withdrawal messages from router D.
- C. Router E receives Type 1 withdrawal messages from router D.
- D. Router E receives Type 2 withdrawal messages from router C.
正解：C
質問 # 100
Your enterprise network uses routing instances to support multitenancy. Your Junos devices use BGP to peer to multiple BGP devices. You must ensure that load balancing is achieved within the routing instance.
Which two statements would accomplish this task? (Choose two.)
- A. Configure a load-balance per-packet policy and apply it at the [edit routing-options forwarding-table] hierarchy.
- B. Configure the multipath option at the [edit protocols bgp group] hierarchy.
- C. Configure the multipath option at the [edit protocols bgp group <group-name> neighbor] hierarchy.
- D. Configure the multipath option at the [edit routing-instances <instance-name> routing-options] hierarchy.
正解：A、B
解説：
Fortunately, the Juniper Networks BGP implementation supports the notion of a bandwidth community. This extended community encodes the bandwidth of a given next hop, and when combined with multipath, the load-balancing algorithm distributes flows across the set of next hops proportional to their relative bandwidths. Put another way, if you have a 10-Mbps and a 1-Mbps next hop, on average nine flows will map to the high-speed next hop for every one that uses the low speed.
Use of BGP bandwidth community is supported only with per-packet load balancing.
The configuration task has two parts:
Configure the external BGP (EBGP) peering sessions, enable multipath, and define an import policy to tag routes with a bandwidth community that reflects link speed.
Enable per-packet (really per-flow) load balancing for optimal distribution of traffic.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/load-balancing-bgp-session.html
質問 # 101
What information is contained in an OSPF LSA header? (Choose two.)
- A. options
- B. subnet mask
- C. length
- D. protocol
正解：A、C
質問 # 102
Click the Exhibit button.
You have configured and applied the policer shown in the exhibit to your Junos device.
Which statement is true in this scenario?
- A. Traffic exceeding the committed-burst size will be discarded.
- B. Traffic exceeding the excess-burst size will be discarded.
- C. Traffic exceeding the committed-information-rate will be rate limited.
- D. Traffic exceeding the committed-burst size will be marked with a loss priority of high.
正解：B
解説：
Red--Traffic that exceeds the burst size for peak traffic (EBS), single-rate marks packets with an implicit loss priority of high and, optionally, discards the packets.
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/policer-single-rate-three- color.html
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/topic- map/policer-single-rate-three-color.html
質問 # 103
You are troubleshooting an EVPN-VXLAN IP fabric and observe the loop shown in the exhibit.
Which two steps would you take to further troubleshoot this problem? (Choose two.)
- A. Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 4 routes are present.
- B. Verify that the same ESI is configured on the link from the host and that it matches the source.
- C. Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 3 routes are present.
- D. Verify that the same ESI is configured on the two links from the source.
正解：A、C
解説：
When troubleshooting an EVPN-VXLAN IP fabric loop, the following steps are crucial:
* Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 4 routes are present: Type 4 routes indicate EVPN Ethernet Segment routes, which are essential for detecting and
* mitigating loops.
* Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 3 routes are present: Type 3 routes (Inclusive Multicast Ethernet Tag routes) ensure that multicast and broadcast traffic is properly handled, helping identify and troubleshoot loop issues.
References:
* The commands for verifying BGP EVPN routes are standard in troubleshooting EVPN-VXLAN fabrics.
* Documentation from "Useful Juniper Commands.txt" and "Juniper Commands.pdf" which provide command references for verifying EVPN route types.
質問 # 104
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The BGP neighbor cannot advertise EVPN related routes.
- B. The BGP neighbor cannot advertise L3 VPN related routes.
- C. The BGP neighbor can advertise EVPN related routes.
- D. The BGP neighbor can advertise L3 VPN related routes.
正解：C、D
質問 # 105
Which statement is correct about IS-IS?
- A. IS-IS uses areas and an autonomous system.
- B. Level 1/2 routers automatically inject a default route to the nearest Level 1 router.
- C. Level 1 routers route traffic between autonomous systems.
- D. Level 2 routers must share the same area address.
正解：A
解説：
Level 1/2 routers automatically inject a default route to the nearest Level 1 router. It's the other way around
質問 # 106
Which two statements are correct regarding the behavior shown in the exhibit? (Choose two.)
- A. The router is not an ABR.
- B. The router is an ABR.
- C. The ge-1/1/0 interface is configured as secondary for Area 100.
- D. The ge-1/1/0 interface is configured as secondary for Area 0.
正解：B、C
質問 # 107
You recently committed a change to a router to reject OSPF routes sourced from area 10.
However, you are still seeing area 10 routes in the routing table. Referring to the exhibit, which statement is correct?
- A. The routes remain in the table until the device is rebooted.
- B. The routes remain in the table until the routing daemon is restarted.
- C. The routes only timeout after 24 hours.
- D. The OSPF protocol is first matched by find-ospf and accepted.
正解：B
質問 # 108
The connection between DC1 and DC2 is routed as shown in the exhibit.
In this scenario, which statement is correct?
- A. The border devices must be able to perform Layer 3 routing and provide IRB functionality.
- B. An IP prefix route provides encoding for intra-subnet forwarding.
- C. Type 2 and Type 5 routes will be exchanged between DC1 and DC2.
- D. L3VPN must be enabled to advertise reachability.
正解：A
解説：
https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/concept/evpn- route-type5-understanding.html
質問 # 109
You are asked to configure 802.1X on your access ports to allow only a single device to authenticate. In this scenario, which configuration would you use?
- A. multiple supplicant mode
- B. single supplicant mode
- C. single-secure supplicant mode
- D. MAC authentication mode
正解：B
質問 # 110
You will to route Layer 3 PVLAN traffic within the secondary VLAN.
What is required to accomplish this task?
- A. a community VIAN
- B. an IRB
- C. an FBF policy
- D. an isolated VLAN
正解：B
質問 # 111
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