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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 is a router used in a network?
A router is used to route data packets between two networks. It reads the information in each packet to tell where it is going. If it is destined for an immediate network it has access to, it will strip the outer packet, readdress the packet to the proper ethernet address, and transmit it on that network.
IPv4 goes from 0.0.0.0 to 255.255.255.255. There is a theoretical maximum of 4,294,967,296 unique addresses available, not including those behind NAT.
19 What is the listening port for windows xp remote desktop?
The default listening ports for Windows XP Remote Desktop are TCP port 3389 and UDP port 3389. Remote Desktop Protocol is available for several versions of Microsoft Windows as well as some alternate OS offerings.
Where is the bus topology commonly found this day?
The answer to this question is surprisingly easy! Cable internet (e.g. Comcast) is a current day example of a bus network. All the users for one segment of the network reside on a shared line. A t-style connection is made from this main feed line to each users home. Don't misunderstand that the actual backbone of the cable network is NOT the same as a traditional bus network. Nor does the local loop portion suffer from all of the same problems a bus network of the past did. For example in a traditional bus network, if you disconnected a workstation connection (without adding a terminator) that entire segment of the network would go down. That obviously is not the case with cable. If you unplug the cable from your modem (csu/dsu) your entire neighborhood does not go offline! All that said; Cable is the closest thing logically/physically to a bus network that is still functionally implemented today. A bus network could also still be found in the traditional sense with an as400 system however this is likely not newly implemented anymore. These services would ride on cat-5 to standard PC rather than to a "dumb-terminal". There are however still Bus/Mainframe networks in existence from back in the day believe it or not.
What companies use both intranets and extranets?
Companies which need to allow access to outside parties, such as vendors.
Where can someone purchase a 50 foot Ethernet Cable?
100 foot cable for computers can be bought at universally known online platforms like Amazon. RiteAV is a highly ranked provider of computer cables. The kind of cable also depends on the part of the computer one needs it for.
Does a strong properly configured firewall eliminates the need what?
Having a strong properly configured firewall will eliminate the need for an anti-virus program. A firewall is designed to block viruses.
You need to view at network traffic name a few tools?
- Etheral
- Wireshark
- Fluke OptiView Suite
- Sitrace
- Iris Network Analyzer
Hope these will work, as Etherral and Wireshark are great and Fluke OptiView is outstanding, in reporting as well.
Regards,
Rizwan Ranjha
Network Engineer
Like every home in the real world has his own address, every computer in the Internet has it's own address - an IP address.
Just like when you can't receive anything via mail if nobody knows your address, nobody can send you any information (like e-mails) if nobody knows your computer's address.
If you do not know your IP address, see your system's properties.
Hope you find this useful.
Networks are classified as either local area networks or wide area networks?
Comparison chart
Improve this chart
LAN
WAN
Data transmission Error:
Experiences fewer data transmission errors
Experiences more data transmission errors as compared to LAN
Data transfer rates:
LANs have a high data transfer rate
WANs have a lower data transfer rate as compared to LANs
Technology:
Tend to use certain connectivity technologies, primarily Ethernet and Token Ring
WANs tend to use technology like MPLS, ATM, Frame Relay and X.25 for connectivity over the longer distances
Connection:
one LAN can be connected to other LANs over any distance via telephone lines and radio waves
Computers connected to a wide-area network are often connected through public networks, such as the telephone system. They can also be connected through leased lines or satellites
speed:
high speed(1000mbps)
less speed(150mbps)
Maintenance costs:
Because it covers a relatively small geographical area, LAN is easier to maintain at relatively low costs.
Maintaining WAN is difficult because of its wider geographical coverage and higher maintenance costs.
Fault Tolerance:
LANs tend to have less problems associated with them, as there are a smaller amount of systems to deal with.
WANs tend to be less fault tolerant. as it consists of a large amount of systems there is a lower amount of fault tolerance.
Example:
Network in an organization can be a LAN
Internet is the best example of a WAN
Geographical spread:
Have a small geographical range and do not need any leased telecommunication lines
Have a large geographical range generally spreading across boundaries and need leased telecommunication lines
Set-up costs:
If there is a need to set-up a couple of extra devices on the network, it is not very expensive to do that
In this case since networks in remote areas have to be connected hence the set-up costs are higher
Ownership:
Typically owned, controlled, and managed by a single person or organization
WANs (like the Internet) are not owned by any one organization but rather exist under collective or distributed ownership and management over long distances
Definition:
LAN (Local Area Network) is a computer network covering a small geographic area, like a home, office, schools, or group of buildings.
WAN (Wide Area Network) is a computer network that covers a broad area (e.g., any network whose communications links cross metropolitan, regional, or national boundaries over a long distance
Components:
layer 2 devices like switches, bridges. layer1 devices like hubs , repeaters
Layers 3 devices Routers, Multi-layer Switches and Technology specific devices like ATM or Frame-relay Switches etc.
A local area network (LAN) exists in a house or a university campus, while a wide area network (WAN) exists over many office buildings separated by a vast distance. The office buildings in a WAN may be in different countries or even continents. For example, the headquarters building may be in the USA, the regional office building may be in the UK, and the branch office building may be in India. The workers in the three buildings use WAN to collaborate with each other. The Internet can also be considered as a WAN. Let's take a look at the LAN vs. WAN comparison check.
Difference between LAN and WAN
The other difference between LAN and WAN, is the speed of thenetwork. The maximum speed of a LAN can be 1000 megabits per second, while the speed of a WAN can go up to 150 megabits per second. This means the speed of a WAN, is one-tenth of the speed of a LAN. A WAN is usually slower because it has lower bandwidth.
