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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

IP subnet masks allows for up to 30 hosts per subnet?

255.255.255.224 will select a network of 32 IP addresses, with the lowest reserved as the network identifier, and the highest as the broadcast address, leaving 30 usable host IP addresses.

Why 4 messages are send in ping command?

Windows operating systems send four pings only, because it's normally enough to ensure that a devices is alive. Other operating systems (UNIX, Linux) send continuous pings until Ctrl-C is pressed.

Do Cat 6 cables require special RJ45 jacks or do you use the same ones as for Cat 5?

They are the same ones.

Cat 6 just use's some wires in the cable a different way. Cat5e is compatible with Cat6 systems but may not give you the most bang for your buck. They're all standard "connectors".

What is the ping command to send 9 packets as a test?

For a Microsoft Windows computer: ping -n 9
For a Linux computer: ping -c 9

Can You can share your PIN with a co-worker if they require network access?

You could share it, but it is probably against company policy (security) to do so.

How does a client notify a server that an ASCII data transfer is requested?

Packet 23 is a request from the client to start the data packet transfer from the server. The text STOR text.txt signifies this.

What device uses a mac address that starts with supermic?

00-30-48 is the OUI (object unique identifier) which belongs to:

Supermicro Computer, Inc.

2051 Junction Avenue

San Jose CA 95131

UNITED STATES

124.104.100.37 is a sample of what?

This is an IP address. IP stands for "Internet Protocol".

These types of addresses are the real ones used on the internet. The types of addresses we are used to typing (e.g. www.answers.com) are translated internally by another computer into this numeric address, that is actually used to go to a site. This translation and the numeric addresses are usually hidden to most users.

Short name for remembering the osi model layers?

There are several mnemonics you can use:

Please Do not Throw Sausage Pizza Away

or

All People Seem To Need Data Processing

And there are some others ...

What is wireless telephony application?

a collection of telephony specific extensions for call and feature control mechanism that make advanced mobile network services available to end users.

Hardware tools for a system administrator?

Hardware tools for system administrator are: Cd dvd bag crimping tool few rj45 connector Lan cable/patch cord Gloves that prevent electric shock Lan tester I/o connectors screwdriver set Diferent cable and port convertor( to usb port) Pc dust cleaner kit External cd/dvd rom & harddrive Pendtive/ flashdrive,,,etc

What is ipv4 protocol?

Well IPv4 is actually just part of the protocol TCP/IP or Transmission Control Protocol / Internet Protocol.

IPv4 is the current addressing scheme used by TCP/IP. The newer IPv6 has been rolling out to eventually replace IPv4.

Back to what it is…

IPv4 is a 32 bit binary addressing scheme by which every computer on the public Internet (most commonly HTTP) or web servers must be assigned a unique address.

The address format is comprised of four sets of 8 bit numbers, more commonly referred to as an octet. So 4 * 8 binary numbers give you a 32 bit IPv4 binary address. Because these numbers are binary each place value only has two possibilities, 0 or 1.

Because there are only around 4.3 billion addresses available with 2^32 possible IPv4 addresses a new IPv6 was developed which gives a 128 bit addresses space. This should last until there is no room to stand anywhere on the planet.

To summarize IPv4 is not a protocol but an addressing scheme that TCP/IP uses to transmit data packets over the Internet or over a private network. Every computer that is directly connected to the Internet needs a unique address. There are what is known as private IPv4 addresses, different topic, and finally IPv4 will eventually be replaced by IPv6.

What does reverse DNS lookup mean?

Reverse DNS lookup means one is trying to find the domain name associated with a particular IP address. Forward DNS lookup means one is trying to find the IP address associated with a domain name.

What is the function of SMT relay?

There is no such thing as a SMT relay. An SMTP relay, on the other hand, stands for Simple Mail Transfer Protocol. The function of a SMTP is to transfer email messages across two servers of Internet Protocol networks.

Where can one find a free DNS service online?

Free DNS services can be obtained through several different companies. OpenDNS is one of the best websites to check for local availability. DNS offers a free trial of their low cost service. DNS Dynamic can be used as a backup when other providers are experiencing heavy traffic volumes.

What is a Bast fiber used for?

A bast fiber is used for many purposes. They are used in carpets, yarn, rope, paper, etc. As well as these things, bast fibers are used in non-woven carpets and automobile door panels.

Why some employees use their own proxy server rather the organisation's proxy server?

Organizations proxy servers are probably all compered up with the entire network within its organization. When using your own personal proxy, you have the freedom, privacy, and speed for only your work and the people of your choosing.

Can you connect a wireless access point to a two-desktop wired network by cable and access a wireless laptop without connecting via the Ethernet port?

No, why would you? I suggest just buying a wireless PCI card for the two desktops. It would make life much more easier.

You can, what you need is a wireless router... this will allow you to have approximatly 4 ethernet ports and wireless access to your network, but look in your manual to make sure you encrypt the data so as to protect from wireless predators...

How can you share a network printer on Windows 98 which displays status 'printer not found' after installing it on Server 2003?

First I would try to reinstall the printer software and setup the sharing properties. Or just install the printer to the server and distribute the sharing from there...