CompTIA Network+ Certification Study Guide part 65 pptx

ChApTEr 12 : Network Troubleshooting Methodology 626
What is the difference between TCP and UDP if they both operate Q:
at the transport layer?
Although both TCP and UDP are transport layer protocols and A:
provide the same basic function, TCP is a connection-oriented
protocol, which means a session is established before data is
transmitted, and acknowledgments are sent back to the send-
ing computer to verify that the data did arrive and was accurate
and complete. UDP is connectionless; no session or one-to-one
connection is established prior to data transmission. This makes
UDP the faster of the two, while TCP is the more reliable.
SElF TEST
You are a network consultant specializing in supporting Small 1.
Office Home Office (SOHO) networks. One of your clients
maintains an office consisting of three workstations configured
in a peer-to-peer workgroup. This office does not have a server
computer at this time. One of the workstations, \\OFFICE1,
has an IP address of 192.168.1.100 and has a file share that
the other three workstations are able to access using the follow-
ing syntax: \\OFFICE1\share. Your client has called you in to
troubleshoot a new workstation that they have recently installed
that is unable to access this share. When you arrive on-site,
you find that the workstation is able to ping OFFICE1 by its IP
address, but not by its NetBIOS name. What is the best way for
you to allow the new workstation to access the file share located
on OFFICE1?
A. Upgrade OFFICE1 to Windows 2003 server and configure the
WINS Server service.
B. Add an entry to the lmhosts file on the new workstation.
C. Add an entry to the findhosts file on the new workstation.
D. Upgrade OFFICE1 to Windows 2003 server and configure the

DNS service.
You are troubleshooting network connectivity issues on a network 2.
that is running Windows servers and clients. Users are reporting
that they are unable to send e-mail, though they have been receiving
messages from external users without a problem. During your
troubleshooting, you see the configuration item on the Windows
server that is shown in Figure 12.8. Based on this information, how
can you correct the issue that this office is reporting?
Self Test 627
A. Install and configure the POP3 service.
B. Change the startup type of the SNMP Trap Service to Automatic.
C. Start the SMTP service.
D. Start the Routing and Remote Access Service.
FIGurE 12.8 Services Console.
You are a network consultant and have been called in to 3.
troubleshoot a connectivity issue on a UNIX network. From the
client’s UNIX workstations, which of the following utilities can
you use to perform network troubleshooting? (Select all that apply.)
A. ping
B. tracert
C. pathping
D. traceroute
E. nslookup
F. dig
4. You are the network administrator for a network that employs
a Windows 2003 server and 30 Windows XP Professional
workstations. The Windows 2003 server runs the DHCP service
to provide TCP/IP configuration information to the Windows XP
clients. You receive a call from one of your users stating that he
ChApTEr 12 : Network Troubleshooting Methodology 628

is unable to browse any internal network resources or Internet
Web sites. Other users on the same subnet are able to browse
without difficulty. You run the ipconfig command on the problem
workstation and see the following output:
Windows IP Configuration
Host Name . . . . . . . . . . . . : IBM-A38375FF22E
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Wireless Network Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/Wireless 2200BG
Network Connection
Physical Address. . . . . . . . . : 00-1E-25-1A-D3-5A
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 169.254.1.96
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . :
DNS Servers . . . . . . . . . . . :
Lease Obtained. . . . . . . . . . : Tuesday, March 29, 2005 1:00:10 PM
Lease Expires . . . . . . . . . . : Wednesday, March 30, 2005 1:00:10 PM
Based on this output, why is this workstation unable to browse any
network resources?
A. The default gateway is unavailable.
B. The workstation could not contact a DHCP server.
C. The workstation is configured with the incorrect default gateway.
D. The workstation’s DHCP lease has expired.

Self Test 629
You are the network administrator for a sales office. Until now, 5.
this has been a small peer-to-peer network consisting of five
Windows XP workstations using lmhosts files on each workstation
to perform name resolution. The sales force has recently expanded
significantly, requiring you to purchase a Windows Server 2003
server and 15 additional workstations. You have encountered
numerous troubleshooting situations where a workstation’s
lmhosts file was missing or out of date, preventing name resolution
from taking place. How can you improve the name resolution
process for your network?
A. Install the DNS service on the Windows 2003 server.
B. Install the WINS service on the Windows 2003 server.
C. Install the DHCP service on the Windows 2003 server.
D. Install the DNS service on each Windows XP workstation.
You are the network administrator for a large pharmaceutical compa-6.
ny that has more than 1,000 workstations. To simplify TCP/IP con-
figuration for these numerous clients, you installed a DHCP server
over a year ago to automatically configure your clients with an IP
address, as well as the following common configuration information:
A. Subnet Mask: 255.255.0.0
B. Default Gateway: 172.16.0.1
C. DNS Servers: 172.16.0.100
D. 172.16.0.101
As part of a recent network redesign, you had to change the default gate-
way used by your clients to a different IP address: 172.16.1.1. You made
the necessary change on the DHCP server, and most of your clients
were updated automatically. After you make this change, you receive
a call from one user who no longer is able to browse the Internet. You
examine the TCP/IP configuration of her LAN connection (Figure 12.9).

