Exam 300-420 topic 1 question 201 discussion

Actual exam question from Cisco's 300-420

Question #: 201
Topic #: 1

Refer to the exhibit. An architect must design a solution to connect bank site A with bank site B and support:
• network operation center monitoring end-to-end L3VPN and L2VPN traffic
• company adding thousands of routes in the next two years

Which two BGP solutions must the design include? (Choose two.)

A. Establish full mesh IBGP peering with all routers in different IGP domains.
B. Redistribute different IGP domain routes in a BGP IPv4 routing instance.
C. Connect multiple IGP/LDP domains using a BGP IPv4 unicast family on the ABR.
D. Apply BGP policies on all routers to filter out ABR and PE loopback IP addresses.
E. Transport site routes using a BGP VPNv4 address family on the PE routers.

Show Suggested Answer

Suggested Answer: CE 🗳️

by cerifyme85 at April 18, 2023, 12:13 p.m.

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SpicyMochi

Highly Voted 7 months, 4 weeks ago

Selected Answer: CE

C & E C. Connect multiple IGP/LDP domains using a BGP IPv4 unicast family on the ABR - This is a suitable solution as it enables connecting different IGP domains at the ABR (Area Border Router) level using BGP for inter-domain routing. This provides a scalable solution for managing the growing number of routes and interconnecting bank sites A and B. E. Transport site routes using a BGP VPNv4 address family on the PE routers - This is a suitable solution as it enables transporting both L3VPN and L2VPN traffic using the BGP VPNv4 address family on the Provider Edge (PE) routers. This provides the necessary support for end-to-end traffic monitoring and scalability as the company adds thousands of routes in the future.

upvoted 5 times

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cerifyme85

Most Recent 8 months, 1 week ago

Selected Answer: CD

According to this document C and D This one is a beast to lab... not worth it. Will try it out when I have the time.. but docs are pretty clear. C https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/16-12/configuration_guide/mpls/b_1612_mpls_9600_cg/configuring_seamless_mpls.html#id_112315:~:text=for%20Seamless%20MPLS-,Overview%20of%20Seamless%20MPLS,Architecture%20for%20Seamless%20MPLS,-The%20figure%20shows D https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/16-12/configuration_guide/mpls/b_1612_mpls_9600_cg/configuring_seamless_mpls.html#id_112315:~:text=Step%C2%A025-,exit,(Requires,-a%20Cisco%20Service Thoughts anyone?

upvoted 1 times

cerifyme85

8 months ago

D (correct link below): https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/16-12/configuration_guide/mpls/b_1612_mpls_9600_cg/configuring_seamless_mpls.html#id_112315:~:text=Step%C2%A025-,exit,destination%20IP%20network%20number%20address%20that%20is%20permitted%20by%20a%20prefix,-list.

upvoted 1 times

dgonzalezexamtopics

8 months ago

For me C was correct. With what u say about D, u've convinced me. So C & D.

upvoted 1 times

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SpicyMochi

7 months, 4 weeks ago

D. Apply BGP policies on all routers to filter out ABR and PE loopback IP addresses - While filtering routes is important, this option alone does not provide a complete solution for the given requirements, and it does not address the end-to-end L3VPN and L2VPN traffic monitoring and scalability issues. I believe C & E are still correct: Reasoning for E: E. Transport site routes using a BGP VPNv4 address family on the PE routers - This is a suitable solution as it enables transporting both L3VPN and L2VPN traffic using the BGP VPNv4 address family on the Provider Edge (PE) routers. This provides the necessary support for end-to-end traffic monitoring and scalability as the company adds thousands of routes in the future.

upvoted 2 times

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