400-101 Guide

400-101 Exam Royal Pack (In Stock.)

  • 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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Q271. Which two statements about PBR route maps are true? (Choose two.) 

A. They can use extended ACLs to identify traffic. 

B. They can route unicast traffic without interface-level classification. 

C. They can be applied to both ingress and egress traffic. 

D. They can classify traffic based on prefix-lists. 

E. They can set the metric and IP precedence bits. 

Answer: A,B 

Q272. Which technology can MSDP SA filters use to filter traffic? 

A. route maps 

B. community lists 

C. prefix lists 

D. class maps 


Q273. Refer to the exhibit. 

While troubleshooting high CPU utilization on one of your Cisco Catalyst switches, you find that the issue is due to excessive flooding that is caused by STP. What can you do to prevent this issue from happening again? 

A. Disable STP completely on the switch. 

B. Change the STP version to RSTP. 

C. Configure PortFast on port-channel 1. 

D. Configure UplinkFast on the switch. 

E. Configure PortFast on interface Gi0/15. 



Topology Changes (TC) should be a rare event in a well-configured network. When a link on a switch port goes up or down, there is eventually a TC, once the STP state of the port is changing to or from forwarding. When the port is flapping, this would cause repetitive TCs and flooding. 

Ports with the STP portfast feature enabled will not cause TCs when going to or from the forwarding state. The configuration of portfast on all end-device ports (such as printers, PCs, and servers) should limit TCs to a low amount and is highly recommended. 

Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/28943-170.html 

Q274. Which feature of Cisco IOS XE Software allows for platform-independent code abstraction? 

A. its security 

B. Common Management Enabling Technology 

C. the Linux-based environment 

D. its modularity 


Q275. Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence? 

A. LSA throttling 

B. incremental SPF 

C. fast hello 

D. SPF tuning 



The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow down link-state advertisement (LSA) updates in OSPF during times of network instability. It also allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in milliseconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsolsath.html 


Drag and drop each EIGRP element on the left to the corresponding definition on the right. 


Q277. Which flag in a configuration BPDU instructs all switches to shorten their bridge table aging process from the default 300 seconds to the current forward delay value? 

A. topology change bit 

B. topology change acknowledgment bit 

C. priority bit 

D. max-age bit 



The Root Bridge continues to set the Topology Change flag (TCN bit) in all Configuration BPDUs that it sends out for a total of Forward Delay + Max Age seconds (default = 35 (20+15) seconds). This flag instructs all bridges to shorten their MAC address table (Bridge table) aging process from the default value of 300 seconds to the current Forward Delay value of the bridge (default=15 seconds). The TCA flag is set by the upstream bridge to tell the downstream bridges to stop sending TCN BPDUs. The TC flag is set in configuration BPDU by the Root Bridge to shorten the bridge table age-out period from default 300 seconds to Forward Delay seconds. 

Q278. Which three events can cause a control plane to become overwhelmed? (Choose three.) 

A. a worm attack 

B. processing a stream of jumbo packets 

C. a microburst 

D. a configuration error 

E. a reconvergence failure 

F. a device-generated FTP session 

Answer: A,D,E 

Q279. When you configure the ip pmtu command under an L2TPv3 pseudowire class, which two things can happen when a packet exceeds the L2TP path MTU? (Choose two.) 

A. The router drops the packet. 

B. The router always fragments the packet after L2TP/IP encapsulation. 

C. The router drops the packet and sends an ICMP unreachable message back to the sender only if the DF bit is set to 1. 

D. The router always fragments the packet before L2TP/IP encapsulation. 

E. The router fragments the packet after L2TP/IP encapsulation only if the DF bit is set to 0. 

F. The router fragments the packet before L2TP/IP encapsulation only if the DF bit is set to 


Answer: C,F 


If you enable the ip pmtu command in the pseudowire class, the L2TPv3 control channel participates in the path MTU discovery. When you enable this feature, the following processing is performed: 

– ICMP unreachable messages sent back to the L2TPv3 router are deciphered and the tunnel MTU is updated accordingly. In order to receive ICMP unreachable messages for fragmentation errors, the DF bit in the tunnel header is set according to the DF bit value received from the CE, or statically if the ip dfbit set option is enabled. The tunnel MTU is periodically reset to the default value based on a periodic timer. 

– ICMP unreachable messages are sent back to the clients on the CE side. ICMP unreachable messages are sent to the CE whenever IP packets arrive on the CE-PE interface and have a packet size greater than the tunnel MTU. A Layer 2 header calculationis performed before the ICMP unreachable message is sent to the CE. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/l2tpv325.html 

Q280. What is the VLAN ID range of VLANs that are eligible for pruning? 

A. 2 through 1001 

B. 1 through 1005 

C. 1 through 4096 

D. 2 through 1005 


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