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Local Area Network

Questions concerning the setting up, troubleshooting and operation of wired LANs used by businesses and other organizations

4,003 Questions

How do you fix a lan connection with limited or no connectivity?

It looks like you have a network with static ip addresses. You have set up manually an ip address for your network adapter. Just go in the properties of the adapter and put an ip address from the same subnet as other users are using in the network.

What is a switch?

Circuit Switching

Circuit switching is used for ordinary non-digital telephone systems. It allows communications equipment and circuits to be shared among users. Each user has sole access to a circuit (functionally equivalent to a pair of copper wires) during network use.

A circuit switching network is the one that establishes a dedicated circuit or channel between nodes and terminals before the user may communicate. Each circuit that is dedicated cannot be used by other callers until the circuit is released and a new connection is set up. Even if no actual communication is taking place in a dedicated circuit's channel, that channel still remains unavailable to other users. Any other channel that is available remains unconnected (set to "idle") until a new call appears.

Does a bridge separate collision domains?

No a bridge will transmit all network protocols to all ports, without restriction; thus the term "Bridge." A Router in true bridge mode will do the same, unless you implement some form of route management (managed bridge / router).

What are good reasons for installing a LAN?

There are really only two reasons for using a LAN:

  1. To have others share resources
  2. To add security

Full form of switch mode power supply?

An auto-switching power supply is one which can switch between power inputs instantaneously, preventing a loss of current to the machine.

These power supplies may have redundancy built into them (in effect, they may be one or more traditional power supplies built to work together), or they may not. the key is that they have multiple power inputs (usually in the form of two or more power cords), and can chose which ones to draw power from.

How do you make a phone cable terminated RJ45 on one end and RJ11 on the other?

terminate the RJ11 end and on the RJ45 end crimp the 4 wires in the 4 middle slots. run the wires straight through, no crossover

What is the value of 1916 dime marked with a w?

The "W" you see is not the mintmark, it is instead the designer's initials. Rather, the mintmark (if any) is found on the reverse of the coin after the "E" in "ONE DIME". If your coin has no mintmark, or an "S" mintmark, it is a common coin that unless in really great condition, generally sells for about $3 or so. On the other hand, if you have a "D" mintmark, you have an exceedingly rare coin worth several hundred dollars even in the worst condition.

What is the name of the kernel component that uses the iptables rules to filter network traffic?

system-config-firewall (FEDORA) or system-config-securitylevel (RHEL), "that is where you build you firewall"

the netfilter component is a set of tables that hold rules that the kernel uses to control network packet filtering. "Fedora and RedHat Enterprise Linux... fifth edition"

Compare 1.5 Mbps 384 Kbps FIOS to cable for internet speed?

When comparing be sure to read all the fine print. Somewhere imbedded in all the hype about upload/download speeds for most every internet provider will be the words "up to". One seldom gets the full 'rated speed' but rather anything between nothing and the highest number. There is no recourse against the IP provider as they will point out those two silly words "up to" and send you on your way.

How do you calculate a subnet mask address in networking?

Calculating a subnet mask depends on whether you are using the default, classful mask or a true subnet mask to divide a network into smaller pieces.

The defaults are on octet boundaries (every 8 bits):

255.0.0.0 class A network
255.255.0.0 class B network
255.255.255.0 class C network

Any other type of subnet mask with 4 octets (iPV4) can use combinations of those with any octet value from 0 - 255. No number may be larger than 255.

Calculating other subnet masks would be based on how many subnets you want in the network. You could have values such as:

255.192.0.0
255.255.248.0.0
255.255.255.252

The first octet must at least be 255. The other octets may change, based on whether it is a classful default network or it is being subnetted.

What kind of connector does a Ethernet cable use?

The UTP cable it uses an RJ-45 connector. For coaxial cable, it will be either an F connector or a BNC connector.

Is it safe to open your TCP and UDP ports?

