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Computer Networking

Computer networks are collections of computers which are connected together in order to communicate and transfer information. Questions about computer networks, networking protocols, and how to set them up belong here.

18,810 Questions

How do you make connection over LAN cable that have distance over 200 meters?

The maximum distance a utp cable can handle is 100 m.

If you need to bridge over 200 meter and you can only utp cable, you will need to put in enough hubs or switches so that the length of utp cable is never more than 100 m.

You can forego of the utp cable and make use of COAX cable. A good quality cable will transmit signals over around 300 m. distance.

You can forego of the utp cable and make use of fiber optic cable. Then you can transmit signals over a 40 km distance.

Wireless Microwave and WiMax would be an option to cover the distance using radio waves.

Which of the following are part of the context that protocols establish between devices before communication can take place?

The amount of data that the transmission media is able to carry.

Transmission timing

The method that will be used for transmission

Information regarding the physical setup of the network

All answers are correct.

Why is it important to hide IP addresses to protect a network?

It would be important to hide the IP address because you can't attack what you can't see ...

Characteristics and functions of file transfer protocol?

FTP is a simple network protocol based on Internet protocol and also a term used when referring to the process of copying files when using FTP technology.

To transfer files with FTP, you use a program often called the "client." The FTP client program initiates a connection to a remote computer running FTP "server" software. After the connection is established, the client can choose to send and/or receive copies of files, singly or in groups. To connect to an FTP server, a client requires a username and password as set by the administrator of the server. Many public FTP archives follow a special convention for that accepts a username of "anonymous."

Simple FTP clients are included with most network operating systems, but most of these clients (such as FTP.EXE on Windows) support a relatively unfriendly command-line interface. Many alternative freeware / shareware third-party FTP clients have been developed that support graphic user interfaces (GUIs) and additional convenience features. In any FTP interface, clients identify the FTP server either by its Ip address (such as 192.168.0.1) or by its host name.

FTP supports two modes of data transfer: plain text (ASCII), and binary. You set the mode in the FTP client. A common error when using FTP is attempting to transfer a binary file (such as a program or music file) while in text mode, causing the transfered file to be unusable.

What can a wireless accesss point use to restrict devices that can connect to it?

There are different things you can use to restrict access a wireless access point.

First one is to use so called black/white lists. Black list forbids certain MAC address to access the wireless access point everybody else is fine. White list allows only certain MAC address to access the wireless access point. Sometimes it's called MAC filter.

Second thing you can use is a wireless password. It allows to connect to your network only if you know the password. You should use WPA at least.

Do you have to have a N modem for a wireless N router?

There is no such thing as N modem. N is a type of wireless network. When modems are usually associated with wired connection. Getting back to the answer, yes you can connect N type wireless router to virtually any modem (there are some exceptions).

What IP address class does the address 128.0.31.50 belong to?

Value of first octet = 1-127 Class A

128-191 Class B

192-223 Class C

Also there are class D and E addresses, which can't be assigned to hosts.

What does Call Hold mean in Data Communications?

to place data on hold while you prepare to receive it.

What if your preferred dns server is blank?

if the preferred dns server is blank then the system takes dns as the host server and try to resolve the entries from its own cache if it is able to do it then finew other wise it will show dns error on the IE page.

same thing happens with the resources if its in the cache it will resolve the FQDN to IP othere wise will give error

What are the components of a network card?

A network card, or network adapter as it is sometimes called, allows a computer to connect to a network of other computers. These devices will usually have both a physical layer and a data link layer. Ethernet devices will most often have an 8P8C socket where the network cable can be connected.

How do you register the IP address for your remote DVR?

I dont know what service you have, but for DirecTV, go to menu>Parental, fav's & setup>highlight and click set up>go to network>advanced set-up. Here, you can enter in your IP and all that good stuff. If you have Verizon FiOS, Youl have to have a Tech come out and enter it in for you, scince they have a special access card to do this. Hope this helps and good luck!

Short notes on firewall?

A firewall is a set of related programs,located at a network gateway server,that protects the resources of a private network from users from other network (yhe term also implies the security policy that is used with the programs.)

Basically,a firewall,working closely with a router program,examines each network packets to determine whether forward it towards its destination.a firewall also includes or work with a proxy server that makes network request on behalf of workstation users.

Can some one give me the fastest dns server numbers?

preferred dns: 68.87.64.146 alternate dns: 208.67.222.222 or 208.67.220.220

Having 2 ip gateways on mikrotik?

You can have multiple gateways on Mikrotik. It can be configured to gain advantage of load balancing, where the traffic will be sent to each gateway to balance the network load. The amount of traffic flow on each gateway can be configured to match their bandwidth ratio. For example, 2:1 ratio for gateways which one have bandwidth twice the other one.

For details on configuring multiple gateways on Mikrotik, visit the related links.

What is dhcp relay service?

hope this would help: http://www.tech-faq.com/dhcp-relay-agent.shtml

What information can a network performance monitoring tool typically provide?

The more advanced solutions will provide anything your mind can dream up, but typically you're gonna look at CPU utilization, RAM utilization, Disk Space, and bandwidth over time.

What are the IEEE sublayers?

Logical Link Control (LLC) Media Access Control (MAC)