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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Ultimate Guide: cisco 400 101

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Q471. A TCP/IP host is able to transmit small amounts of data (typically less than 1500 bytes), but attempts to transmit larger amounts of data hang and then time out. What is the cause of this problem? 

A. A link is flapping between two intermediate devices. 

B. The processor of an intermediate router is averaging 90 percent utilization. 

C. A port on the switch that is connected to the TCP/IP host is duplicating traffic and sending it to a port that has a sniffer attached. 

D. There is a PMTUD failure in the network path. 



Sometimes, over some IP paths, a TCP/IP node can send small amounts of data (typically less than 1500 bytes) with no difficulty, but transmission attempts with larger amounts of data hang, then time out. Often this is observed as a unidirectional problem in that large data transfers succeed in one direction but fail in the other direction. This problem is likely caused by the TCP MSS value, PMTUD failure, different LAN media types, or defective links. 

Reference: http://www.cisco.com/c/en/us/support/docs/additional-legacy-protocols/ms-windows-networking/13709-38.html 

Q472. Which three statements about OSPFv3 address families are true? (Choose three.) 

A. Each address family requires the same instance ID. 

B. Address families can perform route redistribution into any IPv4 routing protocol. 

C. An address family can have two device processes on each interface. 

D. IPv4 address family require an IPv4 address to be configured on the interface. 

E. Each address family uses a different shortest path tree. 

F. Different address families can share the same link state database. 

Answer: B,D,E 

Q473. Which two statements about HSRP are true? (Choose two.) 

A. Its virtual MAC is 0000.0C07.Acxx. 

B. Its multicast virtual MAC is 0000.5E00.01xx. 

C. Its default configuration allows for pre-emption. 

D. It supports tracking. 

E. It supports unique virtual MAC addresses. 

Answer: A,D 


Default HSRP Configuration 


Default Setting 

HSRP version 

Version 1 

HSRP groups 

None configured 

Standby group number 

Standby MAC address 

System assigned as: 0000.0c07.acXX, where XX is the HSRP group number 

Standby priority 


Standby delay 

0 (no delay) 

Standby track interface priority 


Standby hello time 

3 seconds 

Standby holdtime 

10 seconds 

. The standby track interface configuration command ties the router hot standby priority to the availability of its interfaces and is useful for tracking interfaces that are not configured for HSRP. When a tracked interface fails, the hot standby priority on the device on which tracking has been configured decreases by 10. If an interface is not tracked, its state changes do not affect the hot standby priority of the configured device. For each interface configured for hot standby, you can configure a separate list of interfaces to be tracked. 

. The standby track interface-priority interface configuration command specifies how much to decrement the hot standby priority when a tracked interface goes down. When the interface comes back up, the priority is incremented by the same amount. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_55_se/configuration/guide/3750xscg/swhsrp.html 

Q474. Which two statements about IS-IS are true? (Choose two.) 

A. The default hello interval is 10 seconds and the default hold timer is 30 seconds. 

B. The hello interval can be changed on a per-interface basis with the command isis hello-multiplier. 

C. Both routers need to have the same hello intervals and hold timers in order to form IS-IS neighbors. 

D. Both IS-IS routers need to have the same capabilities in the hello packet in order to form neighbors. 

Answer: A,B 


isis hello-interval 

To specify the length of time between hello packets that the Cisco IOS software sends, use the isis hello-interval command in interface configuration mode. By default, a value three times the hello interval seconds is advertised as the hold time in the hello packets sent. (Change the multiplier of 3 by specifying the isis hello-multiplier command.) With smaller hello intervals, topological changes are detected faster, but there is more routing traffic. The default is 10 seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfisis.ht ml 

Q475. What is the main component of Unified MPLS? 

A. Multiple IGPs in the network are used, where the loopback IP addresses of the PE routers are aggregated on the area border routers. 

B. Confederations are used to provide scalability. 

C. The loopback prefixes from one IGP area are redistributed into BGP without changing the next hop. 

D. The ABR is a BGP route reflector and sets next-hop to self for all reflected routes. 



Since the core and aggregation parts of the network are integrated and end-to-end LSPs are provided, the Unified MPLS solution is also referred to as "Seamless MPLS." New technologies or protocols are not used here, only MPLS, Label Distribution Protocol (LDP), IGP, and BGP. Since you do not want to distribute the loopback prefixes of the PE routers from one part of the network into another part, you need to carry the prefixes in BGP. The Internal Border Gateway Protocol (iBGP) is used in one network, so the next hop address of the prefixes is the loopback prefixes of the PE routers, which is not known by the IGP in the other parts of the network. This means that the next hop address cannot be used to recurse to an IGP prefix. The trick is to make the ABR routers Route Reflectors (RR) and set the next hop to self, even for the reflected iBGP prefixes. In order for this to work, a new knob is needed. 

Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116127-configure-technology-00.html 

Q476. Consider an OSPFv3 network with four parallel links between each pair of routers. Which measure can you use to reduce the CPU load and at the same time keep all links available for ECMP? 

A. Configure some interfaces as passive interface. 

B. Configure ipv6 ospf priority 0 on some interfaces. 

C. Configure some routers with a distribute list in ingress of the OSPFv3 process. 

D. Configure ipv6 ospf database-filter all out on some interfaces. 



To filter outgoing link-state advertisements (LSAs) to an Open Shortest Path First version 3 (OSPFv3) interface, use the ipv6 ospf database-filter all out command in interface configuration mode. This can be done on some of the links to reduce the CPU load while still ensuring that all links in the equal cost path are still being used. 


Drag and Drop Cisco PFR adjacency types. 


Q478. Refer to the exhibit. 

Which two route types are advertised by a router with this configuration? (Choose two.) 

A. connected 

B. external 

C. summary 

D. static 

E. redistributed 

Answer: A,C 

Q479. Which command do you use to connect a dense-mode domain to a sparse-mode multicast domain? 

A. none, because there is no such command 

B. ip pim spt-threshold infinity 

C. ip pim register dense-mode 

D. ip pim dense-mode proxy-register 



For IP PIM multicast, Cisco recommends Sparse-Mode over Dense-Mode. In the midst of our network migration, we have a new network operating in Sparse-Mode with Anycast rendezvous point (RP) but our existing network is still operating in Dense-Mode. To bridge two different modes across both PIM domains, we should use the ip pim dense-mode proxy-register command on the interface leading toward the bordering dense mode region. This configuration will enable the border router to register traffic from the dense mode region (which has no concept of registration) with the RP in the sparse mode domain. 

Reference: http://networkerslog.blogspot.com/2010/12/bridging-dense-mode-pim-to-sparse-mode.html 

Q480. A configuration includes the line ip route permanent. 

Which option is a benefit of configuring this static route as permanent? 

A. It allows the route to be redistributed into the network even if the outgoing interface is down. 

B. It allows the route to be saved in the running configuration of the device. 

C. It places a hidden tag on the route that can be matched on other devices. 

D. It allows the route to have a tracking status even if no tracking object is configured. 


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