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無料Juniper JN0-649テスト練習問題試験問題集
Juniper JN0-649（エンタープライズルーティングとスイッチング、Professional（JNCIP-ENT））認定試験は、ジュニパーネットワークテクノロジーの経験があり、エンタープライズルーティングと切り替えのスキルと知識を検証したいネットワークエンジニアまたは技術者向けに設計されています。この試験では、高度なルーティングテクノロジー、イーサネットスイッチング、仮想化、セキュリティなど、幅広いトピックをカバーしています。 JN0-649試験は、Juniper Networks認定プログラム（JNCP）の一部であり、Juniper認定の最高レベルであるJuniper Networks認定インターネットエキスパート（JNCIE-ENT）の前提条件です。
Juniper JN0-649 認定試験は、高度なエンタープライズルーティングおよびスイッチング技術に関する候補者の知識とスキルをテストする厳しい総合試験です。この試験に合格することで、候補者はプロフェッショナルレベルでのJunos OSルーティングおよびスイッチング技術の設定、トラブルシューティング、および管理の専門知識を証明できます。
質問 # 10
Click the Exhibit.
The ping command shows that connectivity of the 200.0.1/24 network to the 200.0.200.0/24 network exists. You notice that all the ping test results from various devices on 200.0.1.0/24 follow the same path even through equal cost paths exist to the 200.0.200.0/24 network.
Referring to the exhibit, what is happening?
- A. The rip-exp policy needs to be modified to advertise RIP routes
- B. RIPv2 does not support load balancing static routes.
- C. The RIP group must include the preference statement.
- D. Load balancing needs to be enabled for equal cost pathing to work.
正解：D
質問 # 11
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 2 withdrawal messages from router C.
- B. Router E receives Type 1 withdrawal messages from router C.
- C. Router E receives Type 2 withdrawal messages from router D.
- D. Router E receives Type 1 withdrawal messages from router D.
正解：D
質問 # 12
You are asked to merge a RIP network with your OSPF network. As a first step, you establish connectivity between the RIP network and the OSPF network. The RIP network connects to an NSSA area. Which two statements are true in this scenario? (Choose two.)
- A. By default, external OSPF routes have a higher route preference than RIP routes.
- B. To share RIP routes with the OSPF network, an export policy will be required on the ASBR.
- C. To share RIP routes with the OSPF network, an export policy will be required on the ABR.
- D. Be default, RIP routes have a higher route preference than external OSPF routes.
正解：A、B
解説：
Route Preference Values
OSPF Internal = 10
RIP = 100
OSPF External = 150
質問 # 13
A BGP network has been designed to provide resiliency and redundancy to a multihomed customer network.
Which two statements are correct in this scenario? (Choose two.)
- A. The TTL value of 1 is set to limit the scope of the EBGP session.
- B. Both the next hops will be used to forward traffic to R2.
- C. The ttl statement must be configured to accommodate peering to a loopback address of a directly connected peer.
- D. A routing policy will be required to forward traffic to both next hops.
正解：A、D
解説：
B - Because only one next hop in forwarding table.
C- Becuse TTL=1 limiting bgp connection to be established only over loopbacks interface.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/multihop- sessions.html Use the multihop statement to alter the default use of the neighbor's physical address. In addition, you can also specify a time-to-live (TTL) value in the BGP packets to control how far they propagate. We use a TTL value of 1 to ensure that the session cannot be established across any other backdoor links in the network.
質問 # 14
Referring to the exhibit, you configured a new multicast classifier for the ge-1/2/0 interface ICMP traffic to the best-effort queue and traffic from 190.168.20.0/24 to the expedited forwarding queue.
You received noticed that some application are not working after the change.
Which configuration change will remedy the problem?
- A. [edit firewall family inet filter ingress
User@host # set term 3 then next - B. [edit firewall family inet filter ingress
User@host # set term 2 from service-filter hit - C. [edit firewall family inet filter ingress
User@host # set term 3 then accept - D. [edit firewall family inet filter ingress
User@host # set term 2 from protocol tcp
正解：C
質問 # 15
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. 802.1X with multiple supplicant mode
- B. 802.1X with single-secure supplicant mode
- C. captive portal
- 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 # 16
You are currently using VLAN IDs 2 through 300 within your Layer 2 domain and you need to configure VSTP to prevent loops You must ensure that all VL ANs are loop free.
In this scenario, which statement is correct?
- A. You must enable RSTP to account for all VLANs.
- B. You must ensure that the VLANs are balanced between two different root bridges.
- C. You must ensure that the bridge priority is set to the lowest value on all switches in the Layer 2 domain.
- D. You must enable all VLANs, 2 through 300, under the VSTP configuration
正解：D
質問 # 17
Juniper devices use the token bucket algorithm for policing. Which two statements are true regarding the token bucket algorithm? (Choose two.)
- A. Policers enforce gaps between transmitted packets.
- B. Policers reduce the speed of an interface.
- C. Policers transmit streams of traffic at the maximum interface speed until the burst rate is reached.
- D. Policers do not reduce the speed of an interface.
正解：A、D
質問 # 18
You are authenticating user devices connected to your ex Series switch. You have 802.1X and MAC RADIUS configured for all ports. A user is complaining about the time it takes to connect their non- 802.1X device on ge-0/0/15 using MAC RADIUS authentication.