Depends on what ports you open, and what kind of internet connection you are running. If you are running a residential internet connection, and you are doing your usual day-to-day things (email, web browsing, youtube) then you should not have an issue opening ports 80, 25, 443 and whatever else you use. Though you should note that if you are doing more dangerous things on your connection (you know who you are ;) ) then you should probably not open these ports as they can be used for malicious things.

Where can I find my gateway address to the internet?

Depending on what operating system you have - if it is a Windows system then use the 'ipconfig /all' command. Look for the 'default gateway' address. This is the address to your internet.

For Unix based systems, use the 'ifconfig -a' command and/or netstat command to get the same info.

How do you make telnet server under windows?

First, Make sure that you have TelnetServer Installed On Your Computer.....

IF NOT:

Go to Control Panel - Programs and Features - Turn Windows features on or off... Make Sure the check boxes next to Telnet Client & Telnet Server are checked. Exit

Once you have it installed, Go to Command Prompt by going to the start menu, clicking "run", and typing in "cmd". Make Sure you run command prompt as an administrator.

In Command Prompt, type

net user Administrator /active:yes

This will activate the administrator account temporarily

Now, Think of a username and password that you want to login to your telnet with.....

Then Type:

net user (username) (password) /add

Now using the same username and password, Type:

net localgroup Administrators /add (username)

net localgroup /add TelnetClients

net localgroup TelnetClients /add (username)

Now to enable the Telnet Services (you won't have to do this everytime you want to start your Server):

In command prompt, type:

sc config TlntSvr start= auto

Now this is something you will have to type every time you want to start your Server:

net start TlntSvr

Although it is Started, you cannot use it quite yet,

In command prompt, type:

netsh

firewall

add portopening TCP 23 "Telnet"

DONE! You can now Access It by following the instructions below

Your Telnet Server Has Now Been Created!To access it, Go to command prompt, type:

telnet

o

(your local ip address)

n

Then login with the username you created earlier...

Why do you need Ethernet cord in a network?

its only one of the 2 options the other is a wireless adapter but the cord is more reliable

What is the average throughput for gigabit network connection?

The throughput of a gigabit network connection can vary somewhat based on things such as the speed of the CPU, however, the average throughput is around 300Mb/s. The symbol for giga is G.

Is media a requirerment for a client to connect to a server on a client server LAN?

Media is always required to connect one device to another on a network. It doesn't matter if it is a client server network or a peer to peer network.

How thick are Ethernet cables?

I didn't find a specific reference (perhaps that part isn't standardized), but it looks like the standard UTP cable has a thickness of about half a centimeter. Note that there are other kinds of cables - some of the kinds include UTP (unshielded, the most commonly used cable, mentioned above), STP (similar to UTP, but shielded, therefore a little thicker), and coaxial cable. Optic fibers are also used for Ethernet.

I didn't find a specific reference (perhaps that part isn't standardized), but it looks like the standard UTP cable has a thickness of about half a centimeter. Note that there are other kinds of cables - some of the kinds include UTP (unshielded, the most commonly used cable, mentioned above), STP (similar to UTP, but shielded, therefore a little thicker), and coaxial cable. Optic fibers are also used for Ethernet.

I didn't find a specific reference (perhaps that part isn't standardized), but it looks like the standard UTP cable has a thickness of about half a centimeter. Note that there are other kinds of cables - some of the kinds include UTP (unshielded, the most commonly used cable, mentioned above), STP (similar to UTP, but shielded, therefore a little thicker), and coaxial cable. Optic fibers are also used for Ethernet.

I didn't find a specific reference (perhaps that part isn't standardized), but it looks like the standard UTP cable has a thickness of about half a centimeter. Note that there are other kinds of cables - some of the kinds include UTP (unshielded, the most commonly used cable, mentioned above), STP (similar to UTP, but shielded, therefore a little thicker), and coaxial cable. Optic fibers are also used for Ethernet.