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Q11. Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.) 

A. the forwarding information base 

B. the label forwarding information base 

C. the IP routing table 

D. the label information table 

E. the adjacency table 

Answer: A,B 

Explanation: 

The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames. 

The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS. 


Q12. Which option is the default point of insertion for the BGP cost community? 

A. before best path calculation 

B. after best path calculation 

C. after the IGP metric comparison 

D. after the router ID comparison 

Answer:


Q13. Refer to the exhibit. 

Which two statements about the VPN solution are true? (Choose two.) 

A. Customer A and customer B will exchange routes with each other. 

B. R3 will advertise routes received from R1 to R2. 

C. Customer C will communicate with customer A and B. 

D. Communication between sites in VPN1 and VPN2 will be blocked. 

E. R1 and R2 will receive VPN routes advertised by R3. 

Answer: C,E 

Explanation: 

+ VPN1 exports 10:1 while VPN3 imports 10:1 so VPN3 can learn routes of VPN1. 

+ VNP1 imports 10:1 while VNP3 export 10:1 so VNP1 can learn routes of VPN3. 

-> Customer A can communicate with Customer C 

+ VPN2 exports 20:1 while VPN3 imports 20:1 so VPN3 can learn routes of VPN2. 

+ VPN2 imports 20:1 while VPN3 exports 20:1 so VPN2 can learn routes of VPN3. 

-> Customer B can communicate with Customer C 

Therefore answer C is correct. 

Also answer E is correct because R1 & R2 import R3 routes. 

Answer A is not correct because Customer A & Customer B do not import routes which are exported by other router. Customer A & B can only see Customer C. 

Answer B is not correct because a router never exports what it has learned through importation. It only exports its own routes. 

Answer D is correct because two VPN1 and VPN2 cannot see each other. Maybe in this question there are three correct answers. 


Q14. DRAG DROP 

Drag and drop the DMVPN command on the left to the corresponding function on the right. 

Answer: 


Q15. Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence? 

A. LSA throttling 

B. incremental SPF 

C. fast hello 

D. SPF tuning 

Answer:

Explanation: 

The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow down link-state advertisement (LSA) updates in OSPF during times of network instability. It also allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in milliseconds. 

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


Q16. Which action does route poisoning take that serves as a loop-prevention method? 

A. It immediately sends routing updates with an unreachable metric to all devices. 

B. It immediately sends routing updates with a metric of 255 to all devices. 

C. It prohibits a router from advertising back onto the interface from which it was learned. 

D. It advertises a route with an unreachable metric back onto the interface from which it was learned. 

E. It poisons the route by tagging it uniquely within the network. 

Answer:

Explanation: 

With route poisoning, when a router detects that one of its connected routes has failed, the router will poison the route by assigning an infinite metric to it and advertising it to neighbors. 


Q17. Refer to the exhibit. 

Video Source S is sending interactive video traffic to Video Receiver R. Router R1 has multiple routing table entries for destination R. Which load-balancing mechanism on R1 can cause out-of-order video traffic to be received by destination R? 

A. per-flow load balancing on R1 for destination R 

B. per-source-destination pair load balancing on R1 for destination R 

C. CEF load balancing on R1 for destination R 

D. per-packet load balancing on R1 for destination R 

Answer:

Explanation: 

Per-packet load balancing guarantees equal load across all links, however potentially the packets may arrive out-of-order at the destination as differential delay may exist within the network. 

Reference: http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186 a00800afeb7.html 


Q18. If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table? 

A. The route whose originator has the lower router ID. 

B. Both routes are installed. 

C. The route whose originator has the higher router ID. 

D. The first route that is learned. 

Answer:

Explanation: 

OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table. 


Q19. Refer to the exhibit. 

Which LISP component do routers in the public IP network use to forward traffic between the two networks? 

A. EID 

B. RLOC 

C. map server 

D. map resolver 

Answer:

Explanation: 

Locator ID Separation Protocol (LISP) is a network architecture and protocol that implements the use of two namespaces instead of a single IP address: 

. Endpoint identifiers (EIDs)—assigned to end hosts. 

. Routing locators (RLOCs)—assigned to devices (primarily routers) that make up the global routing system. The public networks use the RLOC to forward traffic between networks. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/15-mt/irl-15-mt-book/irl-overview.html 


Q20. Which three statements describe the characteristics of a VPLS architecture? (Choose three.) 

A. It forwards Ethernet frames. 

B. It maps MAC address destinations to IP next hops. 

C. It supports MAC address aging. 

D. It replicates broadcast and multicast frames to multiple ports. 

E. It conveys MAC address reachability information in a separate control protocol. 

F. It can suppress the flooding of traffic. 

Answer: A,C,D 

Explanation: 

As a VPLS forwards Ethernet frames at Layer 2, the operation of VPLS is exactly the same as that found within IEEE 802.1 bridges in that VPLS will self learn source MAC address to port associations, and frames are forwarded based upon the destination MAC address. Like other 802.1 bridges, MAC address aging is supported. 

Reference: http://www.cisco.com/en/US/products/hw/routers/ps368/products_white_paper09186a0080 1f6084.shtml