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Question 1

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Exhibit Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Si

Question 2

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Exhibit You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

Question 3

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Which two statements are correct about a sham link? (Choose two.)

Question 4

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Exhibit R1 and R8 are not receiving each other's routes Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)

Question 5

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You are a network architect for a service provider and want to offer Layer 2 services to your customers You want to use EVPN for Layer 2 services in your existing MPLS network. Which two statements

Question 6

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After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot. Which th

Question 7

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Exhibit You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP You have already configured mpis ipv6-tunneling on yo

Question 8

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You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers. Which action accomplishes this task?

Question 9

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Your organization manages a Layer 3 VPN for multiple customers To support advanced route than one BGP community on advertised VPN routes to remote PE routers. Which routing-instance configuration p

Question 10

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Exhibit A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working. Which three configuration changes will create a summary route? (Cho

Question 83 - JN0-664 discussion

Refer to the exhibit.

Click the Exhibit button.

You have an EVI implemented between PE-1, PE-2, and PE-3 to allow communication between CE-1 and CE-2. CE-2 receives unicast traffic from CE-1 on both links to PE-2 and

PE-3. When CE-1 sends broadcast traffic, CE-2 receives it on only one of the multihomed links.

Referring to the exhibit, which EVPN route type enables this behavior?

Type 4

Type 3

Type 1

Type 2

Suggested answer: B

Explanation:

In the context of Ethernet VPN (EVPN) and the behavior described in the exhibit, it's essential to understand the different EVPN route types and their specific functionalities. Here, CE-2 is receiving unicast traffic on both of its multihomed links to PE-2 and PE-3, but broadcast traffic is received only on one of these links.

**Explanation of EVPN Route Types**:

1. **Type 1 (Ethernet Auto-Discovery Routes)**:

- These routes are used for auto-discovery of Ethernet segments and for advertising VLAN membership.

- They do not directly influence the behavior described in the question.

2. **Type 2 (MAC/IP Advertisement Routes)**:

- These routes are used to advertise MAC addresses and IP-to-MAC bindings within the EVPN.

- They handle unicast traffic forwarding and are crucial for populating the MAC address tables on the PE devices.

- While important, they do not explain the selective broadcast behavior.

3. **Type 3 (Inclusive Multicast Ethernet Tag Routes)**:

- These routes are used to build multicast distribution trees for delivering broadcast, unknown unicast, and multicast (BUM) traffic.

- They ensure that BUM traffic is sent only once per Ethernet segment, preventing duplicate frames from being sent to multihomed CEs.

- This aligns with the behavior described where CE-2 receives broadcast traffic on only one link to prevent duplication.

4. **Type 4 (Ethernet Segment Routes)**:

- These routes are used to advertise the presence of an Ethernet segment and are crucial for Designated Forwarder (DF) election processes in multihoming scenarios.

- While relevant to multihoming, they are not directly responsible for the selective broadcast behavior.

**Conclusion**:

The behavior described, where CE-2 receives broadcast traffic on only one of its multihomed links, is controlled by Type 3 routes. These routes are specifically designed to handle inclusive multicast and broadcast traffic efficiently in EVPN environments, ensuring that such traffic is not duplicated across multiple links to the same CE.

**Reference**:

- Juniper Networks EVPN Documentation: [EVPN Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-overview.html)

- RFC 7432, BGP MPLS-Based Ethernet VPN: [RFC 7432](https://tools.ietf.org/html/rfc7432) provides detailed descriptions of EVPN route types and their functions.

- Junos OS EVPN Configuration Guide: [Junos OS EVPN Configuration Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/evpn.html)

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asked 18/09/2024

Benvindo Almeida

41 questions

Your answer: A B C D

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