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Q181. When BGP route reflectors are used, which attribute ensures that a routing loop is not created? 

A. weight 

B. local preference 

C. multiexit discriminator 

D. originator ID 

Answer: D 

Explanation: 

As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops: 

. Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored. 

. Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfbgp.html 


Q182. DRAG DROP 

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

Answer: 


Q183. Which two statements about GLBP are true? (Choose two.) 

A. Packets are forwarded by multiple routers that share one virtual IP address. 

B. The active router forwards packets received on one virtual IP and MAC address. 

C. The standby router forwards packets when the active router fails. 

D. Hosts on the network are configured with multiple gateways for load balancing. 

E. Routers in a GLBP group can share multiple virtual MAC addresses. 

Answer: A,E 


Q184. When EIGRP is used as the IPv4 PE-CE protocol, which two requirements must be configured before the BGP IPv4 address family can be configured? (Choose two.) 

A. the route distinguisher 

B. the virtual routing and forwarding instance 

C. the loopback interface 

D. the router ID 

Answer: A,B 

Explanation: 

A VRF must be created, and a route distinguisher and route target must be configured in order for the PE routers in the BGP network to carry EIGRP routes to the EIGRP CE site. The VRF must also be associated with an interface in order for the PE router to send routing updates to the CE router. Prerequisites Before this feature can be configured, MPLS and CEF must be configured in the BGP network, and multiprotocol BGP and EIGRP must be configured on all PE routers that provide VPN services to CE routers. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/seipecec.html#wp1083316 


Q185. Which three statements about DMVPN are true? (Choose three.) 

A. It facilitates zero-touch configuration for addition of new spokes. 

B. It supports dynamically addressed spokes using DHCP. 

C. It features automatic IPsec triggering for building an IPsec tunnel. 

D. It requires uses of IPsec to build the DMVPN cloud. 

E. Spokes can build tunnels to other spokes and exchange traffic directly. 

F. It supports server load balancing on the spokes. 

Answer: A,C,E 


Q186. In the DiffServ model, which class represents the lowest priority with the highest drop probability? 

A. AF11 

B. AF13 

C. AF41 

D. AF43 

Answer: B 

Explanation: 

Assured Forwarding (AF) Behavior Group 

Class 1 

Class 2 

Class 3 

Class 4 

Low Drop 

AF11 (DSCP 10) 

AF21 (DSCP 18) 

AF31 (DSCP 26) 

AF41 (DSCP 34) 

Med Drop 

AF12 (DSCP 12) 

AF22 (DSCP 20) 

AF32 (DSCP 28) 

AF42 (DSCP 36) 

High Drop 

AF13 (DSCP 14) 

AF23 (DSCP 22) 

AF33 (DSCP 30) 

AF43 (DSCP 38) 

Reference: http://en.wikipedia.org/wiki/Differentiated_services 


Q187. Refer to the exhibit. 

R1 is performing mutual redistribution, but OSPF routes from R3 are unable to reach R2. Which three options are possible reasons for this behavior? (Choose three.) 

A. R1 requires a seed metric to redistribute RIP. 

B. The RIP version supports only classful subnet masks. 

C. R1 is filtering OSPF routes when redistributing into RIP. 

D. R3 and R1 have the same router ID. 

E. R1 and R3 have an MTU mismatch. 

F. R2 is configured to offset OSPF routes with a metric of 16. 

Answer: A,C,F 

Explanation: 

A. RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a "starter metric" that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP's sole metric is hop count. We've got to give RIP a metric it understands when redistributing routes into that protocol, so let's go back to R1 and do so. 

C. Filtering routes is another explanation, if the routes to R2 are boing filtered from being advertised to R1. 

F. If the metric is offset to 16, then the routes will have reached the maximum hop count when redistributed to RIP. The max hop count for RIP is 16. 


Q188. Which two statements about OSPF default route injection are true? (Choose two.) 

A. The ABR requires manual configuration to send a default route into an NSSA area. 

B. The ABR injects a default route into a Totally Stub Area. 

C. In a stub area, the ASBR generates a summary LSA with link-state ID 0.0.0.0. 

D. If the default route is missing from the routing table, the ASBR can use the default-information originate command to advertise the default into the OSPF domain. 

E. By default, OSPF normal areas will generate default routes into the routing domain if a default route exists. 

Answer: A,B 


Q189. 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 


Q190. Refer to the exhibit. 

Which statement about the topology is true? 

A. It provides a transparent LAN service. 

B. It provides only point-to-multipoint connections between UNIs. 

C. It uses port-based connections at the hub. 

D. It provides point-to-point connections between UNIs. 

Answer: D