ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 47
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The command "ip default-network" could be used,but not "ip default-route" or "ip default-gateway". IP default-gateway is used onswitches, not routers.QUESTION 415:Static routing needs to be configured on router CK1 . In which situation would theuse of a static route be appropriate?A.
To configure a route to the first Layer 3 device on the network segment.B. To configure a route from an ISP router into a corporate network.C. To configure a route when the administrative distance of the current routing protocolis too low.D. To reach a network is more than 15 hops away.E. To provide access to the Internet for enterprise hosts.F. None of the aboveAnswer: BExplanation:Static routes are special routes that the network administrator manually enters into theActualtests.com - The Power of Knowing640-802router configuration. Stub networks are the ideal candidate for static routes.There is no need to run a routing protocol over the WAN links between an ISP Routerand a corporate network when only a single Internet link exists.QUESTION 416:The Certkiller network is shown below:Based on this information, which of the following will configure a static route onRouter A to network 180.18.30.0/24 with an administrative distance of 90?A. Router(config)# ip route 90 180.18.20.1 255.255.255.0 182.18.20.2B.
Router(config)# ip route 180.18.20.1 255.255.255.0 182.18.30.0 90C. Router(config)# ip route 180.18.30.1 255.255.255.0 182.18.20.1 90D. Router(config)# ip route 90 180.18.30.0 255.255.255.0 182.18.20.2E. Router(config)# ip route 180.18.30.0 255.255.255.0 182.18.20.2 90Answer: EExplanation:Static route entries consist of the destination IP network address, the IP address of thenext hop router, and the metric (hop count) for the route. A static route that points to thenext hop IP address has an Administrative distance of 1.
If the static route points to anoutgoing interface, the static route has the Administrative distance of 0.One common reason to change the administrative distance of a route is when you useStatic Routes to backup and existing IGP route. This is normally used to bring up abackup link when the primary fails. In this example, choice E specifies that to reach theActualtests.com - The Power of Knowing640-802180.18.30.0/24 network, forward this traffic to the router with the next hop IP address of182.18.20.2 (Router B) using an administrative distance of 90.QUESTION 417:The network administrator of the Oregon router adds the following command to therouter configuration: ip route 192.168.12.0 255.255.255.0 172.16.12.1.
What are theresults of adding this command? (Choose two.)Exhibit:A. Traffic for network 192.168.12.0 is forwarded to 172.16.12.1.B. This route is automatically propagated throughout the entire network.C. Traffic for all networks is forwarded to 172.16.12.1.D. Traffic for network 172.16.12.0 is forwarded to the 192.168.12.0 network.E. The command invokes a dynamic routing protocol for 192.168.12.0.F. The command establishes a static route.Answer: A, FExplanation:In order to configure a static route the router has to be in global configuration mode.ip route network prefix mask {address | interface} [distance]network - the destination networkmask - is the subnet mask for that networkaddress - IP address of the next hop routerinterface - or the interface the traffic is to leave bydistance - (optional) the administrative distance of the routeThere are other parameters but these have been removed as they are not relevant to theCCNA exam.Example:ip route 10.0.0.0 255.0.0.0 131.108.3.4 11010.0.0.0 is the destination network.
255.0.0.0 is the subnet mask for that network and131.108.3.4 is the next hop for the router to use. The 110 is the administrative distancewhich we will look at later on.Actualtests.com - The Power of Knowing640-802QUESTION 418:Which of the commands below can you use to configure a default route on routerCK1 ? (Select two answer choices)A. CK1 (config)# ip route 0.0.0.0 0.0.0.0 E0B. CK1 (config)# ip route 0.0.0.0 255.255.255.255 S0C. CK1 (config-interface)# ip route 255.255.255.255 0.0.0.0 192.168.1.21D. CK1 (config)# ip route 0.0.0.0 0.0.0.0 192.168.1.21E. CK1 (config)# ip route 0.0.0.0 192.168.1.21 255.255.255.255F. CK1 # ip default-network 0.0.0.0 192.168.1.21 255.255.255.255Answer: A, DExplanation:There are two ways to specify a default static route.
