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
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  • Jun 18,2018
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Q331. Which problem can result when private AS numbers are included in advertisements that are sent to the global Internet BGP table? 

A. The prefixes sent with private AS numbers are always discarded on the Internet. 

B. The prefixes sent with private AS numbers are always tagged as invalid on the Internet. 

C. The prefixes sent with private AS numbers lack uniqueness, which can lead to a loss of connectivity. 

D. The prefixes sent with private AS numbers are sometimes tagged as invalid on the Internet. 



Private AS numbers are not meant to be used for global Internet BGP routing, as they are assigned locally and can be used by any organization. They are meant to enable BGP within a enterprise or VPN, but since these numbers can be used by any organization they are not unique and could cause connectivity loss if leaked to the Internet. 

Q332. What are the two requirements for BGP to install a classful network into the BGP routing table? (Choose two) 

A. The AS contains the entire classfull network. 

B. A classful network statement with a lower administrative distance is in the routing table. 

C. Auto-summary is enabled. 

D. A classful network statement with a classful mask is in the routing table. 

E. Synchronization is enabled. 

F. Synchronization is disabled. 

Answer: C,D 

Q333. Which two statements about the metric-style wide statement as it applies to route redistribution are true? (Choose two.) 

A. It is used in IS-IS. 

B. It is used in OSPF. 

C. It is used in EIGRP. 

D. It is used for accepting TLV. 

E. It is used in PIM for accepting mroutes. 

F. It is used for accepting external routes. 

Answer: A,D 


To configure a router running IS-IS to generate and accept only new-style TLVs (TLV stands for type, length, and value object), use the metric-style wide command. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/TE_1208S.html#wp49409 

Q334. 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. 


Q335. Refer to the exhibit. 

Which two options are effects of the given configuration? (Choose two.) 

A. It sets the data export destination to on UDP port 49152. 

B. It enables Cisco Express Forwarding on interface FastEthernet0/0. 

C. It configures the export process to include the BGP peer AS of the router gathering the data. 

D. It enables NetFlow switching on interface FastEthernet0/0. 

E. It sets the data export destination to on TCP port 49152. 

Answer: A,D 


The “ip flow-export destination 49152” command specifies that the data export destination server is using UDP port 49152. 

The “ip route-cache flow” command under the fastethernet 0/0 interface enable netflow switching on that interface. 


Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right. 



Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 


Q338. Which two events occur when a packet is decapsulated in a GRE tunnel? (Choose two.) 

A. The destination IPv4 address in the IPv4 payload is used to forward the packet. 

B. The TTL of the payload packet is decremented. 

C. The source IPv4 address in the IPv4 payload is used to forward the packet. 

D. The TTL of the payload packet is incremented. 

E. The version field in the GRE header is incremented. 

F. The GRE keepalive mechanism is reset. 

Answer: A,B 


After the GRE encapsulated packet reaches the remote tunnel endpoint router, the GRE packet is decapsulated. The destination address lookup of the outer IP header (this is the same as the tunnel destination address) will find a local address (receive) entry on the ingress line card. The first step in GRE decapsulation is to qualify the tunnel endpoint, before admitting the GRE packet into the router, based on the combination of tunnel source (the same as source IP address of outer IP header) and tunnel destination (the same as destination IP address of outer IP header). If the received packet fails tunnel admittance qualification check, the packet is dropped by the decapsulation router. On successful tunnel admittance check, the decapsulation strips the outer IP and GRE header off the packet, then starts processing the inner payload packet as a regular packet. When a tunnel endpoint decapsulates a GRE packet, which has an IPv4/IPv6 packet as the payload, the destination address in the IPv4/IPv6 payload packet header is used to forward the packet, and the TTL of the payload packet is decremented. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/addr-serv/configuration/guide/b-ipaddr-cg53asr9k/b-ipaddr-cg53asr9k_chapter_01001.html 

Q339. What is the purpose of EIGRP summary leaking? 

A. to allow a summary to be advertised conditionally on specific criteria 

B. to allow a component of a summary to be advertised in addition to the summary 

C. to allow overlapping summaries to exist on a single interface 

D. to modify the metric of the summary based on which components of the summary are operational 



When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here. 

http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685. 

Q340. Which two statements are true about unicast RPF? (Choose two.) 

A. Unicast RPF requires CEF to be enabled. 

B. Unicast RPF strict mode works better with multihomed networks. 

C. Unicast RPF strict mode supports symmetric paths. 

D. Unicast RPF strict mode supports asymmetric paths. 

E. CEF is optional with Unicast RPF, but when CEF is enabled it provides better performance. 

Answer: A,C 


Unicast RPF requires Cisco express forwarding (CEF) to function properly on the router. 

Strict Versus Loose Checking Mode 

The Unicast RPF in Strict Mode feature filters ingress IPv4 traffic in strict checking mode and forwards packets only if the following conditions are satisfied. 

. An IPv4 packet must be received at an interface with the best return path (route) to the packet source (a process called symmetric routing). There must be a route in the Forwarding Information Base (FIB) that matches the route to the receiving interface. Adding a route in the FIB can be done via static route, network statement, or dynamic routing. 

. IPv4 source addresses at the receiving interface must match the routing entry for the interface. 


http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfrpf. html 


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