Tech Flashcards Library

These FlashCards are contributed by you (our online community members). They are organized by our knowledge base topics. Specifically, by the Tech sub-topics.

19 Computer Tech FlashCards

Group: Computer Tech

Topic: Computer Tech

Tip: Is your IP blacklisted?

How to check if your IP address is blacklisted:

Go to and enter in the IP Address of your outgoing IP address. 




Network Address Translation (NAT). The process of modifying network address information in a data packet header while in transit across a router for the purpose of remapping a given address space into another. Allows you to hide your local IP addresses from the Internet.

Topic: DHCP

Tip: MS DHCP Preferred Over SOHO Devices

It is better to install a Microsoft DHCP server in your business network over the more limited DHCP servers provided by SOHO devices such as those found in wireless routers, firewalls, the Comcast router, etc. Installing a Microsoft DHCP server allows you to take advantage of more advanced features.

Topic: DNS

Tip: Fast, Free DNS Servers

The best free and fast DNS server service provider is OpenDNS. At least that's who we are currently using and recommending.

OpenDNS free dns server list:


If you wish to try others, search for free fast Public DNS Servers List.

Topic: Exchange Server

Q&A: Share Contacts in Exchange Server 2003

What is the best way to share addresses in Exchange Server 2003?


Create a Contacts folder in Public Folders.  All a user will need to do is browse to the Public Folders section, go to properties, and check the box under Outlook Address Book tab.

Public folders have inverse permissions from individual Mailboxes.  A mailbox has initial permissions granting access only to its owner.  The owner may elect to open up permissions, allowing others to see various folders within his mailbox.   Public folders are born with full access granted to everyone.  The creator of the public folder can then tighten down access permissions as appropriate.

Topic: Hardware



Definition: Megabits (mb) per second. A bit is either a 0 or 1 (a digit) and a byte is a string of 8 bits. 8 mbps (megabits per second) equals 1 MB/sec (megabytes per second). Therefore 54 mbps is equal to a max of 6.75 MB/second.


Definition: A high speed network of storage devices availabe to all servers on a LAN or WAN

Topic: Non-Removable Storage Technology



Definition: A number used to identify a device attached to a SCSI bus.  In a SAN the LUN is used to identify a unit of raw disk storage often refered to as a logical volume.  A LUN can be a portion of a single drive, multiple drives or of a RAID drive.



RAID is the acronym for a Redundant Array of Independent Drives. RAID specifies several "levels," 0, 1, etc. Different levels provide different options. One level allows you to combine multiple smaller drives into one, huge volume. Another level offers tremendous performance boosts by "striping" data across multiple drives such that reads and writes are split across the drives. If one drive fails, the other takes over until the bad drive is replaced. Once replaced, the RAID subsystem automatically restores the mirror.

Topic: Removable Storage Technology

Q&A: High Capacity DVDs - Blue Ray or HD?
Question: Two relatively new DVD standards have emerged, HD DVD, and Blue Ray DVD. What are the differences?


HD DVDs have a maximum storage capacity of 15 GB for single layer disks, and 30 GB for dual layer disks.

Blue Ray DVDs have a max capacity of 25 GB for singler layer disks, 50 GB for dual layer.

Neither standard is yet a clear "winner."

For more info, you might want to check out "Removeable Disks - a frief Overview & history."


ISO Image

Definition: A disk image of an ISO 9660 file system usually with a .ISO extension. ISO stands for International Organization for Standardization (ISO) and standard 9660 describes a standard for storing data on a CD or DVD. An ISO image (or .ISO file) is a single computer file that is a copy of an existing file system (all files including all the filesystem metadata (boot code, structures, attributes, etc.). An ISO image can contain the entire contents of a CD or DVD.

Topic: Software

Q&A: IP Address Field
Question: I set up the SMTP virtual server on my web hosting server. I can send from other boxes, but not from websites hosted on the box that has the SMTP Virtual Server. Any ideas?


Check the IP address of the SMTP Virtual Server. If you want to serve ALL IP's on that box, then set it to All Unassigned IPs.

Topic: Windows Server 2003

Q&A: Assign IP Address Range to VPN Clients

On Windows Server 2003, how do you assign a specific range of IP addresses using DHCP to VPN clients?


On your VPN server, in Routing and Remote Access (Administrative Tools | Routing and Remote Access), right click server (your VPN server), select Properties. On the IP tab, edit the Static Address Pool.

Q&A: Go with at least Windows Server 2003

I have several Windows 2000 Servers, should I upgrad them? I have to setup a new server, should I install another Windows 2000 Server or dive into Windows 2003? What about Windows Server 2008?


We currently recommend at least Windows Server 2003 and actually prefer Windows Server 2008 because too much "new" software just does not install on Windows 2000 Server. For example, Quickbooks 2009 database install requires Windows Server 2003 or higher.

Q&A: Set time limit for disconnected session setting

In Windows Server 2003 terminal server, how do you automatically log off disconnected sessions? I'm getting the following error:

"The terminal server has exceeded the maximum number of allowed connections. The system can not log you on. The system has reached its licensed logon limit. Please try again later."


On your terminal server, adjust the Set time limit for disconnected session setting. In Group Policy Object Editor (Start | Run | gpedit.msc), drill-down to the setting: Computer Configuration > Administrative Templates > Windows Components > Terminal Services > Sessions. You'll see 5 settings you can adjust.

Topic: WINS


Windows Internet Name Service (WINS)


Even though DNS mostly replaces WINS as of Windows 2000 Server, WINS still has benefits within a Microsoft network.

Topic: Wired Networking

Q&A: Cat 5, 5e, 6, and 6a Connectors

Do I need different connectors for Cat 6 then what I'm currently using for Cat 5?


No, Cat 5, 5e, 6, and 6a all use the same RJ-45 connectors and are downward compatible. Meaning you can use a Cat 6 cable in a Cat 5 network. The difference is in the quality of the cable. Cat 5e is rated higher than Cat 5, Cat 6 is rated higher than Cat 5e, etc.

However, when building a Cat 5 or Cat 6 cable, you have to use the correct type of connector. Meaning, Cat 6 connectors are built differently even though you can use already made cables.

Q&A: Cat 5e and Gigabit Networks

Can I run a Gigabit network over Category 5 or Category 5e?


No to CAT 5, or at least almost never. Yes to CAT 5e. Category 5e cable is enhanced over Category 5 to adhere to more stringent standards and is recommended over CAT 5 for speeds above 100 Mbps and up to 1 Gigabit.

However, Category 6 or 6a is recommended over CAT 5e because of it's even higher quality and some properly installed CAT 6 networks can support 10 Gigabit speeds. Although for 10 Gigabit, CAT 6a is recommended.

CAT 7 is rated for 10 Gigabit but supports up to 100 Gigabit.

Topic: Wireless Networking

Tip: Weak Wireless Signal

If you have a USB wireless device such as a wireless NIC, mouse controller, etc. that has a weak signal because of location, try adding a USB extension cable and placing the device in a more open location.

USB cables from stores such as Radio Shack, Best Buy, etc. are over priced 5 or 6 times what you can get on the internet.

For wireless network cards, you can also buy a range-extending antenna for the computer's WiFi card or router, or a wireless range extender. For service: 916-726-5675
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Printed 12/6/2021