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| A1: | The correct answers are A, C, D, and E. Cisco recommends Physical, Data Link, and Network layer information in the network configuration table. B is incorrect because listing applications running on the device in the configuration table is not a recommendation from Cisco. Answer F is incorrect. Cisco also does not recommend documenting all features of the IOS in use. |
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| A2: | The correct answers are A, B, and E. Flash memory, access lists, and interface names are all excellent ideas for a network configuration table related to troubleshooting. Answers C and D are incorrect. Network applications in use and service pack levels are appropriate for end system configuration tables. |
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| A3: | The correct answers are A, B, C, D, and E. All of the listed components are appropriate for a Cisco network topology diagram. |
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| A4: | The correct answer is B. The show version command allows you to view the name and model of the device, as well as the operating system that the device is running. Answer A is incorrect. Show ip interfaces displays information about IP configurations for each interface running IP on the router. Answer C is incorrect. Show ip interfaces brief provides an excellent summary table of information for each interface, including Layer 3 addresses and status information, but does not provide the information needed here. Answer D is incorrect. Show controllers shows hardware information for each interface but does not show router uptime and IOS information. |
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| A5: | The correct answer is D. The show interfaces command allows you to view MAC address information for each of your Ethernet-based interfaces. Answer A is incorrect. Show ip interfaces brief does not show MAC address information; only Layer 3 address information is displayed. Answer B is incorrect. Show version displays IOS information and router uptime information as well as information regarding the interface hardware in place. Answer C is incorrect. Show mac-address-table is used on a switch in order to show the MAC addresses learned by a switch. |
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| A6: | The correct answers are A, D. In order to view routes that are on the router, you can use the show ip route command. In order to view the routing protocol in use, and the networks that will be advertised, use the show ip protocols command. Answer B is incorrect. The show ip interfaces brief command does provide summary information regarding the interfaces on the device, but it does not indicate what routes are advertised to neighboring devices. Answer C is incorrect. There is no such command as the show route advertise command. |
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| A7: | The correct answers are B, E. In order to view IP address information, you must use the detail keyword with the show cdp neighbors command. You can also use the show cdp entry * command in order to obtain Layer 3 address information. Answer A is incorrect. Show ip protocols provides information about the dynamic routing protocols in use on the device, but it does not provide neighboring Layer 3 address information. Answer C is incorrect. Show spanning-tree summary provides spanning tree configuration information, but again, cannot be used to explore neighboring Layer 3 address information. Finally, show cdp neighbors without the detail switch does not provide Layer 3 address information about the neighboring devices, therefore answer D is incorrect. |
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| A8: | The correct answer is A. The show spanning-tree summary totals command allows you to quickly verify the spanning tree configuration, including enabled features. Answer B is incorrect. The show spanning-tree command does provide excellent information about spanning-tree, but it does not provide the information in a summary fashion as depicted here. Answer C is incorrect. There is no such command as show ip spanning-tree . Answer D is incorrect. show spanning-tree vlan 34 is a valid command, but the command displays detailed spanning-tree information about VLAN 34 only. |
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| A9: | The correct answer is D. The password keyword leaves passwords and other security information in the output. If not used, passwords and other security-sensitive information in the output are replaced with the label " <removed> " (this is the default). Answer A is incorrect. The password keyword does not hide password information from being displayed in the output ”in fact, it causes it to be left in the output. Answer B is incorrect. This keyword also does not encrypt the password information that displays in the output. Answer C is incorrect. The password keyword is a valid parameter. |
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| A10: | The correct answer is A. After logging in to the device, you should discover relevant information about the device ”this includes interface discovery. Answer B is incorrect. You document your findings later in the process, not immediately after login. Answer C is incorrect. Creating the network diagram also takes place later in the process. Finally, the device discovery stage takes place after the current device is completely documented, therefore answer D is incorrect. |
