642-885 無料問題集「Cisco Deploying Cisco Service Provider Advanced Network Routing」

（A）RP discovery messages are flooded hop by hop throughout the network as multicast to the all PIM routers multicast group with a TTL of 1

（B）Candidate RPs learn the IP address of the mapping agents via periodic RP discovery messages

（C）Administrative scoping can be configured to limit the scope of the RP announcements

（D）Every PIM-SM router must be configured with the RP mapping agent IP address

（E）Candidate RPs send RP announcements to the 224.0.1.39 multicast group, and the mapping agents send RP discovery messages to the 224.0.1.40 multicast group

（F）A Reverse Path Forwarding check is done on the RP discovery messages

（A）Verify that the ibgp-multihop command under the BGP neighbor is configured correctly on each router

（B）Verify that the ttl-security command under the BGP neighbor is configured correctly on each router to enable the router to send the BGP packets using a proper TTL value

（C）Verify that the update-source loopback command under the BGP neighbor is configured correctly on each router

（D）Verify that the loopback interfaces are reachable over the IGP

（E）Verify that the network command under router BGP is configured correct on each router for announcing the router's loopback interface in BGP

（F）Verify that the UDP port 179 traffic is not being blocked by an ACL or firewall between the two IBGP peers

（A）To enable the router as the candidate RP

（B）To enable the router as the BSR mapping agent

（C）To set up an administrative boundary to prevent BSR messages from being sent out through an interface

（D）To enable the router as the candidate BSR

（E）To define a boundary to restrict the RP discovery and announcement messages from being sent outside the PIM-SM domain

（A）On PE5, the "pass" outbound route policy is applied to the 192.168.105.51 EBGP peer

（B）PE5 has received a total of 60 prefixes from its neighbors

（C）On PE5,the incoming prefixes received from the 192.168.105.51 EBGP peer is limited to a maximum of 10 prefixes

（D）PE5 has one EBGP peer (CE5) and two IBGP peers (P1 and PE6)

（E）On PE5, the "rplin" inbound route policy is applied to the 192.168.105.51 EBGP peer

（A）Configure the route-map in command on the CE BGP neighbor.

（B）Configure site-map on VRF interface and redistribution of iBGP.

（C）Configure Site of Origin directly on the CE BGP neighbor command.

（D）Configure the route-map out command on the P router.

（E）Configure site-map on VRF interface and network command.

（A）On Cisco IOS, IOS-XE, and IOS-XR, the router can be configured to cache the SA messages to reduce the join latency

（B）SA messages are flooded to all other MSDP peers without any restrictions

（C）SA messages are used to advertise active sources in a domain

（D）MSDP establishes neighbor relationships with other MSDP peers using TCP port 639

（E）The MSDP peers are also typically the RPs in respective routing domains.

（F）MSDP peerings on Cisco IOS, IOS-XE, and IOS-XR support MD5 or SHA1 authentication

（A）The ASBRcan have many working customer VRFs, so this configuration ensures the coexistence of all the route-target extended communities that belong to the all ASBR-terminated customer VRFs.

（B）When implementing the Inter-AS Option B MPLS VPN solution, all the route targets that are transmitted over the Inter-AS links need an ASBR local database to forward the customer traffic correctly.

（C）In the Inter-AS Option B design, no local VRF is maintained on the ASBR routers,so the default behavior of the operating system is to deny any route-target extended community that is encoded in the incoming iBGP updates. This configuration permits VPNv4 communication by accepting the iBGP updates even if no route targets are configured locally.

（D）The Inter-AS Option B design implements VPNv4 communication over the Inter-AS link, hence the requirement for a route-target association for each customer VPN connected across two or more ASs.