Trắc nghiệm về công nghệ thông tin 2

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Trắc nghiệm về công nghệ thông tin 2

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  1. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Take Assessment - ERouting Final Exam - CCNA Exploration: Routing Protocols and Concepts (Version 4.0) 00:54:12 Time Remaining: 1 Refer to the exhibit. A network administrator is troubleshooting the OSPF network. The 10.10.0.0/16 network is not showing up in the routing table of Router1. What is the probable cause of this problem? The serial interface on Router2 is down. The OSPF process is not running on Router2. 1
  2. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk The OSPF process is configured incorrectly on Router1. There is an incorrect wildcard mask statement for network 10.10.0.0/16 on Router2. 2 Which of the following could describe the devices labeled "?" in the graphic? (Choose three.) DCE CSU/DSU LAN switch modem hub 3 Using default settings, what is the next step in the router boot sequence after the IOS loads from flash? Perform the POST routine. Search for a backup IOS in ROM. Load the bootstrap program from ROM. Load the running-config file from RAM. Locate and load the startup-config file from NVRAM. 4 2
  3. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Refer to the exhibit. What are two of the routes added to the routing table of R1? (Choose two.) R 172.16.1.0/24 [120/1] via 192.168.3.0, 00:00:24, Serial0/0/0 R 192.168.1.0/24 [120/1] via 172.16.2.1, 00:00:24, Serial0/0/1 R 192.168.9.0/24 [120/1] via 172.16.1.2, 00:00:24, Serial0/0/0 R 192.168.100.0/24 [120/1] via 172.16.1.1, 00:00:24, Serial0/0/0 R 192.168.2.0/24 [120/1] via 172.16.1.2, 00:00:24, Serial0/0/0 5 Which statement is true regarding routing metrics? All routing protocols use the same metrics. EIGRP uses bandwidth as its only metric. Routers compare metrics to determine the best route. The larger metric generally represents the better path. 3
  4. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk 6 Refer to the exhibit. Routers R1 and R3 use different routing protocols with default administrative distance values. All devices are properly configured and the destination network is advertised by both protocols. Which path will be used to transmit the data packets between PC1 and PC2? The packets will travel via R2-R1. The packets will travel via R2-R3. The traffic will be load-balanced between two paths — via R2-R1 and via R2-R3. The packets will travel via R2-R3, and the other path via R2-R1 will be retained as the backup path. 4
  5. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk 7 Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Router2 in order to put the interface in the same network as the serial interface of Router1? IP 172.16.0.18, subnet mask 255.255.255.0 IP 172.16.32.15, subnet mask 255.255.255.240 IP 172.16.0.18, subnet mask 255.255.255.252 IP 172.16.32.18, subnet mask 255.255.255.252 8Which two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.) authentication link-state advertisements hold-down timers Spanning Tree Protocol split horizon 9 A network administrator is in charge of two separate networks that share a single building. What device will be required to connect the two networks and add a common connection to the Internet that can be shared? hub router access point 5
  6. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Ethernet switch 10 Refer to the exhibit. Which host has a combination of IP address and subnet mask on the same network as Fa0/0 of Router1? host A host B host C host D Showing 1 of 6 Page: Close Window All contents copyright 1992-2009 Cisco Systems, Inc. Privacy Statement and Trademarks. 6
  7. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Take Assessment - ERouting Final Exam - CCNA Exploration: Routing Protocols and Concepts (Version 4.0) 00:47:29 Time Remaining: 11 A company is using static routes that are configured with an administrative distance of “1” on all routers in the network. The network administrator decides to introduce a dynamic routing protocol to reduce the manual configurations for the static routes. Which option identifies the correct procedure for the dynamic routing to take place in the network? The static routes and the dynamic routes will have the traffic alternate between them. The static routes will be automatically removed once the dynamic routing is configured. The static routes will be automatically updated with the next hop IP address once the dynamic routing is configured. The static routes must be manually removed from all routers in order for the dynamic routes to be installed in the routing table. 12 Refer to the exhibit. What happens to a packet that has 172.16.0.0/16 as the best match in the routing table that is shown? The packet is discarded. The packet is flooded out all interfaces. 7
