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JN0-649練習テスト2023年最新ので更新されました
質問 # 31
Remote branches connect to the corporate WAN through access switches. The access switches connect to access ports on the WAN distribution switch, as shown in the exhibit. L2PT has previously been configured on the tunnel Layer 2 traffic across the WAN. You decide to move the L2PT tunnel endpoints to the access switches. When you apply the L2PT configuration to the access switches, the ports that connect the access switches to the distribution switch shut down.
Which action would solve this problem?
- A. Disable the BPDU block function on the access switches.
- B. Configure the links between the access switches and the distribution switch as a trunk port.
- C. Disable the BPDU block function on the distribution switch.
- D. Configure a GRE tunnel to encapsulate the L2PT traffic across the WAN.
正解：B
質問 # 32
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. BPDUs from the root bridge for VLAN 20 have been received on the ge-0/0/7.0 interface.
- B. BPDUs from the root bridge for VLAN 10 have been received on the ge-0/0/7.0 interface.
- C. DS-1 is the root bridge for VLAN 10.
- D. Default VSTP bridge priority values are configured.
正解：A、B
質問 # 33
Which three configuration parameters must match on all switches within the same MSTP region?
(Choose three.)
- A. revision level
- B. configuration name
- C. bridge priority
- D. region name
- E. VLAN to instance mapping
正解：A、B、D
質問 # 34
You ate configuring BGP policies for a site with a dual-homed connection as shown in the exhibit.
You must ensure that inbound traffic from Internet hosts flow through the ISP A connection.
Which statement is correct in this scenario?
- A. Apply a BGP export policy on R1 to assign a lower MED value to routes advertised to ISP A.
- B. Apply a BGP export policy onR2to assign a lower origin value to routes advertised to ISP B.
- C. Apply a BGP export policy to R2 to prepend [65001 65001 65001 65001 65001] to the AS path of routes advertised to ISP B.
- D. Apply a BGP export policy on R1 to assign a higher local preference value to routes advertised to ISP A.
正解：C
質問 # 35
Referring to the exhibit, a PIM-SM network is set up to enable communication between multicast devices.
Which two statements are true? (Choose two.)
- A. Before the formation of the rendezvous-point tree, an IGMP is sent from the Source to R5.
- B. Before the formation of the rendezvous-point tree, a join message is sent from R1 to R3.
- C. Before the formation of the rendezvous-point tree, an IGMP is sent from the Receiver to R1.
- D. Before the formation of the rendezvous-point tree, a join message is sent from R1 to R5.
正解：A、C
質問 # 36
You are redistributing static routes into an OSPF area. Which two statement are true is this scenario? (Choose two.)
- A. The area must be the backbone area.
- B. The area must be stub area.
- C. The external route advertisements have a domain scope.
- D. The routes can be advertised in type LSAs.
正解：A、D
質問 # 37
You are asked to troubleshoot voice quality issues on your newly implement VoIP network. You notice that the voice packets are being dropped. You have verified that the packets are correctly marked for expedited forwarding queue.
Referring to the exhibit, what must you configure to solve the problem?
You are asked to troubleshoot voice quality issues on your newly implement VoIP network. You notice that the voice packets are being dropped. You have verified that the packets are correctly marked for expedited forwarding queue.
Referring to the exhibit, what must you configure to solve the problem?
- A. You must configure a scheduler to allocate bandwidth to the expedited forwarding queue.
- B. You must configure a rewrite rule to ensure that the traffic is scheduled properly in the device.
- C. You must configure a multifield classifier to put the VoIP traffic in the correct queue.
- D. You must configure a policer to ensure that the queue is not being starved.
正解：A
質問 # 38
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 R1, allowing R1 to forward PIM register messages to R2 and R3 in the set.
- B. Configure an MSDP protocol between R1 and R2.
- C. 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.
- D. Configure an MSDP protocol between R2 and R3.
正解：A、C
解説：
https://www.juniper.net/documentation/us/en/software/junos/multicast/topics/ref/statement/rp-set-edit-protocols-pim.html
質問 # 39
Which two statements are correct about the deployment of EVPN-VXLAN on QFX Series devices? (Choose two.)
- A. Junos OS supports ingress replication for BUM traffic forwarding.
- B. Type 1 route advertisements always have the single-active flag set to 0.
- 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：A、C
質問 # 40
You are asked to enforce user authentication using a captive portal before users access the corporate network.
