Port-Base address (in hex)
LPT2 : 278-27F
LPT1 : 378-37F
Floppy Controller: 3F0-3F7
Hard Drive Controller, 16 bit, ISA: 1F0-1F8
2. If Microsoft Windows Firewall is blocking a port that
is used by a service or by a program, you can configure the
Windows Firewall to create an exception. Windows Firewall may
be blocking a program or a service if the following conditions
- Programs do not respond to a client's request.
- Client programs do not receive data from the server.
3. NBTSTAT This utility displays current NetBIOS over TCP/IP
connections, and display NetBIOS name cache.
4. NETSTAT Displays protocol statistics and current TCP/IP
connections since the server was last booted.
5. TRACERT Used to determine which route a packet takes to
reach its destination from source.
6. IPCONFIG Used to display Windows IP configuration information.
7. NSLOOKUP This utility enables users to interact with a
DNS server and display resource records.
8. ROUTE Used to display and edit static routing tables.
9. Network is not configured with WINS server. WINS server
resolves the NetBIOS names to IP addresses. The network need
to be configured with WINS (or LMHOSTS file on each computer)
for NetBIOS name resolution.
10. If all the nodes on the network have been disconnected
still if the switch port is blinking rapids even in the absence
of any data, it is very likely that the switch port or the switch
11. Running a command like "ping" or "ipconfig" will open
the command screen. However, the command screen closes soon
after the execution of the command. If you intend to observe
the results of any such command, you need to open the DOS screen
by going to Program Files | Accessories | Command Prompt.
12. When doing over the network installation, the most likely
causes for failure are:
a. The domain controller may not be up and running. You
need to ensure that the domain controller is running.
b. The username and password may not be correct. You
need to have appropriate access rights to join a domain.
Ensure that you have appropriate access rights and that
you have typed in correct username and password. Note that
the passwords are case sensitive in Windows 2000.
13.Some of the important commands useful in trouble shooting
TCP/IP networks are:
I. Ipconfig: Displays TCP/IP configuration values, including
IP address, subnet mask, and default gateway.
II. Ping: This command can be used to verify whether
the target ip address or host name is present. You need
to specify the target IP address or host name.
III. route: Displays and manipulates route information.
IV: Tracert: Determines the route packets take to reach
the specified destination.
14. The most important thing to do when a network card is
replaced is to update the NIC driver. Without this, the network
card may not work. The NIC speed is limited by the peer device.
If it is connected to a 1Gbps switch port, then it will transmit
at rated speed. However, note that if the cable does not support
1 Gbps speed, you may need to replace the cable also. Usually,
the network devices fall back to mutually acceptable speeds.
15. If a user complains that he is not able to connect to
his Windows 7 computer remotely the reason may be Windows Firewall
restricts communication between your computer and the Internet,
you might need to change settings for Remote Desktop Connection
so that it can work properly.
a. Open Windows Firewall by clicking the Start button
Picture of the Start button, and then clicking Control Panel.
In the search box, type firewall, and then click Windows
b. In the left pane, click Allow a program or feature
through Windows Firewall.
c. Click Change settings. Administrator permission required
If you're prompted for an administrator password or confirmation,
type the password or provide confirmation.
d. Under Allowed programs and features, select the check
box next to Remote Desktop, and then use the check boxes
in the columns to select the network location types you
want to allow communication on.
e. Click OK.
4.6 Given a scenario, troubleshoot operating
system problems with appropriate tools
1. While preparing for dual boot with Windows 2000 Professional,
note the following points:
a. Windows 2000 must be installed on a separate volume.
If a separate volume is not available, repartition the hard
disk suitably, and reformat. You also need to take suitable
b. If you want to have dual boot between Windows NT 4
and Windows 2000 as the only operating systems, ensure that
Service Pack 4 is installed on Windows NT 4. This is required
since Windows 2000 upgrades the NTFS to NTFS 5. NT4 requires
Service Pack 4 to read and write to NTFS 5.
c. You must install Windows 2000 only after installing
MS-DOS or Windows 95.
2. By default, you can start recovery console on a PC using
Windows 2000 OS using,
a. The Windows 2000 Professional Setup Disks
b. From the CD ROM drive using Windows 2000 Professional
CD (if the CD-ROM drive is bootable). Also, you can have
"Recovery Console" as a start up option by typing \i386\winnt32.exe
/cmdcons at the command prompt, after switching to the CD
ROM drive letter.
3. Fault tolerance boot disk is a floppy disk that enables
you to boot a computer in the event that the first disk in a
mirrored volume fails. If you mirror the installation folder
in a Windows 2000 Server, you will not be able to boot because
boot.ini points to the first volume. Therefore, you need to
create a fault tolerance boot disk that contain an appropriately
edited Boot.ini file, that points to the mirrored volume.
4. If you fail to boot, first try to boot in Safe Mode. If
it doesn't work, try booting to Last Known Good Configuration.
If both fail, you can try using Recovery Console.
5. If your Microsoft Windows XP-based computer does not start
correctly or if it does not start at all, you can use the Windows
Recovery Console to help you recover your system software.
6. Automated System Recovery (ASR) is a part of an overall
plan for system recovery so that you are prepared if the system
fails. ASR should be a last resort for system recovery. Use
ASR only after you have exhausted other options. It is recommended
that you use ASR only if all other options to repair the system
(such as Last Known Good, and Safe Boot) have failed.