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| A11: | The correct answer is D. ipconfig /all displays IP information for hosts running Windows NT/2000/XP. Answer A is incorrect. Winipcfg does provide IP information for Windows-based end systems, but only systems running 9x or Me editions of Windows. Answers B and C are incorrect. The tracert and arp commands display limited IP information for end systems, and are not the best choices in this case. |
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| A12: | The correct answer is D. Routers map directly to the Network layer of the OSI model. Answers A and C are incorrect. Hubs map to the Physical layer, while switches map the Data Link layer. Answer B is incorrect. End systems typically run applications that encompass all layers of the OSI model. |
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| A13: | The correct answer is A. Hubs map directly to the Physical layer of the OSI model. Answer B is incorrect. Routers map directly to the Network layer of the OSI model. Answer C is incorrect. Switches map to the Data Link layer. Answer D is incorrect. Multilayer switches and routers do interact with the Transport layer, but they are not typically considered Transport layer devices. |
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| A14: | The correct answers are A, C, D, and E. Valid guidelines from Cisco include knowing your objective, maintaining the documentation, keeping it accessible, and using consistent terms and symbols. Answer B is incorrect. You should not document all possible parameters. You should only collect data that is relevant to your objective. |
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| A15: | The correct answer is D. While an end system configuration table will contain different information depending on its usage, you should consider the parameters listed here. "PortFast, Trunk Status, Network Applications, IP Address" contains switch parameters. "IP Address, Subnet Mask, Duplex" describes a router. "IOS Type/Version, STP State, Default Gateway Address, IP Address" also contains parameters that describe a switch. |
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| A16: | The correct answer is D. While a topology diagram for an end system can contain many different components, you should consider MAC Address, Network Applications, and IP addresses when creating the diagram. Answer A is incorrect. "IP Address, Subnet Mask, STP State" is a list that is most appropriate for a multilayer switch. Answer B is incorrect. "Trunk Status, MAC Address, IP Address" is also multilayer switch relevant. Answer C is incorrect. "Duplex, Interface Name, Routing Protocol" are components that apply to routers. |
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| A17: | The answer is B. The ipconfig command, when used with the /all switch, allows you to view all details of the IP configuration on the end system. This includes DHCP-assigned WINS information. Answer A is incorrect. Route print allows you to see all of the routes on a Windows-based end system. Answer C is incorrect. Ping is a diagnostic utility that allows you to test IP connectivity. Answer D is incorrect. There is no show ip wins command available. |
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| A18: | The correct answer is D. You should gather symptoms and then attempt to isolate the problem. Answers A, B, and C are incorrect. Correcting the problem, documenting the solution, and reversing any changes that did not correct the problem are all valid steps, but they do not follow the gathering of symptoms. Answer E is incorrect. Using the show tech command is not part of the guidelines from Cisco. |
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| A19: | The correct answer is D. The Origination phase involves taking data from applications and converting as needed for transmission on the network. Answers A, B, and C are all incorrect. Transport, Terminating, and Forwarding are the other phases. Answer E is incorrect. Transmission is not a valid phase. |
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| A20: | The correct answers are A, D, and E. Firewalls directly relate to the Physical, Data Link, and Network layers, similar to a router. Answer B is incorrect. While they can impact the Transport later, there is not a direct correlation. Answer C is incorrect. They also do not directly correlate to the Application layer. |
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| A21: | The correct answer is D. According to Cisco, you should determine ownership immediately after analyzing the existing symptoms. You always want to ensure that the network issues are in your realm of responsibility. Answers A, B, and D are all incorrect. Narrowing scope, determining symptoms, and documenting symptoms are all valid steps, but they do not immediately follow analyzing existing systems. |
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| A22: | The correct answer is D. A Bottom-Up troubleshooting approach starts with the Physical layer and works up the OSI model. Traceroute and ping are often used initially in this approach to test the first few layers. Answers A and B are incorrect. The other valid approaches Cisco recommends are the Top Down approach and the Divide and Conquer approach. Answer C is incorrect because the Logical Hierarchy model is not valid. |
