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Q261. Refer to the exhibit. 

Which part of the joined group addresses list indicates that the interface has joined the EIGRP multicast group address? 

A. FF02::1 

B. FF02::1:FF00:200 

C. FF02::A 

D. FF02::2 



FF02::A is an IPv6 link-local scope multicast addresses. This address is for all devices on a wire that want to "talk" EIGRP with one another. 

Focusing specifically on FF02::A and how routers join it, we can see and say three things: 

. Local: FF02::A is local to the wire. 

. Join: Each device "joins" FF02::A by just "deciding to listen" to the IPv6 link-local scope multicast address FF02::A. Then, by extension, it listens to the corresponding MAC address for that multicast IPv6 address (33:33:00:00:00:0A). 

. Common interest: As we can see, these varying groups have something in common that they would all like to hear about. For FF02::A, the common interest --the "connection" among the devices joining that group – is that they all want to listen to or participate in EIGRP. 


Q262. Which statement about OTV is true? 

A. The overlay interface becomes active only when configuration is complete and it is manually enabled. 

B. OTV data groups can operate only in PIM sparse-mode. 

C. The overlay interface becomes active immediately when it is configured. 

D. The interface facing the OTV groups must be configured with the highest MTU possible. 



OTV has the following configuration guidelines and limitations: 

. If the same device serves as the default gateway in a VLAN interface and the OTV edge device for the VLANs being extended, configure OTV on a device (VDC or switch) that is separate from the VLAN interfaces (SVIs). 

. When possible, we recommend that you use a separate nondefault VDC for OTV to allow for better manageability and maintenance. 

. An overlay interface will only be in an up state if the overlay interface configuration is complete and enabled (no shutdown). The join interface has to be in an up state. 





Drag and drop each DHCP term on the left to the corresponding definition on the right. 


Q265. Refer to the exhibit. 

What is wrong with the configuration of this tunnel interface? 

A. ISATAP tunnels cannot use the EUI-64 address format. 

B. No tunnel destination has been specified. 

C. The tunnel source of an ISATAP tunnel must always point to a loopback interface. 

D. Router advertisements are disabled on this tunnel interface. 



Sending of IPv6 router advertisements is disabled by default on tunnel interfaces. This command reenables the sending of IPv6 router advertisements to allow client autoconfiguration: 

Example: Router(config-if)# no ipv6 nd ra suppress 


Q266. Refer to the exhibit. 

Assuming that the peer is configured correctly and the interface is up, how many neighbors will be seen in the EIGRPv6 neighbor table on this IPv6-only router? 

A. one neighbor, which will use a local router-id of 6010. AB8. . /64 

B. one neighbor, which will use a local router-id of 6020. AB8. . /64 

C. none, because EIGRPv6 only supports authenticated peers 

D. none, because of the mismatch of timers 

E. none, because there is no EIGRP router ID configured 



Configuring EIGRP for IPv6 has some restrictions; they are listed below: 

. The interfaces can be directly configured with EIGRP for IPv6, without the use of a global IPv6 address. There is no network statement in EIGRP for IPv6. 

. The router ID needs to be configured for an EIGRPv6 protocol instance before it can run. 

. EIGRP for IPv6 has a shutdown feature. Ensure that the routing process is in "no shut" mode to start running the protocol. 



Drag and drop the EIGRP term on the left to the corresponding definition on the right. 


Q268. Which two loop-prevention mechanisms are implemented in BGP? (Choose two.) 

A. A route with its own AS in the AS_PATH is dropped automatically if the route reenters its own AS. 

B. A route with its own cluster ID in the CLUSTER_LIST is dropped automatically when the route reenters its own AS. 

C. The command bgp allowas-in enables a route with its own AS_PATH to be dropped when it reenters its own AS. 

D. The command bgp bestpath as-path ignore enables the strict checking of AS_PATH so that they drop routes with their own AS in the AS_PATH. 

E. The command bgp bestpath med missing-as-worst assigns the smallest possible MED, which directly prevents a loop. 

Answer: A,B 


When dealing with the possibility of routing updates making their way back into an AS, BGP relies on the information in the AS_path for loop detection. An update that tries to make its way back into the AS it was originated from will be dropped by the border router. With the introduction of route reflectors, there is a potential for having routing loops within an AS. A routing update that leaves a cluster might find its way back inside the cluster. Loops inside the AS cannot be detected by the traditional AS_path approach because the routing updates have not left the AS yet. BGP offers two extra measures for loop avoidance inside an AS when route reflectors are configured. 

Using an Originator ID 

The originator ID is a 4-byte, optional, nontransitive BGP attribute (type code 9) that is created by the route reflector. This attribute carries the router ID of the originator of the route in the local AS. If, because of poor configuration, the update comes back to the originator, the originator ignores it. 

Using a Cluster List 

The cluster list is an optional, nontransitive BGP attribute (type code 10). Each cluster is represented with a cluster ID. 

A cluster list is a sequence of cluster IDs that an update has traversed. When a route reflector sends a route from its clients to nonclients outside the cluster, it appends the local cluster ID to the cluster list. If the route reflector receives an update whose cluster list contains the local cluster ID, the update is ignored. This is basically the same concept as the AS_path list applied between the clusters inside the AS. 


Q269. Which two statements about Cisco Express Forwarding are true? (Choose two.) 

A. Cisco Express Forwarding tables contain reachability information and adjacency tables contain forwarding information. 

B. Cisco Express Forwarding tables contain forwarding information and adjacency tables contain reachability information. 

C. Changing MAC header rewrite strings requires cache validation. 

D. Adjacency tables and Cisco Express Forwarding tables can be built separately. 

E. Adjacency tables and Cisco Express Forwarding tables require packet process-switching. 

Answer: A,D 


Main Components of CEF 

Information conventionally stored in a route cache is stored in several data structures for Cisco Express Forwarding switching. The data structures provide optimized lookup for efficient packet forwarding. The two main components of Cisco Express Forwarding operation are the forwarding information base (FIB) and the adjacency tables. The FIB is conceptually similar to a routing table or information base. A router uses this lookup table to make destination-based switching decisions during Cisco Express Forwarding operation. The FIB is updated when changes occur in the network and contains all routes known at the time. Adjacency tables maintain Layer 2 next-hop addresses for all FIB entries. This separation of the reachability information (in the Cisco Express Forwarding table) and the forwarding information (in the adjacency table), provides a number of benefits: 

. The adjacency table can be built separately from the Cisco Express Forwarding table, allowing both to be built without any packets being process-switched. 

. The MAC header rewrite used to forward a packet is not stored in cache entries, so changes in a MAC header rewrite string do not require validation of cache entries. 


Q270. Which three improvements does Cisco IOS XE Software offer over traditional IOS Software? (Choose three.) 

A. It can run applications as separate processes on multicore CPUs. 

B. It supports drivers for data plane ASICs outside of the operating system. 

C. It allows platform-dependent code to be compiled into a single image. 

D. It supports multiple IOS instances simultaneously, sharing resources and internal infrastructure for scalability. 

E. It allows platform-independent code to be abstracted into a single microkernel for portability across platforms. 

F. It uses a QNX Neutrino-based environment underneath the IOS Software. 

Answer: A,B,C