JN0-650最新試験情報 & JN0-650テスト資料

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Juniper JN0-650 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Layer 2 Authentication and Access Control: This domain examines network access control mechanisms including 802.1x, MAC RADIUS, captive portal, server fail fallback, guest VLANs, and multi-method authentication considerations.
トピック 2	IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP LLDP-MED protocols, and voice VLAN implementation.
トピック 3	Class of Service (CoS): This domain covers QoS mechanisms in Junos including CoS processing, header fields, forwarding classes, classification, policers, schedulers, drop profiles, shaping, and rewrite rules.
トピック 4	Interior Gateway Protocols (IGPs): This domain covers internal routing protocols operating within a single autonomous system, including OSPFv2, OSPFv3, and routing policy implementation, along with configuration, troubleshooting, and monitoring skills.
トピック 5	Ethernet Switching and Spanning Tree: This section covers advanced Layer 2 switching including filter-based VLANs, private VLANs, MVRP, Layer 2 tunneling via Q-in-Q and L2PT, plus MSTP and VSTP protocols.
トピック 6	EVPN: This section addresses Ethernet VPN technology for Layer 2 over Layer 3 connectivity, covering EVPN route types, VXLAN encapsulation, and multi-homing configurations.
トピック 7	IP Multicast: This domain addresses one-to-many communication using multicast routing, covering addressing, ASM vs SSM models, RPF, IGMP snooping, PIM sparse-mode, rendezvous points, Anycast RP, MSDP, and routing policies.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) 認定 JN0-650 試験問題 (Q78-Q83):

質問 # 78
You are enabling CoS throughout your enterprise network using the DSCP bits. You plan to use an MF classifier on all edge devices while using BA classifiers on all transit core devices In this scenario, what should you use to provide consistent handling of traffic?

A. You should implement rewrite rules on the core devices ' ingress interfaces to rewrite the DSCP bits as it enters the device.
B. You should implement rewrite rules on the edge devices ' egress interfaces to rewrite the DSCP bits as it leaves the device toward the core.
C. You should implement rewrite rules on the core devices ' egress interfaces to rewrite the DSCP bits as it leaves the device toward other core devices.
D. You should implement rewrite rules on the edge devices ' ingress interfaces to rewrite the DSCP bits as it enters the device.

正解：B

解説：
This scenario describes the standard transition of Class of Service (CoS) metadata from the network edge to the network core.
MF vs. BA Classification: Edge devices use Multifield (MF) classifiers because incoming traffic often lacks markings. MF classification assigns traffic to an internal forwarding class based on multiple fields (IPs, ports, etc.). Core devices use Behavior Aggregate (BA) classifiers because they are faster; they only look at the CoS bits (like DSCP) in the header to determine the forwarding class.
The Problem: Internal forwarding class assignments made by an MF classifier on the edge device do not automatically travel with the packet. If the packet leaves the edge device with its original (potentially zeroed) DSCP bits, the core device ' s BA classifier will not be able to identify the priority.
The Solution (Option A): You must implement rewrite rules on the egress interfaces of the edge devices. A rewrite rule takes the internal forwarding class and loss priority assigned by the MF classifier and " writes " the corresponding DSCP value into the packet header as it exits toward the core. This ensures that the core device sees the correct DSCP marking and can apply the appropriate BA classification.
Incorrect Options: Rewrite rules are strictly an egress function to modify the packet for the next hop.
Applying them on ingress (Option B) or core ingress (Option C) does not solve the problem of ensuring the packet header reflects the classification logic used during the internal switching process of the edge device.

質問 # 79
Your Layer 2 network uses 802.1X to authenticate user devices connecting to the network. You are asked to include a new Layer 2 interface connection from the conference room in your network. You must ensure that only a single device is allowed to authenticate on this port at one time to avoid users from being able to plug in a rogue switch to this port. In this scenario, which
802.1X method would you use for the new interface?

A. multiple supplicant mode
B. single-secure supplicant mode
C. single supplicant mode
D. MAC-RADIUS

正解：B

解説：
Single-secure supplicant mode allows only one device to authenticate on the port at a time. This prevents a rogue device, such as a switch, from being connected behind the port, while still allowing legitimate users to authenticate via 802.1X.

質問 # 80
You are securing the network using 802.1x access control. You apply 802.1x authentication on the distribution switch, as shown in the exhibit. You configure the switch port in single supplicant mode.

What will the result be?

A. A secure connection will be established for connections through the distribution switch without RADIUS authentication.
B. Only the first device to connect through the distribution switch will be allowed to authenticate and access the network.
C. Only the first device to connect through the distribution switch will be authenticated; other devices will have access without authentication.
D. Every device that connects through the distribution switch will be required to enter authentication credentials.

正解：C

質問 # 81
What information is contained in an OSPF LSA header? (Choose two.)

A. options
B. subnet mask
C. protocol
D. length

正解：A、D

質問 # 82
Your network has Junos Fusion configured with MX960 routers as aggregation devices (AD) and QFX5100 switches as satellite devices (SD).
Which two statements are correct in this scenario? (Choose two.)

A. The Fusion extended ports are configured on the SDs.
B. All SDs connected to a single AD must use the same software version.
C. The AD runs the Junos software for all its connected SDs.
D. SDs are added to the AD by configuring the cascade port on the AD.

正解：A、D

質問 # 83
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