Thursday, September 15, 2011

CCNA Exploration2: Routing Protocols and Concepts – Chapter 11 Exam 01.


CCNA Exploration2: Routing Protocols and Concepts – Chapter 11 Exam

01.Refer to the exhibit. What does the “O*E2″ from the “O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0″ line represent?
  • an internal type 2 OSPF route.
  • an external OSPF route at least two hops away.
  • an external OSPF route from two different sources.
  • an external OSPF route that will not increment in cost.
  • a default route.
  • The route was distributed into OSPF from a type 2 router.
02.Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?
  • 2
  • 110
  • 1786
  • 1.544
03. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)
  • area id
  • K-values

  • metric value

  • hello interval

  • network type

  • interface type

04. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)
  • root router
  • backup root router
  • domain router
  • backup domain router
  • designated router
  • backup designated router
05. What does OSPF use to calculate the cost to a destination network?
  • bandwidth
  • bandwidth and hop count
  • bandwidth and reliability
  • bandwidth, load, and reliablity
06. A fully converged five router OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router looses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?
  • All routes for the entire network will be present.
  • Directly connected networks that are operational will be in the routing table.
  • Because the SPF algorithm has not completed all calculations, no routes will be in the table.
  • A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.
07.Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration statement or set of statements was entered for router B to generate the exhibited routing table?
  • B(config-router)# network 192.168.1.0 0.0.0.3 area 0
  • B(config-router)# network 10.16.1.0 0.0.0.224 area 0
  • B(config-router)# network 10.16.1.0 255.255.255.224 area 0
  • B(config-router)# network 192.168.1.0 255.255.255.255 area 0
  • B(config-router)# network 10.0.0.0 255.255.255.255 area 0
08.Refer to the exhibit. Which network command or set of commands will cause OSPF to be enabled for any R1 interface connected to the exhibited subnets?
  • R1(config-router)# network 10.0.0.0 0.0.0.0 area 0
  • R1(config-router)# network 10.1.0.0 0.0.0.255 area 0 R1(config-router)# network 10.1.1.0 0.0.0.255 area 0
    R1(config-router)# network 10.1.2.4 0.0.0.3 area 0
  • R1(config-router)# network 10.1.0.0 0.0.0.255 area 0R1(config-router)# network 10.2.0.0 0.0.0.255 area 0
  • R1(config-router)# network 10.0.0.0 0.0.255.255 area 0
09.Refer to the exhibit. What does the “2″ stand for in the router ospf 2 statement?
  • The number 2 is the autonomous system number.
  • The number 2 indicates the number of networks advertised by OSPF.
  • The number 2 identifies this particular instance of OSPF on this router.
  • The number 2 indicates the priority of the OSPF process on this router.
10.Refer to the exhibit. All routers have been configured with the interface priorities that are shown. All routers were restarted simultaneously. The results of the DR/BDR election are shown. What can be concluded about this network?
  • Router C cannot win a DR election under any circumstances.
  • If the link for interface 192.168.1.4 goes down, router B will become the new DR.
  • The highest router ID was most likely determined via an OSPF router-id statement or statements.
  • If a new router is added with a higher router ID than router D, it will become the DR.
11.Refer to the exhibit. What configuration statements would give the results that are shown in the output of the show ip protocols command?
  • B(config)# int fa0/0B(config-if)# router-id 192.168.1.5
  • B(config)# int lo0B(config-if)# ip address 192.168.1.5
  • B(config)# router ospf 1B(config-router)# router-id 192.168.1.5
  • B (config)# router ospf 1B(config-router)# ip address 192.168.1.5
12.Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete topology if a DR or BDR were not elected in this OSPF network?
  • 4
  • 5
  • 6
  • 7
  • 10
13. What is the default administrative distance for OSPF?
  • 90
  • 100
  • 110
  • 115
  • 120
14.Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and OSPF interface priorities. Loopback interfaces are not configured and all interfaces are operational. Router D is the DR and router C is the BDR.
