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2021 Apr 400-201 real exam
Q71. An IS-IS enabled router with multiple IS-IS neighbors is required to have BFD sessions with all neighbors. Which BFD mode should you use when you want to save the overhead of periodic protocol control packets?
A. echo
B. asynchronous
C. demand
D. active
Answer: C
Explanation: https://tools.ietf.org/html/rfc5880#section-3.1 RFC - 5880
Q72. How many bits are expressed by";:" in the address 2D01:DB::C:B7BA:130B?
A. 16 bits
B. 32 bits
C. 40 bits
D. 44 bits
E. 48 bits
F. 52 bits
G. 56 bits
H. 64 bits
Answer: E
Q73. When IPv6 is enabled on an interface, which three multicast addresses does the configured interface automatically join? (Choose three.)
A. FF01::2
B. FEC0::1
C. FF02:0:0:0:0:1:FF00::/104
D. FF02::1
E. FF01::1
F. FF02::2
G. FF02::D
H. FF02::5
Answer: C,D,F
Explanation:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/4_1/configuration/guides/cli_4_1/clibook/ipv6.pdf https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xml
Q74. Refer to the exhibit.
It displays the Router_3 FIB information without any OSPF LSDB optimization. An engineer wants to optimize the OSPF LSDB in accordance with RFC 1587 Considering the following restraints:
.Router_3 maintains full connectivity
.Router_2 requires the least configuration
In order to achieve the OSPF LSDB optimization on Router_3. which Cisco IOS command should the engineer use on Router_2?
A. area 1 nssa default-information-originate
B. area n nssa no-summary
area 1 nssa no-redistribution
C. area 1 nssa no-redistribution
area 1 nssa default-information-originate
D. area 1 nssa no-summary
E. area 1 nssa no-redistribution
F. area 1 nssa no-summary
area 1 nssa default-information-originate
Answer: F
Q75. An engineer wants to configure MPLS TE Fast Reroute with link protection on five routers. Which methodology can reduce configuration on the point of the local repair router and successfully complete the task?
A. Configure a backup tunnel on the PLR.
B. Enable the autotunnel backup feature.
C. Configure a backup tunnel on the tunnel head end router.
D. Enable the autotunnel primary feature.
Answer: B
Explanation: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/mpls/configuration/guide/b_mpls_cg42crs/b_mpls_cg42crs_chapter_0100.html#concept_ F19BEEEFC831436AAC9291A87F9B34E5
Update 400-201 exam question:
Q76. Which are two major changes SyncE offers over traditional Ethernet to make it suitable for clock distribution? (Choose two.)
A. SyncE introduces the concept of “Boundary Clocks” and “Transparent Clocks” improving network scalability and accuracy of clock synchronization.
B. Industry standard that guarantee interoperability, since granular details, such as specific field values are specified.
C. A mandated clock accuracy of 4.6ppm.
D. The ESMC protocol for clock selection, distribution, management, traceability, and failover.
E. High-priority synchronization packets so it can continually adjust its own oscillator.
Answer: C,D
Explanation: http://www.cisco.com/c/en/us/support/docs/optical/synchronous-optical-network-sonet/23718-timefaq-23718.html
http://cp.literature.agilent.com/litweb/pdf/5990-4386EN.pdf
Q77. In a multi-VRF scenario using OSPF as PE-CE routing protocol, which Cisco IOS command allows the CE to accepts routes from PE inside of each VRF?
A. router ospf <process id> vrf<vrf name> capability vrf-lite
B. router ospf<process id> vrf<vrf name> domain-id <value>
C. router ospf <process id> domain-id <value>
D. router ospf <process id> capability vrf-lite
Answer: A
Q78. Refer to the exhibit.
OSPF is already running with the default OSPF parameters. R1 has added a new subnet (loopback 11). What will occur in regards to SPT computing on R2 router?
A. Adding ispf command on R2 router, the entire SPT will be computed on R2 router.
B. Because 10.11.11.11/32 prefix information will be in a LSA type 3 on R2 router's OSPF database, R2 router will run partial SPF computation.
C. Adding ispf command on R2 router, R2 router will recompute only the affected part of tree.
D. Because 10.11.11.11/32 prefix will be a LSA type 1 on R2 router's OSPF database. R2 router will always run a full SPF computation, even though an OSPF optimization is applied on R2 router.
Answer: C
Q79. 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
Q80. In which way does the DS-Lite IPv6 transitioning mechanism differ from IPv6 Dual-Stack?
A. DS-Lite is a combination of tunnel and translation technologies.
B. DS-Lite is a transition technology that gives full IPv6 connectivity for IPv6 capable hosts that are on the IPv4 Internet but have no native connection to an IPv6 network.
C. DS-Lite is an automatic tunnel where the tunnel destination is determined by the IPv4 address extracted from the IPv6 address that starts with the prefix 2002::/16.
D. DS-Lite is a stateless tunneling mechanism with a lightweight and secure manner without requiring upgrades to existing IPv4 access network infrastructure.
Answer: A
Explanation: http://www.cisco.com/c/en/us/products/collateral/service-provider/carrier-grade-ipv6-solution/white_paper_c11-558744-00.html