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| A23: | The correct answer is D. When you apply the Divide and Conquer approach toward troubleshooting, you select a layer and test in both directions from the starting layer. This often enables you to more quickly isolate and repair the problem, especially when compared to other approaches. Answers A and B are incorrect. The other valid approaches Cisco recommends are the Top Down and Bottom Up approaches. Answer C is incorrect as the Logical Hierarchy model is not valid. |
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| A24: | The correct answer is B. Consulting with external experts is not part of three guidelines put forth by Cisco. Answers A, C and D are all incorrect, as the guidelines recommend that you analyze the symptoms, determine the scope of the problem, and apply your experience. |
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| A25: | The correct answer is A. Using the Divide and Conquer approach, you begin your troubleshooting at a suspected layer and move up and down from that layer in the OSI model. Using the Divide and Conquer approach to troubleshooting access list configuration problems, therefore, involves beginning your troubleshooting at the Network layer. Access lists are Network layer components. Answers B, C, and D are incorrect. Access list problems are not considered Physical, Data Link, or Application layer problems. |
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| A26: | The correct answer is C. Interviews with end users are typical in the symptom-gathering step of the process. Answer A is incorrect. Isolating the problem involves gathering and documenting more symptoms. Answer B is incorrect. Correcting the problem involves implementing, testing, and documenting a solution. Answer D is incorrect. Discovering systems is not part of the process. |
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| A27: | The correct answers are A, B, and C. You should always determine the scope of the problem, apply your experience, and analyze the symptoms when you are selecting a troubleshooting approach. Answer D is incorrect. Documenting the problem is not a valid recommendation from Cisco. |
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| A28: | The correct answer is B. Use the show version command to view the router's current configuration register setting. Answers A, C, and D are incorrect. show confreg is not a valid command, nor are show boot and show configuration . |
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| A29: | The correct answers are A, B, C, and D. All of these symptoms are possible when a WAN link is showing intermittent connectivity. |
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| A30: | The correct answer is C. An orange light on a port module indicates that the port has been disabled by the system software. Answer A is incorrect. A hardware failure does not cause this LED to turn orange. Answer B is incorrect as well, since this does not indicate that the diagnostics are running. Finally, answers D and E are also incorrect. An operation port is indicated by a steady green LED and a system boot causes the LEDs to flash. |
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| A31: | The correct answers are B, E. Interface resets appear in the output of the show interface commands and are the result of missed keepalive packets. Answer A is incorrect. The show ip interface command provides parameters particular to IP settings on the interface(s). Answer C is incorrect. There is no show async command. To display the status of activity on all lines configured for asynchronous support, use the show async status privileged EXEC command. Answer D is incorrect as well. There is no such command as the show environment command. |
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| A32: | The correct answer is E. The EXEC command terminal monitor accomplishes the task of displaying the system error messages to a non-console terminal. Answer A is incorrect. logging monitor sets the logging level. Answer B is incorrect. monitor terminal is an invalid command. Answer C is incorrect. Logging on enables logging to all supported destinations. Answer D is incorrect. terminal telnet is for telnet protocol specific configuration. |
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| A33: | The correct answer is A. Beginning with IOS version 11.2, LMI can be auto-sensed by Cisco equipment. Answers B, C, and D are incorrect. Due to the default auto-sensing behavior of Cisco routers running the latest IOSs, the LMI does not have to be set to ansi, q933a, or cisco. |
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| A34: | The correct answer is D. PortFast allows client workstation ports to enter the forwarding state almost immediately. Answer A is incorrect. BackboneFast is a valid spanning-tree enhancement, but it does not directly effect client logins. Answer B is incorrect. UplinkFast is also a valid enhancement, but it does not directly effect client logins. Answer C is incorrect. Cisco never recommends disabling spanning-tree. |
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| A35: | The correct answer is B. The show frame-relay pvc 100 command will display DLCI specific traffic statistics. Use the command without the DLCI number to view statistics for all DLCIs that have been configured. Answers A and C are incorrect. The command show frame-relay dlci 100 is not valid, nor is show frame-relay 100 . Answer D is incorrect. To display information about the status of the internals of Frame Relay Layer 2 (LAPF) if switched virtual circuits (SVCs) are configured, use the show frame-relay lapf EXEC command. |
