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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
What is bluetooth 2.1 plus edr?
this is an advanced technology provided by first from nokia... this provides faster service through bluethooth . and edr is enhanced data rate or exchange data rate...
What are the five aspects of the information network you will focus on in this course?
- Devices th make up the network.
- Media that connect the devices.
- Messages that are carried across the network.
- Rules and processes that govern network communications.
- Tools and commands for construction and maintaining networks.
What is the public switched telephone network?
PSTN (public switched telephone network) is the world's collection of interconnected voice-oriented public telephone networks, both commercial and government-owned. It's also referred to as the Plain Old Telephone Service (POTS). It's the aggregation of circuit-switching telephone networks that has evolved from the days of Alexander Graham Bell ("Doctor Watson, come here!"). Today, it is almost entirely digital in technology except for the final link from the central (local) telephone office to the user.
In relation to the Internet, the PSTN actually furnishes much of the Internet's long-distance infrastructure.
A domestic telecommunications network usually accessed by telephones, key telephone systems, private branch exchange trunks, and data arrangements.
Ø In North America, you have access to the Public Switched Telephone System (PSTN). The term PSTN used to refer to the public communication system that provides local, extended local and long distance telephone service to the majority of the United States and North America. This system is made available to the public through a group of common communications carriers such as American and Canadian phone companies who have agreed to exchange calls and connections on behalf of their subscribers as mandated by international law and the laws of the country in which they do business and and provide telephone service. Anyone who subscribes to this public service may make calls to anyone else who has purchased access to the phone system through any other carrier.
Routing calls requires multiple switching offices. The phone number itself is a coded map for routing the call. In the United States, for example, we have 10-digit phone numbers.
- The first three digits are the area code or national destination code (NDC), which helps route the call to the right regional switching station.
- The next three digits are the exchange, which represents the smallest amount of circuits that can be bundled on the same switch. In other words, when you make a call to another user in your same exchange -- maybe a neighbor around the corner -- the call doesn't have to be routed onto another switch.
- The last four digits of the phone number represent the subscriber number, which is tied to your specific address and phone lines.
Within a company or larger organization, each employee or department might have its own extension. Extensions from the main phone number are routed through something called a private branch exchange (PBX) that operates on the premises.
To make an international call requires further instructions. The call needs to be routed through your long-distance phone carrier to another country's long-distance phone carrier. To signal such a switch, you have to dial two separate numbers, your country's exit code (or international access code) and the corresponding country code of the place you're calling.
Almost all exit codes are either 00 or 011, although there are a few exceptions like Cuba (119) and Nigeria (009). Country codes are one- to three-digit prefixes that are assigned to specific countries or groups of countries. For example, the country code for the United States is 1, but the United States shares that country code with Canada and several smaller island nations like Jamaica, Puerto Rico and Guam. The country code for Mexico is 52 and Saudi Arabia is 966. Here's a full list of exit and country codes.
How do you reconnect your lan computer if it indicates it is unplugged but that is not the case?
There may be several things to check:
Miscunfigured system:
- Try to deactivated your LAN connection and re-activated it (or reboot the system, the results would be the same: the driver gets reset)
- Check the setting of your connection - DHCP on/off? When no DHCP -> IP, subnet and gateway (for example: 192.168.0.5, 255.255.255.0, 192.168.0.1)
- Shut down firewalls (Windows xp offers a build-in firewall which might be activated be a Microsoft security patch)
- Keep the connection as simple as possible to spot the point of error.
Broken hardware:
- check if there are any LED signals at the network port on your computer, most network ports show two LEDs above the RJ45 plugin, one should be green all the time, the other one will flash when there is traffic on the line. When there is no LED lit, there is no (electrical) connection between the Hub/Switch and your computer.
- Try exchanging the patch cable
- Try resetting the Hub/switch
- Last shot: Try reinstalling your network driver (it is unlikely but might be a driver problem)
A domain name is the text name that is linked to the numeric IP address of a computer on the internet. It is what you type in the browser's address bar to go to a specific website. It identifies a particular site. An example of a domain name is Answers.com. A domain name must be unique. Internet users access pages of your website using your web address. The domain name is the heart of that web address.
.com is the most popular domain extension (the 2nd half of a domain name). .net, .org, .info, .us, .biz, .tv, .me, and .co are some of the other TLDs (top-level domains) that can be registered.
A domain name is a name given to a web address. Just as our homes have street addresses, websites have addresses too. They are in the form of numeric digits and are called IP addresses. The domain is an easier to remember name given to whatever IP address, or in some cases, a group of rotating addresses.
