2019/June Braindump2go Cisco CCNP SP 642-885 SPADVROUTE Dumps with PDF and VCE New Updated Today! Following are some new 642-885 Exam Questions:
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New Question
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
Explanation:
Carrier Grade NAT is a large-scale NAT, capable of providing private-IPv4-to-public-IPv4 translation in the order of millions of translations. Carrier Grade NAT can support several hundred thousand subscribers with the bandwidth throughput of at least 10Gb/s full-duplex.
With IPv4 addresses reaching depletion, Carrier Grade NAT is vital in providing private IPv4 connectivity to the public IPv4 internet. In addition, Carrier Grade NAT is not limited to IPv4 NAT; it can also translate between IPv4 and IPv6 addresses.
New Question
Refer to the exhibit. Which three statements are correct regarding the Cisco IOS-XR configuration? (Choose three.)
A. This router, acting as the RP mapping agent, will send RP announcement messages to the 224.0.1.40 group
B. This router, acting as the RP mapping agent, will send RP discovery messages to the 224.0.1.39 group
C. This router is the RP mapping agent only for the 224.11.11.11 and 224.99.99.99 multicast groups
D. This router is a candidate PIM-SM RP for the 224.99.99.99 multicast group
E. This router is a candidate PIM-BIDIR RP for the 224.11.11.11 multicast group
F. IGMPv3 is enabled on all interfaces
G. Other routers will recognize this router as the RP for all multicast groups with this router loopback 0 IP address
Answer: DEF
New Question
Refer to the exhibit. XR4 must protect itself from a DOS attack against its BGP process from R1 by using the TTL security feature. Which configuration achieves this goal?
A. router bgp 100
neighbor 10.10.14.1 ttl-security
B. router bgp 100
neighbor 10.10.14.1 ttl-security hops 1
C. router bgp 100
neighbor 10.10.14.1 ttl-security hops 254
D. router bgp 100
neighbor 10.10.14.1 ttl-security hops 255
Answer: A
New Question
Each router (RTA, RTB, and RTC) has one iBGP adjacency with the route reflector router RTD. Router RTC has an iBGP route advertised by RTA, but the same route is missing from RTB. Thenetwork engineer verifies that route filtering does not deny the route advertisement. Which action corrects the problem?
A. RTD(config-router)#neighbor 192.168.1.1 route-reflector-client
RTD(config-router)#neighbor 192.168.1.1 description RTA
RTD(config-router)#neighbor 192.168.1.2 route-reflector-client
RTD(config-router)#neighbor 192.168.1.2 description RTB
B. RTC(config-router)#neighbor 192.168.1.4 route-reflector-client
RTC(config-router)#neighbor 192.168.1.4 description RTD
C. RTA(config-router)#neighbor 192.168.1.4 route-reflector-client
RTA(config-router)#neighbor 192.168.1.4 description RTD
RTB(config-router)#neighbor 192.168.1.4 route-reflector-client
RTB(config-router)#neighbor 192.168.1.4 description RTD
D. RTB(config-router)#neighbor 192.168.1.3 route-reflector-client
RTB(config-router)#neighbor 192.168.1.3 description RTC
E. RTB(config-router)#neighbor 192.168.1.3 route-reflector-client
RTB(config-router)#bgp cluster-id 192.168.1.2
RTB(config-router)#no bgp client-to-client reflection
Answer: A
New Question
Which informationdoes the multicast supported router need to forward the multicast traffic over the source or shared tree?
A. source address
B. multicast address
C. destination address
D. mGRE headers
E. MDT Data
Answer: C
New Question
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
Explanation:
http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080b8a116.shtml
New Question
Which multicast routing protocol supports dense mode, sparse mode and bidirectional mode?
A. DVMRP
B. MOSPF
C. PIM
D. MP-BGP
E. MSDP
Answer: C
New Question
To which three IP multicast groups can a multicast MAC address “01-00-5E-4D-62-B1” listen? (Choose three.)
A. 231.205.98.177
B. 231.205.99.177
C. 239.77.98.177
D. 239.205.99.177
E. 224.205.98.177
F. 224.205.99.177
Answer: ACE
New Question
Refer to the exhibit. R5 is configured as the RP for the PIM-SM domain for AS 1020. If R3 and R4 are correctly configured, which Cisco IOS-XE configuration should be done on R5 to configure it as a PIMv3 BSR router?
A. ip pim send-rp-announce loopback 0 scope 16
int gi1/3 , gi 1/4
ip pim sparse-mode
int gi 1/1
ip pim bsr-border
B. ip pim rp-candidate loopback 0
int gi1/3 , gi 1/4
ip pim sparse-mode
int gi 1/1
ip pim bsr-border
C. ip pim rp-candidate loopback 0
int gi1/3 , gi 1/4
ip pim sparse-mode
ip pim bsr-border
D. ip pim send-rp-announce loopback 0 scope 16
int gi1/3 , gi 1/4
ip pim sparse-mode
ip pim bsr-border
Answer: B
New Question
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
Explanation:
Triggered joins are sent when the primary or the secondary RPF information changes.
No RPF change prunes are sent for MoFRR streams.
mofrr
To perform a fast convergence (multicast-only fast reroute, or MoFRR) of specified routes/flows when a failure is detected on one of multiple equal-cost paths between the router and the source, use the mofrr command under PIM configuration mode.
mofrr rib acl_name
no rib acl_name
New Question
Which two statements correctly describe the RPF check when a multicast packet arrives at a router? (Choose two.)
A. The router looks up the source address in the unicast routing table to determine if the packet has arrived on the interface that is on the reverse path back to the source
B. The router looks up the destination address in the unicast routing table to determine if the packet has arrived on the interface that is on the reverse path back to the destination
C. If the packet has arrived on the interface leading back to the destination, the RPF check passes and the packet is forwarded. If the RPF check fails, the packet is dropped
D. If the packet has arrived on the interface leading back to the source, the RPF check passes and the packet is forwarded. If the RPF check fails, the packet is dropped
Answer: AD
Explanation:
Reverse Path Forwarding (RPF)
RPF is a fundamental concept in multicast routing that enables routers to correctly forward multicast traffic down the distribution tree. RPF makes use of the existing unicast routing table to determine the upstream and downstream neighbors. A router will only forward a multicast packet if it is received on the upstream interface.
This RPF check helps to guarantee that the distribution tree will be loop free.
RPF Check
When a multicast packet arrives at a router, the router will perform an RPF check on the packet.
If the RPF check is successful, the packet will be forwarded. Otherwise it will be dropped.
For traffic flowing down a source tree, the RPF check procedure works as follows:
Step 1. Router looks up the source address in the unicast routing table to determine if it has arrived on the interface that is on the reverse path back to the source.
Step 2. If packet has arrived on the interface leading back to the source, the RPF check is successful and the packet will be forwarded.
Step 3. If the RPF check in 2 fails, the packet is dropped.
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