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Juniper JN0-650 考試大綱：

主題	簡介
主題 1	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.
主題 2	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.
主題 3	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.
主題 4	BGP: This section focuses on Border Gateway Protocol operations including route selection, next hop resolution, BGP attributes, communities, load balancing, IPv4 IPv6 address families, advanced options, and routing policy implementation.
主題 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.
主題 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.

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最新的 JNCIS-ENT JN0-650 免費考試真題 (Q77-Q82):

問題 #77
You want to validate a recursive lookup for an EVPN route designation. Which route table query will accomplish this task?

A. vxlan.inet.0
B. inet.3
C. inet.2
D. default-switch.evpn.0

答案：D

解題說明：
To validate a recursive lookup for an EVPN route, you query the default-switch.evpn.0 table. This table contains the MAC/IP bindings and next-hop information for EVPN routes, which the switch uses to resolve the recursive path for forwarding.

問題 #78
Exhibit
As shown in the exhibit, you have implemented CoS classifiers using Differentiated Services Code Point (DSCP) In this scenario, which two statements are correct? (Choose two.)

A. This custom DSCP classifier must be associated with logical interfaces.
B. The default classification assignment overwrites all specified classifications
C. The configuration imports all default classification assignments that are not specified.
D. This custom DSCP classifier must be associated with physical interfaces.

答案：A,C

問題 #79
When implementing BGP routing policy, which Junos policy-statement term action can be used to reject a route?

A. accept
B. reject
C. next term
D. next policy

答案：B

問題 #80
You have multiple BGP routes to the same prefix with equal local-preference values and AS-path lengths.
In this scenario, which route will be preferred in the route selection process?

A. The route with the most preferred origin value.
B. The route with the highest MED value.
C. The route with the least preferred origin value.
D. The route with the lowest MED value.

答案：A

問題 #81
When configuring Q-in-Q tunneling, which type of tunneling involves the swapping of S-VLANs with C- VLANs?

A. many-to-many
B. L2PT
C. VLAN rewrites
D. all-in-one

答案：C

解題說明：
In a Juniper Q-in-Q (Layer 2 tunneling) environment, VLAN rewrites (specifically the swap operation) provide the most granular control over how customer traffic (C-VLANs) is mapped to service provider traffic (S-VLANs).
* VLAN Rewrites (The Swap Operation): This method involves replacing the incoming customer VLAN tag with a service provider tag as the frame enters the tunnel. This is technically a " swap " because the original C-VLAN tag is removed and the S-VLAN tag is written in its place. At the egress of the tunnel, the S-VLAN tag is swapped back for the original C-VLAN tag. This is often used when different customers use the same C-VLAN IDs and the provider needs to keep them unique within their core.
* Many-to-Many: This is a mapping style where multiple customer VLANs are mapped to multiple service provider VLANs, but it typically relies on the " push " (stacking) operation rather than a literal " swap " of the tag itself.
* All-in-One: This is the simplest form of Q-in-Q where all traffic entering an interface is " pushed " into a single S-VLAN tag, regardless of any existing C-VLAN tags. No swapping occurs; the original tags are simply buried under the new provider tag.
* L2PT (Layer 2 Protocol Tunneling): This is a feature used to tunnel Layer 2 control protocols (like STP, CDP, or LLDP) across a provider network by encapsulating them or changing their destination MAC addresses. It does not involve the swapping of VLAN tags.

問題 #82
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