Which statement is correct in this scenario?
- A. HTTPS is the default protocol for a captive portal.
- B. All Web browser requests are redirected to the captive portal until authentication is successful.
- C. When enabled, a captive portal must be applied to each individual interface.
- D. A captive portal can be bypassed using an allowlist command containing a device's IP address.
正解：B
解説：
You can set up captive portal authentication on your switch to redirect all Web browser requests to a login page that requires users to input a username and password before they are allowed access. Upon successful authentication, users are allowed access to the network and redirected to the original page requested. Junos OS provides a customizable template for the captive portal window that allows you to easily design and modify the look of the captive portal login page. You can modify the design elements of the template to change the look of your captive portal login page and to add instructions or information to the page. You can also modify any of the design elements of a captive portal login page. The first screen displayed before the captive login page requires the user to read the terms and conditions of use. By clicking the Agree button, the user can access the captive portal login page. https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/user-authentication-captive-portal.html
質問 # 41
Which two statements about MVRP are correct? (Choose two.)
- A. MVRP PDUs are sent to other switches as periodic intervals.
- B. MVRP is enabled by adding trunk ports under the [edit protocols mvrp] hierarchy.
- C. MVRP monitors interfaces using VSTP and dynamically creates VLANs as necessary
- D. MVRP can propagate dynamic VLANs created on one switch to another switch
正解：A、B
質問 # 42
You are implementing 802.1x access control in your network of EX Series switches. You have some older client devices connecting to your network which do not support 802.1x.
Which statement is true regarding the older devices?
- A. By default, the supplicant will send EAP messages until it reaches a predefined limit, after which it begins to forward traffic.
- B. By default, the authenticator will send EAP messages and keep the port in an unauthorized state.
- C. By default, the authenticator will send EAP messages until it reaches a predefined, after which it begins to forward traffic.
- D. By default, the supplicant will send EAP messages and keep the port in an unauthorized state.
正解：A
質問 # 43
When configuring connectivity to a VoIP enabled phone, which two statements are correct?
(Choose two.)
- A. The telephone device can signal to the switch which VLAN tag it will place on voice traffic.
- B. The switch can signal to the phone device which VLAN tag it should use for voice traffic.
- C. The switch places voice traffic in the expedited forwarding class by default.
- D. The switch places voice traffic in the best-effort forwarding class by default.
正解：B、C
質問 # 44
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 interface type is incorrect.
- B. The subnet mask is incorrect.
- C. The MTU setting are incorrect.
- D. The IP addresses are incorrect.
正解：C
質問 # 45
You have applied the CoS configuration shown in the exhibit to an EX4300 switch.
Which two statements are true? (Choose two.)
- A. Packets in low priority queues are serviced when strict-high priority queues have no available credits
- B. All strict-high priority queues are serviced in a round-robin fashion as long as they have remaining credits
- C. Packets in low priority queues transmit only when start-high priority queues are empty
- D. All strict-high priority queues are serviced in a round-robin fashion regardless of available credits.
正解：B、C
質問 # 46
A modified deficit round-robin scheduler is defined by which three variables? (Choose three.)
- A. WRED
- B. priority
- C. Layer 3 fields
- D. transmit rate
- E. buffer size
正解：A、B、D
質問 # 47
What is a supplicant in 802.1x authentication?
- A. the device being authenticated
- B. the device that prevents the end user device's access until it is authenticated
- C. the RADIUS server
- D. the authenticating device
正解：A
質問 # 48
You have scheduled maintenance operations for one of the devices in your OSPF network.
Referring to the exhibit, which three statements are correct? (Choose three.)
- A. Any traffic destined for networks that terminate on R1 will still be forwarded to R1.
- B. R1 participates in OSPF routing but does not send or receive transit traffic.
- C. R1 does not participate in OSPF routing.
- D. R1 does not send or receive transit traffic during the maintenance window even if no alternative paths exist to the given destination.
- E. The metrics for all transit interfaces on R1 is set to the maximum value of 65,535.
正解：A、B、E
質問 # 49
You enable the Multiple VLAN Registration Protocol (MVRP) to automate the creation and management of virtual LANs.
Which statement is correct in this scenario?
- A. When enabled, MVRP affects all interfaces.
- B. Timers dictate when link state changes are propagated.
- C. MVRP works with RSTP and VSTP.
- D. The forbidden mode does not register or declare VLANs.
正解：A
質問 # 50
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