Exam 300-420 topic 1 question 114 discussion

Actual exam question from Cisco's 300-420

Question #: 114
Topic #: 1

An ISP provides Layer 3 VPN service over MPLS to a customer with four branches and multiple CE routers at each branch. To exchange the routes that are learned from the CE routers, which BGP address family should the ISP activate among the PE routers?

A. address-family multicast
B. L2VPN EVPN
C. VPNv4 unicast
D. IPv4 unicast

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Suggested Answer: C 🗳️

by Reinier_veen at Nov. 4, 2022, 1:52 p.m.

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SpicyMochi

7 months, 3 weeks ago

Selected Answer: C

C. VPNv4 unicast To exchange routes learned from CE routers in a Layer 3 MPLS VPN service, the ISP should activate the VPNv4 unicast address family among the PE routers. VPNv4 unicast is the BGP address family used in MPLS VPN networks to exchange routing information between the PE routers. It carries the VPNv4 prefix, which includes both the customer IPv4 prefix and the route distinguisher (RD) value that identifies the VPN instance.

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Reinier_veen

1 year, 1 month ago

Selected Answer: C

http://www.mplsvpn.info/2009/11/difference-between-address-family-ipv4.html " In short we can say that ipv4 address-family is being used for customers and vpnv4 address-family is used by SP core. "

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