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JN0-649テストエンジンお試しセット、JN0-649問題集PDF
Juniper JN0-649 Enterprise Routing and Switching、Professional（JNCIP-ENT）試験は、企業ルーティングおよびスイッチング技術に特化したITプロフェッショナル向けに設計された認定試験です。この試験は、ルーティング技術、スイッチング技術、セキュリティ技術、トラブルシューティング、およびJunos OSの基礎に関する候補者の知識とスキルを試験します。これは、企業ネットワーキングとルーティングプロトコルの綿密な理解を必要とする包括的な試験です。
質問 # 38
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 policer to ensure that the queue is not being starved.
- C. You must configure a multifield classifier to put the VoIP traffic in the correct queue.
- D. You must configure a rewrite rule to ensure that the traffic is scheduled properly in the device.
正解：A
質問 # 39
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 expedited-forwarding BA classifier to router B's ge-0/0/0 interface to support a higher transmit rate.
- B. Adjust the scheduler-map to support a higher transmit rate.
- C. Adjust the scheduler for the expedited-forwarding forwarding class to support a higher transmit rate.
- D. Adjust the expedited-forwarding BA classifier on router B's ge-0/0/1 interface to support a higher transmit rate.
正解：C
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 # 40
You are adding VNI 101 to your EVPN-VXLAN network, but traffic is not being sent to received.
Referring to the exhibit, which configuration statement will solve the problem?
- A. set routing-instances EVPN1 vxlan encapsulate-inner-vlan
- B. set routing-instances EVPN1 instance-type evpn
- C. set routing-instances EVPN1 vrf-table-label
- D. set routing-instances EVPN1 bridge-domains BD-101 vxlan vni 101
正解：B
質問 # 41
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The DS-2 switch will be root bridge for MSTI 1.
- B. The DS-1 switch will be root bridge for MSTI 1.
- C. The DS-2 switch will be root bridge for MSTI 2.
- D. The DS-1 switch will be root bridge for MSTI 2.
正解：A、C
質問 # 42
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 only timeout after 24 hours.
- B. The OSPF protocol is first matched by find-ospf and accepted.
- C. The routes remain in the table until the device is rebooted.
- D. The routes remain in the table until the routing daemon is restarted.
正解：B
解説：
Once a route is accepted, no other terms in the routing policy are evaluated.
質問 # 43
Your network has Junos Fusion configured with MX960 routers as aggregation devices (AD) and QFX5100 switches as satellite devices (SO) Which two statements are coned in this scenario?
(Choose two )
- A. The AD runs the Junos software for all its connected SDs.
- B. The Fusion extended ports are configured on the SDs.
- C. All SDs connected to a single AD must use the same software version.
- D. SDs are added to the AD by configuring the cascade port on the AD.
正解：B、D
質問 # 44
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. MP-BGP
- B. LLDP-MED
- C. LLDP
- D. CDP
正解：B
解説：
LLDP-MED (Link Layer Discovery Protocol-Media Endpoint Discovery) is an extension of LLDP (Link Layer Discovery Protocol) that provides additional functionalities specifically for voice over IP (VoIP) devices, including automatic negotiation of power requirements. This protocol is essential for automatically negotiating power with IP phones when they are connected to EX Series switches.
Steps:
* Enable LLDP-MED:
set protocols lldp-med
* Configure LLDP-MED on the interfaces:
set interfaces ge-0/0/0 unit 0 family ethernet-switching port-mode access set interfaces ge-0/0/0 unit 0 family ethernet-switching interface-mode access set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members default set interfaces ge-0/0/0 unit 0 family ethernet-switching storm-control default
* Commit the configuration:
References:
* Useful Juniper Commands.txt
* Tech Ops Managed Router Juniper Install Guide
質問 # 45
A customer on MSTI-2 was isolated due to a physical link outage on Switch 5's ge-0/0/32 interface.
Referring to the exhibit, which corrective action would solve this problem?
- A. replace the link between Switch 5 and 6 with a 10 Gbps link
- B. Add MSTI-2 to all interfaces on Switch 5.
- C. Implement the CIST on all switches.
- D. Move the root bridge for MSTI-2 to Switch 6.
正解：B
質問 # 46
Which type of BGP is used to peer with a different autonomous system?
- A. static
- B. external
- C. classless
- D. dynamic
正解：B
質問 # 47
You are asked to configure an 802.1X solution that supports dynamic VLAN assignment.
In this scenario, which two modes support using vendor-specific attributes (VSAs)? (Choose two.)
- A. static MAC bypass mode
- B. single-secure supplicant mode
- C. single supplicant mode
- D. multiple supplicant mode
正解：B、D
解説：
Dynamic VLAN assignment using 802.1X authentication relies on vendor-specific attributes (VSAs) to assign VLANs dynamically based on the authentication results. The modes that support using VSAs for dynamic VLAN assignment are:
* Single-Secure Supplicant Mode: This mode supports a single secure client on a port and can use VSAs to dynamically assign VLANs based on the authentication result.
