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2021 Apr 400-101 free practice exam
Q161. Refer to the exhibit.
Which statement about this GETVPN configuration is true?
A. Co-operative key servers are configured.
B. Redundant peers are configured.
C. The key server uses multicast mode to propagate rekey messages.
D. PSK authentication is configured.
Answer: A
Q162. Which configuration sets a minimum quality of service on a Layer 2 access switch?
A. mls qos cos override
mls qos cos 2
B. mls qos cos 2
C. mls qos trust cos
mls qos cos 2
D. mls qos trust cos
E. mls qos trust dscp
Answer: A
Explanation:
The mls qos cos override interface command must be used to ensure that untrusted CoS values are explicitly set 0 (default).
Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/Qo S-SRND-Book/QoSDesign.html
Q163. Which option describes a limitation of Embedded Packet Capture?
A. It can capture data only on physical interfaces and subinterfaces.
B. It can store only packet data.
C. It can capture multicast packets only on ingress.
D. It can capture multicast packets only on egress.
Answer: C
Explanation:
Restrictions for Embedded Packet Capture
. In Cisco IOS Release 12.2(33)SRE, EPC is supported only on 7200 platform.
. EPC only captures multicast packets on ingress and does not capture the replicated packets on egress.
. Currently, the capture file can only be exported off the device; for example, TFTP or FTP servers and local disk.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/epc/configuration/15-mt/epc-15-mt-book/nm-packet-capture.html
Q164. Which two mechanisms provide Cisco IOS XE Software with control plane and data plane separation? (Choose two.)
A. Forwarding and Feature Manager
B. Forwarding Engine Driver
C. Forwarding Performance Management
D. Forwarding Information Base
Answer: A,B
Explanation:
Control Plane and Data Plane Separation
IOS XE introduces an opportunity to enable teams to now build drivers for new Data Plane ASICs outside the IOS instance and have them program to a set of standard APIs which in turn enforces Control Plane and Data Plane processing separation. IOS XE accomplishes Control Plane / Data Plane separation through the introduction of the Forwarding and Feature Manager (FFM) and its standard interface to the Forwarding Engine Driver (FED). FFM provides a set of APIs to Control Plane processes. In turn, the FFM programs the Data Plane via the FED and maintains forwarding state for the system. The FED is the instantiation of the hardware driver for the Data Plane and is provided by the platform.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xe-3sg/QA_C67-622903.html
Q165. What is the maximum number of secondary IP addresses that can be configured on a router interface?
A. 1
B. 2
C. 4
D. 1024
E. 65535
F. no limit to the number of addresses
Answer: F
Explanation:
From “IP Routing Frequently Asked Questions”
Q. What are the maximum number of secondary IP addesses that can be configured on a router interface?
.A. There are no limits on configuring secondary IP addresses on a router interface.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28745-44.html#q21
Regenerate 400-101 simulations:
Q166. Refer to the exhibit.
You have just created a new VRF on PE3. You have enabled debug ip bgp vpnv4 unicast updates on PE1, and you can see the route in the debug, but not in the BGP VPNv4 table.
Which two statements are true? (Choose two.)
A. VPNv4 is not configured between PE1 and PE3.
B. address-family ipv4 vrf is not configured on PE3.
C. After you configure route-target import 999:999 for a VRF on PE3, the route will be accepted.
D. PE1 will reject the route due to automatic route filtering.
E. After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted.
Answer: D,E
Explanation:
The route target extended community for VPLS auto-discovery defines the import and export policies that a VPLS instance uses. The export route target sets an extended community attribute number that is appended to all routes that are exported from the VPLS instance. The import route target value sets a filter that determines the routes that are accepted into the VPLS instance. Any route with a value in its import route target contained in its extended attributes field matching the value in the VPLS instance’s import route target are accepted. Otherwise the route is rejected.
Q167. Which statement about the BGP scope of the cost community is true?
A. It is shared with IBGP neighbors only.
B. It is shared with IBGP neighbors and route reflectors.
C. It is shared with EBGP neighbors only.
D. It is shared with IBGP and EBGP neighbors.
E. It is shared with IBGP and confederation peers.
Answer: E
Explanation:
The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local route preference and influence the best path selection process by assigning cost values to specific routes.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/s_bgpcc.html
Q168. Into which two pieces of information does the LISP protocol split the device identity? (Choose two.)
A. Routing Locator
B. Endpoint Identifier
C. Resource Location
D. Enterprise Identifier
E. LISP ID
F. Device ID
Answer: A,B
Q169. Refer to the exhibit.
Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them?
A. IGMP filtering
B. MLD snooping
C. IGMP snooping
D. MLD filtering
Answer: C
Explanation:
IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a network switch to listen in on the IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams. Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic.
Q170. Which statement about the bgp soft-reconfig-backup command is true?
A. It requires BGP to store all inbound and outbound updates.
B. It overrides soft reconfiguration for devices that support inbound soft reconfiguration.
C. When the peer is unable to store updates, the updates are implemented immediately.
D. It provides soft reconfiguration capabilities for peers that are unable to support route refresh.
E. It provides outbound soft reconfiguration for peers.
Answer: D