networking chapter 10

You are a network administrator for your computer. A frantic user calls you one morning exclaiming that “nothing is working.” What should you do next in your troubleshooting strategy?
Establish the symptoms
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 escalation is needed
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 verity that it works.
What should you do next?
Identify the results and effects of the solution
A user reports that she cant connect to a server on your network. You check the problem and find out that all users are having the same problem.
What should you do next?
Determine what has changed
A user reports that she cant connect to the internet. After some investigation, you find 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 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 wiring 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
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 own network, so you suspect the problem lies outside the local network.
Which utility would you use to trace the route a packet takes as it crosses the network?
traceroute
A user reports that he cant 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 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’s 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
You work in an office that uses NetWare servers and Wind. nt 4 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 FileSrvr2. What command can you use to determine whether your computer can still contact the server?
ping
You are troubleshooting a network connectivity issue on a UNIX system. You are able to connect to the 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
Mary calls to tell you that she can’t 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
CorpServ is a small company with 14 client systems and a network printer. Because there are only a limited number of networked systems, 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
Examine the following output:
Server: helicuplar.xct.takro.net
Address: 209.53.4.130
Name: westsim.com
Address: 64.78.193.84

Which of the following utilities produced this output?

nslookup
Consider the following output:
;; res option: init rescuers defnam dnsrch
;;got answer
;;->>HEADER;<<-opcode:QUERY, status; NOERROR, id:4
;;flags: gr rd ra; QUERY:1, ANSWERS:1, AUTHORITY:2, ADDITIONAL:0
;;QUERY SECTION:
;;westsimlll.com, type = A, class = IN

;;ANSWER SECTION;
westsimlll.com. 7h33m IN A 76.141.43.129
;;AUTHORITY SECTION:
westsimlll.com. 7h33m IN NS dns1.deriact111.com.
westsimlll.com. 7h33m IN NS dns2.deriact222.com.
;;Total query time: 78 sec
;;FROM: localhost.localdomain to SERVER: default — 202.64.49.150
;;WHEN: Tue Feb 6 23:21:24 2005
;;MSG SIZE sent: 30 rcvd: 103

Which of the following utilities produced this output?

dig
After installing a new DHCP server on the network, you need to verify that the network devices are receiving IP addresses via DHCP. You reboot a Windows XP client system and using the ipconfig command, receive the following information:
Ethernet adapter Local Area Connection 1:
Description: CardBus-II 10/100 PC Card
Physical Address : 02-00-4C-3F-50
DHCP Enabled : Yes
Auto configuration Enabled : Yes
Auto configuration IP Address : 169.254.25.129
Subnet : 255.255.0.0
Default Gateway:
DNS Servers:

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.
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 that 17 hops to the destination Web server.
What is the most likely cause of the problem?
incorrect DNS server address
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 address 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 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
Which of the following solutions would you implement to eliminate switching loops?
spanning tree
Select the statement that best describes a broadcast storm.
A broadcast storm occurs where there are many broadcast messages on the network that they approach or exceed the network bandwidth.
A user reports that network access from her workstation is very slow. The problem does not seem to be affecting any other ways.
Which of the following conditions is the most likely cause?
duplex mismatch
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 local loopback address on the workstation succeeds. No other computers seem to have a problem.

Which of the following is the most likely cause of the problem?

incorrect VLAN assignment
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 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 US. The office has two Windows 2000 servers, tow UNIX servers, on Windows NT server, 90 Windows 98 clients, 40 Windows 2000 Professional clients, and five Macintosh clients.
Users ahve been complaining that they are unable to access resources over the VAN at the main headquarters. You suspect that one of the routers between your office and the main headquarters is not working proplerly
What TCP/IP utility can you use to see if a router is not working properly?
tracert
you are troubleshooting access to a server in a remote network. You use the tracert command and see the following:
Tracing route to 192.168.2.250
over a maximum of 30 hops
1 2 ms 2 ms 2 ms 192.168.12.11
2 2 ms 2 ms 2 ms 192.168.11.1
3 5 ms 5 ms 3 ms 192.168.10.15
4 2 ms 2 ms 2 ms 192.168.9.1
5 2 ms 2 ms 2 ms 192.168.11.1
6 2ms 2 ms 2 ms 192.168.10.15
7 5ms 5 ms 3 ms 192.168.9.1 routing loop
routing loop
You have 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 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
Which of the following utilities would you use to view the routing table?
route
You manage a network with multiple subnets connected to the Internet.
Missing route on the default gateway router.
Examine the following output:
4 22 ms 21 ms 22 ms sttlawa01gr02.bb.ispxy.com [154.11.10.62]
5 39 ms 39 ms 65 ms plalca01gr00.bb.ispxy.com [154.11.12.11]
6 39 ms 39 ms 39 ms Rwest.placa01gr00.bb.ispxy.com [154.11.3.14]
7 40 ms 39 ms 46 ms svl-core-03.inet.ispoxy.net [205.171.206.29]
8 75 ms 117 ms 63 ms dia-core-01.inet.ispxy.net [205.151.142.1]

Which of the following produced this output?

tracert
You have just connected a new computer to your network. The network user 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 a problem

Which of the configuration values would you most likely need to change?