What happens immediately after the following commands are entered on router A?
  • A(config)# interface fa0/0
  • A(config-if)# ip ospf priority 255
  • A will become the DR. D will become the BDR.
  • A will become the DR. C will remain the BDR.
  • D will remain the DR. A will become the BDR.
  • D will remain the DR. C will remain the BDR.
15.Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing table for the 10.0.0.0/24 network?
  • 2
  • 156
  • 1564
  • 1785
  • 1787
16. What range of networks will be advertised in the OSPF updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255 area 100?
  • 192.168.0.0/24 through 192.168.0.15/24
  • 192.168.0.0/24 through 192.168.15.0/24
  • 192.168.15.0/24 through 192.168.31.0/24
  • 192.168.15.0/24 through 192.168.255.0/24
  • 192.168.16.0/24 through 192.168.255.0/24
17.Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps can the administrator take to accomplish this?
shut down the loop back interface
use the OSPF router-id 192.168.100.1 command
use the clear ip ospf process command
nothing, the router-id of Router1 is already 192.168.100.1
18.Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relationship is developed between Router1 and Router2?
  • A FULL adjacency is formed.
  • A 2WAY adjacency is formed.
  • Router2 will become the DR and Router1 will become the BDR.
  • Both routers will become DROTHERS.
19.Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no configured loopback interfaces, what two roles will router B play on each network segment? (Choose two.)
  • DR for network 192.168.1.200
  • BDR for network 192.168.1.200
  • DROTHER on 192.168.1.200
  • DR for network 192.168.1.204
  • BDR for network 192.168.1.204
  • DROTHER on network 192.168.1.204
20.Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor command reveals no neighbors. What is a possible cause?
  • OSPF autonomous system IDs do not match.
  • OSPF process IDs do not match.
  • OSPF network types are identical.
  • OSPF hello or dead timers do not match.
21.Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of last resort to the other routers in OSPF area 0?
  • RouterB(config)# router ospf 10RouterB(config-router)# gateway-of-last-resort 172.16.6.6
  • RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0
  • RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10
    RouterB(config-router)# default-information originate
  • RouterB(config)# router ospf 10RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0
  • RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
  • RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10
  • RouterB(config-router)# redistribute ip default-route
22.Refer to the exhibit. RouterA, RouterB, and RouterC in the diagram are running OSPF on their Ethernet interfaces. Router D was just added to the network. Routers are configured with the loopback interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after RouterD is added to the network?
  • RouterB takes over as DR and RouterD becomes the BDR.
  • RouterD becomes the BDR and RouterA remains the DR.
  • RouterD becomes the DR and RouterA becomes the BDR.
  • RouterC acts as the DR until the election process is complete.
  • RouterD becomes the DR and RouterB remains the BDR.
  • There is no change in the DR or BDR until either current DR or BDR goes down.
23. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)
  • Elections are always optional.
  • Elections are required in all WAN networks.
  • Elections are required in point-to-point networks.
  • Elections are required in broadcast multiaccess networks.
  • Elections are sometimes required in NBMA networks.
24.Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings to advertise all attached networks. If all of the routers start at the same time, what will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)
  • HQ will be DR for 10.4.0.0/16.
  • Router A will be DR for 10.4.0.0/16.
  • HQ will be BDR for 10.4.0.0/16.
  • Router A will be DR for 10.5.0.0/16.
  • Remote will be DR for 10.5.0.0/16.
  • Remote will be BDR for 10.5.0.0/16.
25. Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?
  • any traffic through the router interfaces
  • routing database updates
  • hello packets
  • BPDU packets

