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  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
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Exam Code: 400-101 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: CCIE Routing and Switching (v5.0)
Certification Provider: Cisco
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2017 Mar 400-101 exams

Q51. Which two statements about proxy ARP are true? (Choose two.) 

A. It is supported on networks without ARP. 

B. It allows machines to spoof packets. 

C. It must be used on a network with the host on a different subnet. 

D. It requires larger ARP tables. 

E. It reduces the amount of ARP traffic. 

Answer: B,D 


Disadvantages of Proxy ARP 

Hosts have no idea of the physical details of their network and assume it to be a flat network in which they can reach any destination simply by sending an ARP request. But using ARP for everything has disadvantages. These are some of the disadvantages: 

It increases the amount of ARP traffic on your segment. 

Hosts need larger ARP tables in order to handle IP-to-MAC address mappings. 

Security can be undermined. A machine can claim to be another in order to intercept packets, an act called "spoofing." 

It does not work for networks that do not use ARP for address resolution. 

It does not generalize to all network topologies. For example, more than one router that connects two physical networks. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/13718-5.html 

Q52. Refer to the exhibit. 

If a Layer 3 switch running OSPF in a VRF-lite configuration reports this error, which action can you take to correct the problem? 

A. Set mls cef maximum-routes in the global configuration. 

B. Add the vrf-lite capability to the OSPF configuration. 

C. Upgrade the Layer 3 switch to a model that can support more routes. 

D. Configure the control plane with a larger memory allocation to support the Cisco Express Forwarding Information Base. 


Q53. Refer to the exhibit. 

You are configuring the S1 switch for the switch port that connects to the client computer. Which configuration blocks users on the port from using more than 6 Mbps of traffic and marks the traffic for a class of service of 1? 





A. Exhibit A 

B. Exhibit B 

C. Exhibit C 

D. Exhibit D 



Only option A specified that the exceed and violate actions are set to drop for traffic over the CIR of 6 Mbps, and is also configured to set all traffic with a COS of 1 using the “set cos1” command. 

Q54. Which statement about the EIGRP RTO is true? 

A. It is six times the SRTT. 

B. It is the time that it normally takes for an update to be received by a peer. 

C. It is the time that it normally takes to receive a reply to a query. 

D. It is the average time that it takes for a reliable packet to be acknowledged. 



The RTO is typically six times the SRTT, the value may vary from a minimum of 200 microseconds (ms) to a maximum of 5 seconds (s). 

Reference: EIGRP for IP: Basic Operation and Configuration, Alvaro Retana, Russ White, Don Slice - 2000 

Q55. Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.) 



C. Static routing 



Answer: D,E 


Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route—an exact matching route, or a less specific route—in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html 

Improved 400-101 test question:

Q56. Which two statements about NetFlow are true? (Choose two.) 

A. It must be configured on each router in a network. 

B. It supports ATM LAN emulation. 

C. The existing network is unaware that NetFlow is running. 

D. It uses SIP to establish sessions between neighbors. 

E. It provides resource utilization accounting. 

Answer: C,E 


NetFlow identifies packet flows for both ingress and egress IP packets. It does not involve any connection-setup protocol, either between routers or to any other networking device or end station. NetFlow does not require any change externally--either to the packets themselves or to any networking device. NetFlow is completely transparent to the existing network, including end stations and application software and network devices like LAN switches. Also, NetFlow capture and export are performed independently on each internetworking device; NetFlow need not be operational on each router in the network. NetFlow data provides fine-grained metering for highly flexible and detailed resource utilization accounting. For example, flow data includes details such as IP addresses, packet and byte counts, timestamps, type-of-service, and application ports. Service providers might utilize the information for billing based on time-of-day, bandwidth usage, application usage, or quality of service. Enterprise customers might utilize the information for departmental chargeback or cost allocation for resource utilization. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/12-4t/nf-12-4t-book/ios-netflow-ov.html 

Q57. Refer to the exhibit. 

Which statement is true? 

A. There is no issue with forwarding IPv6 traffic from this router. 

B. IPv6 traffic can be forwarded from this router, but only on Ethernet1/0. 

C. IPv6 unicast routing is not enabled on this router. 

D. Some IPv6 traffic will be blackholed from this router. 



Here we see that the IPV6 default route shows two different paths to take, one via Ethernet 1/0 and one via Ethernet 0/0. However, only Eth 1/0 shows a next hop IPV6 address (the link local IPV6 address). There is no link local next hop addressed known on Eth 0/0. Therefore, traffic to all destinations will be load balanced over the two paths, but only half of the IPv6 traffic will be sent to the correct upstream router. 

Q58. Refer to the exhibit. 

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

A. This switch is currently receiving a multicast data stream that is being forwarded out VLAN 150. 

B. A multicast receiver has requested to join one or more of the multicast groups. 

C. Group is a reserved address, and it should not be used for multicast user data transfer. 

D. One or more multicast groups are operating in PIM dense mode. 

E. One or more of the multicast data streams will be forwarded out to neighbor 

F. Group is a reserved address, and it should not be used for multicast user data transfer. 

Answer: A,B,C 


A. VLAN 150 shows up in the outgoing interface list so those specific multicast streams are being forwarded to this VLAN. 

B. A receiver has requested to receive the multicast stream associated with the multicast address of, that is why this stream appears in the mroute table. 

C. The is a reserved multicast group for cisco's Rp descovery. All cisco routers are members of this grup by default and listen to this group for Cisco RP discovery messages advertised by mapping agent even if it is not configured 



Q60. What is the purpose of Route Target Constraint? 

A. to avoid using route reflectors in MPLS VPN networks 

B. to avoid using multiple route distinguishers per VPN in MPLS VPN networks 

C. to be able to implement VPLS with BGP signaling 

D. to avoid sending unnecessary BGP VPNv4 or VPNv6 updates to the PE router 

E. to avoid BGP having to perform route refreshes 



Some service providers have a very large number of routing updates being sent from RRs to PEs, using considerable resources. A PE does not need routing updates for VRFs that are not on the PE; therefore, the PE determines that many routing updates it receives are “unwanted.” The PE can filter out the unwanted updates using Route Target Constraint. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/iproute_bgp/configuration/guide/2_xe/irg_x e_book/irg_rt_filter_xe.html. 

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