Exam 10 Troubleshooting
You are troubleshooting a wireless connectivity issue in a small office. You determine that the 2.4 GHz cordless phones used in the office are interfering with the wireless network transmissions. If the cordless phones are causing the interference, which of the following wireless standards could the network be using?
- 802.11b - Bluetooth
After installing a new 2.4 GHz cordless phone system in your office, you notice that wireless network performance is adversely affected. Which of the following wireless networking standards are you most likely to be using?
- 802.11g - 802.11b
You're responsible for implementing network cabling in a new network installation. The cabling will be installed in a manufacturing environment where there is a great deal of electromagnetic interference. Which type of cabling would operate best in this environment?
- Fiber-optic cabling - Shielded twisted pair cable
Which of the following tests can be performed by a TDR?
- Measure the length of a cable - Identify the location of a fault on a cable
After installing a new DHCP server on the network, you need to verify that network devices are receiving IP addressing via DHCP. You reboot a Windows XP client system and using the ipconfig command, receive the following information: Which of the following statements are true?
- The client system is unable to reach the DHCP server - The client system is configured to use DHCP
You are troubleshooting a network connectivity issue on a Unix system. You are able to connect to remote system by using their IP address, but unable to connect using the hostname. You check the TCP/IP configuration, and note that a DNS server IP address is configured. You decide to run some manual resolution queries to ensure that the communication between the Unix system and the DNS server are working correctly. Which utilities can you use to do this?
- dig - nslookup
You want to be able to view the DNS server address that a computer is using. Which of the following utilities would you use?
- ifconfig - ipconfig
Consider the following output from a dig command run on a Linux system. What is the IP address of the DNS server that performed this name resolution?
202.64.49.150
Select the statement that best describes a broadcast storm
A broadcast storm occurs when there are so many broadcast messages on the network that they approach or exceed the network bandwidth
You have a network connected using physical star topology. One of the drop cables connecting a workstation is removed. Which of the following best describes what happens to network communications?
All devices except the device connected with the drop cable will be able to communicate
During a network infrastructure upgrade, you have replaced two 10 Mbps hubs with switches and upgraded from Category 3 UTP cable to Category 5e. During the process, you accidentally cut the Cat 5e patch cable that stretches from the network printer to the upgraded switch. What is the impact on the network?
All network nodes, with the exception of the printer, will be available
You are creating an Ethernet network for your company. The shipping department is located in a different building that is located 150 meters from the main wiring closet. You connect a single Cat6e cable to connect the wiring closet to the shipping building. Which of the following conditions are you most likely to experience?
Attenuation
The phone line to one office is not working. You have identified the location of the phone line in a 66 block in the wiring closet. Which tool would you use to connect to the phone line at the punchdown block to see if you can make and receive calls?
Butt set
You manage a network that uses 1000BaseT Ethernet. You find that one device communicates on the network at only 100 Mbps. Which tool should you use to test the drop cable and the connection to the network?
Certifier
You manage a network with a single switch. On each switch port, a hub connects multiple devices to the switch. Which condition are you most likely to experience on the network?
Collisions
You want to create a loopback plug using a single RJ-45 connector. How should you connect the wires in the connector?
Connect pin 1 to pin 3 and pin 2 to pin 6
A user reports that she can't connect to the Internet. After some investigation, you find that the wireless router has been misconfigured. You are responsible for managing and maintaining the wireless access point. What should you do next?
Create an action plan
You have decided to implement Gigabit Ethernet on your network. Each switch port is connected to a single device. Following the installation, you find one device connected to a switch that is only running at 100 Mbps. Which of the following are likely causes?
Crosstalk
You have just connected a new computer to your network. The network uses static IP addressing. You find that the computer can communicate with hosts on the same subnet, but not with hosts on a different subnet. No other computers are having this problem. Which of the configuration values would you most likely need to change?
Default gateway
Users report that the network is down. After some investigation, you determine that a specific router is configured such that a routing loop exists. What should you do next?
Determine if the escalation is needed
A user reports that she can't connect to a server on your network. You check the problem and find out that all the users are having the same problem. What should you do next?
Determine what has changed
You have a network connected using a full physical mesh topology. The link between device A and device B is broken. Which of the following best describes what happens to network communications?
Device A will be able to communicate with all other devices
A user reports that network access from her workstation is very slow. The problem does not seem to be affecting any other users. Which of the following condition is the most likely cause?
Duplex mismatch
You are troubleshooting a client connectivity problem on an Ethernet network. The client system has intermittent connectivity to the network. You discover that the UTP patch cable is run 75 feet from the wall outlet, passes through the ceiling and over several fluorescent light fixtures before reaching the client system. Which of the following may be the cause of the connectivity problem?
