Computer Networking

A cable tie tool is used for fastening electric cables and wires and helps organize. They are used to keep them together in bulk to prevent messy wires and cables.

With a static IP address you have to manually configure each workstation, by hand. Doing so can lead to duplication errors because you mistyped an address that is already in use. You might also get the other settings wrong, such as the default gateway, DNS servers, etc.

With DHCP you can more easily manage your address space in a network, and there will be no duplication because DHCP will not give out the same address twice. Other settings can be set once and then distributed to workstations automatically, without error.

Finally, you can save on IP addresses because the workstations will use the addresses only as long as they need them, and then return them to the pool for other to use. With static addressing that will never happen, and you might run out of addresses for your network.

RFC 1918 is Address Allocation for Private Internets The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets: 10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix) We will refer to the first block as "24-bit block", the second as "20-bit block", and to the third as "16-bit" block. Note that (in pre-CIDR notation) the first block is nothing but a single class A network number, while the second block is a set of 16 contiguous class B network numbers, and third block is a set of 256 contiguous class C network numbers.

It's called NAT and it stands for Network Address Translation.

IP addresses are mapped from inside to outside addresses, transparent to end users. There are three different types of NAT (Static, Dynamic, and Overloading). The most common is NAT overload or sometimes called Port Address Translation (PAT).

It maps an inside private address like 192.168.1.2 to a public address on your home router like 208.67.220.221. The problem is that you only have one public address on your home router, so we use TCP or UDP ports to identify different inside address. For example your web browser connects to a web server using a source port of 50,000. The router makes a table and swaps out the original source address and port (192.168.1.2:50000) to an outside public address and port number (208.67.220.221:50000). When the web server responds back, it sends it to the outside address and port number of 208.67.220.221:50000. The router has a table and knows which inside computer to send this to.

The main reason we use this protocol is because we are running out of IPv4 addresses pretty fast. If we had to use a public address for every computer in the world we would have ran out of addresses a long time ago. Another reason is because private addresses are not routable on the Internet like 192.168.0.1.

1. Web conferencing is a form of real-time communications RTC in which multiple computer users, all connected to the Internet, see the same screen at all times in their Web browsers. Some Web conferencingsystems include features such as texting, VoIP (voice over IP) and full-motion video.

Bell labs has managed to break the Petabit barrier, they have achieved a speed of 15.5 Tbit/s over a single 7000 km fiber. Now one must keep in mind this was multiplexed over hundreds of channels and was a single mode cable.

The maximum realistic speed application on single mode fiber cable is about 10gb speed. There are standards for 100 gigabit over multimode fiber and single mode, but those are not widely in use at the moment.

A network. Computers can be networked together to allow many users to access the same information stored centrally, or to allow multi-user access to systems that cannot be set up on individual machines.

Single Mode cable is a single stand (most applications use 2 fibers) of glass fiber with a diameter of 8.3 to 10 microns that has one mode of transmission. Single Mode Fiber with a relatively narrow diameter, through which only one mode will propagate typically 1310 or 1550nm. Carries higher bandwidth than multimode fiber, but requires a light source with a narrow spectral width. Synonyms mono-mode optical fiber, single-mode fiber, single-mode optical waveguide, uni-mode fiber.

Simple. But you have many choices.

1. If you're using a type of internet such as Internet Explorer, that may be the reason. Even if it is Mozilla Firefox.

If you wish to change that type of internet, you can download 2 other types of internets.

The first is Mozilla Firefox. It is high speed for most computers.

Or (my favorite) Google Chrome. You can go straight to the Goggle Home Page and then by the top, right corner, it should say that you can download Google Chrome.

Google Chrome is amazing. It is HD + High Speed and totally amazing! :)

what is the advantage of the metropolitan area network?

* sharing of resources such as printers; hence cost effective.

* can send local emails

CompTIA N+ certification is a proof to the candidate's expertise in installing, configuring and troubleshooting network hardware, protocols and peripherals. Upon the completion of this course, the candidate will be able to effectively troubleshoot the networking system.

Source: http://www.bookmybootcamp.com/bootcamp/comptia-networkplus-bootcamp

A MAC address is a fixed number that is 'burned' into each NIC

You need to replace it.

The manufacturer will repair it or supply a replacement screen to you. There are also many third party suppliers who can offer replacement screens.

In Packet switching the packetss are stored and forwarded from primary storage (RAM) while in Message switching the message are stored and relayed from seconadary storage (disk).

In Packet switched network data are transmitted in discrete units of potentially variable length blocks called packets, while in Message switching mecahnism a node recives a message stores it until the apporiarate route is free, then sends it along.

Message switching sends data units that can be of any length. Packetswitching has a maximum packet size. Any message longer than that is splitup into multiple packets.

By default Class C subnet mask is 255.255.255.0 = 24 bits for network id and 8 bits for host id. in Binary 1111 1111. 1111 1111. 1111 1111. 0000 0000 Here all 1s are Network bits and all 0s are host bits. For this subnet mask you can have 256 hosts. And you can use 254 host and asign IP address to them. By Saurabh

The computer on a network that requests from another computer is called the client.

IT professionals is a very broad term, and as such, various types of professionals make various incomes. These hourly wages will probably be between $12 and $250 an hour, depending on the job function. Try using a website that monitors average salaries for a better idea of what you might be worth if you decided to be an IT professional. A link has been provided.

The IP Address identifies a PC on a network.

Source: I am an IT student in College :)

The entire 127 range (127.0.0.1 to 127.255.255.254) is considered the LOOPBACK address range, and is in the class A network. This address range or block is reserved just for local testing.

I think you can only download safari with a mac.But if you ARE using a mac you may be forgetting to save the file.

Switches connect multiple devices on a network, similar to a hub, but with one difference.

Switches have the ability to "remember" which device is connected to which switch-port - and only retransmit to switch-port connecting the destination-device for which the data is intended, thereby creating multiple collision domains (which is good - less chance for lost data).

In contrast, a hub simply retransmits the data to EVERY interface on it, creating one huge collision domain.

Basically, modem is used to connect the analog world to the digital world. In other words, you can say it is the device that is used to convert the analog signal to digital signal. For eg. the modem connected with a computer is usually converts the analog signal that comes through the wire to the digital bit bcoz computer can only understands the digital signal...

One of the most simplest ways a computer, or device, can obtain two IP addresses is if you have different network cards in your computer. For example, a laptop might has a Wireless Network Card as well as an Ethernet Card. You are able to assign an IP address to your Ethernet card and the Wireless card. Remember that an IP address is not assigned to a computer, but rather it is assigned to a network interface card.

Yes. There are loads of different ones on the market, from internal ones to external ones.

Personally I recommend external USB ones.

Internal ones are good too, but take up a PCI slot thatcould be given to something more worthwhile. Most home users cant install them. And, if and when you get a second desktop, you cant share the device.