Default gateway.
You manage a network of 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
which of the following types of antennas would you use on the AP to provide a 360-degree dispersed wave pattern?
omni-directional
you are implementing a wireless network in 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.
replace the omni-directional antenna with a directional antenna
you have decided to conduct a business meeting at a local coffee shop. The coffee shop you chose has wireless hotspot. you decide to check your e-mail before the meeting begins, but when you open the browser you cannot gain internet access. What is likely the cause of the problem?
mismatched SSID
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.
You are trouble shooting 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
You have decided to implement Gigabit ethernet on your network. Each switch port is connected to a single device.
Following the installation, you find a device connected to a switch that is only running a 100 mbps. What is the likely causes?
crosstalk
You have just connected four new computer systems to an Ethernet switch using spare patch cables. 3 out of 4 of are working. You replace the nic, but still no connection. what could be the possible cause?
failed patch cable
You have a cable internet connection at home. the installer had connected the router near the outsde wall of your house with RG-6cable
you move the cable router a distance of 50meters using RG-8 cables and special connector adapters. What condition are you most likely to experience?
echo
A network connected using a physical bus topology. One of the cables connecting a workstation to the bus breaks. what happens to communications?
no devices will be able to communicate
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
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 do you use?
OTDR
You manage a network that uses 1000BaseT Ethernet. You find that one device communicates on the network at only 100mbps. What device should you use to test the drop cable and the connection to the network
certifier
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 cat 6e cable to connect the wiring closet to the shipping building. What should you include in your plan?
repeater
You have been asked to document the wiring in your building. You need to identify the length of the cables, but most cables run through walls and ceilings, making them difficult to trace. What tool do you use?
TDR
What best describes the condition where a signal sent on one wire is received on another wire within the same connector
NEXT
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
what conditions are you most likely to experience?
attenuation
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.
what troubleshooting actions are you most likely to perform first?
Replace the network card in the user’s computer
What can a TDR Test
Wire length
Identify fault location
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.
what tool do you use to connect to the phone line at the punchdown block to see if yuo can make and receive calls?
butt set
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. what might you suspect as the problem?
Failed patch cable between the client system and the wall jack
You have a network connected to a physical star topology. One of the drop cables connecting a workstation is removed. What best describes what happens to communications?
All devices except the device connected with the drop cable will be able to communicate
You want to create a loopback plug using a single RJ-45 connector. How should you connect the wires in the connector?
pin 1 to 3 and 2 to 6
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. What steps will you perform first?
Use a media tester to test the cable between the computer system and the network switch.
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. What cabling would operate best in this environment?
shielded twisted pair
fiber optic cabling
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
Users report that the Internet is nolonger accessible. You suspect that the line connecting your building to the internet is not working properly. What allows the service provider to remotely test the local loop?
smart jack
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 remote computer using the TCP/IP protocol. Suddenly, the connection stops working and appears to hang. Which command can you use to check the connection?
nbtstat
Which TCP/IP utility gives you the following output?
Interface: 192.168.4.101 on Interface 0x3
Internet Address Physical Address Type
192.168.1.23 00-d1-b6-d7-c2-af dynamic
arp
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 132.168.2.1 to 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.
Which command displays network activity statistics for TCP, UDP, and IP?
netstat-s
You want to be able to view the DNS server address that a computer is using. Which of the following utilities would you use? (Select two.)
Ipconfig
Ifconfig
Which of the following tools would you use to view the MAC addresses associated with IP addresses that the local workstation has contacted recently?
arp
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:
fxp0: flags=8843<UP, BROADCAST, RUNNING, SIMPLEX, MULTICAST> mtu 1500
inet6 fe80: :2a0:83ff:fe30:57a%fxp0 prefixlen 64 scopeid 0x1
inet 192.168.1.235 netmask 0xfffffx00 broadcast 255.255.255..255
ether 00:a0:83:30:05:7a
media: Ethernet autoselect (100BaseTX <full-duplex>)
status: active
1o0: flags=8049<UP, LOOPBACK, RUNNING, MULTICAST> mtu 16384
inet6 : : 1prefixlen 128
inet6 fe90: : 1%1o0 prefixlen 64 scopeid 0x7
inet 127.0.0.1 netmask 0xff000000

Which of the following operating systems are you working on?

linux
Which TCP/IP utility gives you the following output?
Interface: 192.168.4.101
Internet Address Physical Address Type
192.168.1.23 00-d1-b6-b7-c2-af dynamic
arp
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
Examine the following output:
Active Connections
Proto Local Address Foreign Address State
TCP SERVER1:1036 localhost:4832 TIME_WAIT
TCP SERVER1:4798 localhost:1032 TIME_WAIT
TCP SERVER1:1258 pool-141-150-16-231.mad.east.ttr:24076 CLOSE_WAIT
TCP SERVER1:2150 cpe-66-67-225-118 .roc.res.rr.com: 14100 ESTABLISHED
TCP SERVER1:268 C872c-032-.cpe.net.cale.rers.com:46360 ESTABLISHED
TCP SERVER1:2995 ip68-97-96-186.ok.ok.cox.net: 23135
Which of the following utilities produced this output?
netstat
While troubleshooting a problem on a Linux system, you run a utility that generates the following output:
5. s3232.gw.Seat.someisp.net (63.201.72.9) 38.433 ms 38.713 ms 39.085 ms
6. st11122.garl.Seat.someisp.net (211.242.9.121) 38.620 ms 38.593 ms 38.050 ms
7. oc48-6yy.Seat.someisp.net (14.248.154.129) 57.440 ms 56.678 ms 57.675 ms
8. t223hgh-ytry.swa.someisp.net (142.133.89.232) 103.041 ms 57.181 ms 56.619 ms
9. t8343mmd.cgssel.someisp.net (152.191.10261) 91.977 ms 93.971 ms 93.767 ms
10. twirem2.cgssfdl.ip.someisp.net (145.97.133.23) 92.453 ms 92.337 ms 93.523 ms
11. twerrm1.nfffsiny.ip.someisp.net (117.116.141.38) 106.000 ms 106.007 ms 106.007 ms 105.283 ms
12. gbed22repp0.n5ddsdsy.ip.someisp.net (123.194.132.8) 103.198 ms 105.447 ms 104.263 ms
Which of the following utilities were you using?
traceroute
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 information 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