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EVN & VRF Questions 2

July 21st, 2017 in ROUTE 300-101 Go to comments

Question 1


Route replication allows shared services because routes are replicated between virtual networks and clients who reside in one virtual network can reach prefixes that exist in another virtual network.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/evn/configuration/xe-3s/evn-xe-3s-book/evn-shared-svcs.html

Question 2

Question 3


Path isolation can be achieved by using a unique tag for each Virtual Network (VN) -> Answer A is correct.

Instead of adding a new field to carry the VNET tag in a packet, the VLAN ID field in 802.1q is repurposed to carry a VNET tag. The VNET tag uses the same position in the packet as a VLAN ID. On a trunk interface, the packet gets re-encapsulated with a VNET tag. Untagged packets carrying the VLAN ID are not EVN packets and could be transported over the same trunk interfaces -> Answer E is correct.

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/layer-3-vpns-l3vpn/whitepaper_c11-638769.html

Question 4


We are trying to ping the in vrf Yellow but the Serial0/0 interfaces of both routers do not belong to this VRF so the ping fails. We need to configure S0/0 interfaces with the “ip vrf forwarding Yellow” (under interface S0/0) in order to put these interfaces into VRF Yellow.

Question 5

Question 6

Question 7


In the link http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/25ew/configuration/guide/conf/vrf.html there is a notice about route-target command: “Note: This command is effective only if BGP is running.” -> C is correct.

Answer A & F are not correct as only route distinguisher (RD) identifies the customer routing table and “allows customers to be assigned overlapping addresses”.

Answer E is not correct as “When BGP is configured, route targets are transmitted as BGP extended communities”

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