* Multiple Supplicant Mode: This mode supports multiple clients on a single port, each with its own authentication session, and can use VSAs to dynamically assign VLANs.
References:
* The Juniper documentation and configuration guides discuss the capabilities of these modes in supporting dynamic VLAN assignment through VSAs. Specific configuration examples and guidelines can be found in the documents:
* Useful Juniper Commands.txt
* Tech Ops Managed Router Juniper Install Guide
# Example of enabling single-secure supplicant mode
set protocols dot1x authenticator interface ge-0/0/1.0 supplicant multiple
# Example of enabling multiple supplicant mode
set protocols dot1x authenticator interface ge-0/0/1.0 supplicant multiple
質問 # 48
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. L3VPN must be enabled to advertise reachability.
- D. Type 2 and Type 5 routes will be exchanged between DC1 and DC2.
正解：A
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 # 49
You are investigating reports of increased latency and discover that some routes cause customer traffic to traverse a route reflector instead of the optimal path.
Referring to the exhibit, which configuration statement would solve the problem?
- A. set protocols bgp group BGP-HESH import NHS
- B. delete protocol bop group BGP-MESH export NH3
- C. delete protocols bgp group BGP-MESH peer-as
- D. set policy-option, policy-statement NHS term BGP_ROUTES from external
正解：D
質問 # 50
Referring to the exhibit, which statement is correct when a failure exists on the link between host2 and switch5 on this EVPN-VXLAN fabric?
- A. The switch5 device will send a Type 3 route to all peers.
- B. The switch5 device will send a Type 2 route to all peers.
- C. The switch5 device will send a Type 4 route to all peers.
- D. The switch5 device will send a Type 1 route to all peers.
正解：D
解説：
Type 1 routes are used for per-ES auto-discovery (A-D) to advertise EVPN multi-homing mode.
Remote ToR leaf devices in the EVPN network use the EVPN Type 1 route type functionality to learn the EVPN Type 2 MAC routes from other leaf devices. In this route type ESI and the Ethernet Tag ID are considered to be part of the prefix in the NLRI. Upon a link failure between ToR leaf and end server VTEP withdraws Ethernet Auto-Discovery routes (Type 1) per ES. The Juniper EVPN multi-homing Ethernet Tag value is set to the VLAN ID for ES auto-discovery/ES route types.
Mass Withdrawal - Used for fast convergence during link failure scenarios between leaf devices to the end server using Type 1 EAD/ES routes.
質問 # 51
You must ensure that all routes in the 10.0.0/8 address range are not advertised outside of your AS. Which well-known BGP community should be assigned to these addresses to accomplish this task?
- A. no-peer
- B. internet
- C. no-advertise
- D. no-export
正解：D
解説：
For specifying the BGP community attribute only, you also can specify community-ids as one of the following well-known community names defined in RFC 1997:
no-advertise - Routes containing this community name are not advertised to other BGP peers.
no-export - Routes containing this community name are not advertised outside a BGP confederation boundary.
no-export-subconfed - Routes containing this community are advertised to IBGP peers with the same AS number, but not to members of other confederations.
llgr-stale - Adds a community to a long-lived stale route when it is readvertised.
no-llgr - Marks routes which a BGP speaker does not want to be retained by LLGR. The Notification message feature does not have any associated configuration parameters.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/community- edit-routing-options.html
質問 # 52
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 MTU setting are incorrect.
- B. The interface type is incorrect.
- C. The IP addresses are incorrect.
- D. The subnet mask is incorrect.
正解：A
質問 # 53
Referring to the exhibit, traffic ingresses on interface ge-0/0/3 and egresses on interface ge-0/0/4.
Which queue does traffic with the IP precedence value of 100 use?
- A. expedited-forwarding
- B. network-control
- C. assured-forwarding
- D. best-effort
正解：A
質問 # 54
Which three statements are correct about EVPN route types? (Choose three.)
- A. Type 1 routes carry endpoint MAC address information.
- B. Type 3 routes carry replication information.
- C. Type 5 routes carry replication information.
- D. Type 2 routes carry endpoint MAC address information.
- E. Type 2 routes carry endpoint IP address information.
正解：A、D、E
質問 # 55
Referring to the exhibit, ServerA sends a single IP packet destined to 10.0.0.127.
Which two statements correctly describe the behavior of the resulting outbound VXLAN packets that contain the original packet destined to 10.0.0.127? (Choose two.)
- A. Router C will send a VXLAN packet destined only to router D and router E.
- B. Router E will replicate and send a copy of the received VXLAN packet to router D.
- C. Router C will send a single VXLAN packet to one remote VTEP.
- D. Router D will not replicate and send a copy of the received VXLAN packet to router E.
正解：B、C
質問 # 56
Which three MSTP parameters must match on all switches in the same MST region? (Choose three.)
- A. configuration name
- B. MSTI-to-VLAN mapping
- C. bridge priority
- D. forwarding delay
- E. revision number
正解：A、B、E
解説：
https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-configuring-mstp.html
質問 # 57
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