Computers in a LAN can share a printer, if they are all in the same LAN. On the other hand, a WAN cannot share a printer, so a computer in one country cannot use a printer in another country. A LAN does not need a dedicated computer to direct traffic to and from the Internet, unlike a WAN that needs a special-purpose computer, whose only purpose is to send and receive data from the Internet.
Another LAN vs. WAN comparison is the cost of the network. A WAN is more expensive than a LAN. It is easier to expand a LAN than a WAN. The equipment needed for a LAN is a network interface card (NIC), a switch and a hub. On the other hand, the equipment needed to connect a WAN to the Internet is a modem and a router. The modem may be a cable modem or a DSL modem that is connected to a wall jack, while the router should be configured so that it can handle the packets traveling between the WAN and the Internet.
In LAN vs. WAN, there is a difference in the networking standard used. A LAN uses the Ethernet standard, while a WAN uses the T1 standard. Before Ethernet, the protocols used for LAN were Attached Resource Computer Network (ARCNET) and Token Ring. The protocols used for WAN are Frame Relay and Asynchronous Transfer Mode (ATM). Another protocol for WAN is Packet over SONET/SDH (PoS), where SONET stands for Synchronous Optical Networking and SDH stands for Synchronous Digital Hierarchy. The first WAN protocol was X.25, while an advanced WAN protocol is Multiprotocol Label Switching (MPLS). The hardware in a LAN is connected with 10Base-T cable connectors, while a WAN is connected via leased lines or satellites.
Here is an explanation of LANs and WANs. A LAN is easy to set up, as you need to slip the NIC into the PCI slot (for desktop computers) or PCMCIA slot (for laptop computers). You also need to install the driver for the NIC. The NIC can be connected to the network using the RJ45 port.
On the other hand, a WAN is very difficult to set up. There is often an appliance to optimize the WAN. There is also a device to cache WAN data, so workers in the branch office can quickly access documents. The router also has Quality of Service (QoS) built in, so that it gives priority to certain kinds of traffic.
There are various topologies available in LAN and WAN networking. The most common topologies in LAN and WAN networks are ring and star. The ring topology is a network in which every node (every computer) is connected to exactly two other nodes. The star topology is a network in which all the nodes (called leaf nodes or peripheral nodes) are connected to a central node.
What is a significant advantage to using an SFP interface on a router rather than an on-board NIC?
the sfp will be capable of higher throughputs
Where is the computer IR port located on a computer?
the ir port on a computer looks like a small smoked glass window a lot of lap tops have these but they might not have infrared installed if you go to control panel you should see if you have it installed
Some computers will have an IR controller integrated in to the motherboard, but not the actual IR port. The computer will still think that you have an IR port and therefor it will display it as an option for communication. If this is the case, you should be able to buy an IR port and install it on your computer.
Infared networking was typically used to create wireless networks in offices and required line of sight to the IR hub (typically mounted on a ceiling). It has been replaced by the 802.11 standard in favor of its larger bandwidth, ease of implementation and its ability to transmit through objects.
What are the characteristics of OSPF areas?
It provides fast network convergence.
It transmits route updates throughout a network using IP-based multicasting.
What is the ip address 1270.0.1?
127.0.0.1 is a special IP address used to 'loopback' or to talk to your own computer. Anything that is addressed to 127.0.0.1 never leaves your computer, but can be used to test services that are running on your own computer.
What is the function of network protocols?
Networking protocols, such as TCP/IP, enable computers to exchange data with each other in a meaningful, organized, and efficient way. Computer protocols are similar to human language - if you speak English and you meet someone who speaks German, the protocols (languages) you use to exchange information are incompatible with each other. It is only when you both speak the same language that you can understand each other. Similarly, computers rely on protocols to ensure each computer "understands" what the other computer is sending it. Just as with humans, both computers must use the same protocol if they are to exchange information with each other successfully. Follow the Related Link below to view a Wikipedia article on this topic.
How does a bridge device improve performance on an Ethernet network?
how does each device work? what are the advantages of each? 1.switch 2.hub 3.bridge
What type of cable should be used to connect switch to hub?
You need to use a straight type of connection. 568A or 568B depending which type your network is using.
What are disadvantages of client server networks?
You need to have a server, and if it's a dedicated machine with server software it usually costs significant amount of money. Also server OSes are more complicated then client oriented and require special training to work with properly. Also if your server is done you can't use your information.
A network is a grouping of computers all connected by some media (wires, fiber optics, coax cable etc). On the Internet, every computer has a unique address called an IP (internet protocol) address - much the same way everyone has a unique phone number.. That address has 4 numbers or octets, separated by a decimal. For example 192.34.50.200. Each number is between 1 and 255. The first 3 octets are network designators and the fourth is a node, or your PC. If you do the math that means over 4 billon nodes can be addressed (254x 254 x 254x 254)
Domains are groups of PCs on the same network and are a method to isolate communications between the members in the domain and the other data traffic.. Anyone in a domain can communicate with each other and out bound, however PCs not defined in the domain can not communicate with those in the domain.
Users need to be trained only to use client
What are the basic components of a computer network?
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.
What is your gateway addresss and subnet mask?
Sorry there's not enough information to tell. These are separate pieces of information besides the IP address and can't be determined from the IP address alone. Ask your network administrator.
Server usually listens on port 80?
Conventionally, an HTTP server listens on port 80. Regardless of the brand of web server that you are running, the server will typically listen for HTTP traffic on port 80 and HTTPS traffic on port 443.
