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Juniper JN0-649 Exam Sample Questions


Question # 1

Your network is multihomed to two ISPs. The BGP sessions are established; however, the ISP peers are not receiving any routes. Which two statements are correct about troubleshooting your configuration? (Choose two.)
A. Verify the import policies on your router.
B. Verify that the BGP routes are active in your routing table.
C. Verify the export policies on your router.
D. Verity that the multihop settings are configured on your router.


B. Verify that the BGP routes are active in your routing table.

C. Verify the export policies on your router.

Explanation:

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

Copy code

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

Copy code

show configuration policy-options policy-statement

show configuration protocols bgp group export

References:

Useful Juniper Commands.txt

Tech Ops Managed Router Juniper Install Guide





Question # 2

A Layer 2 connection does not expend across data centers. The IP subnet in a Layer 2 domain is confined within a single data center. Which EVPN route type is used to communicate prefixes between the data centers?

A. Type 1
B. Type 2
C. Type 4
D. Type 5


D. Type 5

Explanation:

Understanding EVPN Route Types:

EVPN routes facilitate Layer 2 and Layer 3 connectivity across data centers.

Layer 2 and Layer 3 Connectivity:

For Layer 3 connectivity across data centers, where Layer 2 does not extend, IP prefixes need to be communicated.

Type 5 Routes:

Type 5 (IP Prefix Route):

Used to distribute IP prefixes between data centers.

Ensures that Layer 3 connectivity is established without extending Layer 2 domains.

References:

Juniper EVPN Type 5 Routes

Configuring EVPN for Data Center Interconnect





Question # 3

Your enterprise network is running BGP VPNs to support multitenancy. Some of the devices with which you peer BGP do not support the VPN NLRI. You must ensure that you do not send BGP VPN routes to the remote peer. Which two configuration steps will satisfy this requirement? (Choose two.)
A. Configure an import policy on the remote peer to reject the routes when they are received.
B. Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.
C. Configure a route reflector for the VPN NLRI.
D. Configure the apply-vpn-export feature on the local BGP peer.


B. Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.

D. Configure the apply-vpn-export feature on the local BGP peer.

Explanation:

Step 1: Identify the problem.

Devices do not support VPN NLRI, and you must prevent these devices from receiving BGP VPN routes.

Step 2: Analyze the possible solutions.

Option A: Configure an import policy on the remote peer to reject the routes when they are received.

This approach would require configuration on the remote peer, which might not always be practical or possible.

Option B: Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.

This ensures the local BGP peer does not send the VPN routes to the remote peer, directly addressing the problem.

Option C: Configure a route reflector for the VPN NLRI.

This does not solve the issue of preventing the advertisement of VPN routes to non-supporting peers.

Option D: Configure the apply-vpn-export feature on the local BGP peer.

This feature ensures that the VPN export policies are applied, preventing the advertisement of VPN routes to peers that do not support VPN NLRI.

Step 3: Verify the configurations.

Option B and Option D directly address the requirement without needing configurations on the remote peer.

References:

Juniper BGP configuration guide on export policies.

Commands for applying export policies:

shell

Copy code

set policy-options policy-statement term from protocol bgp-vpn

set policy-options policy-statement term then reject

set protocols bgp group export

set protocols bgp apply-vpn-export





Question # 4

Which three MSTP parameters must match on all switches in the same MST region? (Choose three.)
A. forwarding delay
B. bridge priority
C. revision number
D. MSTI-to-VLAN mapping
E. configuration name


C. revision number
D. MSTI-to-VLAN mapping
E. configuration name
Explanation:

To ensure proper functioning within an MST (Multiple Spanning Tree) region, the following parameters must match across all switches:

Revision number:

The revision number identifies the version of the MST configuration. All switches within the same MST region must have the same revision number to ensure consistency.

MSTI-to-VLAN mapping:

The MSTI (Multiple Spanning Tree Instance) to VLAN mapping must be identical on all switches. This mapping ensures that each VLAN is assigned to the correct spanning tree instance.

Configuration name:

The configuration name (or region name) must be the same across all switches. This name uniquely identifies the MST region and must be consistent to ensure switches recognize they are part of the same region.

References:

The MSTP configuration requirements are detailed in Juniper network configuration guides and standards documents on MSTP.





Question # 5

BGP multipath or multihop are not configured in your network. In this scenario, what is the correct sequence for BGP active route selection?
A. higher local preference
shortest AS path
lowest peer address
lowest router ID
lower origin code
B. higher local preference
shortest AS path
lower origin code
lowest router ID
lowest peer address
C. higher local preference
lowest router ID
lowest peer address
lower origin code
shortest AS path
D. higher local preference
shortest AS path
lowest router ID
lowest peer address
lower origin code


B. higher local preference
shortest AS path
lower origin code
lowest router ID
lowest peer address

Explanation:

The correct sequence for BGP active route selection when BGP multipath or multihop are not configured is as follows:

Higher local preference: Routes with a higher local preference are preferred.

Shortest AS path: Routes with the shortest AS path are preferred.

Lower origin code: Routes with lower origin code (IGP < EGP < Incomplete) are preferred.

Lowest router ID: Routes with the lowest router ID are preferred.

Lowest peer address: Routes with the lowest peer address are preferred.

References:

Standard BGP route selection criteria as outlined in network routing protocols.

Documentation from "Useful Juniper Commands.txt" and "Juniper Commands.pdf" which include detailed BGP operational commands and preferences.




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