Which command would you use to verify the presence of VPN routes on a PE device?
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A. B. C. D.A
The command that can be used to verify the presence of VPN routes on a PE (Provider Edge) device depends on the VPN technology that is being used. However, based on the given options, the command that would be appropriate to verify VPN routes on a PE device is the "show route table bgp.l3vpn.0" command, which is option A.
Here's a detailed explanation of why option A is the correct command to verify VPN routes on a PE device:
Option A: "show route table bgp.l3vpn.0" The "show route table bgp.l3vpn.0" command displays the routes that have been learned via BGP-based VPNs. The "bgp.l3vpn.0" routing table is used to store VPN routes learned through BGP-based VPNs. This command displays the routes in this table, which include all the VPN routes that have been advertised and received by the PE device. The output of this command shows the destination network, the next hop IP address, the protocol used to learn the route (BGP), and the VPN route target that the route belongs to. This command is useful in verifying whether the PE device has learned the VPN routes that it is supposed to learn and whether the routes have been correctly propagated within the VPN.
Option B: "show route protocol bgp terse | count" The "show route protocol bgp terse | count" command displays the number of BGP routes that have been learned by the PE device. This command does not specifically display VPN routes, but rather all BGP routes that have been learned. The "terse" option displays a summary of the routes, and the "count" option displays the number of routes that match the search criteria. This command can be useful in verifying the overall BGP route count on the PE device, but it does not provide information specifically about VPN routes.
Option C: "show route table inet.0" The "show route table inet.0" command displays the IPv4 routes that have been learned by the PE device. This command does not specifically display VPN routes, but rather all IPv4 routes that have been learned. The "inet.0" routing table is used to store IPv4 routes learned by the PE device. This command can be useful in verifying the overall IPv4 route count on the PE device, but it does not provide information specifically about VPN routes.
Option D: "show route route-type vpn" The "show route route-type vpn" command displays the VPN routes that have been learned by the PE device. However, this command is not a valid Junos OS command. The correct command to display VPN routes on a Juniper device is "show route table bgp.l3vpn.0".
In summary, the correct command to verify the presence of VPN routes on a PE device is option A: "show route table bgp.l3vpn.0". This command displays the routes that have been learned via BGP-based VPNs and provides detailed information about the VPN routes, including the destination network, the next hop IP address, the protocol used to learn the route (BGP), and the VPN route target that the route belongs to.