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| A36: | The correct answer is B. To view which ports are the designated ports use the show spantree command. Answers A, C, and D are incorrect. The only other valid command here is show vtp , yet this command is followed by the status keyword. show vtp status reports on the VTP configuration of a switch. |
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| A37: | The correct answer is E. To verify PPP authentication using either PAP or CHAP, use the debug ppp authentication command. Answer A is incorrect. Show ppp chap is an invalid command. Answer B is incorrect. debug ppp authentication chap is also invalid. Answer C is incorrect. debug ppp chap is a valid command but it does not display authentication specific information. Answer D is incorrect. debug ppp password is an invalid command. |
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| A38: | The correct answer is C. The source address specified in the extended ping command can be any active interface IP address of the local router. Answers A and D are incorrect. The IP address cannot be any IP address from the organization, nor can it be any private address ”the address must be from an active interface on the router. Answer B is also incorrect, as the IP address is not restricted to the ping exit interface. |
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| A39: | The correct answer is C. The clear counters command will clear the counters on all of the interfaces. Adding Ethernet 0/0 at the end of the clear counters command will clear counters for that particular interface only. Answers A, B, and D are incorrect. All other syntax examples listed here will produce an error. |
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| A40: | The correct answer is A. Carrier transitions appear in the output of the show interfaces serial EXEC command whenever there is an interruption in the carrier signal (such as an interface reset at the remote end of a link). Answers B, C, and D are all incorrect. Interface resets, restarts, and line protocol down do not provide an exact indication of an interruption in the carrier signal. Only carrier transitions indicate this. |
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| A41: | The correct answer is C. Use the show version command to view the total uptime for the router. Answer A is incorrect. show uptime is not a valid command. Answer B is incorrect. show system is not a valid command. Answer D is incorrect. To display the reload status on the router, use the show reload EXEC command. |
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| A42: | The correct answer is D. The clock rate command accepts a parameter in bps, and 56000 is the correct way to express 56Kbps in bps. Answers A, B, and C are all incorrect. All other syntax examples here produce an error. |
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| A43: | The correct answer is B. CDP sends and receives packets on Layer 2 multicast address 01-00-0C-CC-CC. Answers A, C, and D are incorrect. Because CDP packets are a Layer 2 multicast, no other option here is correct. |
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| A44: | The correct answer is A. This command will show ISDN end-to-end connectivity status and all three layers of the ISDN connection. Answer B is incorrect. To display general diagnostic information for interfaces configured for DDR (dial-on-demand routing), use the show dialer command in EXEC mode. Answer C is incorrect. To display the information about calls, history, memory, status, and Layer 2 and Layer 3 timers, use the show isdn EXEC command. Answer D is incorrect. Use the debug dialer events privileged EXEC command to display debugging information about the packets received on a dialer interface. Answer E is incorrect. debug isdn is used with additional keywords in order to capture ISDN-specific events. |
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| A45: | The correct answer is C. ip helper-address forwards UDP broadcasts, including BOOTP, received on an interface. Answer A is incorrect. To enable the Cisco IOS Dynamic Host Configuration Protocol (DHCP) server and relay agent features on your router, use the service dhcp global configuration command. Answer B is incorrect. To enable SNMP functionality, “ you may use the snmp-server command with additional keywords. Answer D is incorrect. The command ip forward dhcp is invalid. |
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| A46: | The correct answer is B. The debug telnet command allows you to display events during the negotiation process of a Telnet connection. Answer A is incorrect. The Telnet {ip address} log command is not valid. Answer C is incorrect. The debug telnet events command is not valid. Answer D is incorrect. Telnet {address} details is not valid either. |
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| A47: | The correct answer is B. By default, syslog messages are sent to the console. Answers A, C, and D are all incorrect. Syslog messages are enabled by default and are sent to the console, not to a terminal or a buffer. |