  8. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk The packet is forwarded via Serial0/0/0. The packet is forwarded via FastEthernet0/0. 13 The network shown in the diagram is having problems routing traffic. It is suspected that the problem is with the addressing scheme. What is the problem with the addressing used in the topology? The address assigned to the Ethernet0 interface of Router1 is a broadcast address for that subnetwork. The subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3. The subnetwork assigned to the Serial0 interface of Router1 is on a different subnetwork from the address for Serial0 of Router2. The subnetwork assigned to Ethernet0 of Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3. 14 Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the network. Which set of commands is required to configure a single area OSPF for the networks that are connected to R2? 8
  9. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk R2(config)# router ospf 1 R2(config-router)# network 192.168.2.0 0.0.0.255 area 0 R2(config-router)# network 10.1.1.0 0.0.0.3 area 0 R2(config)# router ospf 1 R2(config-router)# network 192.168.2.0 0.0.0.255 area 0 R2(config)# router ospf 2 R2(config-router)# network 10.1.1.0 0.0.0.3 area 0 R2(config)# router ospf 1 R2(config-router)# network 192.168.2.0 0.0.0.255 area 0 R2(config-router)# network 10.1.1.0 0.0.0.3 area 1 R2(config)# router ospf 1 R2(config-router)# network 192.168.2.0 0.0.0.255 area 0 R2(config-router)# network 10.0.0.0 0.0.0.3 area 1 15 A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A? A(config)# router rip A(config-router)# passive-interface S0/0 B(config)# router rip B(config-router)# network 192.168.25.48 B(config-router)# network 192.168.25.64 A(config)# router rip A(config-router)# no network 192.168.25.32 9
  10. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk B(config)# router rip B(config-router)# passive-interface S0/0 A(config)# no router rip 16The command ip route 192.168.2.0 255.255.255.0 172.16.2.2 was entered into the router. After network changes were made, the new next hop for the 192.168.2.0/24 network is 172.16.5.1. What should an administrator do so that the router will use the new next hop to reach the 192.168.2.0 network? Enter the command clear ip route *. Lower the administrative distance for the new path to ensure that it is used first. Negate the original command and enter a new static route with the new next hop. Nothing. The router will learn of the new next hop and automatically update the route table. 17 Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that interface FastEthernet0/1 is not functioning. Which action will most likely correct the problem with FastEthernet0/1? A clock rate should be added to the interface configuration. The subnet mask should be added to the interface configuration. An interface description needs to be added to the interface configuration. The no shutdown command needs to be added to the interface configuration. 18 10
  11. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Refer to the exhibit. Which route will be removed from the routing table if manual EIGRP summarization is disabled the Serial0/0/0 interface of R3? 0.0.0.0/0 172.16.0.0/16 172.16.1.0/24 172.16.3.0/30 19 11
  12. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Refer to the exhibit. Which two statements are true based on the exhibited output? (Choose two.) All routes are stable. Each route has one feasible successor. The serial interface between the two routers is down. The administrative distance of EIGRP has been set to 50. The show ip eigrp topology command has been run on R1. 20You have been asked to explain converged networks to a trainee. How would you accurately describe a converged network? A network is converged when all routers have formed an adjacency. A network is converged immediately after a topology change has occurred. A network is converged when all routers flush the unreachable networks from their routing tables. A network is converged after all routers share the same information, calculate best paths, and update their routing tables. 12
  13. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Showing 2 of 6 Page: Take Assessment - ERouting Final Exam - CCNA Exploration: Routing Protocols and Concepts (Version 4.0) 00:28:33 Time Remaining: 21 Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.) 10.0.0.0/8 64.100.0.0/16 128.107.0.0/16 13
  14. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk 172.16.40.0/24 192.168.1.0/24 192.168.2.0/24 22 Refer to the exhibit. If the router loopback interfaces, FastEthernet interfaces, and OSPF priorities are configured as shown, which router would win an OSPF DR election? A B C D 23 What happens if an EIGRP network path fails and DUAL cannot locate a suitable successor? Routing cannot continue because there is no path to that network. 14