Referring to the exhibit, what should be done to accelerate the authentication process?
- A. Change the supplicant mode to multiple on ge-0/0/15
- B. Configure the restrict feature for MAC RADIUS on ge-0/0/15.
- C. Change the 802.1X retry attempts value to 5 on ge-0/0/15
- D. Configure the no-reauthentication feature for 802.1X on ge-0/0/15
正解：A
質問 # 19
BGP multipath or multihop are not configured in your network. In this scenario, what is the correct sequence for BGP active route selection?
- A. higher local preference
lowest router ID
lowest peer address
lower origin code
shortest AS path - B. higher local preference
shortest AS path
lowest peer address
lowest router ID
lower origin code - C. higher local preference
shortest AS path
lower origin code
lowest router ID
lowest peer address - D. higher local preference
shortest AS path
lowest router ID
lowest peer address
lower origin code
正解：D
質問 # 20
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, a join message is sent from R1 to R5.
- B. Before the formation of the rendezvous-point tree, an IGMP is sent from the Receiver to R1.
- C. Before the formation of the rendezvous-point tree, a join message is sent from R1 to R3.
- D. Before the formation of the rendezvous-point tree, an IGMP is sent from the Source to R5.
正解：B、C
解説：
In a PIM-SM (Protocol Independent Multicast - Sparse Mode) network setup:
* Before the formation of the rendezvous-point tree, a join message is sent from R1 to R3 (RP):
* R1, being the router connected to the receiver, sends a PIM join message towards the RP (R3) to join the multicast group.
* Before the formation of the rendezvous-point tree, an IGMP is sent from the Receiver to R1:
* The receiver sends an IGMP membership report to its directly connected router (R1), indicating its interest in joining a multicast group.
References:
* The behavior of PIM-SM and the process of join messages and IGMP reports are covered in multicast networking sections of network configuration and design guides.
質問 # 21
A customer needs to pass Layer 2 protocols between sites.
Which protocol or standard would be required to implement connectivity on EX4300, EX3400, and EX2300 devices?
- A. Q-in-Q
- B. IGMP
- C. OSPF
- D. VPLS
正解：A
質問 # 22
Your company has expanded into office space across the street. The new office space has a single Ethernet connection connected to an unmanaged switch. You must sort traffic based on the IP address into different VLANs once the traffic arrives on your EX Series switches.
Which mechanism would you use to accomplish this task?
- A. MVRP
- B. filter-based VLANs
- C. dynamic VLANs
- D. Q-in-Q tunneling
正解：B
解説：
https://next-hop-self.com/juniper-filter-based-vlan-assignment.html
https://www.juniper.net/documentation/us/en/software/junos/routing-
policy/topics/example/firewall-filter-ex-series-configuring.html
質問 # 23
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 IP addresses are incorrect.
- B. The MTU setting are incorrect.
- C. The interface type is incorrect.
- D. The subnet mask is incorrect.
正解：B
質問 # 24
You are implementing the route summarization feature of OSPF. Which two results do you achieve in this scenario? (Choose two.)
- A. It provides optimal routing in the network.
- B. It reduced the routing table size, enabling devices to store and process less information.
- C. It reduces the impact of topology changes on a device.
- D. It helps in migrating to future multi-area OSPF network designs.
正解：B、C
解説：
OSPF inter-area route summarization reduces the routing information exchanged between areas and the size of routing tables, and improves routing performance. OSPF inter-area route summarization enables an ABR to summarize contiguous networks into a single network and advertise the network to other areas.
質問 # 25
You are deploying IP phones in your enterprise networks. When plugged in, the IP phones must automatically negotiate the power requirements for the new connection with the EX Series switches.
In this scenario, which protocol should be used to enable this behavior?
- A. LLDP
- B. CDP
- C. MP-BGP
- D. LLDP-MED
正解：D
質問 # 26
Which two multicast listener registration protocols are supported in the Junos operating system?
(Choose two.)
- A. MLD
- B. PIM
- C. DVMRP
- D. IGMP
正解：A、D
解説：
Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) are the Multicast Group Membership Discovery (MGMD) protocols.
質問 # 27
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. Configure a GRE tunnel to encapsulate the L2PT traffic across the WAN.
- B. Disable the BPDU block function on the distribution switch.
- C. Configure the links between the access switches and the distribution switch as a trunk port.
- D. Disable the BPDU block function on the access switches.
正解：C
質問 # 28
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 10.30.100.3 statement is missing from leaf1's configuration.
- B. The spine node is not configured for the family inet NLRI.
- C. The leaf node is not configured for the family evpn NLRI.
- D. The neighbor 10.30.100.6 statement is missing from spine1's configuration.
正解：B
質問 # 29
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. Timers dictate when link state changes are propagated.
- B. MVRP works with RSTP and VSTP.
- C. When enabled, MVRP affects all interfaces.
- D. The forbidden mode does not register or declare VLANs.
正解：D
解説：
When MVRP is enabled, the protocol manages VLAN registration dynamically. In forbidden mode, VLANs are neither registered nor declared on the interface, meaning it prevents VLANs from being learned or propagated.
References:
* Juniper Networks Configuration Guide on MVRP
質問 # 30
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