Juniper JN0-649 Practice Test Questions Answers

To understand what routes the BGP neighbor can and cannot advertise, we need to analyze the output provided in the exhibit. Here are the key points from the BGP neighbor configuration:

Address Families Configured:

The neighbor has the EVPN (Ethernet VPN) address family configured.

There is no indication of L3 VPN (Layer 3 Virtual Private Network) address family configuration in the provided output.

Advertised NLRI (Network Layer Reachability Information):

The output shows that the BGP neighbor advertises EVPN NLRI and does not have configurations to advertise L3 VPN NLRI.

Session Details:

The BGP session is established and in sync with the EVPN address family.

Based on these observations, the correct statements about the BGP neighbor's capabilities are:

C. The BGP neighbor can advertise EVPN related routes.

The exhibit confirms that the EVPN address family is configured and EVPN NLRI is advertised.

D. The BGP neighbor cannot advertise L3 VPN related routes.

There is no configuration or NLRI for L3 VPN in the exhibit, indicating that L3 VPN routes cannot be advertised by this neighbor.

References:

Useful Juniper Commands.txt

Tech Ops Managed Router Juniper Install Guide

In summary, the BGP neighbor in the exhibit can advertise EVPN routes but cannot advertise L3 VPN routes based on the provided configuration and session details.

To troubleshoot why ISP peers are not receiving any routes in a multihomed BGP setup, the following steps are essential:

Verify Active BGP Routes: Ensure that the BGP routes are active in the routing table. Only active routes can be advertised to BGP peers.

shell

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show route protocol bgp

Verify Export Policies: Check the export policies configured on your router. The export policies determine which routes are advertised to BGP peers. If these policies are incorrectly configured or missing, routes will not be advertised.

shell

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show configuration policy-options policy-statement

show configuration protocols bgp group export

References:

Useful Juniper Commands.txt

Tech Ops Managed Router Juniper Install Guide

In a PIM-SM (Protocol Independent Multicast - Sparse Mode) network setup:

Before the formation of the rendezvous-point tree, a join message is sent from R1 to R3 (RP):

R1, being the router connected to the receiver, sends a PIM join message towards the RP (R3) to join the multicast group.

Before the formation of the rendezvous-point tree, an IGMP is sent from the Receiver to R1:

The receiver sends an IGMP membership report to its directly connected router (R1), indicating its interest in joining a multicast group.

References:

The behavior of PIM-SM and the process of join messages and IGMP reports are covered in multicast networking sections of network configuration and design guides​​​​.

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​​​​.