[2025年07月18日] 無料ダウンロードJuniper JN0-649リアル試験問題
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質問 # 109
Referring to the exhibit, which statement is correct?
- A. The route is learned from only one neighbor.
- B. The route is learned from three different neighbors.
- C. The route is learned from a multipath BGP session.
- D. The route is learned from a multihop BGP session.
正解：A
質問 # 110
The connection between DC1 and DC2 is routed as shown in the exhibit.
In this scenario, which statement is correct?
- A. Type 2 and Type 5 routes will be exchanged between DC1 and DC2.
- B. An IP prefix route provides encoding for intra-subnet forwarding.
- C. L3VPN must be enabled to advertise reachability.
- D. The border devices must be able to perform Layer 3 routing and provide IRB functionality.
正解：D
解説：
In the given scenario, the connection between DC1 and DC2 is routed through a Layer 3 network. This indicates that the devices connecting the two data centers must be capable of performing Layer 3 routing to ensure that traffic can be properly forwarded across the network. Additionally, the use of VXLAN suggests that Integrated Routing and Bridging (IRB) functionality is required to enable communication between Layer
2 networks over the Layer 3 infrastructure.
* The border devices (QFX10002) must handle Layer 3 routing to manage IP traffic between the data centers.
* IRB functionality is necessary for routing between VLANs, allowing VXLAN to carry Layer 2 traffic across the Layer 3 network.
References:
* The diagrams indicate the use of VXLAN for Layer 2 extension over a Layer 3 network.
* The need for IRB is suggested by the presence of routed interfaces (IRB1 and IRB2) in the data center diagrams.
* The "Tech Ops Managed Router Juniper Install Guide" provides insights into the Layer 3 routing capabilities and configurations necessary for such setups.
質問 # 111
Which two statements are true about the 802. 1X output shown in the exhibit? (Choose two.)
- A. EAPoL traffic will not be sent out of the use ge-0/0/1 interface
- B. EAPoL traffic will be sent out of the ge-0/0/1 interface.
- C. The supplicant is authenticated using 802. 1X
- D. The supplicant is not authenticated using 802. 1X
正解：B、D
質問 # 112
Your IPv4 multicast network uses different MX Series routers for the source DR and the PIM sparse-mode RP.
What is required before PIM register messages are exchanged between the DR and RP routers?
- A. Enable tunnel services on the DR and RP routers.
- B. Configure PIM encapsulation on the DR and RP routers.
- C. Add a tunnel services PIC to the RP router.
- D. Add an adaptive services PIC to the DR router.
正解：A
質問 # 113
You are using 802.1X in your access network consisting of EX Series switches. You recently had a failure with your RADIUS server which resulted in authenticating client devices being denied access to the network. You want to change this behavior so that authenticating clients are directed to a remediation VLAN. Which RADIUS server failback setting satisfies this requirement?
- A. permit
- B. move
- C. deny
- D. sustain
正解：B
解説：
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/radius-server-configuration- ex-series-cli.html#id-configuring-radius-server-fail-fallback-cli-procedure Permit authentication, allowing traffic to flow from the end device through the interface as if the end device were successfully authenticated by the RADIUS server.
Deny authentication, preventing traffic from flowing from the end device through the interface.
This is the default.
Move the end device to a specified VLAN if the switch receives a RADIUS access-reject message. The configured VLAN name overrides any attributes sent by the server. (The VLAN must already exist on the switch.) Sustain authenticated end devices that already have LAN access and deny unauthenticated end devices. If the RADIUS servers time out during reauthentication, previously authenticated end devices are reauthenticated and new users are denied LAN access.
質問 # 114
You are running OSPF as your IGP. The interfaces connecting two routers are in the ExStart state. You notice that something is incorrect with the configuration. Referring to the exhibit, which statement is correct?
- A. The subnet mask is incorrect.
- B. The MTU setting are incorrect.
- C. The IP addresses are incorrect.
- D. The interface type is incorrect.
正解：C
質問 # 115
You are deploying IP phones in your enterprise networks. When plugged in, the IP phones must be automatically provided with the correct VLAN ID needed for sending voice traffic to the EX Series switches.
In this scenario, which two solutions are required to accomplish this task? (Choose two.)