EMI Interference
You have a cable Internet connection at home. The installer had connected the router near the outside wall of your house with RG-6 cable. You move the cable router a distance of 50 meters using RG-8 cables and special connector adapters. Which condition are you most likely to experience?
Echo
You have configured a remote access server to accept dial-up connections for remote access clients. Remote clients are able to connect successfully and access resources on the remote access server. However, the remote clients are not able to connect to the other devices located on the same subnet where the remote access server is located. Which action would likely correct the problem?
Enable proxy arp on the LAN connection for the remote access server
You manage a network with multiple switches. You find that your switches are experiencing heavy broadcast storms. Which of the following will help reduce the effects of a broadcast storm?
Enable spanning tree on the switches
You are a network administrator for your company. A frantic user calls you one morning exclaiming that "nothing is working." What should you do next in your troubleshooting strategy?
Establish the symptoms
You have just connected four new computer system to an Ethernet switch using spare patch cables. After the installation only three systems are able to access the network. You verify all client network settings and replace the network card in the failed system. The client is still unable to access the network. Which of the following might you suspect as the real cause of the problem?
Failed patch cable
You are moving a client to a new location within an Ethernet network. Previous to the move, the client system did not have difficulty accessing the network. During the relocation, you attach a patch cable from the client system to the wall jack and from the patch panel to the switch. Once connected you do not get a link light on the network card or the switch. You swap out the cable running between the patch panel and the switch with a known working one but you can still not connect. Which of the following might you suspect as the problem?
Failed patch cable between the client system and the wall jack
Upon conducting a visual inspection of the server room, you see that a switch displays LED collision lights that are continually lit. You check the LED on the corresponding workstation and see that it is flashing rapidly even though it is not sending or receiving network traffic at that time. What is the cause of the network collisions?
Faulty network card
A router periodically goes offline. Once it goes offline, you find that a simple reboot puts the router back online. After doing some research you find that the most likely cause of the problem is a bug in the router software. A new patch is available from the manufacturer that is supposed to eliminate the problem. What should you do next?
Identify possible effects of the solution
A user reports that he can't connect to a specific Web site. You go to the user's computer and reproduce the problem. What should you do next?
Identify the affected areas of the network
A user is unable to connect to the network. You investigate the problem and determine that the network adapter is defective. You replace the network adapter and verify that it works. What should you do next?
Identify the results and effects of the solution
A user reports that he can't browse to a specific Web site on the Internet. From his computer, you find that a ping test to the Web server succeeds. A trace route test shows 17 hops to the destination Web server. What is the most likely cause of the problem?
Incorrect DNS server address
You manage a local area network with several switches. A new employee has started today so you connect her workstation to a switch port. After connecting the workstation, you find that the workstation cannot get an IP address from the DHCP server. You check the link and status lights and the connection is working properly. A ping to the loopback address on the workstation succeeds. No other computers seem to have the problem. Which of the following is the most likely cause of the problem?
Incorrect VLAN assignment
You manage a network that has multiple internal subnets. You connect a workstation to the 192.168.1.0/24 subnet. This workstation can communicate with some hosts on the private network, but not with other hosts. You run ipconfig/all and see the following: What is the most likely cause of the problem?
Incorrect subnet mask/IP address/default gateway (3 diff questions)
You are troubleshooting an IP addressing issue, and so issue a command to view the TCP/IP configuration of the system. The command you use produces the following output: Which of the following operating systems are you working on?
Linux {the rest are Windows options}
You have decided to conduct a business meeting at a local coffee shop. The coffee shop you chose has a wireless hotspot for its customers who want Internet access. You decide to check your e-mail before the meeting begins, but when you open the browser you cannot gain Internet access. Other customers are on the Internet and because you use a wireless connection at work, you are sure your laptops wireless adapter works. What is the likely cause of the problem?
Mismatched SSID
You manage a network with multiple subnets connected to the Internet. A user reports that she can't access the Internet. You investigate the problem and find that she can access all hosts on the private network, but no hosts on the Internet. Which of the following is likely the cause of the problem?
Missing default route on a router
You manage a network with multiple subnets connected to the Internet. A user reports that she can't access the new server used in the accounting department. You check the problem and find out that her computer cannot access any server on that subnet, however the computer does access other computers on other subnets as well as the Internet. Which of the following is most likely the cause of the problem?
Missing route on the default gateway router
You want to measure the voltage, amps, and ohms of various devices. Which tool should you use?
Multimeter
Which of the following best describes the condition where a signal sent on one wire is received on another wire within the same connector?
