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2021 Mar 400-201 question
Q71. Which two statements about Unified MPLS are true? (Choose two.)
A. Unified MPLS works on Cisco IOS XR Software only.
B. Unified MPLS extends MPLS across multidomain networks in a scalable manner.
C. New technologies or protocols are not used; only MPLS, LDP, IGP, and BGP are used.
D. ABR loopback prefixes should always be redistributed from the core IGP into the aggregation IGP.
E. The RRs are part of the control path only.
Answer: B,D
Explanation: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116127-configure-technology-00.pdf
Q72. What BGP feature improves on DDOS mitigation by allowing instructions that are more granular and allow for source address, destination, address, L4 details, and packet specifics to be analyzed?
A. RCMD
B. RTBH
C. BGP Flowspec
D. BGPSec
Answer: C
Explanation:
https://supportforums.cisco.com/document/12226726/asr9000xr-understanding-bgp-flowspec-bgp-fs
Q73. Refer to the exhibit.
An engineer observes that the MC-LAG bundle is down on the active aggregation device. Which is the reason for this issue?
A. The number of configured minimum links is the same of the maximum links available in the bundle.
B. The ICCP redundancy group is configured with the same system MAC address
C. The ICCP redundancy group is configured with the system priority.
D. The number of minimum configured links is greater than the number of links operational in the bundle
Answer: D
Explanation:
https://supportforums.cisco.com/document/9868751/asr9000xr-multichassis-lag-or-mc-lag-mclag-guide130
Q74. Refer to the exhibit. What is the correct action to fix the L2TPv3 configuration?
A. At Router-A, correct the local interface in the pseudowire configuration.
B. At Router-B, correct the encapsulation in the pseudowire configuration.
C. At Router-A, correct the encapsulation in the pseudowire configuration.
D. At Router-B, correct the local interface in the pseudowire configuration.
Answer: B
Explanation:
http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/l2tpv30s.html#wp1046765
Q75. Refer to the exhibit. A web server is connected to a switch via two Gigabit Ethernet links. These two links are bundled into a single logical link that provides the aggregate bandwidth of 2 Gbps. The support engineer notices that traffic from the Internet to the web server uses both Gigabit Ethernet links. However, traffic from the web server to the Internet uses only one link.
Which CLI command on the exhibit causes this behavior?
A. lacp port-priority 32768 in interface configuration mode
B. channel-group 5 mode passive
C. lacp port-priority 32768 in global configuration mode
D. port-channel load-balance dst-mac
Answer: D
Latest 400-201 practice exam:
Q76. Refer to the exhibit. Which IOS command under the BGP VPNv4 address family implements a secondary backup path to the destination 192.168.1.1?
A. maximum-paths ibgp2
B. bgp additional-paths install
C. bgp recursion host
D. bgp advertise-best-external
Answer: B
Explanation: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/routing/command/reference/b_routing_cr42crs/b_routing_cr42crs_chapter_01.html#wp28 41279186
Q77. A company is deciding between an HVR and SVR solution in order to finalize a virtualization project proposal. Which is an advantage of a HVR solution versus a SVR solution?
A. A HVR solution implements dedicated data plane resources.
B. A HVR solution implements shared control plane resources.
C. A HVR solution introduces significant contention of resources.
D. A HVR solution implements dedicated chassis resources.
Answer: A
Explanation:
Comparison of Virtualized Routing Architectures
Category Hardware-Isolated Virtual Router Software-Isolated Virtual Router
Control plane resources (CPU, memory)
Dedicated
Shared
Data plane resources (forwarding engine, queues)
Dedicated
Shared
Chassis resources (power supplies, blowers, fabric)
Shared
Shared
Management, configuration
Dedicated
Typically shared, but varies depending on degree of virtualization
Connections between virtualized routing entities
Typically external
Typically internal, but possibly external
Per-chassis scalability (routing adjacencies, prefixes)
Increased with additional logical routers
Unaffected by additional virtual routers
Reference: http://www.cisco.com/en/US/solutions/collateral/ns341/ns524/ns562/ns573/white_paper_c1 1-512753_ns573_Networking_Solutions_White_Paper.html
Q78. Refer to the exhibit. An SP core is running MPLS with OSPF as the IGP used for Loopback propagation. LDP Synchronization is enabled per the given configuration. What will the traffic flow behavior be after a temporary outage event on PE1 Eth0/0?
A. Permanently through PE1 -> P2 -> PE4 due to lowest path metric.
B. Initially through PE1 -> P1 -> PE4, then a few seconds later, it will be over PE1 -> P2 -> PE4.
C. Permanently through PE1 -> P1 -> PE4 due to lowest path metric.
D. Initially through PE1 -> P2 -> PE4, then a few seconds later, it will be over PE1 -> P1 -> PE4
Answer: B
Q79. Which two statements about forwarding equivalence class (FEC) are true? (Choose two)
A. FEC might correspond to a destination IP subnet, but it might also correspond to any traffic class that the edge LSR considers significant.
B. FEC is a group of IP packets that is forwarded over a different path, but with the same forwarding treatment.
C. FEC is a group of IP packets that is forwarded over the same path, and with the same forwarding treatment.
D. FEC is a group of IP packets that is forwarded over a different path, but with the different forwarding treatment.
E. FEC is a group of IP packets that is forwarded over the same path, but with a different forwarding treatment.
Answer: A,C
Q80. Which are the four main functions of the Cisco IOS XR System Manager? (Choose four)
A. performs system monitoring
B. is the main IOS XR component for device drivers and software installation management
C. starts, restarts, and terminates processes in response to user configuration or RP failover
D. is responsible for the message-passing "bus" for interprocess communication
E. acts as a central repository for all process-related information
F. performs health checks
G. initiates disaster recovery based on the process health
H. invokes a dumper to collect a core dump when a process terminates abnormally
Answer: C,E,G,H