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2021 Mar 400-201 pdf exam

Q61. Which two statements about 10 Gigabit Ethernet WAN PHY mode are true? (Choose two.) 

A. The signal maps to an OC-192c/STM-64c payload. 

B. The nominal speed is 9.95328 Gbps. 

C. It is compatible with Packet Ethernet over SONET. 

D. The signal maps to an OC-768c/STM-256c payload. 

E. It is compatible with Packet over SONET. 

F. The nominal speed is 10.3125 Gbps. 

Answer: A,B 

Explanation: https://en.wikipedia.org/wiki/10_Gigabit_Ethernet 


Q62. An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enabled. Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconvenes? 

A. LDP is a Layer 2 protocol forwarding label packets before the IGP reconvened. 

B. IP packets are forwarded as soon as routes are learned over a new IGP adjacency before the label exchange happens over the new links 

C. MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP. 

D. MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed 

Answer: B 


Q63. Refer to the exhibit. 

When a traceroute is performed from a PC behind R2, the next hop on R1 for IPv4 is 10.0.1.2, and for IPv6 it is 2001:DB8:2:2. What is causing thus behavior? 

A. GigabitEthernet2/1 has a Level 1-only adjacency. This causes it to be the preferred path for the IPv6 packets. 

B. When SPF ran on R2, it calculated two equal paths to R1. It was a coincidence that than the packets choose different paths. 

C. Multitopology is enabled on R2, which causes the IPv6 packets to use a different path than the IPv4 packets. 

D. 2001:DB8:2::2 is on a Gigabit Ethernet interface. Because its speed is higher than Fast Ethernet, the IS-IS metric is preferred. 

Answer: C 


Q64. Refer to the exhibit. 

Which piece of information can be derived from this Cisco IOS XR route policy? 

A. If the destination is 227.0 0 3 or 227 0 0 13 the default table will be used for reverse path forwarding 

B. If the destination ranges between 227.0 0.3 and 227 0.0.13. the IPv4 unicast table will be used for reverse path forwarding 

C. If the destination is 227.0.0.3 or 227.0 0.13, the IPv4 unicast table will be used for reverse path forwarding 

D. If the destination ranges between 227.0.0.3 and 227.0.0.13. the multicast default table will be used for reverse path forwarding 

Answer: A 


Q65. Which is the RP address of the IPv6 multicast address FF76:0:130:1234:5678:9abc::4321? 

A. 4321:5678:9abc::30 

B. 4321:5678:9abc::13 

C. 1234:5678:9abc::130 

D. 1234:5678:9abc::1 

E. 1234:5678:9abc::13 

Answer: D 

Explanation: Reference: 

http://www.netcraftsmen.com/wp-content/uploads/2014/12/20090429-CMU-Introduction_to_IP_Multicast.pdf page 53 


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Q66. What are three main characteristics of mLDP that differ from RSVP-TE? (Choose three.) 

A. The LSPs are built from tailend to headend. 

B. The LSPs are built from headend to tailend. 

C. It supports only P2MP LSPs. 

D. It supports both P2MP and MP2MP LSPs. 

E. Signaling is periodic. 

F. No periodic signaling is performed. 

Answer: A,D,F 

Explanation: http://www.cisco.com/c/dam/en/us/products/ios-nx-os-software/multicast-label-distribution-protocol-mldp/whitepaper_c11-598929_v1.pdf 


Q67. Which information is carried in the OSPFv3 intra-area Prefix LSA? 

A. All link-local addresses 

B. All IPv6 prefix and topology information that OSPFv2 included in Router LSA and Network LSA 

C. List of options associated with the link to all other routers attached to the link 

D. All prefix-specific information that OSPFv2 included in Router LSA and Network LSA 

Answer: D 

Explanation: 

OSPFv3's new LSA, the Intra-area Prefix LSA (type 9), handles intra-area network information that was previously included in OSPFv2 type 2 LSAs. It is used in order to advertise one or more IPv6 prefixes. The prefixes are associated with router segment, stub network segment or transit network segment. Intra-area prefix LSAs (type 9) & Inter-Area-Prefix-LSA (type 3) carry all IPv6 prefix information, which, in IPv4, is included in router LSAs and network LSAs. 


Q68. In a Layer 2 VPN service, which is the default behavior of an EVC-based platform with regards to VLAN manipulation? 

A. keeps the VLAN tag of the incoming frame 

B. attaches two VLAN tags to the incoming frame 

C. removes the VLAN tag from the incoming frame 

D. removes all the VLAN tags from the incoming frame 

E. sets the VLAN tag of the incoming frame 

Answer: A 

Explanation: http://www.cisco.com/c/en/us/support/docs/routers/asr-9000-series-aggregation-services-routers/116453-technote-ios-xr-l2vpn-00.html#anc7 


Q69. An engineer is implementing an MPLS within the core of the Service Provider network. What two components are required to build the control and data plane for MPLS Label Switched Paths? (Choose two.) 

A. FIB 

B. CEF 

C. LDP 

D. LFIB 

E. OSPF 

Answer: B,C 


Q70. Refer to exhibit. NAT64 stateless configuration has been applied on RT1 router. The NAT64 prefix stateless used on this scenario is 2001:DB8:2::/96. ‘Host IPv4 only’ needs to test the connectivity with ‘Host IPv6 only’ using a ping command. Which is the correct ping command ‘Host IPv4 only’ should use? 

A. ping 27.1.1.10 

B. ping 27.1.1.10 source 2001:db8:2::7001:10A 

C. ping 2001:db8:2::7001:10A 

D. ping 2001:db8:2::112.1.1.10 

E. ping 2001:db8:2::27.1.1.10 

F. ping 2001:db8:2::1B01:10A 

Answer: A