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
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  • Jun 18,2018
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How to pass 400 101 ccie in May 2017

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Q371. An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address of the router. The router has the following interface parameters: 

mac address C601.420F.0007 

subnet 2001:DB8:0:1::/64 

A. 2001:DB8:0:1:C601:42FF:FE0F:7 

B. 2001:DB8:0:1:FFFF:C601:420F:7 

C. 2001:DB8:0:1:FE80:C601:420F:7 

D. 2001:DB8:0:1:C601:42FE:800F:7 

Answer:


Q372. Which multicast protocol uses source trees and RPF? 

A. DVMRP 

B. PIM sparse mode 

C. CBT 

D. mOSPF 

Answer:

Explanation: 

DVMRP builds a parent-child database using a constrained multicast model to build a forwarding tree rooted at the source of the multicast packets. Multicast packets are initially flooded down this source tree. If redundant paths are on the source tree, packets are not forwarded along those paths. Forwarding occurs until prune messages are received on those parent-child links, which further constrains the broadcast of multicast packets. 

Reference: DVMRP and dense-mode PIM use only source trees and use RPF as previously described. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-1_19_ea1/configuration/guide/3550scg/swmcast.html 


Q373. Which EIGRP configuration results in subsecond failover outside of the basic routing 

protocol convergence? 

A. bfd all-interfaces 

B. timers active-time disabled 

C. timers active-time 1 

D. timers nsf route-hold 20 

Answer:


Q374. Which command sets the maximum segment size for a TCP packet initiated from a router? 

A. ip mtu 

B. ip tcp adjust-mss 

C. ip tcp mss 

D. ip tcp window-size 

Answer:


Q375. Which statement is true about trunking? 

A. Cisco switches that run PVST+ do not transmit BPDUs on nonnative VLANs when using a dot1q trunk. 

B. When removing VLAN 1 from a trunk, management traffic such as CDP is no longer passed in that VLAN. 

C. DTP only supports autonegotiation on 802.1q and does not support autonegotiation for ISL. 

D. DTP is a point-to-point protocol. 

Answer:

Explanation: 

Ethernet trunk interfaces support different trunking modes. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface. To autonegotiate trunking, the interfaces must be in the same VTP domain. Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Point-to-Point Protocol. However, some internetworking devices might forward DTP frames improperly, which could cause misconfigurations. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swvlan.html 


Q376. Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI? 

A. EPL 

B. EVPL 

C. EMS 

D. ERMS 

Answer:

Explanation: 

Ethernet Relay Service (ERS or EVPL) 

An Ethernet Virtual Circuit (EVC) is used to logically connect endpoints, but multiple EVCs 

could exist per single UNI. Each EVC is distinguished by 802.1q VLAN tag identification. 

The ERS network acts as if the Ethernet frames have crossed a switched network, and certain control traffic is not carried between ends of the EVC. ERS is analogous to Frame Relay where the CE-VLAN tag plays the role of a Data-Link Connection Identifier (DLCI). The MEF term for this service is EVPL. 

Reference: http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-1/carrier_ethernet/user/guide/l2vpn51book/concepts.html 


Q377. In a PfR environment, which two statements best describe the difference between active mode monitoring and fast mode monitoring? (Choose two.) 

A. Active mode monitoring can monitor and measure actual traffic via NetFlow data collection. 

B. Fast mode monitoring can measure bursty traffic better than active mode. 

C. Active mode monitoring uses IP SLA probes for the purpose of obtaining performance characteristics of the current WAN exit link. 

D. Fast mode monitoring uses IP SLA probes via all valid exits continuously to quickly determine an alternate exit link. 

Answer: C,D 

Explanation: 

Active Monitoring 

PfR uses Cisco IOS IP Service Level Agreements (SLAs) to enable active monitoring. IP SLAs support is enabled by default. IP SLAs support allows PfR to be configured to send active probes to target IP addresses to measure the jitter and delay, determining if a prefix is out-of-policy and if the best exit is selected. The border router collects these performance statistics from the active probe and transmits this information to the master controller. 

Fast Failover Monitoring 

Fast failover monitoring enables passive and active monitoring and sets the active probes to continuously monitor all the exits (probe-all). Fast failover monitoring can be used with all types of active probes: Internet Control Message Protocol (ICMP) echo, jitter, TCP connection, and UDP echo. 

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


Q378. Refer to the exhibit. 

Which two conditions can cause this error message to be displayed on the console? (Choose two.) 

A. The EtherChannel is configured as desirable on both ends. 

B. The port-channel on the adjacent device is misconfigured. 

C. There is a speed and duplex mismatch on interface fa0/12. 

D. The EtherChannel is configured as auto on one of the interfaces. 

Answer: B,C 


Q379. What are three benefits of deploying NAT with ALG? (Choose three.) 

A. the use of dynamic ephemeral ports through a firewall 

B. the synchronization of translations between multiple streams of data 

C. the use of deep packet inspection 

D. the use of static ephemeral ports through a firewall 

E. the conversion of session layer addresses from the application payload to outside global addresses 

F. NAT traversal to support asymmetric data sessions 

Answer: A,B,C 


Q380. DRAG DROP 

Drag and drop each BGP attribute on the left to the matching description on the right. 

Answer: 


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