- A. Enable LLDP-MED on appropriate access interfaces.
- B. Create two VLANs and assign them as VLAN members to the appropriate access interfaces.
- C. Use LLDP on appropriate interfaces.
- D. Enable the voice VLAN feature with the appropriate access interfaces and VLAN ID for voice traffic.
正解：A、D
質問 # 116
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. single supplicant mode
- B. single-secure supplicant mode
- C. multiple supplicant mode
- D. MAC authentication mode
正解：B
解説：
Single supplicant mode authenticates only the first end device that connects to an authenticator port. All other end devices connecting to the authenticator port after the first has connected successfully, whether they are 802.1X-enabled or not, are permitted access to the port without further authentication. If the first authenticated end device logs out, all other end devices are locked out until an end device authenticates. Single-secure supplicant mode authenticates only one end device to connect to an authenticator port. No other end device can connect to the authenticator port until the first logs out.
質問 # 117
Which three MSTP parameters must match on all switches in the same MST region? (Choose three.)
- A. configuration name
- B. revision number
- C. bridge priority
- D. MSTI-to-VLAN mapping
- E. forwarding delay
正解：A、B、D
解説：
https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-configuring-mstp.html
質問 # 118
Referring to the outputs shown in the exhibit, which two statements are correct about the IS-IS adjacency?
(Choose two.)
- A. R1 is configured to participate in Level 2 only.
- B. R1 is configured to participate in both Level 1 and Level 2.
- C. R2 is configured to participate in Level 2 only.
- D. R2 is configured to participate in both Level 1 and Level 2.
正解：B、C
解説：
From the provided IS-IS adjacency outputs:
* R1 is configured to participate in both Level 1 and Level 2 (A): This is indicated by the adjacency states for both Level 1 and Level 2 on the R1 interfaces.
* R2 is configured to participate in Level 2 only (D): This is shown by the adjacency state for Level 2 only on the R2 interfaces.
References:
* The IS-IS adjacency outputs indicate the state and levels of participation for each router.
* Configuration and command references from "Example configs for VMRCAXP01W.txt" and other
* documents provide context for understanding IS-IS states and levels.
質問 # 119
Referring to the exhibit, anycast RP is implemented to ensure multicast service availability. The source is currently sending multicast traffic using group 239.1.1.1 and R3 is receiving PIM register messages, but R2 does not have active source information. In this scenario, what are two methods to receive the active source information on R2? (Choose two.)
- A. Configure an RP set in PIM on R2 and R3, allowing the RPs to forward PIM register messages to the other RPs in the set.
- B. Configure an RP set in PIM on R1, allowing R1 to forward PIM register messages to R2 and R3 in the set.
- C. Configure an MSDP protocol between R2 and R3.
- D. Configure an MSDP protocol between R1 and R2.
正解：A、B
質問 # 120
You are troubleshooting connectivity between an EVPN spine switch configured as a route reflector and a leaf node with an IP address of 10.30.100.6.
Referring to the exhibit, what is the problem?
- A. The neighbor 10.30.100.6 statement is missing from spine1's configuration.
- B. The leaf node is not configured for the family evpn NLRI.
- C. The spine node is not configured for the family inet NLRI.
- D. The neighbor 10.30.100.3 statement is missing from leaf1's configuration.
正解：C
質問 # 121
You notice a mass withdrawal of routes for some of the network hosts. You determine that the link on the ESI interface is down.
Which route type is used in this scenario?
- A. Type 1
- B. Type 2
- C. Type 3
- D. Type 5
正解：A
解説：
https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming- overview.html#jd0e270 This is a Type 1 mandatory route, used for fast convergence and for advertising the split horizon label. It is also known as the mass withdraw route.
質問 # 122
Which two port modes are associated with STP? (Choose two.)
- A. backup port
- B. root
- C. designated
- D. alternate port
正解：B、C
質問 # 123
A user is attempting to watch a high-definition video being streamed from the media server over the network. However, the user complains that the experienced video quality is poor. While logged on to router B, a Juniper Networks device, you notice that video packets are being dropped.
In this scenario, what would solve this problem?
- A. Adjust the scheduler-map to support a higher transmit rate.
- B. Adjust the expedited-forwarding BA classifier on router B's ge-0/0/1 interface to support a higher transmit rate.
