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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
Why is it that voice and video traffic is often sent over TCP rather than UDP in todays Internet?
This is because some firewalls give less preference to UDP traffic. So its kind of a hack to get more effective bandwidth.
What is a NIC and what is it used for?
NIC stands for Network Interface Card. It is connected to the motherboard of the computer. It provides the device with a MAC address and allows a device to access a computer network such as the internet.
All IPv4 IP addresses can be divided into two major groups: global, or public, or external - this group can also be called 'WAN addresses' — those that are used in the Internet, and private, or local, or internal addresses — those that are used in the local network (LAN).
Deference between cat5 and cat6?
The most obvious difference is their transfer capability. CAT5 has four pairs of twisted copper wire and supports up to 100m of Fast Ethernet (100Mbps) transfers. Although CAT5 has four twisted pairs, it only makes use of two pairs. CAT6 also has four pairs of twisted copper wire which supports Gigabit Ethernet (1000 Mbps) of up to 100m. Unlike CAT5, CAT6 takes advantage of all four pairs. CAT6 has a 2x transfer rate compared to CAT5 but due to the higher price tag of CAT6.
standard for data transmission in a local area network that can extend in range up to 200 kilometers (124 miles). Although FDDI logical topology is a token ring network, it does not use the IEEE 802.5 token ring protocol as its basis; instead, its protocol is derived from the IEEE 802.4 token bus timed token protocol. In addition to covering large geographical areas, FDDI local area networks can support thousands of users. As a standard underlying medium it uses optical fiber, although it can use copper cable, in which case it may be refer to as CDDI. FDDI uses a dual-attached, counter-rotating token ring topology.
FDDI was considered an attractive campus backbone technology in the early to mid 1990s, but FDDI has since been effectively obsoleted by fast Ethernet and, since 1998, by Gigabit Ethernet due to their speed, lower cost, and ubiquity.
FDDI, as a product of American National Standards Institute X3T9.5 (now X3T12), conforms to the Open Systems Interconnection (OSI) model of functional layering of LANs using other protocols. FDDI-II, a version of FDDI, adds the capability to add circuit-switched service to the network so that it can also handle voice and video signals. Work has started to connect FDDI networks to the developing Synchronous Optical Network SONET.
A FDDI network contains two token rings, one for possible backup in case the primary ring fails. The primary ring offers up to 100 Mbit/s capacity. When a network has no requirement for the secondary ring to do backup, it can also carry data, extending capacity to 200 Mbit/s. The single ring can extend the maximum distance; a dual ring can extend 100 km (62 miles). FDDI has a larger maximum-frame size than standard 100 Mbit/s Ethernet, allowing better throughput.
Designers normally construct FDDI rings in the form of a "dual ring of trees" (see network topology). A small number of devices (typically infrastructure devices such as routers and concentrators rather than host computers) connect to both rings - hence the term "dual-attached". Host computers then connect as single-attached devices to the routers or concentrators. The dual ring in its most degenerate form simply collapses into a single device. Typically, a computer-room contains the whole dual ring, although some implementations have deployed FDDI as a Metropolitan area network
A physical port, as opposed to a virtual or logical port is an interface on a computer into which you can insert a connector for a device.
What is the term for a hub used on a token ring network?
Figure it out your selves If you are doing a National Diploma in IT then you should know this
What is unrestricted simplex protocol?
modem means MOdulator and DEModulator. The modem is a converter of analog to digital and digital to analog.010101010 to [[User:117.200.180.23|117.200.180.23]] 09:34, 27 Apr 2009 (UTC)[[User:117.200.180.23|117.200.180.23]].and [[User:117.200.180.23|117.200.180.23]] 09:34, 27 Apr 2009 (UTC)[[User:117.200.180.23|117.200.180.23]] 09:34, 27 Apr 2009 (UTC) to 10101010101.
What part of the pstn acts as a bottleneck for data throughput?
im pretty sure its the local loop since that is the only part that doesnt use fiber optics or copper wire twisted pair
What is the purpose of the token frame in a token ring network?
To indicate to the network that a particular node is about to transmit data
Is 192.168.9.64 26 a valid network address for IPv4?
Yeah it is!
Here is why
You have the subnet mask of 26 bits. So its becomes 255.255.255.192.
So the first three octets will be in the network address for sure. So we are done upto 192.168.9.x. In the last octet you have 2 bits on from the left, i.e.
128 64 32 16 8 4 2 1
1 1 0 0 0 0 0 0
You see that the bit corresponding to 64 is 1. That means it can come in the network address.:)
What is the different between Half Duplex and Full Duplex?
Half Duplex- half duplex device let you sen and receive or channel can either sending or receiving at a time but only one-way at a time.he used a walkie-talkie.
Full Duplex- Channel can both send and receive at a time.
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How do you create a movie server using High Performance Computing?
High Performance Computing (HPC) is a necessity in industries requiring the quick assessment and computation of massive amount of data. However, technological advancements have made it possible to convert HPC to a more accessible format, usable on a wider scale. The result has been the application of HPC in a variety of contexts, including the creation and playback of movies.
Although the possibilities are endless when HPC is combined with movie-making, interested parties continue to find the process complex and overly frustrating. Before movie-related tasks can be accomplished with the use of HPC, a movie server must be set up. Those with HPC servers such as Windows HPC will find solutions in the movie-making workflow in the form of such applications as Interactive Media Manager and other related programs. Also available are encoders, which allow rendered frame sequences to be split up and converted to a more efficient digital format. Again, this process is easy to complete with the download of applications such as the open source HPC video encoder.
DHCP work at which layer of osi?
It works on the "application layer", because the data is handled at that layer. However, the information it transfers (distribution of IPs) transcends "layers". BTW, It uses UDP (not TCP), at the "transport layer" on ports 67 and 68.
Edit - "Application" is 7 on the OSI model I believe, but often referred to as a different number with different models
