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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 the primary different between LAN and WAN?
LAN = Local Area Network (this is local, in your own computer network)
WAN = Wide Area Network (this is wide, most of the time this means the internet)
Which option sHow is how a router will route packets to a remote network?
http://wiki.answers.com/Q/Which_option_sHow_is_how_a_router_will_route_packets_to_a_remote_network"
A Port VLAN ID (pvid) is a default VLAN ID that is assigned to an access port to designate the virtual LAN segment to which this port is connected. The pvid places the port into the set of ports that are connected under the designated VLAN ID. Also, if a trunk port has not been configured with any VLAN memberships, the virtual switch's Port VLAN ID (pvid) becomes the default VLAN ID for the ports connection.
Why twisted pair cable called twisted pair?
Twisted pair comes with each pair uniquely color coded when it is packaged in multiple pairs. Different uses such as analog, digital, and Ethernetrequire different pair multiples.
Although twisted pair is often associated with home use, a higher grade of twisted pair is often used for horizontal wiring in LAN installations because it is less expensive thancoaxial cable.
The wire you buy at a local hardware store for extensions from your phone or computer modem to a wall jack is not twisted pair. It is a side-by-side wire known as silver satin. The wall jack can have as many five kinds of hole arrangements or pinouts, depending on the kinds of wire the installation expects will be plugged in (for example, digital, analog, or LAN) . (That's why you may sometimes find when you carry your notebook computer to another location that the wall jack connections won't match your plug.)
What does the term network-aware application mean and List a few examples?
Some end user applications are "Network Aware" , meaning they implement the application layer protocols and are able to communicate directly with the lower layers of the protocol stack. Email clients and web browsers are examples of these applications.
Virtual Circuit
I have a similar problem with my new laptop. In my case, I believe that it may be because I might have accidentally disabled DHCP or DNS on its wireless adapter while adding a wireless router to my local area network.
I can see all my PCs from any other in my LAN, and connect to the internet with all of them, including my laptop. But after I turn off my wireless router, I can no longer use my laptop to get to the internet through any free wi-fi hotspots the way I did even a few minutes earlier.
I am, of course, trying to resolve this problem. Stay tuned and I'll keep you informed.
Follow up:
I found excellent advice at: http://www.cabnr.unr.edu/IT/Wifi.aspx It turned out that I should not have specified a particular gateway in the settings of my wireless network card as I have enabled it for getting DHCP automatically.
Which type twisted pair cable will you use to connect router to router?
UTP (unshielded twisted pair) Cat5 or Cat6.
High level language is a problem oriented language why?
What are the advantages of transport layer?
The transport layer is typically handled by processes in the host computer operational system, and not by routers and switches. The transport layer usually turns the unreliable and very basic service provided by the Network layer into a more powerful one. In the TCP/IP model, the transport layer is responsible for delivering data to the appropriate application process on the host computers. This involves statistical multiplexing of data from different application processes, i.e. forming data packets, and adding source and destination port numbers in the header of each transport layer data packet. Some transport layer protocols, for example TCP but not UDP, support virtual circuits, i.e. provide connection oriented communication over an underlying packet oriented datagram network. A byte-stream is delivered while hiding the packet mode communication for the application processes. Finally, some transport layer protocols, for example TCP but not UDP, provides end-to-end reliable communication, i.e. error recovery by means of error detecting code and automatic repeat request (ARQ) protocol. The ARQ protocol also provides flow control, which may be combined with congestion avoidance.
Is remote infrastructure monitoring and network monitoring same?
Sort of. Remote infrastructure monitoring would fall under network monitoring. Network monitoring in general focuses on the monitoring of your network infrastructure: things like switches, routers, etc. Remote just means your monitoring it from outside the network, and is a feature available in many solutions.
A cellular WAN is the network that is used to make cellular telephone calls. If you install a cellular WAN adapter to your notebook or desktop system, you can connect to the Internet through the cellular WAN wherever a signal is available. Use this option to provide Internet access in remote areas (as long as a cellular signal is available). A cellular WAN is the network that is used to make cellular telephone calls. If you install a cellular WAN adapter to your notebook or desktop system, you can connect to the Internet through the cellular WAN wherever a signal is available. Use this option to provide Internet access in remote areas (as long as a cellular signal is available).
How is ARP reply message different from that of ARP request message?
An ARP request is a broadcast Ethernet packet, that is, a packet sent onto the local physical network that all attached devices will receive. A device sends an ARP request to make the query "what is the MAC address (a.k.a. hardware address, link layer address, etc.) of this IP address (a.k.a Layer 3 address, logical network address, etc.)?"
An ARP reply is an unicast Ethernet packet, sent from the device that currently owns the specified IP address, back to the device which sent the ARP request. That is, no other device will receive this packet. The ARP reply answers the requester's question, saying "IP address x.x.x.x is associated with MAC address xx:xx:xx:xx:xx:xx".
What tool is used to configure a DHCP scope?
For a Windows based system you use the DHCP MMC snapin console. This is installed when the DHCP server service is installed.
For Linux and Unix based systems you can edit the DHCP configuration file in /etc
Does a repeater reduce the effects of attenuation for a digital transmission signal?
It depends on the repeater. Those that receive a signal, buffer it in real time and pass it on as a digital signal will reduce the effects of attenuation. Those that receive a signal and regenerate it with a new clock signal will generally eliminate the effects of attenuation completely.
The type of repeater used depends on where and how it is used as well as the signal that is being transmitted.
