Free Download Cisco 642-885 Practice Tests with PDF & VCE (11-20)

By | April 4, 2014

QUESTION 11
Which two statements regarding Auto RP operations and implementations are correct? (Choose two.)

A.    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
B.    Every PIM-SM router must be configured with the RP mapping agent IP address
C.    Candidate RPs learn the IP address of the mapping agents via periodic RP discovery messages
D.    Administrative scoping can be configured to limit the scope of the RP announcements
E.    A Reverse Path Forwarding check is done on the RP discovery messages
F.    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

Answer: AD
QUESTION 12
What is determined by running the same hash algorithm on all PIMv2 routers?

A.    The SPT from the RP to the multicast source
B.    The SPT from the last hop router to the multicast source
C.    Auto RP election
D.    Which BSR to use for a particular multicast group
E.    Which RP to use from a set of candidate RPs in the RP set

Answer: E
QUESTION 13
When configuring PIM operations, what is the effect of setting the SPT threshold to infinity?

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

Answer: D

QUESTION 14
Which multicast group range is reserved for SSM?

A.    224.0.0.0/8
B.    225.0.0.0/8
C.    232.0.0.0/8
D.    239.0.0.0/8

Answer: C

QUESTION 15
Which four statements are correct regarding MSDP configurations and operations? (Choose four.)

A.    The MSDP peers are also typically the RPs in respective routing domains.
B.    SA messages are flooded to all other MSDP peers without any restrictions
C.    On Cisco IOS, IOS-XE, and IOS-XR, the router can be configured to cache the SA messages to
reduce the join latency
D.    SA messages are used to advertise active sources in a domain
E.    MSDP establishes neighbor relationships with other MSDP peers using TCP port 639
F.    MSDP peerings on Cisco IOS, IOS-XE, and IOS-XR support MD5 or SHA1 authentication

Answer: ACDE

QUESTION 16
When verifying multicast configurations and operations on Cisco IOS-XR routers, which two statements regarding show commands are correct? (Choose two.)

A.    Use the show route ipv4 multicast command to display the incoming and outgoing interface lists for
each of the joined multicast groups
B.    Use the show pim rpf command to display the RPF information for the RP or for the multicast source
C.    Use the show mrib route command to display the (*,G) and (S,G) states information on the router
D.    Use the show mrib route command to display the configured static multicast routes

Answer: BC

QUESTION 17
Assume that the R1 router is enabled for PIM-SM and receives a multicast packet sourced from 172.16.1.100, and the R1 router has multicast receivers on the Gi0/1, Gi0/2, Gi0/3 and Gi0/4 interfaces. The multicast packet from the 172.16.1.100 source must arrive on which interface on the R1 router for it to be forwarded out the other interfaces?

image

A.    Gi0/1
B.    Gi0/2
C.    Gi0/3
D.    Gi0/4
E.    Gi0/1 or Gi0/2 or Gi0/3 or Gi0/4
F.    Gi0/2 or Gi0/3
G.    Gi0/1 or Gi0/4

Answer: A

QUESTION 18
Refer to the exhibit. Which statement correctly explains the bgp graceful-restart command?

image

A.    This command is used to enable NSR and is entered on the NSR-capable router, and also on any
NSR-aware peer
B.    This command is used to enable NSF and is entered on the NSF-capable router, and also on any
NSF-aware peer
C.    This command is only required on the NSF-capable routers to enable BGP graceful restart with the
BGP peers
D.    This command is only required on the NSF-aware routers to enable BGP graceful restart with the
BGP peers
E.    This command is only required on the NSR-capable routers to enable BGP graceful restart with the
BGP peers

Answer: B

QUESTION 19
Refer to the exhibit. Which configuration is missing to complete the configuration task of enabling BFD with the 192.168.1.1 EBGP peer?

image

A.    bfd fast-detect also needs to be enabled globally under router bgp 64500
RP/0/RSP0/CPU0:P1(config-bgp)#bfd fast-detect
B.    bfd fast-detect also needs to be enabled for the address-family under address-family ipv4 unicast
RP/0/RSP0/CPU0:P1(config-bgp-af)#bfd fast-detect
C.    bfd fast-detect also needs to be enabled for the 192.168.1.1 neighbor under neighbor 192.168.1.1
RP/0/RSP0/CPU0:P1(config-bgp-nbr)#bfd fast-detect
D.    bfd fast-detect also needs to be enabled for the 192.168.1.1 neighbor address-family under neighbor
192.168.1.1 address-family ipv4 unicast
RP/0/RSP0/CPU0:P1(config-bgp-nbr-af)#bfd fast-detect
E.    bfd fast-detect also needs to be enabled globally on the router RP/0/RSP0/CPU0:P1(config)#bfd fast-detect

Answer: C

QUESTION 20
Which two features are used to provide high availability multicast? (Choose two.)

A.    BFD
B.    NSF/SSO
C.    PIM NSR
D.    PIM triggered join
E.    IGMP triggered report
F.    MSDP

Answer: BD

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