Free Download Cisco 642-885 Practice Tests with PDF & VCE (51-60)

By | April 11, 2014

QUESTION 51
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.    NAT64
B.    6RD
C.    6to4 tunnels
D.    Carrier-grade NAT

Answer: D

QUESTION 52
Which IPv6 mechanism occurs between a provider edge router and the customer premises equipment router to allow an ISP to automate the process of assigning a block of IPv6 addresses to a customer for use within the customer network?

A.    Router Advertisement
B.    DHCPv6 Prefix Delegation
C.    DHCPv6 Lite
D.    Stateful DHCPv6

Answer: B

QUESTION 53
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

Answer: ACD

QUESTION 54
Which type of DNS record is used for IPv6 forward lookups?

A.    A records
B.    AAAA records
C.    PTR records
D.    MX records

Answer: B

QUESTION 55
What is enabled by default on Cisco IOS-XR routers and cannot be disabled?

A.    SSH server
B.    Multicast routing
C.    IPv4 and IPv6 CEF
D.    IPv6 routing
E.    CDP
F.    BFD

Answer: C

QUESTION 56
The IPv6 2002::/16 prefix is used in which kind of implementations?

A.    6RD
B.    6to4
C.    NAT64
D.    IPv6 Multicast

Answer: B

QUESTION 57
When implementing IP SLA icmp-echo probes on Cisco IOS-XE routers, which two options are available for IPv6? (Choose two.)

A.    flow-label
B.    hop-limit
C.    DSCP
D.    traffic-class
E.    TOS

Answer: AD

QUESTION 58
With IPv6 multicast, which feature can be used as a replacement method for static RP configuration?

A.    PIM Snooping
B.    MLD
C.    MLD Snooping
D.    Embedded RP
E.    DHCPv6

Answer: D

QUESTION 60
Which additional feature is provided using MLDv2 that is not available in MLDv1?

A.    Multicast Address Specific Queries
B.    Source filtering
C.    Done messages
D.    Report messages

Answer: B

QUESTION 60
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

Answer: A

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