400-101 Guide

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  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
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A Review Of Practical 400-101 pdf

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2017 Mar 400-101 sample question

Q11. Which regular expression will match prefixes from the AS 200 that is directly connected to our AS? 

A. ^$ 

B. ^200) 

C. _200$ 

D. _200_ 

E. ^200_ 

Answer:

Explanation: 

Table 2 

Commonly Used Regular Expressions 

Expression 

Meaning 

Anything 

^$ 

Locally originated routes 

^100_ 

Learned from autonomous system 100 

_100$ 

Originated in autonomous system 100 

_100_ 

Any instance of autonomous system 100 

^[0-9]+$ 

Directly connected autonomous system paths 

Reference: 

http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_bo ok/tsv_reg_express.html 


Q12. Refer to the exhibit. 

Two multicast domains are configured as shown and connected with MSDP, but the two 

domains are unable to communicate. Which two actions can you take to correct the problem? (Choose two.) 

A. Change the peering IP address in AS 65220 to 10.0.0.20. 

B. Change the peering AS on R2 to 65210. 

C. Verify that UDP port 639 is open. 

D. Verify that TCP port 139 is open. 

E. Change the MSDP originator-id to GigabitEthernet 0/0/0 on both routers. 

F. Change the MSDP peering IP address on R2 to 172.16.1.13. 

Answer: A,B 


Q13. DRAG DROP 

Drag and drop the DMVPN command on the left to the corresponding function on the right. 

Answer: 


Q14. Refer to the exhibit. 

Which two issues can cause the interface VLAN10 to be down/down? (Choose two.) 

A. The VLAN is inactive or has been removed from the VLAN database. 

B. STP is in a forwarding state on the port. 

C. A Layer 2 access port is configured with VLAN10, but is in a down/down state. 

D. The autostate exclude feature was used on interface VLAN10. 

Answer: A,C 


Q15. Which statement about NAT64 is true? 

A. It uses one-to-one mapping between IPv6 addresses and IPv4 addresses. 

B. It requires static address mapping between IPv6 addresses and IPv4 addresses. 

C. It can be used to translate an IPv6 network to another IPv6 network. 

D. It can be configured for stateless and stateful translation. 

Answer:


Replace 400-101 exam question:

Q16. Which three responses can a remote RADIUS server return to a client? (Choose three.) 

A. Reject-Challenge 

B. Access-Reject 

C. Accept-Confirmed 

D. Access-Accept 

E. Access-Challenge 

F. Reject-Access 

Answer: B,D,E 


Q17. Which two values comprise the VPN ID for an MPLS VPN? (Choose two.) 

A. an OUI 

B. a VPN index 

C. a route distinguisher 

D. a 16-bit AS number 

E. a 32-bit IP address 

Answer: A,B 

Explanation: 

Each MPLS VPN ID defined by RFC 2685 consists of the following elements: 

. An Organizational Unique Identifier (OUI), a three-octet hex number: The IEEE Registration Authority assigns OUIs to any company that manufactures 

components under the ISO/IEC 8802 standard. The OUI is used to generate universal LAN MAC addresses and protocol identifiers for use in local and metropolitan area network applications. For example, an OUI for Cisco Systems is 00-03-6B (hex). 

. A Virtual Private Network (VPN) index: a four-octet hex number, which identifies the VPN within the company. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/15-mt/mp-l3-vpns-15-mt-book/mp-assgn-id-vpn.html 


Q18. 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:

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 


Q19. Refer to the exhibit. 

What is wrong with the configuration of this tunnel interface? 

A. ISATAP tunnels cannot use the EUI-64 address format. 

B. No tunnel destination has been specified. 

C. The tunnel source of an ISATAP tunnel must always point to a loopback interface. 

D. Router advertisements are disabled on this tunnel interface. 

Answer:

Explanation: 

Sending of IPv6 router advertisements is disabled by default on tunnel interfaces. This command reenables the sending of IPv6 router advertisements to allow client autoconfiguration: 

Example: Router(config-if)# no ipv6 nd ra suppress 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-book/ip6-isatap-xe.html 


Q20. Refer to the exhibit. 

Why is the router not accessible via Telnet on the GigabitEthernet0 management interface? 

A. The wrong port is being used in the telnet-acl access list. 

B. The subnet mask is incorrect in the telnet-acl access list. 

C. The log keyword needs to be removed from the telnet-acl access list. 

D. The access class needs to have the vrf-also keyword added. 

Answer:

Explanation: 

The correct command should be “access-class telnet-acl in vrf-also”. If you do not specify the vrf-also keyword, incoming Telnet connections from interfaces that are part of a VRF are rejected. 


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