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
  • Last Updated
  • Jun 18,2018
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[Feb 2018] 400 101 vce

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Q251. Refer to the exhibit. 

Why is R2 unable to ping the loopback interface of R4? 

A. The local preference is too high. 

B. The weight is too low. 

C. The next hop is not reachable from R2. 

D. The route originated from within the same AS. 



Before a BGP speaker installs a route to a network in the main IP routing table, the router must know how to reach the next hop that is used to get to that network. Route reachability is verified by searching for a route to the next hop in the main IP routing table. Unlike IGP routing protocols, such as EIGRP and OSPF, which assume that a route is reachable if they learned it through a valid adjacency, BGP does not install routes that it cannot verify as reachable. If a route to the next hop for a BGP network is found in the main IP routing table, BGP assumes that the network is reachable, and that the particular BGP route might be stored in the main IP routing table. If the router receives a route to a network that is not reachable, that route continues to be stored in the incoming BGP table, adj-RIB-In, and might be seen using the show ip bgp command, but is not placed in the main IP routing table. 

Reference: https://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_II&seqNum=75 

Q252. Which two OSPF network types require the use of a DR and BDR? (Choose two.) 

A. non-broadcast networks 

B. point-to-point networks 

C. point-to-multipoint networks 

D. broadcast networks 

E. point-to-multipoint non-broadcast networks 

Answer: A,D 

Q253. Which technology facilitates neighbor IP address resolution in DMVPN? 


B. mGRE 

C. a dynamic routing protocol 




NHRP Used with a DMVPN 

NHRP is used to facilitate building a VPN and provides address resolution in DMVPN. In this context, a VPN consists of a virtual Layer 3 network that is built on top of an actual Layer 3 network. The topology you use over the VPN is largely independent of the underlying network, and the protocols you run over it are completely independent of it. The VPN network (DMVPN) is based on GRE IP logical tunnels that can be protected by adding in IPsec to encrypt the GRE IP tunnels. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html#w p1057255 

Q254. Which three statements are true about OSPFv3? (Choose three.) 

A. The only method to enable OSPFv3 on an interface is via the interface configuration mode. 

B. Multiple instances of OSPFv3 can be enabled on a single link. 

C. There are two methods to enable OSPFv3 on an interface, either via the interface configuration mode or via the router configuration mode. 

D. For OSPFv3 to function, IPv6 unicast routing must be enabled. 

E. For OSPFv3 to function, IPv6 must be enabled on the interface. 

F. Only one instance of OSPFv3 can be enabled on a single link. 

Answer: B,D,E 


Here is a list of the differences between OSPFv2 and OSPFv3: 

They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols (more on this following)) 

OSPFv3 introduces new LSA types 

OSPFv3 has different packet format 

OSPFv3 uses different flooding scope bits (U/S2/S1) 

OSPFv3 adjacencies are formed over link-local IPv6 communications 

OSPFv3 runs per-link rather than per-subnet 

OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses 

OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs) 

OSPFv3 Neighbor Authentication done with IPsec (AH) 

OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number 

Following is a simple example of OSPFv3 configuration on a Cisco IOS 12.4T router. 

ipv6 unicast-routing 

ipv6 cef 

interface GigabitEthernet 0/0 

description Area backbone interface 

ipv6 address 2001:DB8:100:1::1/64 

ipv6 ospf network broadcast 

ipv6 ospf 100 area 

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and-ipv6.html 

Q255. Which Cisco IOS VPN technology leverages IPsec, mGRE, dynamic routing protocol, NHRP, and 

Cisco Express Forwarding? 

A. FlexVPN 



D. Cisco Easy VPN 


Q256. Which statement describes the BGP add-path feature? 

A. It allows for installing multiple IBGP and EBGP routes in the routing table. 

B. It allows a network engineer to override the selected BGP path with an additional path created in the config. 

C. It allows BGP to provide backup paths to the routing table for quicker convergence. 

D. It allows multiple paths for the same prefix to be advertised. 



BGP routers and route reflectors (RRs) propagate only their best path over their sessions. The advertisement of a prefix replaces the previous announcement of that prefix (this behavior is known as an implicit withdraw). The implicit withdraw can achieve better scaling, but at the cost of path diversity. Path hiding can prevent efficient use of BGP multipath, prevent hitless planned maintenance, and can lead to MED oscillations and suboptimal hot-potato routing. Upon nexthop failures, path hiding also inhibits fast and local recovery because the network has to wait for BGP control plane convergence to restore traffic. The BGP Additional Paths feature provides a generic way of offering path diversity; the Best External or Best Internal features offer path diversity only in limited scenarios. The BGP Additional Paths feature provides a way for multiple paths for the same prefix to be advertised without the new paths implicitly replacing the previous paths. Thus, path diversity is achieved instead of path hiding. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-additional-paths.html 

Q257. Which statement about how a CE router is used in an MPLS VPN is true? 

A. It is located on the customer premises, where it peers and exchanges routes with the provider edge router. 

B. It is located on the provider premises, where it peers and exchanges routes with the customer edge router. 

C. It is located on the customer premises, but it is fully controlled by the provider, which provides a full routing table to the customer. 

D. It is located on the provider premises, and it routes only MPLS label traffic. 



Drag and drop the Metro Ethernet circuit on the left to the corresponding Service Type category on the right. 



Drag each statement about EtherChannel protocols on the left to the matching EtherChannel protocol on the right. 


Q260. Refer to the exhibit. 

How can Router X in AS70000 peer with Router Y in AS65000, in case Router Y supports only 2-byte ASNs? 

A. Router X should be configured with a remove-private-as command, because this will establish the peering session with a random private 2-byte ASN. 

B. It is not possible. Router Y must be upgraded to an image that supports 4-byte ASN. 

C. Router Y should be configured with a 4-byte AS using the local-as command. 

D. Router X should be configured with a 2-byte AS using the local-as command. 



Since router Y does not support 4-byte ASN,s it will not understand any AS numbers larger than 65535, so router X should use the local-as command on the peering statement to router Y to so that it sends in a 2-byte ASN to router Y. 

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