400-101 Guide

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  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
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  • Jun 18,2018
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Q41. Under which condition does UDP dominance occur? 

A. when TCP traffic is in the same class as UDP 

B. when UDP flows are assigned a lower priority queue 

C. when WRED is enabled 

D. when ACLs are in place to block TCP traffic 


Q42. Which two statements about the command distance bgp 90 60 120 are true? (Choose two.) 

A. Implementing the command is a Cisco best practice. 

B. The external distance it sets is preferred over the internal distance. 

C. The internal distance it sets is preferred over the external distance. 

D. The local distance it sets may conflict with the EIGRP administrative distance. 

E. The internal distance it sets may conflict with the EIGRP administrative distance. 

F. The local distance it sets may conflict with the RIP administrative distance. 

Answer: C,F 


To allow the use of external, internal, and local administrative distances that could be a better route than other external, internal, or local routes to a node, use the distance bgp command in address family or router configuration mode. To return to the default values, use the no form of this command. distance bgp external-distance internal-distance local-distance no distance bgp 

. Syntax Description 


Administrative distance for BGP external routes. External routes are routes for which the best path is learned from a neighbor external to the autonomous system. Accept table values are from 1 to 255. The default is 20. Routes with a distance of 255 are not installed in the routing table. 


Administrative distance for BGP internal routes. Internal routes are those routes that are learned from another BGP entity within the same autonomous system. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table. 


Administrative distance for BGP local routes. Local routes are those networks listed with a network router configuration command, often as back doors, for that router or for networks that are being redistributed from another process. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table. 


external-distance: 20 

internal-distance: 200 

local-distance: 200 

In this case, the internal distance is 60 and the external is 90, and the local distance is 120 (same as RIP). 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfbgp1. html#wp1113874 

Q43. Refer to the exhibit. 

Which two statements about the output are true? (Choose two.) 

A. It indicates that prefix aggregation cache export is enabled on the device. 

B. It was obtained with the show ip cache flow command. 

C. It indicates that the device is using NetFlow version 5. 

D. It indicates that the flows are being sent to a destination using an RFC1918 address. 

Answer: C,D 


C. The fourth line shows that Version 5 is being used. 

D. The third line shows that the destination server is, which of course is a private, RFC 1918 address. 


Drag and drop each MLPPP command on the left to the function it performs on the right. 


Q45. Refer to the exhibit. 

Which additional information must you specify in this configuration to capture NetFlow traffic? 

A. ingress or egress traffic 

B. the number of cache entries 

C. the flow cache active timeout 

D. the flow cache inactive timeout 



Configuring NetFlow 

Perform the following task to enable NetFlow on an interface. SUMMARY STEPS 

1. enable 

2. configure terminal 

3. interface type number 

4. ip flow {ingress | egress} 

5. exit 

6. Repeat Steps 3 through 5 to enable NetFlow on other interfaces. 

7. end 


Command or Action 


Step 1 



Router> enable Enables privileged EXEC mode. . 

Enter your password if prompted. 

Step 2 

configure terminal Example: 



Router(config)# interface ethernet 0/0 

Specifies the interface that you want to enable NetFlow on and enters interface configuration mode. 

Step 4 

ip flow {ingress | egress} 


Router(config-if)# ip flow ingress 

Enables NetFlow on the interface. 

. ingress—Captures traffic that is being received by the interface 

. egress—Captures traffic that is being transmitted by the interface 

Step 5 



Router(config-if)# exit 

(Optional) Exits interface configuration mode and enters global configuration mode. 


You need to use this command only if you want to enable NetFlow on another interface. 

Step 6 

Repeat Steps 3 through 5 to enable NetFlow on other interfaces. 

This step is optional. 

Step 7 



Router(config-if)# end Exits the current configuration mode and returns to privileged EXEC mod 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/netflow/configuration/guide/12_2sr/nf_12_2sr_boo k/cfg_nflow_data_expt.html 

Q46. Refer to the exhibit. 

IPv6 SLAAC clients that are connected to the router are unable to acquire IPv6 addresses. What is the reason for this issue? 

A. Router advertisements are not sent by the router. 

B. Duplicate address detection is disabled but is required on multiaccess networks. 

C. The interface is configured to support DHCPv6 clients only. 

D. The configured interface MTU is too low for IPv6 to be operational. 


Q47. Which two statements are true about an EPL? (Choose two.) 

A. It is a point-to-point Ethernet connection between a pair of NNIs. 

B. It allows for service multiplexing. 

C. It has a high degree of transparency. 

D. The EPL service is also referred to as E-line. 

Answer: C,D 


Ethernet private line (EPL) and Ethernet virtual private line (EVPL) are carrier Ethernet data services defined by the Metro Ethernet Forum. EPL provides a point-to-point Ethernet virtual connection (EVC) between a pair of dedicated user–network interfaces (UNIs), with a high degree of transparency. EVPL provides a point-to-point or point-to-multipoint connection between a pair of UNIs. The services are categorized as an E-Line service type, with an expectation of low frame delay, frame delay variation and frame loss ratio. EPL is implemented using a point-to-point (EVC) with no Service Multiplexing at each UNI (physical interface), i.e., all service frames at the UNI are mapped to a single EVC (a.k.a. all-to-one bundling). 

Reference: http://en.wikipedia.org/wiki/Ethernet_Private_Line 

Q48. Which two options are interface requirements for turbo flooding? (Choose two.) 

A. The interface is Ethernet. 

B. The interface is configured for ARPA encapsulation. 

C. The interface is PPP. 

D. The interface is configured for GRE encapsulation. 

E. The interface is configured for 802.1Q encapsulation. 

Answer: A,B 


In the switch, the majority of packets are forwarded in hardware; most packets do not go through the switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP flooding by a factor of about four to five times by using turbo-flooding. This feature is supported over Ethernet interfaces configured for ARPA encapsulation. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12-2_50_se/configuration/guide/scg/swiprout.html 

Q49. Which three statements about EVCs are true? (Choose three.) 

A. Spanning Tree must use MST mode on EVC ports. 

B. PAGP is supported on EVC ports. 

C. Spanning Tree must use RSTP mode on EVC ports. 

D. LACP is supported on EVC ports. 

E. Layer 2 multicast framing is supported. 

F. Bridge domain routing is required. 

Answer: A,B,D 


EVC support requires the following: 

–The spanning tree mode must be MST. 

–The dot1ad global configuration mode command must be configured. 

These Layer 2 port-based features can run with EVC configured on a port: 







Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SY/configuration/guide/sy_swcg/ethernet_virtual_connection.html 

Q50. Which statement about a P router in a Layer 3 MPLS VPN is true? 

A. It is unaware of VPN routes. 

B. It connects to customer edge routers. 

C. It participates in MPLS VPN routing. 

D. It uses the running IGP to share VPN routes. 


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