642-885 試験問題を無料オンラインアクセス

Which statement is correct regarding using the TTL threshold to define the delivery boundaries of multicast traffic?

• A.If a packet TTL is less than the specified TTL threshold, the packet is forwarded out of the interface
• B.If a packet TTL is equal to the specified TTL threshold, the packet is dropped
• C.If a packet TTL is greater or equal to the specified TTL threshold, the packet is forwarded out of the interface
• D.When a multicast packet arrives, the TTL threshold value is decremented by 1. If the resulting TTL threshold value is greater than or equal to 0, the packet is dropped

Which two statements regarding the BGP peerlngs are correct? (Choose two)

• A.PE5 has received a total of 60 prefixes from its neighbors
• B.On PE5, the "pass" outbound route policy is applied to the 192.168.105.51 EBGP peer
• 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

Refer to the topology diagram shown in the exhibit and the partial configurations shown below.

Once the attack from 209.165.201.144/28 to 209.165.202.128/28 has been detected, which additional configurations are required on the P1 IOS-XR router to implement source-based remote-triggered black hole filtering?
! router bgp 123 address-family ipv4 unicast redistribute static route-policy test
!

• A.router static address-family ipv4 unicast 209.165.201.144/28 null0 tag 666 192.0.2.1/32 null0 tag 667 ! route-policy test if tag is 666 then set next-hop 192.0.2.1 endif if tag is 667 then set community (no-export) endif end-policy !
• B.router static address-family ipv4 unicast 209.165.202.128/28 null0 tag 666 192.0.2.1/32 null0 ! route-policy test if tag is 666 then set next-hop 192.0.2.1 set community (no-export) endif end-policy !
• C.router static address-family ipv4 unicast 209.165.201.144/28 null0 tag 666 192.0.2.1/32 null0 ! route-policy test if tag is 666 then set next-hop 192.0.2.1 set community (no-export) endif end-policy
• D.router static address-family ipv4 unicast 209.165.202.128/28 null0 tag 666 192.0.2.1/32 null0 tag 667 ! route-policy test if tag is 666 then set next-hop 192.0.2.1 endif if tag is 667 then set community (no-export) endif end-policy !

Which of the following can be used by dual-stack service providers supporting IPv4/IPv6 customers with dual-stack hosts using public IPv6 addresses and private IPv4 addresses?

• A.6RD
• B.Carrier-grade NAT
• C.6to4 tunnels
• D.NAT64

When configuring PIM operations, what is the effect of setting the SPT threshold to infinity?

• A.The receivers will be able to immediately switch over to the shortest path tree after receiving the first multicast packets on the shared tree via the RP
• B.The last-hop routers will never switch over to the shortest path tree and will always remain on the shared tree
• C.The multicast source to the RP path will never switch over to the shortest path tree
• D.All the PIM routers will have more (S,G) states, thus consuming more router resources