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EVN & VRF Questions 2

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

Question 1

Explanation

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

Explanation

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

Explanation

We are trying to ping the 192.168.1.2 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

Explanation

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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