If you have a website, others need a way to be able to find it. So the domain is a way to help others find your site. The name generally has something to do with the content, and it is easier to remember and to search than if it was a string of numbers. So you would need to purchase a domain name, and that is not a difficult process if you stick to some basic principles. If you do good research, use good judgment that the domain name will identify with your site, it is very likely that you will have a successful domain.
You would would start by picking the right domain name for your site, but you should choose carefully. You should select a term people will use to search for your site. Your brand name, your personal name, the topic, or the subject matter are obvious choices. If you are selling a product, you need a domain name that reflects well on your company and products.
When you check into buying a domain name, you should find out how much a domain name is going to cost, especially the domain name you already have in mind. You should be able to successfully register your domain name for $10 or less per year. While you can register a domain for as long as you see fit, it is always advisable to make a long term commitment and buy a domain name for at least 5 years.
It is probably best to choose a a domain that consists of letters although you can use numbers and hyphens. Using mixtures of numbers, letters, and hyphens makes your domain to become hard to remember and easier to type in the wrong site. So you could be pointing potential clients to other sites with similar domain names. You would not want your prospective clients to make a typo and end up at a competitor's site. While you are allowed domain name with up to 67 characters, it is best to choose as short of a name as you can. That makes it easier to remember.
Another purpose for buying domain names is for future resale. Regardless of whether you are buying a domain name to use for a business or other site, or if you are trying to make a business buying and selling domain names, most of the same guidelines apply to both. You need to do research before buying any domain name, regardless of the reason. Make sure that the name you choose fits whatever purpose. It is good to know that most companies that sell domain names also provide other services as well, such as web hosting and domain buying. So if you do proper research, you can do most of your shopping in one place.
Does BOOTP support subnetting?
Yes and No - BOOTP is used in situations where the device needs an IP address and can be matched by its MAC address. Therefore, a client receives an IP address that was matched by the MAC address. That IP address may be part of a subnet, or it may not be.
The protocol itself doesn't care if there are subnets or not. It gives out an IP address, which may be subnetted.
See the related link for an example of a BOOTP entry.
What is theDifference between connection and communication?
communication is talking and connection is starting to know one an other
They can be contacted anytime, thus enabling the organisation to get their services at any time. All Employees, if provided the mobile phones, feel the team experience. The bond between them becomes more close. The problems of individual employees felt at the time of executing the task of the organisation can be discussed with others, thus better work. Social networking becomes more powerful, which in turn enables better output.
What does the acronym WAN stand for?
Wide Area Network
It describes a type of computer inter-connection system, one that crosses local, regional and national boundaries.
For more information, see Related links below this box.
Which class ip address uses 24 bits for the network id and 8 bits for the host id?
IP Address Class
Total # Of Bits For Network ID / Host ID
First Octet of IP Address
# Of Network ID Bits Used To Identify Class
Usable # Of Network ID Bits
Number of Possible Network IDs
# Of Host IDs Per Network ID
Class A
8 / 24
0xxx xxxx
1
8-1 = 7
27-2 = 126
224-2 = 16,277,214
Class B
16 / 16
10xx xxxx
2
16-2 = 14
214 = 16,384
216-2 = 65,534
Class C
24 / 8
110x xxxx
3
24-3 = 21
221 = 2,097,152
28-2 =
Which situation Address Resolution Protocol used?
ARP used for resolving mac address from ip address, say one client want to communicate with another and the sender knows only its destination IP address. For communication it requires the physical address of the destination, thus sender uses ARP protocol to resolve the physical address of the destination from ip address by sending arprequest to destination system.
What is the maximum recommended distance between a wireless device and its wireless access point?
300 feet
What is the components required to meet a network specification?
The following components required to meet a network specification.
1. The network devices like switch, router, cables and other all network devices.
That would render most protocols useless. TCP provides the reliability that is required for many applications.
Which two techniques help to reduce overhead in 802.11n wireless transmission?
Which two techniques help to reduce overhead in 802.11n wireless transmission? B - Frame Aggregation and E - channel bonding
Network+ Guide to Networks
Chapter 8
Pages 380 - 281
Ping is a special command line utility which allows to check accessibility of particular hosts. It uses ICMP protocol and because many online services block it, the utility not always provides correct results.
Such specialists are usually paid to do work for others. They may have signed a contract stating that the work they get paid to do doesn't belong to them; even if they didn't sign such a contract, it is usually implicit. For more information, read the Wikipedia article entitled "Work for hire".
What file system limits file names to eight character in length?
That is the original FAT (file allocation table) system, also known as FAT12 and FAT16. FAT32 keeps the 8.3 structure (8 name characters and a 3 character extension) but also adds LFN (long filename) support.
Where can you find the best network tools?
Network tools can be found in a number of different places. Solarwinds or Sectools are two options, with many more to choose from. Before buying anything, make sure you know all the information.
