Cisco 642-885 Actual Free Exam Questions & Community Discussion

Exam Code/Number: 642-885
Exam Name/Title: Deploying Cisco Service Provider Advanced Network Routing
Certification Provider: Cisco
Corresponding Certification: CCNP Service Provider

Exam Questions: 131
Updated On: May 31, 2026

Question #19

Which three statements regarding NAT64 operations are correct? (Choose three.)

A. With stateless NAT64, the source and destination IPv4 addresses are embedded in the IPv6 addresses

B. Both the stateful and stateless NAT64 methods will conserve IPv4 address usage

C. Stateful NAT64 requires the use of static translation slots so IPv6 hosts and initiate connections to IPv4 hosts.

D. NAT64 works in conjunction with DNS64

E. With stateful NAT64, many IPv6 address can be translated into one IPv4 address, thus IPv4 address conservation is achieved

Discussion 0

Correct Answer: A,D,E Vote an answer

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Question #20

When implementing source-based remote-triggered black hole filtering, which two configurations are required on the edge routers that are not the signaling router? (Choose two.)

A. A route policy to set the redistributed static routes with the no-export BGP community

B. Redistribution into BGP of the static route that points to the IP address of the attacker

C. uRPF on all external facing interfaces at the edge routers

D. A static route pointing to the IP address of the attacker

E. A static route to a prefix that is not used in the network with a next hop set to the Null0 interface

Discussion 0

Correct Answer: C,E Vote an answer

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Question #21

On the PE5 router, which statementis correct regarding the learned BGP prefixes?

A. All prefixes learned on PE5 has the default local preference value

B. The 209.165.202.128/27 prefix is originated by the 10.0.1.1 IBGP peer

C. The 209.165.201.0/27 prefix is received from the 10.0.1.1 IBGP peer which is a route reflector

D. The 172.16.66.0/24 prefix BGP next-hop points to the route reflector

Discussion 0

Correct Answer: A Vote an answer

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Question #22

Which three statements regarding the BGP operations are correct? (Choose three)

A. The BGP session between PE5 and P1 is established using the loopback interface and
next-hop-self

B. PE5 is using the IS-IS route to reach the BGP next-hop for the 172.16.66.0/24 prefix

C. PE5 is the route reflector with P1 and PE6 as its client

D. The BGP session between PE5 and CE5 is established using the loopback interface

E. PE5 has BGP route dampening enabled

Discussion 0

Correct Answer: A,C,E Vote an answer

Question #23

Which command configures a Source Specific Multicast on a Cisco IOS XR router?

A. configure interface all enable exit router igmp version 3 commit

B. configure multicast-routing address-family ipv4 interface all enable exit router igmp version 1 commit

C. configure multicast-routing address-family ipv4 interface all enable exit router igmp version 2 commit

D. configure multicast-routing address-family ipv4 interface all enable exit router igmp version 3 commit

Discussion 0

Correct Answer: D Vote an answer

Question #24

Which multicast group range is reserved for SSM?

A. 232.0.0.0/8

B. 225.0.0.0/8

C. 239.0.0.0/8

D. 224.0.0.0/8

Discussion 0

Correct Answer: A Vote an answer

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Question #25

Refer to the exhibit.

Which configuration ensures that RR2 does not send the same updates to PE2 that RR1 learns via PE1?

A. RR1 and RR2 should have different router IDs.

B. RR1 and RR2 should have the same cluster IDs.

C. RR1 and RR2 should have the same router IDs.

D. RR1 and RR2 should have different originator IDs.

Discussion 0

Correct Answer: B Vote an answer

Question #26

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 209.165.202.128/28 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 !

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 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 !

D. 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

Discussion 0

Correct Answer: D Vote an answer

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Question #27

An SP core is running PIM on the network. Multicast groups in this networkare in the 232.0.0.0/8 range. Which commandenables multicast routing operations without using an RP?

A. ip pim register-source

B. ip pim bidir-enable

C. ip pim autorp

D. ip pim ssm default

Discussion 0

Correct Answer: D Vote an answer

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