Juniper Exam JN0-664 Topic 9 Question 31 Discussion

In the context of Layer 3 VPNs (L3VPN) using MPLS, the routing information for different customers (VPNs) is typically stored in separate routing tables (VRFs). When you want to verify that PE2 is receiving the VPN routes for Customer C from PE1, you need to check the appropriate VRF routing table on PE2.

1. **Option A: show route table customer-c.inet.0**

- This command displays the routing table specific to Customer C's VRF.

- Since we want to verify that PE2 has received the VPN routes for Customer C, this is the most appropriate command to use.

- It allows us to see all routes learned for Customer C's VPN.

2. **Option B: show route table bgp.l3vpn.0**

- This command displays the BGP routing table for all L3VPN routes.

- While this includes routes for Customer C, it also includes routes for all other VPNs, making it harder to isolate the specific information for Customer C.

- This command is more useful for an overall view of BGP L3VPN routes rather than for a specific customer's VRF.

3. **Option C: show route summary**

- This command provides a summary of the routes in all routing tables.

- It doesn't give detailed information about the specific routes for Customer C's VRF.

- It's useful for a high-level overview but not for verifying specific customer routes.

4. **Option D: show route table inet.0**

- This command shows the global routing table, not the VRF-specific tables.

- The global routing table doesn't contain the VPN-specific routes that are stored in the VRF tables.

- Therefore, it won't help in verifying the routes for Customer C.

**Conclusion**:

To verify that PE2 is receiving VPN routes for Customer C from PE1, the most appropriate command is to check the specific VRF routing table for Customer C. Hence, the correct answer is:

**A. show route table customer-c.inet.0**

**Reference**:

- Junos OS documentation on MPLS VPNs: [Junos MPLS VPNs Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/mpls-vpns.html)

- Command Reference for Routing Tables: [Junos OS Routing Tables Command Reference](https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/show-route-table.html)