Đề thi chứng chỉ quốc tế CCNA – Show Command Questions

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Đề thi chứng chỉ quốc tế CCNA – Show Command QuestionsCCNA – Show Command QuestionsHere you will find answers to Basic Command QuestionsQuestion 1Refer to the exhibit. What can be determined from the output?A. 192.168.1.2 is local to the router.B. 192.168.3.1 is local to the router.C. 192.168.1.2 will age out in less than 1 minute.D. 192.168.3.1 has aged out and is marked for deletion.Answer: BExplanationThe “Age” field in the “show ip arp” command is the age in minutes of the cache entry.A hyphen (-) means the address is local so in this case 192.168.1.1 & 192.168.3.1 arelocal to this router -> B is correct.Note: The “Age 0″ means that the address was cached less than 1 minute ago.Question 2Refer to the exhibit. What could be possible causes for the “Serial0/0 is down” interfacestatus? (Choose two)A. A Layer 1 problem exists.B. The bandwidth is set too low.C. A protocol mismatch exists.D. An incorrect cable is being used.E. There is an incorrect IP address on the Serial 0/0 interface.Answer: A DExplanationThe first part of the “Serial0/0 is down, line protocol is down” indicates a layer 1 problemwhile the second part indicates a layer 2 problem -> A is correct.Some popular layer 1 problems are listed below:+ device power off+ device power unplugged+ loose network cable connection+ incorrect cable type+ faulty network cableAnswer B “The bandwidth is set too low” will not make a layer 1 problem.Answer C is a layer 2 problem.Answer E is a layer 3 problem.Question 3Which line from the output of the show ip interface command indicates a layer 1problem?A. Serial0/1 is up, line protocol is downB. Serial0/1 is down, line protocol is downC. Serial0/1 is up, line protocol is upD. Serial0/1 is administratively down, line protocol is downAnswer: BExplanationSame as question 2.Question 4Refer to the exhibit. What is the meaning of the output MTU 1500 bytes?A. The maximum number of bytes that can traverse this interface per second is 1500.B. The minimum segment size that can traverse this interface is 1500 bytes.C. The maximum segment size that can traverse this interface is 1500 bytes.D. The minimum packet size that can traverse this interface is 1500 bytes.E. The maximum packet size that can traverse this interface is 1500 bytes.F. The maximum frame size that can traverse this interface is 1500 bytes.Answer: EExplanationThe Maximum Transmission Unit (MTU) defines the maximum Layer 3 packet (in bytes)that the layer can pass onwards.Question 5The network administrator normally establishes a Telnet session with the switch fromhost A. The administrator’s attempt to establish a connect via Telnet to the switch fromhost B fails, but pings from host B to other two hosts are successful. What is the issue forthis problem?A. Host B and the switch need to be in the same subnet.B. The switch needs an appropriate default gateway assigned.C. The switch interface connected to the router is down.D. Host B need to be assigned an IP address in vlan 1.Answer: BExplanationHost A (172.19.1.1) and the management IP address of the Switch (172.19.1.250) are inthe same subnet so telnet from host A to the switch can be successful even if a defaultgateway is not set on host A.Although the switch has an IP address in Interface Vlan1 but it does not have a defaultgateway command pointing to the ip address on interface 172.19.1.254 -> B is correct.Question 6Which command displays CPU utilization?A. show protocolsB. show processC. show systemD. show versionAnswer: BExplanationThe “show process” (in fact, the full command is “show processes”) command gives uslots of information about each process but in fact it is not easy to read. Below shows theoutput of this command (some next pages are omitted)A more friendly way to check the CPU utilization is the command “show processes cpuhistory”, in which the total CPU usage on the router over a period of time: one minute,one hour, and 72 hours are clearly shown:+ The Y-axis of the graph is the CPU utilization.+ The X-axis of the graph is the increment within the period displayed in the graphFor example, from the last graph (last 72 hours) we learn that the highest CPU utilizationwithin 72 hours is 37% about six hours ago.Question 7Refer to the exhibit. You are connected to the router as user Mike. Which commandallows you to see output from the OSPF debug command?A. terminal monitorB. show debuggingC. show sessionsD. show ip ospf interfaceAnswer: AExplanationBy default, Cisco IOS does not send log messages to a terminal session over IP likeTelnet, SSH but console connections do have logging feature enabled by default. Todisplay debug command output and system error messages for Telnet or SSH session, usethe “terminal monitor” command in privileged mode. ...