CCNA Exploration2: Routing Protocols and Concepts – Chapter 10 Exam


CCNA Exploration2: Routing Protocols and Concepts – Chapter 10 Exam

01.Refer to the exhibit. When Router D is configured to use a link-state routing protocol and is added to the network, what is the first thing that it does to begin learning the network topology?
  • It sends LSP packets to Routers B and C.
  • It sends LSP packets to all routers in the network.
  • It sends Hello packets to all routers in the network.
  • It sends information about its directly connected neighbors to Routers A and E.
  • It sends information about its directly connected neighbors to all routers in the network.
  • It learns about its directly connected networks when its interfaces reach the up state.
02. What two events will cause a link state router to send LSPs to all neighbors? (Choose two.)
  • 30 second timer expires
  • whenever the network topology changes
  • immediately after the Bellman-Ford algorithm has run
  • immediately after the DUAL FSM has built the topology database
  • upon initial startup of router or routing protocol
03. What is the final step in the link state routing process?
  • successors are placed into the routing table

  • SPF computes best path to each destination network

  • LSPs are flooded to all neighbors to converge the network

  • DUAL algorithm is run to find best path to destination networks

04. What two statements correctly describe the link state routing process? (Choose two.)
  • all routers in the area have link state databases
  • each router in the area floods LSPs to all neighbors
  • LSPs use the reserved multicast address of 224.0.0.10 to reach neighbors
  • routing loops are prevented by running the Diffusing Update Algorithm (DUAL)
  • Reliable Transport Protocol (RTP) is the protocol used by for the delivery and reception of LSPs
05.Refer to the exhibit. What kind of information would be seen in an LSP sent from router JAX to router ATL?
  • hop count
  • uptime of the route
  • cost of the link
  • a list of all the routing protocols in use
06. What feature do modern link-state protocols provide to minimize processing and memory requirements?
  • splitting routing topologies into smaller areas
  • assigning lower process priorities to route calculations
  • using update timers to restrict routing updates
  • strict split horizon rules to reduce routing table entries
07. To achieve network convergence, what three steps does each link state router take? (Choose three.)
  • use automatic summarization to reduce the size of routing tables
  • build a Link State Packet (LSP) containing the state of each directly connected link
  • flood the LSP to all neighbors, who then store all LSPs received in a database
  • send hello packages at regular intervals to discover neighbors and establish adjacencies
  • construct a complete map of the topology and compute the best path to each destination network
  • use the DUAL FSM to select efficient, loop-free paths, and insert routes into the routing table
08. What speeds up convergence in a network using link-state routing?
  • updates triggered by network changes
  • updates sent at regular intervals
  • updates sent only to directly connected neighbors
  • updates that include complete routing tables
09. Why is it difficult for routing loops to occur in networks that use link-state routing?
  • Each router builds a simple view of the network based on hop count.
  • Routers flood the network with LSAs to discover routing loops.
  • Each router builds a complete and synchronized view of the network.
  • Routers use hold-down timers to prevent routing loops.
10. What are two advantages of using a link-state routing protocol instead of a distance vector routing protocol? (Choose two.)
  • The topology database eliminates the need for a routing table.
  • Each router independently determines the route to each network.
  • Link-state protocols require less router processor power than distance vector protocols.
  • After the inital LSP flooding, they generally require less bandwidth to communicate changes in a topology.
  • Frequent periodic updates are sent to minimize the number of incorrect routes in the topological database.
11. Which algorithm is run by link-state routing protocols to calculate the shortest path to destination networks?
  • DUAL
  • Dijkstra
  • Bellman-Ford
  • Diffie-Hellman
12.Refer to the exhibit. Which statement correctly describes the path traffic would take from the 10.0.0.0/24 network to the 192.168.1.0/24 network if a link-state routing protocol was in use?
  • BOS -> ATL because this path is the least hops
  • BOS -> ATL because this path is highest cost
  • BOS -> ORL -> JAX -> ATL because this path is the lowest cost
  • traffic would load balance across all links
13. Which database or table must be identical on all link-state routers within an area in order to construct an accurate SPF tree?
  • routing table
  • adjacency table
  • link-state database
  • neighbor table
  • topology database
14. Which two routing protocols use Dijkstra’s shortest path first algorithm? (Choose two.)
  • RIPv1
  • RIPv2
  • IS-IS
  • BGP
  • EIGRP
  • OSPF
15. When are link-state packets sent to neighbors?
  • every 30 seconds
  • every 180 seconds
  • after the holddown time expires
  • when a link goes up or down
  • when a routing loop occurs
16.Refer to the exhibit. What does JAX do with link-state packets from ORL?
  • sends out its updated routing table to both ORL and BOS routers
  • sends out the individual link-state packets out the interface connected to BOS
  • queries BOS to see if it has a better route
  • only adds it to the local routing table and performs no other actions
17. A new network administrator is given the task of selecting an appropriate dynamic routing protocol for a software development company. The company has over 100 routers, uses CIDR and VLSM, requires fast convergence, and uses both Cisco and non-Cisco equipment. Which routing protocol is appropriate for this company?
  • RIP version 2
  • IGRP
  • EIGRP
  • OSPF
  • BGP
18. What action does a link-state router take immediately upon receipt of an LSP from a neighboring router?
  • floods the LSP to neighbors
  • calculates the SPF algorithm
  • runs the Bellman-Ford algorithm
  • computes the best path to the destination network
19.Refer to the exhibit. If all routers and interfaces are configured to use a link-state routing protocol, from which routers will router D receive hello packets?
  • A and E
  • B and C
  • A, B, C, and E
  • C only