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2021 Apr 400-101 exam question

Q21. Which two statements about the assert process in LAN-based PIM are true? (Choose two.) 

A. If the metrics are the same, the router with the lowest advertised routing protocol metric for that route is elected. 

B. If the metrics are the same, the router with the highest IP address on the LAN is elected. 

C. If the metrics are the same, the router with the highest advertised routing protocol metric for that route is elected. 

D. If the metrics are the same, the router with the lowest IP address on the LAN is elected. 

Answer: A,B 


Q22. Which two actions can you take to recover an interface in a errdisable state? (Choose two.) 

A. Enable UDLD on the switch. 

B. Enable errdisable recovery on the switch. 

C. Execute the shutdown command on the interface, followed by the no shutdown command. 

D. Remove the related commands from the configuration and reenter them. 

E. Enable loop guard on the switch. 

Answer: B,C 


Q23. What is the new designation for the MPLS EXP (experimental) bits? 

A. QoS bits 

B. traffic class bits 

C. flow bits 

D. precedence bits 

Answer:

Explanation: 

To avoid misunderstanding about how this field may be used, it has become increasingly necessary to rename this field. This document changes the name of the EXP field to the "Traffic Class field" ("TC field"). In doing so, it also updates documents that define the current use of the EXP field. 

Reference: https://tools.ietf.org/html/rfc5462 


Q24. Refer to the exhibit. 

What does "(received-only)" mean? 

A. The prefix 10.1.1.1 can not be advertised to any eBGP neighbor. 

B. The prefix 10.1.1.1 can not be advertised to any iBGP neighbor. 

C. BGP soft reconfiguration outbound is applied. 

D. BGP soft reconfiguration inbound is applied. 

Answer:

Explanation: 

When you configure bgp soft-configuration-inbound, all the updates received from the neighbor will be stored unmodified, regardless of the inbound policy, and these routes appear as “(received-only).” 


Q25. Which component of MPLS architecture uses protocols such as the label distribution protocol and tag distribution protocol to exchange labels? 

A. control plane 

B. data plane 

C. forwarding plane 

D. routing plane 

Answer:


Update 400-101 braindumps:

Q26. Refer to the exhibit. 

What happens to packets when traffic in the icmp-class class exceeds the policed amount? 

A. Packets are discarded and a message is logged. 

B. Packets are discarded and a trap is sent to any servers that are configured to receive traps. 

C. Packets are discarded silently. 

D. Packets are discarded and an inform is sent to any servers that are configured to receive informs. 

Answer:

Explanation: 

service-policy {input| output policy-map-name Example: 

Router(config-cp)# service-policy input control-plane-policy 

Attaches a QoS service policy to the control plane. Note the following points: 

. input --Applies the specified service policy to packets received on the control plane. 

. output --Applies the specified service policy to packets transmitted from the control plane and enables the router to silently discard packets. 

. policy-map-name --Name of a service policy map (created using the policy-mapcommand) to be attached. The name can be a maximum of 40 alphanumeric characters. 

In this case, the service policy is set to output, which drops the traffic silently per above. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/15-mt/qos-plcshp-15-mt-book/qos-plcshp-ctrl-pln-plc.html 


Q27. Which option is the most effective action to avoid packet loss due to microbursts? 

A. Implement larger buffers. 

B. Install a faster CPU. 

C. Install a faster network interface. 

D. Configure a larger tx-ring size. 

Answer:

Explanation: 

You can't avoid or prevent them as such without modifying the sending host's application/network stack so it smoothes out the bursts. However, you can manage 

microbursts by tuning the size of receive buffers / rings to absorb occasional microbursts. 


Q28. Refer to the exhibit. 

If the downstream router has a summary route configured, which two actions must you take on the local router to create the summary route that summarizes all routes from the downstream router? (Choose two.) 

A. Configure the summary address on the interface. 

B. Use 10.0.0.0 255.248.0.0 as the summary route. 

C. Configure the summary address in the EIGRP process. 

D. Use 10.0.0.0 255.252.0.0 as the summary route. 

E. Configure a route map to permit the route. 

F. Configure a distribute list in. 

Answer: A,B 

Explanation: 

Route summarization works in conjunction with the ip summary-address eigrp interface configuration command, in which additional summarization can be performed. To correctly summarize all the networks shown, the correct route to use is 10.0.0.0 255.248.0.0 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfeigrp.html 


Q29. What is a reason for an EIGRP router to send an SIA reply to a peer? 

A. to respond to an SIA query with the alternative path requested 

B. to respond to a query reporting that the prefix has gone stuck-in-active 

C. to respond to an SIA query that the router is still waiting on replies from its peers 

D. to respond to a reply reporting that the prefix has gone stuck-in-active 

Answer:


Q30. 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:

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