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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Q111. Which two BGP path attributes are visible in Wireshark? (Choose two.) 

A. weight 

B. AS path 

C. local preference 

D. route maps 

Answer: B,C 

Q112. Which object tracking function tracks the combined states of multiple objects? 

A. application 

B. interface 

C. stub-object 

D. list 


Q113. Refer to the exhibit. 

The VLAN-to-MST mapping is shown. (Assume SW1 acts as root for all possible MST instances.) 

spanning-tree mst configuration name MST 

revision 2 

instance 0 vlan 1-200,301-4094 instance 1 vlan 201-300 

If this topology is deployed, which action is required for traffic to flow on VLAN 200 and 300? 

A. Map VLAN 300 to instance 0. 

B. Map VLAN 200 to instance 2. 

C. Move instance 0 root to SW2. 

D. Move instance 1 root to SW2. 

E. Map both VLANs to instance 2. 


Q114. Refer to the exhibit. 

Which two routes are included in the route update? (Choose two.) 






Answer: C,D 


This access list will permit the,,, and subnets. 

Q115. Refer to the exhibit. 

Router A and router B are physically connected over an Ethernet interface, and IS-IS is configured as shown. Which option explains why the IS-IS neighborship is not getting formed between router A and router B? 

A. same area ID 

B. same N selector 

C. same domain ID 

D. same system ID 



With IS-IS, the LSP identifier is derived from the system ID (along with the pseudonode ID and LSP number). Each IS is usually configured with one NET and in one area; each system ID within an area must be unique. The big difference between NSAP style addressing and IP style addressing is that, in general, there will be a single NSAP address for the entire router, whereas with IP there will be one IP address per interface. All ISs and ESs in a routing domain must have system IDs of the same length. All routers in an area must have the same area address. All Level 2 routers must have a unique system ID domain-wide, and all Level 1 routers must have a unique system ID area-wide. 

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml 

Q116. Which statement about the feasible distance in EIGRP is true? 

A. It is the maximum metric that should feasibly be considered for installation in the RIB. 

B. It is the minimum metric to reach the destination as stored in the topology table. 

C. It is the metric that is supplied by the best next hop toward the destination. 

D. It is the maximum metric possible based on the maximum hop count that is allowed. 



An EIGRP router advertises each destination it can reach as a route with an attached metric. This metric is called the route's reported distance (the term advertised distance has also been used in older documentation). A successor route for any given destination is chosen as having the lowest computed feasible distance; that is, the lowest sum of reported distance plus the cost to get to the advertising router. By default, an EIGRP router will store only the route with the best (lowest) feasible distance in the routing table (or, multiple routes with equivalent feasible distances). 

Reference: http://packetlife.net/blog/2010/aug/9/eigrp-feasible-successor-routes/ 

Q117. Which two Cisco IOS AAA features are available with the local database? (Choose two.) 

A. command authorization 

B. network access authorization 

C. network accounting 

D. network access authentication 

Answer: A,D 


Configuring the Local Database 

This section describes how to manage users in the local database. You can use the local database for CLI access authentication, privileged mode authentication, command authorization, network access authentication, and VPN authentication and authorization. You cannot use the local database for network access authorization. The local database does not support accounting. 

Reference: http://www.cisco.com/c/en/us/td/docs/security/asa/asa80/configuration/guide/conf_gd/aaa.h tml 

Q118. Refer to the exhibit. 

Which statement is true? 

A. 2001:DB8::1/128 is a local host route, and it can be redistributed into a dynamic routing protocol. 

B. 2001:DB8::1/128 is a local host route, and it cannot be redistributed into a dynamic routing protocol. 

C. 2001:DB8::1/128 is a local host route that was created because ipv6 unicast-routing is not enabled on this router. 

D. 2001:DB8::1/128 is a route that was put in the IPv6 routing table because one of this router's loopback interfaces has the IPv6 address 2001:DB8::1/128. 



The local routes have the administrative distance of 0. This is the same adminstrative distance as connected routes. However, when you configure redistributed connected under any routing process, the connected routes are redistributed, but the local routes are not. This behavior allows the networks to not require a large number of host routes, because the networks of the interfaces are advertised with their proper masks. These host routes are only needed on the router that owns the IP address in order to process packets destined to that IP address. 

It is normal for local host routes to be listed in the IPv4 and IPv6 routing table for IP addresses of the router's interfaces. Their purpose is to create a corresponding CEF entry as a receive entry so that the packets destined to this IP address can be processed by the router itself. These routes cannot be redistributed into any routing protocol. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-routing/116264-technote-ios-00.html 

Q119. Refer to the exhibit. 

All routers are running EIGRP and the network has converged. R3 and R4 are configured as EIGRP Stub. If the link between R1 and R3 goes down, which statement is true? 

A. R1 sends traffic destined to via R2. 

B. R2 does not have a route to in the routing table. 

C. The prefix becomes stuck-in-active on R4. 

D. R3 does not advertise to R4 anymore. 


Q120. Which two technologies are supported by EIGRP? (Choose two.) 

A. clear-text authentication 

B. MD5 authentication 

C. stub routing 

D. multiple areas 

Answer: B,C 


The IP Enhanced IGRP Route Authentication feature provides MD5 authentication of routing updates from the EIGRP routing protocol. The MD5 keyed digest in each EIGRP packet prevents the introduction of unauthorized or false routing messages from unapproved sources. The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. Stub routing is commonly used in hub-and-spoke network topologies. In a hub-and-spoke network, one or more end (stub) networks are connected to a remote device (the spoke) that is connected to one or more distribution devices (the hub). The remote device is adjacent to one or more distribution devices. The only route for IP traffic to reach the remote device is through a distribution device. 

References: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-s-book/ire-rte-auth.html http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-s-book/ire-eigrp-stub-rtg.html 

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