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Juniper JN0-650 Prüfungsplan:

Thema	Einzelheiten
Thema 1	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.
Thema 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.
Thema 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.
Thema 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.
Thema 5	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) JN0-650 Prüfungsfragen mit Lösungen (Q60-Q65):

60. Frage
You have configured DSCP CoS in your network and have applied BA and multifield classifiers to all interfaces.
In this scenario, which statement is correct?

A. If traffic matches both classifiers, then the multifield classifier determines into which forwarding class the traffic is assigned
B. You must set the BA classifier to take precedence over the multifield classifier or the configuration is ignored
C. If traffic matches both classifiers, then the BA classifier determines into which forwarding class the traffic is assigned.
D. You must set the multifield classifier to take precedence over the BA classifier or the configuration is ignored.

Antwort: A

Begründung:
In Junos OS Class of Service (CoS) processing, there is a specific order of operation for packet classification.
* Precedence of Multifield (MF) Classifiers:When both a Behavior Aggregate (BA) classifier and a Multifield (MF) classifier are applied to an interface, theMF classifier takes precedence.
* Processing Order:
* The BA classifier (e.g., DSCP or 802.1p) inspects the packet header and assigns an initial forwarding class and loss priority.
* The MF classifier (which looks at multiple fields like source/destination IP and port) is processed later in the pipeline.
* The "Final Word":Because the MF classifier is evaluated later, its resultsoverwriteany previous assignments made by the BA classifier. Therefore, if a packet matches both, the MF classifier determines the final forwarding class assignment.

61. Frage
Exhibit.

Referring to the exhibit, you see that the 0.0.0.0/0 route is coming from AS 64512.
What is the command to achieve this task?

A. show route receive-protocol bgp < peer ip > hidden
B. show route receive-protocol bgp < peer ip >
C. show route protocol bgp next-hop < peer ip >
D. show route protocol bgp source-gateway < peer ip >

Antwort: A

Begründung:
The exhibit shows a BGP routing process where an Import Policy is being applied to routes received in the RIB-IN. Specifically, Policy 1 states: " Reject 0.0.0.0/0 from AS 64512. " In Junos OS, when a routing policy rejects a route, that route is not placed in the main routing table (inet.0) for active use. Instead, it becomes a hidden route. To verify that a specific peer is actually sending a route that is subsequently being rejected by your policy, you must use specific diagnostic commands:
Understanding " Hidden " Routes: When a BGP route is received but fails to meet policy requirements (or has an unreachable next-hop), Junos keeps it in the BGP RIB-IN but marks it as " hidden. " It will not appear in a standard show route command.
Command Logic (Option D): The command show route receive-protocol bgp < peer ip > hidden allows an administrator to view all routes received from a specific neighbor, including those that were rejected by import policies.
show route receive-protocol bgp < peer ip > : Shows only the routes that passed the import policy and were accepted into the table. Since the 0.0.0.0/0 route from AS 64512 is explicitly rejected in the exhibit, it would not show up here.
Adding the hidden keyword is the essential step to see the rejected default route and verify that AS 64512 is indeed sending it before the policy drops it.
Other Options:
Option A is incorrect because it only shows accepted routes.
Option B and C are used to filter the existing active routing table based on gateway or next-hop attributes, but they cannot show routes that have been rejected and excluded from that table.

62. Frage
When configuring Q-in-Q tunneling, which type of tunneling involves the swapping of S-VLANs with C- VLANs?

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

Antwort: B

Begründung:
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.

63. Frage
Which statement accurately describes class-of-service (CoS) policers on EX Series switches?

A. Policing uses a token bucket algorithm to enforce bandwidth limits.
B. Policing is used for rewriting rules based on bandwidth usage.
C. Policing discards packets that exceed the configured rate, with no other configurable actions.
D. Policers buffer excess traffic to ensure delivery, disregarding configured limits.

Antwort: A

Begründung:
CoS policers on EX Series switches use a token bucket algorithm to measure traffic rates and enforce configured bandwidth limits by determining whether packets conform to the allowed rate profile.

64. Frage
Click the Exhibit button.

Referring to the exhibit, R2 receives a packet from the multicast source on its ge-0/0/4.0 interface.
Which two statements are correct in this scenario? (Choose two.)

A. All interfaces other than ge-0/0/4.0 will be on the outgoing interface list.
B. The packet is discarded.
C. R2 determines that the packet is coming in on an interface that is on the reverse path back to the source.
D. R2 verifies the existing unicast routing table and determines that this interface is not on the reverse path back to the source.

Antwort: B,D

Begründung:
R2 uses RPF (Reverse Path Forwarding) checks to verify that multicast packets arrive on the interface that is on the shortest path back to the source. Since the packet arrives on ge-0/0/4.0, which is not the RPF interface toward 192.168.100.10 (the correct RPF interface is ge-0/0/1.0 toward 172.18.1.1), the packet fails the RPF check and is discarded to prevent loops.

65. Frage
......

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