NEXT
You have a network connected using a physical bus topology. One of the cables connecting a workstation to the bus breaks. Which of the following best describes what happens to network communications?
No devices will be able to communicate
You are working with an existing fiber optic installation in your building. You want to know how long each length of cable is that runs through walls. Which tool should you use?
OTDR
You are setting up a wireless hotspot in a local coffee shop. For best results, you want to disperse the radio signals evenly throughout the coffee shop. Which of the following types of antennas would you use on the AP to provide a 360-degree dispersed wave pattern?
Omni-directional
You have been hired to troubleshoot a wireless connectivity issue for two separate networks located within a close proximity. Both networks use a WAP from the same manufacturer and all settings, with the exception of SSIDs, remain configured to the default. Which of the following might you suspect as the cause of the connectivity problems?
Overlapping channels
Which of the following recommendations should you follow when placing access points to provide wireless access for users within your company building?
Place access points above where most clients are
CorpServ is a small company with 14 client systems and a network printer. Because there are only a limited number of networked system, you decide to use APIPA addressing for the network. With APIPA configured, all systems are able to communicate with each other but you are having trouble configuring Internet access. What is the likely cause of the problem?
Private addresses cannot directly communicate to hosts outside the local subnet
You are creating an Ethernet network for your company. The shipping department is located in a different building that is located 150 meters from the main wiring closet. You connect a single Cat6e cable to connect the wiring closet to the shipping building. Which of the following should you include in your plan?
Repeater
You are implementing a wireless network inside a local office. You require a wireless link to connect a laptop in the administrator's office directly to a system in the sales department. In the default configuration, the wireless AP uses a 360-dispersed RF wave design. After installed, the signal between the two systems is weak as many obstacles interfere with the signal. Which of the following strategies could you try to increase signal strength?
Replace the Omni-directional antenna with a directional antenna
A user from the Sales department calls to report that he is experiencing problems connecting to the Sales file server. All users in the Sales department connect to the Sales server through a single Ethernet switch. No other users have reported problems connecting to the Sales server. Which of the following troubleshooting actions are you most likely to perform first?
Replace the network card in the user's computer
You are troubleshooting access to a server in a remote network. You use the tracert command and see the following: What is the problem?
Routing loop
You use Cat5e twisted pair cable on your network. Cables are routed through walls and the ceiling. A user puts a screw in the wall to hang a picture and pierces the cable such that a signal sent on pin 1 arrives on the cable connected to pin 7. What term describes this condition?
Short circuit
Users report that the Internet is no longer accessible. You suspect that the line connecting your building to the Internet is not working properly. Which of the following allows the service provider to remotely test the local loop?
Smart jack
Which of the following solutions would you implement to eliminate switching loops?
Spanning tree
You have been asked to document the wiring in your building. You would like to identify the length of each Cat5 cable to verify that it meets Ethernet standards. You need to identify the length of the cables, but most cables run through walls and ceilings, making them difficult to trace. What tool should you use?
TDR
You are a network administrator for your company. A user calls and tells you that after stepping on the network cable in her office, that she can no longer access the network. You go to the office and see that one of the user's stiletto heels has broken and exposed some of the wires in the Cat 5 network cable. You make another cable and attach it from the wall plate to the user's computer. What should you do next in your troubleshooting strategy?
Test the solution
A user on your network has been moved to another office down the hall. After the move she calls you complaining that she has only occasional network access through her wireless connection. Which of the following is most likely the cause of the problem?
The client system has moved too far away from the access point
Due to widespread network expansion, you have decided to upgrade the network by configuring a DHCP server for the network. The network uses Linux, Windows, and Mac OS X client systems. You configure the server to distribute IP addresses from 192.168.2.1 to address 192.168.2.100. You use the subnet mask of 255.255.255.0. After making all setting changes on the DHCP server, you reboot each client system but they are not able to obtain an IP address from the DHCP server. Which of the following would explain the failure?
The clients must be configured to obtain IP addressing from a DHCP server
A user calls to report that she is experiencing intermittent problems while accessing the wireless network from her computer. While talking to her, you discover that she is trying to work from the coffee room two floors above the floor where she normally works. What is the most likely cause of her connectivity problem?
The user is out of the effective range of the wireless access point on her floor
Your organization uses an 802.11b wireless network. Recently, other tenants installed the following equipment in your building: (5 points). Since this equipment was installed, your wireless network has been experiencing significant interference. Which system is to blame?