  15. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk The backup table will be searched. DUAL will put the router into the active state. All packets going to that network will be routed to the default gateway instead. All packets going to that network will be dropped. 24 Refer to the exhibit. A network administrator adds this command to router R1: ip route 192.168.2.0 255.255.255.0 S0/0/0. What is the result of adding this command? This route is automatically propagated throughout the network. The traffic for network 172.16.1.0 is forwarded to network 192.168.2.0. A static route is established. The traffic for all Class C networks is forwarded to 172.16.1.2. 25 15
  16. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Refer to the exhibit. Hosts on the BOS Fa0/0 LAN are able to ping the Fa0/1 interface on the JAX router and all interfaces on the BOS and ORL routers. Why would hosts from the 10.0.0.0/24 network not be able to ping hosts on the Fa0/0 LAN of the JAX router? The JAX router has the wrong process ID. The JAX router needs the network 10.0.0.0 0.0.0.255 area 0 command. The JAX router needs the network 192.168.3.0 0.0.0.255 area 0 command. The BOS router needs the network 192.168.3.0 0.0.0.255 area 0 command. 26 Refer to the exhibit. The network administrator has run the following command on R1. R1# ip route 192.168.2.0 255.255.255.0 172.16.1.2 16
  17. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk What is the result of running this command? Traffic for network 192.168.2.0 is forwarded to 172.16.1.2. This route is automatically propagated throughout the entire network. Traffic for all networks is forwarded to 172.16.1.2. The command invokes a dynamic routing protocol for 192.168.2.0. 27 Refer to the exhibit. Routers 1 and 2 are directly connected over a serial link. Pings are failing between the two routers. What change by the administrator will correct the problem? Set the encapsulation on both routers to PPP. Decrease the bandwidth on Serial 0/1/0 on router 2 to 1544. Change the cable that connects the routers to a crossover cable. Change the IP address on Serial 0/1/0 on router 2 to 192.168.0.1/30. 28The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table? C 172.16.1.0 is directly connected, Serial0/0 S 172.16.1.0 is directly connected, Serial0/0 17
  18. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk C 172.16.1.0 [1/0] via 172.16.2.2 S 172.16.1.0 [1/0] via 172.16.2.2 29 What is the function of the OSPF LSU packet? used to confirm receipt of certain types of OSPF packets used to establish and maintain adjacency with other OSPF routers used to request more information about any entry in the BDR used to announce new OSPF information and to reply to certain types of requests 30 Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this? The IP address of host A is incorrect. The default gateway of host A is incorrect. The Fa0/1 interfaces of the two routers are configured for different subnets. The subnet mask for the Fa0/0 interface of R1 is incorrect. 18
  19. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk Showing 3 of 6 Page: Take Assessment - ERouting Final Exam - CCNA Exploration: Routing Protocols and Concepts (Version 4.0) 00:27:53 Time Remaining: 31 What does RIP use to reduce convergence time in a larger network? It uses multicast instead of broadcast to send routing updates. It reduces the update timer to 15 seconds if there are more than 10 routes. It uses triggered updates to announce network changes if they happen in between the periodic updates. It uses random pings to detect if a pathway is down and therefore is preemptive on finding networks that are down. 32If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from where will the router try to load the IOS image first? ROM RAM NVRAM flash TFTP server 19
  20. Shared by www.ccna4u.org www.ccna4u.net www.ccna4u.info www.ccna4u.tk 33 Which routing protocol maintains a topology table separate from the routing table? IGRP RIPv1 RIPv2 EIGRP 34Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a router? (Choose three.) The router modifies the TTL field, decrementing it by one. The router changes the source IP to the IP of the exit interface. The router maintains the same source and destination IP. The router changes the source physical address to the physical address of the exit interface. The router changes the destination IP to the IP of the exit interface. The router sends the packet out all other interfaces, besides the one it entered the router on. 35 Two routers need to be configured within a single OSPF area. Which two components need to be configured on both routers to achieve this? (Choose two.) the same process ID the same area ID network addresses and wildcard masks the same router ID the same loop back address 36Which prompt is used to allow a user to change the IP address of an interface on a router? Router> Router# Router(config)# 20
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