- C. Adjust the expedited-forwarding BA classifier to router B's ge-0/0/0 interface to support a higher transmit rate.
- D. Adjust the scheduler for the expedited-forwarding forwarding class to support a higher transmit rate.
正解：D
解説：
Transmit rate is set on the scheduler, BA and classifier do not have transmit rate. scheduler- map=maps schedulers to fwd classes.
質問 # 124
You want to implement an RP in your PIM sparse mode environment, you are considering the advantages and disadvantages of the various RP election methods.
In this scenario, which three implementation guidelines are correct? (Choose three.)
- A. The static method requires configuration on all devices in the PIM domain.
- B. When multiple election methods are implemented on a device, the static method is preferred.
- C. The auto-RP method includes the ability to maintain a backup RP.
- D. The auto-RP method requires using two PIM dense mode groups from the 323/8 range.
- E. With the bootstrap method, the primary criterion for electing a BSR is priority value.
正解：C、D、E
質問 # 125
Which two statements are correct about the deployment of EVPN-VXLAN on QFX Series devices? (Choose two.)
- A. Type 1 route advertisements always have the single-active flag set to 0.
- B. Junos OS supports ingress replication for BUM traffic forwarding.
- C. Junos OS supports underlay replication for BUM traffic forwarding.
- D. Type 1 route advertisements always have the single-active flag set to 1.
正解：B、C
質問 # 126
A user is attempting to watch a high-definition video being streamed from the media server over the network.
However, the user complains that the experienced video quality is poor. While logged on to router B, a Juniper Networks device, you notice that video packets are being dropped.
In this scenario, what would solve this problem?
- A. Adjust the scheduler-map to support a higher transmit rate.
- B. Adjust the expedited-forwarding BA classifier on router B's ge-0/0/1 interface to support a higher transmit rate.
- C. Adjust the expedited-forwarding BA classifier to router B's ge-0/0/0 interface to support a higher transmit rate.
- D. Adjust the scheduler for the expedited-forwarding forwarding class to support a higher transmit rate.
正解：D
解説：
When video packets are being dropped, and the network is configured to use the expedited-forwarding forwarding class, it typically indicates that the scheduler assigned to this class does not have sufficient bandwidth to handle the traffic. Adjusting the scheduler to allocate more bandwidth to the expedited-forwarding class will ensure that video packets are transmitted without being dropped.
Steps:
* Identify the scheduler map: First, identify the scheduler map that is applied to the interfaces. This can be done using the following command:
shell
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show configuration class-of-service scheduler-maps
* Adjust the scheduler: Modify the scheduler for the expedited-forwarding forwarding class to support a higher transmit rate. You can edit the scheduler configuration to increase the bandwidth allocated.
Example:
shell
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set class-of-service schedulers expedited-forwarding transmit-rate percent 30
* Apply the configuration: Apply the modified scheduler to the interfaces using the following commands:
shell
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set class-of-service interfaces ge-0/0/0 scheduler-map <scheduler-map-name> set class-of-service interfaces ge-0/0/1 scheduler-map <scheduler-map-name> commit References:
* Useful Juniper Commands.txt
* Tech Ops Managed Router Juniper Install Guide
質問 # 127
You are using 802.1X authentication in your network to secure all ports. You have a printer that does not support 802.1X and you must ensure that traffic is allowed to and from this printer without authentication.
In this scenario, what will satisfy the requirement?
- A. MAC RADIUS
- B. MACsec
- C. static MAC bypass
- D. MAC filtering
正解：C
解説：
https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/static-mac-bypass-mac-radius-authentication.html
質問 # 128
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The route is a Type 2 EVPN route.
- B. The host that the route is associated with is single-homed to one leaf node.
- C. The route is a Type 1 EVPN route.
- D. The host that the route is associated with is multihomed to two leaf nodes.
正解：A、B
質問 # 129
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. BPDUs from the root bridge for VLAN 10 have been received on the ge-0/0/7.0 interface.
- B. Default VSTP bridge priority values are configured.
- C. BPDUs from the root bridge for VLAN 20 have been received on the ge-0/0/7.0 interface.
- D. DS-1 is the root bridge for VLAN 10.
正解：C、D
質問 # 130
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