400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
  • Last Updated
  • Jun 18,2018
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Q421. Refer to exhibit. 

The router is unreachable using telnet. Which option is solution? 

A. Use an extended access list instead of standard access list. 

B. The transport output telnet command must be added. 

C. The VRF configuration must be completed. 

D. The “vrf-also” keyword must be added to the access-class configuration. 


Q422. Which two BGP attributes are optional, non-transitive attributes? (Choose two.) 

A. AS path 

B. local preference 


D. weight 

E. cluster list 

Answer: C,E 

Q423. Refer to the exhibit. 

All of the routers on this network are running RIP. If you edit the R3 RIP process configuration to reduce the number of hops from R3 to R1, which statement about the configuration change is true? 

A. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 2. 

B. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 1. 

C. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 3. 

D. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 1. 



By changing the link from R3 to R2 to not be passive, traffic can then take the direct route from R3-R2-R1 instead of the longer path of R3-R6-R5-R4-R1, resulting in two less hops. 

Q424. Refer to the exhibit. 

What is the polling frequency set by this configuration? 

A. 60 seconds 

B. 10 seconds 

C. 360 seconds 

D. 60 milliseconds 

E. 10 milliseconds 



The frequency value lists the polling interval, in seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html 

Q425. What is the most efficient way to confirm whether microbursts of traffic are occurring? 

A. Monitor the output traffic rate using the show interface command. 

B. Monitor the output traffic rate using the show controllers command. 

C. Check the CPU utilization of the router. 

D. Sniff the traffic and plot the packet rate over time. 



Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network. In order to troubleshoot microbursts, you need a packet sniffer that can capture traffic over a long period of time and allow you to analyze it in the form of a graph which displays the saturation points (packet rate during microbursts versus total available bandwidth). You can eventually trace it to the source causing the bursts (e.g. stock trading applications). 

Reference: Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 989-994). Kindle Edition. 

Q426. 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. 

Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html 

Q427. Refer to the exhibit. 

Which two statements are true regarding prefix (Choose two.) 

A. The prefix is in policy, and Cisco PfR rerouted the traffic via Et0/1 because of an OOP event. 

B. Cisco PfR is monitoring the prefix via passive NetFlow mode only. 

C. Cisco PfR is monitoring the prefix via active, fast, or active throughput IP SLA probe mode only. 

D. The prefix is in policy, and Cisco PfR did not reroute the traffic via Et0/1 because the traffic was previously in policy. 

E. Cisco PfR is monitoring the prefix via mode monitor, which provides both NetFlow and IP SLA measurements. 

Answer: D,E 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/pfr/command/pfr-cr-book/pfr-s1.html#wp2707728086 

Q428. Refer to the exhibit. 

How many EIGRP routes will appear in the routing table of R2? 

A. 0 

B. 1 

C. 2 

D. 3 



EIGRPv6 on R2 was shut down so there is no EIGRP routes on the routing table of R2. If we turn on EIGRPv6 on R2 (with “no shutdown” command) then we would see the prefix of the loopback interface of R1 in the routing table of R2. 

Note. EIGRPv6 requires the “ipv6 unicast-routing” global command to be turned on first or it will not work. 

Q429. Which two fields reside in the initial CHAP challenge packet? (Choose two.) 

A. the authentication name of the challenger 

B. a random hash value generated by the device 

C. the hashed packet type ID 

D. the packet type ID in clear text 

Answer: A,D 


When a caller A dials in to an access server B, The Access server sends across the link an initial Type 1 authentication packet called a Challenge. This Challenge packet contains a randomly generated number, an ID sequence number to identify the challenge (sent in clear text) and the authentication name of the challenger. 

Reference: http://www.rhyshaden.com/ppp.htm 


Drag and drop the StackWise stack master election rule on the left into the correct priority order on the right. 


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