Computer Networking

A modem. Modem is short for mudulator/demodulator. Telephone lines use analog signals which your computer cannot interpret. When analog signals reach a modem however, they are converted to digital signals and then passed to the computer. When sending data, this process is reversed.

The standard connector for Ethernet cable is called the RJ45 by everybody. The fact this not actually and RJ45 but is in fact a 8P8C in irrelevant to common usage.

cat5, cat5e, and cat6 are common specifications for unshielded twisted pair used in Ethernet cabling.

Cat5e is useful for distances of up to 100 meters ( you can get a bit more distance out of it) and speeds of up to 1gigabit per second. While cat6 can handle speeds of up to 10 gigabits per second there is no real use for cat6 outside of data centers or as backbone in large environments as the 10Gb equipment is frightfully expensive and a very very fast internet connection of 20 megabits per second is 500 times slower.

This is probably too much information but there you go. f:)

The most simplest answer is that, the network layer routes data beyond the LAN boundary and it ues routing table with IP addresses. This the layer that your ROUTERfuntions

The connection to server requires the port number to which you want to connect to.

Port serve as gates in the server which has a unique number, by which you can enter into the server.

There are several ports and several ways to connect to the server.

You should check out this list of port numbers and way to connect to them.

http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

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I don't think it has to be anymore than 2, but it can be quite a few. The problem with a hub say for a computer like a usb hub is that each device receives less power and they are all sharing the same port, its like hooking 5 computers to one modem.

A "Default Gateway" refers to the Router to which your Local Area Network is connected to. This Router provides the link to the outside world (Internet or Wide Area Network). If this is a home PC situation then the Broadband Router is the Default Gateway.When your PC requests a network resource (webpage or server share) that is not on the local subnet the request is automatically forwarded to the Default Gateway which in turn forwards the request to the far end (Node) of that link. You can have many Gateways on your LAN, each providing a Route to a particular extenal network. All networks must have one of these Gateways as default so all other requests can be sent to it by "Default" this is where the term comes from.

Dynamic Host Configuration Protocol (DHCP) is a client/server protocol that automatically provides an Internet Protocol (IP) host with its IP address and other related configuration information such as the subnet mask and default gateway. RFCs 2131 and 2132 define DHCP as an Internet Engineering Task Force (IETF) standard based on Bootstrap Protocol (BOOTP), a protocol with which DHCP shares many implementation details. DHCP allows hosts to obtain necessary TCP/IP configuration information from a DHCP server.
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The keyboard or a representation of one is the commonest. My opinion.

It is stored in millions of p2s, which means for every piesquared 1byte is stored.

Byte

Eyte

Nible

Niblex

Eytex

Wyte

Sudio

Oyte

NNblex

It routes things... lol If you have a cable internet connection for instance, the cable company gives you a cable modem that connects to the cable jack in the wall. To split this signal amongst multiple computers you need a router. The router plugs right into the modem and the computers plug into the router. The router then will devide the internet signal between the computers.

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There are many places where a person can get a dedicated web server hosting. Websites such as, 1 and 1, in motion hosting, and firehost all have dedicated web server hosting for those looking for it.

In 3DES, 3 distinct keys are used as K1, K2 and K3. First encrypt with K1, then Decrypt with K2 and finally Encrypt with K3 so actual key length used in 3DES is 168 excludin 8 bit party from each 64 bits means (56+56+56 becomes 168).

The word "type" here is a bit too broad; I'll try to answer this as best I can.

Wired: A typical home LAN is connected using CAT5e or CAT6 ethernet cable with RJ-45 ends. These sorts of networks can run at 10, 100, or 1000 Mbps speeds, though the most typical is 100 Mbps. The major advantage of a wired network is that it can run at higher speeds than wireless standards, especially if you're willing to shell out the extra cash for gigabit (1000 Mbps) devices.

Wireless: With the development of new wireless standards we have seen several different wireless speeds emerge: 11, 56, and 108 Mbps are the most common speeds, with 56 Mbps still being the most common. The main advantage of wireless networks tends to be portablility, though reception issues and speed are usually the major limiting factors.

This is actually a great question. Everyone has a Local Area Network (LAN). This could be as small as one computer plugged into a router in your house to as large as an office building. There is then a Wide Area Network (WAN) which connects several LANs together via a router. The WANs are then connected to each other via more routers. That is what an ISP is, a collection of routers with routes to the various networks all across the internet. All these interconnects form a web, hence the name the World Wide Web. *trivia* The Internet and the World Wide Web are actually two separate entities. The World Wide Web sits on top of the internet. (Internet is physical/link layer, WWW is protocol/application layer)

This command will allow you to copy a configuration from a TFTP server to the running configuration of a Cisco device.

When you issue the command you will be prompted for further details about the TFTP server.

The new configuration will replace the active one (or running configuration) and make any necessary changes.

computers in one office

Each layer in the sending device adds its own information to the message it receives from the above layer and sends it to the layer below it. At layer 1 the entire package is converted to a form to be transmitted to the receiving device.

On the receiving device side, the package is unwrapped layer to layer. Each layer removes data meaningful to it and sends the rest to the above layer and so on.

Hope this was helpful

By nour el houda

a standard reference model for communication between to end users in a network

The Destination Address (Layer 2 or Layer 3)

Repeaters and hubs

If the IP address is the one that is issued by the provider, then if you change it you cannot access internet. Only computers that have automatic IP address assigning option can change the configuration. In many countries it is illegal to change the configuration.

Servers, as their name suggests, provide a service. This can mean a wide variety of things. Some servers are configured for file storage (i.e. NAS [network-attached storage], FTP [file transfer protocol]), while others specifically respond to requests to provide content (such as Web servers [you're making use of one now if you're browsing the Web!]). Some can be used for managing network traffic (e.g. a corporate intranet) as seen in enterprise or large-scale business set-ups.