How can you configure this workstation with the correct default gateway
information? (Each choice represents a complete solution. Choose two.)
A. Delete the manually configured information and select Obtain
an IP address automatically.
B. Run ipconfig /renew from the command prompt.
C. Manually update the IP address of the default gateway.
D. Run ipconfig /release from the command prompt.
ChApTEr 12 : Network Troubleshooting Methodology 630
You are the administrator for the network shown in the Figure 12.10. 7.
Based on the information in this figure, which computer is config-
ured incorrectly?
A. Computer1
B. Computer2
C. Computer3
FIGurE 12.9 TCP/IP Properties.
Self Test 631
D. Computer4
E. Computer5
F. Computer6
G. Computer7
H. Computer8
FIGurE 12.10 Sample network architecture.
You are the network administrator for the network shown in 8.
Figure 12.11. You have recently purchased a new Windows XP
workstation called Computer9 that you now need to add to Subnet
C. Which of the following would be a valid IP address that would
allow Computer9 to access resources on all four subnets?
A. 192.168.3.155
B. 192.168.3.1
C. 192.168.3.0

D. 192.168.3.255
ChApTEr 12 : Network Troubleshooting Methodology 632
You are the administrator for the network shown in Figure 12.12. 9.
You receive a help desk call from the user of Computer8, stating
that she cannot browse the Internet or access a shared folder
located on Computer5. Upon investigating the issue, you find
that Computer7 is able to access the Internet and other shared
resources, but Computer8 cannot ping any other hosts on the
network. Based on this information, which of the following are
likely points of failure that you should investigate? (Each selection
represents a complete choice. Select all that apply.)
A. The NIC installed in Computer8
B. The network cable attaching Computer8 to the network
C. The NIC installed in Router A attached to Subnet B
D. The TCP/IP configuration of Computer7
FIGurE 12.11 Sample network architecture.
Self Test 633
FIGurE 12.12 Sample network architecture.
You are the administrator of the network shown in Figure 12.13. The 10.
firewall in the exhibit was installed by an outside consultant a few
weeks ago. Once a month, one of your company’s employees needs
to access the FTP site of one of your company’s business partners,
ftp.airplanes.com, to download large PDF files containing prod-
uct marketing information. You receive a help desk call from this
employee, stating that he is now unable to access this FTP site. The
last time he performed this task was before the firewall was installed,
and he says that it worked fine then. You are able to ping the ftp.
airplanes.com DNS name, and you can access www.airplanes.com,
which is located on the same physical machine. What is the best way
to restore this employee’s access to the ftp.airplanes.com FTP site?

A. Configure a firewall rule allowing traffic to TCP ports 20 and 21.
B. Configure a firewall rule allowing traffic to TCP ports 25 and 110.
C. Configure a firewall rule allowing all TCP traffic to this
employee’s workstation.
D. Configure a firewall rule allowing traffic to TCP ports 80 and 443.
ChApTEr 12 : Network Troubleshooting Methodology 634
You are the network administrator for a medium-sized law firm. 11.
You have recently deployed a WAP for use by your internal support
staff and attorneys. You have been charged with ensuring that only
legitimate users of your company network will be able to access
these WAPs. What are some steps you can take to enable network
connectivity to your WAP so that only legitimate users will be
able to obtain access? (Each choice represents a complete answer.
Choose all that apply.)
A. Enable MAC address filtering.
B. Enable the default SSID broadcast.
C. Enable WEP or WPA encryption.
D. Enable the DHCP server on the WAP.
FIGurE 12.13 Sample network architecture.
Self Test 635
You are the administrator of the network shown in Figure 12.14. 12.
You receive a call from the users of Computer5 and Computer6,
stating that they cannot access any resources on the Internet.
No other users on the network are reporting outages. Based on
this diagram, what is most likely causing this connectivity
issue?
A. The network cable attaching Computer5 to the network
B. The 192.168.1.1 interface on Router A
C. The 192.168.4.1 interface on Router B
D. The 192.168.5.1 interface on Router A

FIGurE 12.14 Sample network architecture.