how many questions of 642-885 exam question?

Q1. Which three statements regarding the BGP operations are correct? (Choose three) 

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

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

C. PE5 has BGP route dampening enabled 

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

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

View Answer

Q2. 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 static route to a prefix that is not used in the network with a next hop set to the Null0 interface 

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

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

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

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

View Answer

Q3. Which field in the IPv6 header can be used to set the DSCP value? 

A. Flow Label 

B. Type of Service 

C. Traffic Class 

D. Precedence 

E. EXP 

View Answer

Q4. In Cisco IOS-XR, the maximum-prefix command, to control the number of prefixes that can be installed from a BGP neighbor, is configured under which configuration mode? 

A. RP/0/RSP0/CPU0:P2(config-bgp)# 

B. RP/0/RSP0/CPU0:P2(config-bgp-af)# 

C. RP/0/RSP0/CPU0:P2(config-bgp-nbr)# 

D. RP/0/RSP0/CPU0:P2(config-bgp-nbr-af)# 

View Answer

Q5. When implementing high-availability stateful switchover BGP routing, in which situation would Cisco NSR be required? 

A. On the PE routers connecting to the CE routers which are not NSF aware or are not NSF capable 

B. On the PE routers connecting to the CE routers which support graceful restart 

C. On the PE routers connecting to the CE routers which are incapable of performing stateful switchover operations because the CE routers are only NSF aware but not NSF capable 

D. On the PE routers connecting to the CE routers which are incapable of performing stateful switchover operations because the CE routers are only NSF capable but not NSF aware 

E. On the service provider core P routers which are also NSF aware 

F. On the service provider core P routers which are also NSF capable 

View Answer

Q6. What is one of the configuration errors within an AS that can stop a Cisco IOS-XR router from announcing certain prefixes to its EBGP peers? 

A. Some prefixes were mistagged with the no-export BGP community 

B. Some prefixes were set with an MED of 0 

C. The outbound BGP route policy only has set actions defined without any pass actions defined 

D. The inbound BGP route policy only has set actions defined without any pass actions defined 

View Answer

Q7. Which three statements regarding NAT64 operations are correct? (Choose three.) 

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

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

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

D. NAT64 works in conjunction with DNS64 

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

View Answer

Q8. The IPv6 2002::/16 prefix is used in which kind of implementations? 

A. 6RD 

B. 6to4 

C. NAT64 

D. IPv6 Multicast 

View Answer

Q9. With PIM-SM operations, which four pieces of information are maintained in the multicast routing table for each (*,G) or (S,G) entry? (Choose four.) 

A. RPF Neighbor 

B. RP Set 

C. Incoming Interface 

D. OIL 

E. DF priority 

F. PIM SM state flags 

View Answer

Q10. Refer to the Cisco IOS DHCPv6 configuration shown in the exhibit. 

Which statement is correct? 

A. The configuration is missing a command under interface Gi0/1 to indicate to the attached hosts to use stateful DHCPv6 to obtain their IPv6 addresses 

B. The IPv6 router advertisements indicate to the attached hosts on the Gi0/1 interface to get other information besides their IPv6 address via stateless auto configuration 

C. The IPv6 DHCPv6 server pool configuration is misconfigured 

D. The DNS server address can also be imported from another upstream DHCPv6 server 

View Answer