One is to specify the interface to usefor forwarding packets, like the example inA. The other way is to specify the IP addressof the next hop router, such as the example in D. The ip route 0.0.0.0 0.0.0.0 commanduses the fact that network 0.0.0.0 is used by Cisco IOS software to represent the defaultnetwork.Reference: CCNA ICND Exam Certification Guide By Wendell Odem Pg.524Incorrect Answers:B. All zero's must used for the subnet mask of a default route, not all 1's.C.
The default route is made in global configuration mode.D, E. A subnet mask is not needed after the next hop router is specified.QUESTION 419:Which of the following commands would you use to configure a default route to anydestination NOT found in the routing table of router CK1 ?A. CK1 (config)# ip default-route 0.0.0.0 255.255.255.255 s0B.
CK1 (config)# ip route 0.0.0.0 255.255.255.255 s0C. CK1 (config)# ip default-route 0.0.0.0 0.0.0.0 s0D. CK1 (config)# ip route 0.0.0.0 0.0.0.0 s0E. CK1 (config)# ip route any any e0F. None of the aboveAnswer: DExplanation:Choice D is the correct syntax for configuring a gateway of last resort. Note that anActualtests.com - The Power of Knowing640-802alternative way is to specify the IP address of the next hop router, for example, "ip route0.0.0.0 0.0.0.0 10.1.1.1."QUESTION 420:The topology of the Certkiller network is displayed below, along with the routingtable of the Certkiller 1 router:172.17.22.0 172.31.5.0Changes to the Certkiller network were made, and now users on the Certkiller 3 LANare not able to connect to the Certkiller 4 LAN. Based on the information above,what could be the reason for this?A. The Fast Ethernet interface is disabled.B.
The neighbor relationship table is not updated.C. A static route is configured incorrectly.D. The routing table on Certkiller 1 is not updated.E. IP routing is not enabled.Answer: CExplanation:On the bottom line of the command output for 'show ip route' you can see that there is anasterisk by the letter S. The S stands for static route, and the static route is incorrectlyconfigured.Incorrect Answers:A.
If this were true, then the users on the LAN would be unable to connect to anythingoutside of their own network.B. It appears that only a single static route is being used on the Certkiller 1 router.Neighbors do not need to be established for static routes.D.
The routing table consists of a single static route, which is configured incorrectly. TheActualtests.com - The Power of Knowing640-802routing tables do not become updated dynamically when static routes are used.E. This is not true, as a static route has been configured.QUESTION 421:Some of the Certkiller routers have been configured with default routes. What aresome of the advantages of using default routes? (Choose two)A. They establish routes that will never go down.B.
The keep routing tables small.C. They require a great deal of CPU power.D. The allow connectivity to remote networks that are not in the routing table.E. They direct traffic from the Internet into corporate networks.Answer: B, DExplanation:Routers use default routing as a last resort when all other methods (directly connected,static, or dynamic) have been exhausted.
For stub networks, a single default static routecould be used to provide connectivity to the entire network. This is desirable for stubnetworks where only a single link connects the remote location to the rest of thenetworks. Because all of the traffic only has one link to use, a single default route willmake the routing table as small as possible, while providing for connectivity to networksnot in the routing table, since as traffic destined for the Internet.Incorrect Answers:A. Although default routes are normally statically assigned, these routes can still godown. If the interface used as the default route should go down, or the next hop IPaddress of the default route become unreachable, the static default route will go down.C.
Using static routes, including default routes, is the least CPU-intensive method ofrouting.E. To influence the way incoming traffic from the Internet gets to a corporation, BGProuting would be used, not default routing.QUESTION 422:You have just configured a static default route on router CK1 . What is the purposeof a default route?A.
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