H12-261-ENU 試験問題を無料オンラインアクセス

Two routers are connected through the serial port, but the interconnection interface cannot be pinged. Now check the port status as follows, which is the possible reason? (No figure is shown, one PPP, and one HDLC, you can find the reason.)

• A.The IP address is not on the same network segment.
• B.Link layer protocol is inconsistent
• C.Subnet mask does not match
• D.Link bandwidth is not enough

In the packet forwarding by the way of inter-AS VPN-Option B, the two ASBRs exchange the LSP labels of the public network.

• A.False
• B.True

Regarding the processing mode of MPLS for TTL, which of the following description is correct?

• A.In MPLS VPN, if you want to hide the structure of the MPLS backbone network, you can use the uniform mode in Ingress for private network packets.
• B.In the Pipe mode, when an IP packet passes through the MPLS network, the IP TTL is decremented by 1 to the MPLS TTL field in the ingress node.
• C.The TTL of the MPLS label has the same meaning as the TTL in the IP header, which can prevent the MPLS network from generating a routing loop (according to the reason A)
• D.Uniform simulation, when the IP packet passes through the MPLS network, the IP TTL of the ingress node is decremented by 1, and the MPLS TTL field is a fixed value.

Which of the following description is wrong about the VPNv4 address?

• A.Before the local PE advertises the VPNv4 route learned from the site directly connected to itself to other PEs, it sets the Target attribute for these routes and advertises it as a BGP extended community attribute along with the route.
• B.The VPNv4 address has a total of 12 bytes, including an 8-word route identifier RD (Route Distinguisher) and a 4-byte IPv4 address prefix.
• C.When BGP advertises reachable and unreachable VPNv4 routes, it carries the RD attribute.
• D.By default, the PE does not perform vpn-target filtering on the received VPNv4 routes.

If the PM-SM protocol is run on the multicast network, you need to configure the RP. The configuration of the RP is classified into dynamic RP and static RP. The following which is the correct description of the RP configuration?

• A.When configuring dynamic RP, you need to configure the BSR as the backup of the RP.
• B.You do not need to configure BSR when configuring dynamic RP.
• C.When configure static RP, you need to configure the BSR advertisement RP information.
• D.When configuring static BP, you need to specify the RP information on all PIM routers.