Free Download Cisco 642-885 Practice Tests with PDF & VCE (31-40)

By | April 9, 2014

QUESTION 31
Hotspot questions

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Which three statements are correct regarding the various multicast groups? (Choose three.)

A.    Currently there is no source sending traffic to the 224.1.1.1 multicast group
B.    PE5 has a Null OILforthe (*,224.0.1.40) entry
C.    PE5 has a Null OILforthe (*,224.1.1.1) entry
D.    CE5 has joined the 224.0.1.40 multicast group
E.    CE5 has a Null OILforthe (*,224.1.1.1) entry

Answer: CDE
#show ip mroute

QUESTION 32
Hotspot questions

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On the PE, which two statements are correct regarding the(192.168.156.60,224.1.1.1) entry? (Choose two,)

A.    The RPF neighbor points towards the RP
B.    The RPF neighbor is reachable overthe Gi0/0/0/1 interface
C.    The OIL contains the GiO/0/0/0 interface
D.    The IIL is Null

Answer: AC
#show ip mroute

QUESTION 33
Hotspot questions

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Which two statements are correct regarding the multicast operations on the router that is the RP? (Choose two.)

A.    It is using IGMPv3
B.    The IGMP query interval is set to 125 seconds
C.    It is using the IPv4 unicast routing table to perform the RPF checks
D.    Static multicast routes are configured on the RP

Answer: ACD
#show ip mroute
#show ip pim interface
#show ip igmp group
#show ip pim neighbor

QUESTION 34
Referring to the topology diagram show in the exhibit, which three statements are correct regarding the BGP routing updates? (Choose three.)

image

A.    The EBGP routing updates received by R1 from R5 will be propagated to the R2, R4, and R7 routers
B.    The EBGP routing updates received by R3 from R6 will be propagated to the R2 and R4 routers
C.    The EBGP routing updates received by R1 from R5 will be propagated to the R2 and R4 routers
D.    The IBGP routing updates received by R3 from R2 will be propagated to the R6 router
E.    The IBGP routing updates received by R2 from R1 will be propagated to the R3 router
F.    The IBGP routing updates received by R1 from R4 will be propagated to the R5, R7, and R2 routers

Answer: ABD

QUESTION 35
When a BGP route reflector receives an IBGP update from a non-client IBGP peer, the route
reflector will then forward the IBGP updates to which other router(s)?

A.    To the other clients only
B.    To the EBGP peers only
C.    To the EBGP peers and other clients only
D.    To the EBGP peers and other clients and non-clients

Answer: C

QUESTION 36
Which two BGP mechanisms are used to prevent routing loops when using a design with redundant route reflectors? (Choose two.)

A.    Cluster-list
B.    AS-Path
C.    Originator ID
D.    Community
E.    Origin

Answer: AC

QUESTION 37
Which two statements correctly describe the BGP ttl-security feature? (Choose two.)

A.    This feature protects the BGP processes from CPU utilization-based attacks from EBGP neighbors
which can be multiple hops away
B.    This feature prevents IBGP sessions with non-directly connected IBGP neighbors
C.    This feature will cause the EBGP updates from the router to be sent using a TTL of 1
D.    This feature needs to be configured on each participating BGP router
E.    This feature is used together with the ebgp-multihop command

Answer: AD

QUESTION 38
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

Answer: AC

QUESTION 39
Refer to the topology diagram shown in the exhibit and the partial configurations shown below.

image
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
209.165.201.144/28 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
!
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
!
route-policy test
if tag is 666 then
set next-hop 192.0.2.1
set community (no-export)
endif
end-policy
!

Answer: C

QUESTION 40
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)#

Answer: D

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