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2021 Dec 642-885 free question
Q1. 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?
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
Q2. Given the partial BGP configuration, which configuration correctly completes the Cisco IOS-XR route reflector configuration where both the 1.1.1.1 and 2.2.2.2 routers are the clients and the
3.3.3.3 router is a non-client IBGP peer?
A. neighbor 1.1.1.1 remote-as 65123 route-reflector-client neighbor 2.2.2.2 remote-as 65123 route-reflector-client neighbor 3.3.3.3 remote-as 65123
B. neighbor 1.1.1.1 address-family ipv4 unicast remote-as 65123 route-reflector-client neighbor 2.2.2.2 address-family ipv4 unicast remote-as 65123 route-reflector-client neighbor 3.3.3.3 address-family ipv4 unicast remote-as 65123
C. neighbor 1.1.1.1 remote-as 65123 address-family ipv4 unicast route-reflector-client neighbor 2.2.2.2 remote-as 65123 address-family ipv4 unicast route-reflector-client neighbor 3.3.3.3 remote-as 65123
D. neighbor 1.1.1.1 remote-as 65123 neighbor 1.1.1.1 route-reflector-client neighbor 2.2.2.2 remote-as 65123 neighbor 2.2.2.2 route-reflector-client neighbor 3.3.3.3 remote-as 65123
Answer: C
Q3. Which of the following is a feature added in IGMPv3?
A. Support for source filtering
B. Support for Host Membership Report and a Leave Group message
C. Uses a new variation of the Host Membership Query called the Group-Specific Host Membership Query
D. Uses an election process to determine the querying router on the LAN
E. Uses an election process to determine the designated router on the LAN
F. IPv6 support
Answer: A
Q4. Refer to the exhibit for the outputs from an ASR9K router.
Why did the ping fail?
A. The ping command is missing the ipv6 option: ping ipv6 2001:db8:10:1:10::1/128
B. There is a problem with the IS-IS configurations
C. The fe80::eab7:48ff:fe2c:a180 next-hop is not reachable
D. The prefix length should be removed from the IPv6 address in the ping command: ping ipv6 2001:db8:10:1:10::1
E. IPv6 is not enabled on the Gi0/0/0/0 interface
F. The IPv6 neighbor discovery protocol is not enabled on the Gi0/0/0/0 interface
Answer: D
Q5. Refer to the Cisco IOS-XR configuration exhibit.
The Cisco IOS-XR router is unable to establish any PIM neighbor relationships. What is wrong with the configuration?
A. The configuration is missing: interface gi0/0/0/0
ip pim sparse-mode interface gi0/0/0/1 ip pim sparse-mode interface loopback0 ip pim sparse-mode
B. The configuration is missing:
multicast-routing address-family ipv4 interface gi0/0/0/0 enable interface gi0/0/0/1 enable
C. The auto-rp scoping configurations should be set to 1 not 16
D. The RP address has not been configured using the rp-address router PIM configuration command
E. PIM defaults to dense mode operations only, so PIM sparse mode must be enabled using the pim sparse-mode router PIM configuration command
Answer: B
Down to date 642-885 pdf exam:
Q6. When configuring BFD, the multiplier configuration option is used to determine which value?
A. The retry interval
B. The number of BFD packets that can be lost before the BFD peer is declared "down"
C. The minimum interval between packets accepted from the BFD peers
D. The number of BFD echo packets that will be originated by the router
E. The number of routing protocols that will use BFD for fast peer failure detection
Answer: B
Q7. Referring to the topology diagram show in the exhibit,
Which three statements are correct regarding the BGP routing updates? (Choose three.)
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: A,B,D
Q8. Refer to the Cisco IOS-XR show output exhibit.
Which statement is correct?
A. The [ ] indicates the configuration has a problem
B. The [ ] indicates the 10.1.1.1 neighbor peering session has not been established
C. The [ ] indicates the configuration was not inherited from a group
D. The [ ] indicates the configuration has not been committed
E. The [ ] indicates the corresponding BGP peer configuration has a mismatch configuration
Answer: C
Q9. 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: A,D
Q10. 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