300-440 Question 166
Select 3An enterprise customer has multiple branch offices connected via a service provider MPLS Layer 3 VPN. The customer requires that traffic between branches is isolated from other customers using the same service provider network, while still allowing each branch to communicate directly with other branches. Which two characteristics of MPLS Layer 3 VPNs support this requirement?
- A
Each customer's routing information is stored in a separate Virtual Routing and Forwarding (VRF) table.
- B
The service provider uses MPLS labels to segregate traffic between different customers.
- C
The customer must use the same IP addressing scheme as the service provider.
- D
BGP is used to exchange VPN routing information between the provider edge (PE) routers.
- E
Traffic between customer branches is encrypted using IPSec tunnels by default.
Show answer and explanation
Correct answers: A, B, D
Explanation
MPLS Layer 3 VPNs enable the service provider to isolate customer traffic by using VRF tables and MPLS labels, ensuring that traffic from one customer does not interfere with another. BGP is utilized to exchange routing information between PE routers, facilitating branch-to-branch communication. These mechanisms fulfill the requirements of traffic isolation and inter-branch communication without requiring the use of IPSec or IP scheme integration with the service provider.
- A. Correct.
Correct: VRF tables ensure routing information is isolated for each customer, providing traffic segregation.
- B. Correct.
Correct: MPLS labels are used by the service provider to segregate and forward traffic uniquely for each customer.
- C. Incorrect.
Incorrect: MPLS Layer 3 VPNs do not require customers to use the same IP addressing scheme as the service provider. Customers can maintain their own addressing.
- D. Correct.
Correct: BGP is used to exchange VPN routing information between PE routers, ensuring that branch offices can communicate.
- E. Incorrect.
Incorrect: MPLS Layer 3 VPNs do not rely on IPSec for traffic encryption by default. Traffic isolation is achieved using MPLS labels and VRFs.