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2021 Mar 400-101 free practice exam
Q91. Which two statements about IPv4 and IPv6 networks are true? (Choose two.)
A. In IPv6, hosts perform fragmentation.
B. IPv6 uses a UDP checksum to verify packet integrity.
C. In IPv6, routers perform fragmentation.
D. In IPv4, fragmentation is performed by the source of the packet.
E. IPv4 uses an optional checksum at the transport layer.
F. IPv6 uses a required checksum at the network layer.
Q92. Which option is the origin code when a route is redistributed into BGP?
Q93. DRAG DROP
Drag and drop the extended ping command field on the left to its usage on the right.
Q94. Refer to the exhibit.
Which three statements about the device with this configuration are true? (Choose three.)
A. Multiple AFIs are configured on the device.
B. The authentication on 172.16.129.7 is configured incorrectly.
C. The device is configured to support MPLS VPNs.
D. This device is configured with a single AFI.
E. The authentication on 172.16.129.4 is configured incorrectly.
F. The device is configured to support L2VPNs.
Q95. Which three statements about the default behaviour of eBGP sessions are true? (Choose three.)
A. eBGP sessions between sub-ASs in different confederations transmit the next hop unchanged.
B. The next hop in an eBGP peering is the IP address of the neighbor that announced the route.
C. When a route reflector reflects a route to a client, it transmits the next hop unchanged.
D. The next hop in an eBGP peering is the loopback address of the interface that originated the route.
E. The next hop in an eBGP peering is the loopback address of the neighbor that announced the route.
F. When a route reflector reflects a route to a client, it changes the next hop to its own address.
Improve 400-101 exam question:
Q96. Refer to the exhibit.
Which two statements about this configuration are true? (Choose two.)
A. It allows 172.16.0.0/16 to be distributed into EIGRP.
B. It allows a default route to be distributed into EIGRP.
C. It allows 172.16.0.0/16 and larger subnets to be distributed into EIGRP.
D. It prevents 172.16.0.0/16 from being distributed into EIGRP.
E. It prevents a default route from being distributed into EIGRP.
F. It creates summary routes and injects them into EIGRP.
In this example, the prefix list is configured to only allow the two specific routes of 172.16.0.0/16 and the default route. Any other routes will be filtered.
Q97. In the DiffServ model, which class represents the highest priority with the lowest drop probability?
Q98. Which implementation can cause packet loss when the network includes asymmetric routing paths?
A. the use of ECMP routing
B. the use of penultimate hop popping
C. the use of Unicast RPF
D. disabling Cisco Express Forwarding
When administrators use Unicast RPF in strict mode, the packet must be received on the interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network.
Q99. Which statement describes the purpose of the Payload Type field in the RTP header?
A. It identifies the signaling protocol.
B. It identifies the codec.
C. It identifies the port numbers for RTP.
D. It identifies the port numbers for RTCP.
PT, Payload Type. 7 bits: Identifies the format of the RTP payload and determines its interpretation by the application. A profile specifies a default static mapping of payload type codes to payload formats. Additional payload type codes may be defined dynamically through non-RTP means. An RTP sender emits a single RTP payload type at any given time; this field is not intended for multiplexing separate media streams. A full list of codecs and their payload type values can be found at the link below:
Q100. Which two statements are true about RSTP? (Choose two.)
A. By default, RTSP uses a separate TCN BPDU when interoperating with 802.1D switches.
B. By default, RTSP does not use a separate TCN BPDU when interoperating with 802.1D switches.
C. If a designated port receives an inferior BPDU, it immediately triggers a reconfiguration.
D. By default, RTSP uses the topology change TC flag.
E. If a port receives a superior BPDU, it immediately replies with its own information, and no reconfiguration is triggered.
The RSTP does not have a separate topology change notification (TCN) BPDU. It uses the topology change (TC) flag to show the topology changes.