The wireless TV system
You administer a network with Windows 2000 and UNIX servers, and Windows 2000 Professional, Windows 98, and Macintosh clients. A use of a Windows 98 computer calls you one day and says he is unable to access resources on the network. You type ipconfig on the user's computer and receive the following output: You also check your NIC and see the link light on. What might the problem be?
Unavailable DHCP server
While configuring a new 802.11g wireless network, you discover another wireless network within range that uses the same channel ID that you intend to use. Which of the following strategies are you most likely to adopt in order to avoid a conflict between the networks?
Use a different Channel ID
You are troubleshooting a connectivity problem in which one client system is unable to connect to a server. Both the server and client system are connected to the same Ethernet network switch. No other users have complained of a problem, and you suspect that faulty network cabling might be to blame. Which of the following troubleshooting steps are you most likely to perform first?
Use a media tester to test the cable between the computer system and the network switch
You have just been hired as a network administrator. A user has just changed offices and needs you to activate the network and telephone connections in his office. However, the wiring at the punch down block is labeled poorly and you are unable to tell which wires go to the user's office. What should you do?
Use a tone generator to locate the correct wiring
You are implementing a DHCP server for your segment. Your segment's IP address is 192.168.1.0. Your default gateway address is 192.168.1.254. Your DNS server address is 192.168.1.1. Your default gateway is configured as a NAT router to translate addresses between network segments. You configured the 03 Router option on your DHCP server so it can deliver the IP address of the default gateway to workstations. After configuring your workstations to get their IP addressing information dynamically, your users complain that they are unable to access web sites on the Internet. How can you resolve this problem?
You must configure your DHCP server with an option that delivers the IP address of the DNS server (Option 06)
You're trying to access your office network with your Windows XP workstation from home using your organization's virtual private network (VPN). Your modem has dialed and connected to your ISP, but you can't connect to your office network. You issue the ipconfig command from the shell prompt and learn that your system has been assigned an IP address of 169.254.1.12. What's causing the problem?
Your ISP's DHCP server isn't working properly
Which of the following tools would you use to view the MAC address associated with IP addresses that the local workstation has contacted recently?
arp
You are troubleshooting a connectivity problem on a Linux server. You are able to connect to another system on the local network, but are not able to connect to a server on a remote network. You suspect that the default gateway for the system may be configured incorrectly. Which of the following commands would you use to view the default gateway information on the Linux server?
ifconfig
You work in an office that uses Linux servers, Netware servers, and Windows NT 4.0 servers. The network uses both the TCP/IP and IPX/SPX protocols. The Linux server is used as an FTP server. Today you have received several calls from people who are unable to contact the Linux server at its known IP address. You are sitting at the Linux server and want to check its IP address. Which command should you use?
ifconfig
You have been called in to troubleshoot a connectivity problem on a newly installed Windows Server 2003 system. The system is operating satisfactorily and is able to communicate with other systems on the local network. However it is unable to access any systems on other segments of the corporate network. You suspect that the default gateway parameter for the system has not been configured, or may be configured incorrectly. Which of the following utilities are you most likely to use to view the default gateway information for the system?
ipconfig
You administer a NetBIOS-based network that uses the TCP/IP protocol. You are trying to troubleshoot a computer that is unable to contact a server by its NetBIOS name. Which command can you use to check the connection?
nbtstat
Your computer is sharing information with a remote computer using the TCP/IP protocol. Suddenly, the connection stops working and appears to hang. Which commands can you use to check the connection?
netstat
Which command displays network activity statistics for TCP, UDP, and UP?
netstat -a
Mary calls to tell you that she can't connect to an intranet server called WebSrv1. From her computer, you ping the server's IP address. The ping test is successful. Which tool would you use on her workstation next to troubleshoot the problem?
nslookup
You work in an office that uses NetWare servers and Windows NT 4.0 servers. The network uses both the TCP/IP and IPX/SPX protocols. You are sitting at a workstation that uses Windows 95 OSR2. An application you are using is unable to contact a Windows NT server named FileSrv2. Which command can you use to determine whether your computer can still contact the server?
ping
Which of the following utilities would you use to view the routing table?
route
While working on a Linux server, you are unable to connect to Windows Server 2003 system across the Internet. You are able to ping the default gateway on your network, so you suspect that the problem lies outside of the local network. Which utility would you use to track the route to a packet as it crosses the network?
traceroute
You are the network administrator of a branch office of your company. The branch office network is part of a WAN that covers most of the United States. The office has two Windows 2000 Professional clients, and five Macintosh clients. Users have been complaining that they are unable to access resources over the WAN at the main headquarters. You suspect that one of the routers between your office and the main headquarters is not working properly. What TCP/IP utility can you use to see if a router is not working properly?
tracert