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| A48: | The correct answer is D. The clear ip bgp {as number} command allows you to clear the BGP session. Answers A, B, and C are all incorrect. All other syntax examples listed here produce an error. |
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| A49: | The correct answer is B. The no ip domain lookup command disables DNS-based host name to address translations. Answers A, C, and D are all incorrect. All other syntax examples presented here produce an error. |
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| A50: | The correct answer is A. The show ip access-lists command displays the contents of all access lists configured on the router. Answers B, C, and D are all incorrect. All other syntax examples presented here produce an error. |
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| A51: | The correct answer is C. Once you have made initial configuration changes and documented these changes, you should verify that the problem is solved and ensure that your solution did not introduce other problems. Answer A is incorrect. You should get input from outside resources if you continue to make changes and cannot resolve the problem. Answer B is incorrect. You should document the solution, but this is the last step in the process. Answer D is incorrect. Restoring the original configurations on all devices is not a step in the procedure as defined by Cisco. |
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| A52: | The correct answer is D. You should use the show ip arp command to display the Address Resolution Protocol (ARP) cache to see whether name resolution is working. Answer A is incorrect. show ip hosts allows you to view the static host name to IP address mappings on the device. Answer B is incorrect. show ip route allows you to view the IP forwarding table. Answer C is incorrect. show ip interface allows you to view all parameters surrounding the interface, including error counter information. |
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| A53: | The correct answer is C. A quick method of verifying DNS is to use IP addresses in place of host names when testing for connectivity. If tests pass with IP addresses and not with names, DNS is a potential problem. Answer A is incorrect. Examining the routing table entries is not as efficient as testing connectivity using an IP address. Answer B is incorrect. Examining the router's configuration also is not efficient, and limits your investigation to the local router. Answer D is incorrect. Checking for obsolete address resolution entries is not valid. Answer E is incorrect. Using a ping is a correct method, but the IP address should be specified. |
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| A54: | The correct answer is A. Symptoms that may be present during sub-optimal performance of Data Link layer components includes excessive CRC and FCS errors. Answers B, C, and D are all incorrect. Excessive utilization, an increased number of interface errors, and LEDs in an off indication are symptoms of a Physical layer problem. |
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| A55: | The correct answer is A. Excessive utilization is a possible symptom of a Physical layer problem. Answers B, C, and D are all incorrect. All other symptoms listed are Data Link layer related. |
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| A56: | The correct answer is B. After narrowing the scope, you should use a layered troubleshooting approach to determine symptoms. Answer A is incorrect. You document symptoms after you determine them. Answer C is incorrect. You solve the problem and document the solution as the last step. Answer D is incorrect. Finally, you begin isolating if you cannot solve the problem using the documented symptoms. |
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| A57: | The correct answer is A. The show ip arp command allows you to see mappings between Layer 2 and Layer 3 network addresses. Answer B is incorrect. show ip hosts allows you to view host name to ip address mappings. Answer C is incorrect. show ip routes allows you to view the IP forwarding table. Answer D is incorrect. show ip interface allows you to view IP parameters assigned to interfaces. Answer E is incorrect. show ip addresses is not a valid command. |
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| A58: | The correct answers are A, D. Full-duplex permits greater bandwidth due to the elimination of collisions. Answers B and C are incorrect. Full duplex connections cannot connect to other switches. Full duplex configurations are not limited to a maximum of 16 ports and 8 spanning trees. |
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| A59: | The correct answer is B. You use the show frame-relay map command to view the mapping between the DLCI and a remote Layer 3 address. Answer A is incorrect. show frame-relay is used with additional keywords. Answer C is incorrect. show frame relay dlci is not a valid command. Answer D is incorrect. show frame-relay counters is not a valid command. Answer E is incorrect. show interface [number] dlci is not a valid command. |
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| A60: | The correct answer is C. You use the extended commands option to access these privileged mode ping features. Answers A, B, and D are incorrect. Verbose, protocol options, and IP header commands are all valid privileged mode ping commands, yet none allow access to these features. |
