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What else can I help you with?
Max speed of coax?
Coax cable is OK for R.F. up to several gigahertz, over medium to short runs. For data, we went to twisted-pair with 100 megabit Ethernet, and twisted-pair is now used in 10 gigabit Ethernet. So... using Nyquist, you can probably use coax cable up to gigabit speeds over medium-short distances, but I'm not aware of anyone doing it. Maybe try a google search.
What is ARCnet?
ARCNET (also CamelCased as ARCnet, an acronym from Attached Resource Computer NETwork) is a local area network (LAN) protocol, similar in purpose to Ethernet or Token Ring. ARCNET was the first widely available networking system for microcomputers and became popular in the 1980s for office automation tasks. It has since gained a following in the embedded systems market, where certain features of the protocol are especially useful. Original ARCNET used RG-62/U coax cable of 93Ω impedance and either passive or active hubs in a star-wired bus topology, a layout eventually copied by modern twisted pair Ethernet LANs. At the time of its greatest popularity ARCNET enjoyed two major advantages over Ethernet. One was the star-wired bus; this was much easier to build and expand (and was more readily maintainable) than the clumsy linear bus Ethernet of the time. Another was cable distance - ARCNET coax cable runs could extend 2000 feet (610 m) between active hubs or between an active hub and an end node, while the RG-58 (50Ω) 'thin' Ethernet most widely used at that time was limited to a maximum run of 600 feet (183 m) from end to end. Of course, ARCNET required either an active or passive hub between nodes if there were more than two nodes in the network, while thin Ethernet allowed nodes to be spaced anywhere along the linear coax cable, but the ARCNET passive hubs were very inexpensive. Passive hubs limited the distance between node and active hub to 100 feet (30 m). More importantly, the "interconnected stars" cabling topology made it easy to add and remove nodes without taking the whole network down, and much easier to diagnose and isolate failures within a complex LAN. To mediate access to the bus, ARCNET uses a token passing scheme, a bit different from that used by Token Ring. When peers are inactive, a single "token" message is passed around the network from machine to machine, and no peer is allowed to use the bus unless it has the token. If a particular peer wishes to send a message, it waits to receive the token, sends its message, and then passes the token on to the next station. Because ARCNET is implemented as a distributed star, the token cannot be passed machine to machine around a ring. Instead, each node is assigned an 8 bit address (usually via DIP switches), and when a new node joins the network a "reconfig" occurs, wherein each node learns the address of the node immediately above it. The token is then passed directly from one node to the next. Historically, each approach had its advantages: ARCNET added a small delay on an inactive network as a sending station waited to receive the token, but Ethernet's performance degraded drastically if too many peers attempted to broadcast at the same time, due to the time required for the slower processors of the day to process and recover from collisions. ARCNET had slightly lower best-case performance (viewed by a single stream), but was much more predictable. ARCNET also has the advantage that it achieved its best aggregate performance under the highest loading, approaching asymptotically its maximum throughput. While the best case performance was less than Ethernet, the general case was equivalent and the worst case was dramatically better. An Ethernet network could collapse when too busy due to excessive collisions. An ARCNET would keep on going at normal (or even better) throughput. Throughput on a multi-node collision-based Ethernet was limited to between 40% and 60% of bandwidth usage (depending on source). Although 2.5 Mbit/s ARCNET could at one time outperform a 10 Mbit/s Ethernet in a busy office on slow processors, ARCNET ultimately gave way to Ethernet as improved processor speeds reduced the impact of collisions on overall throughput, and Ethernet costs dropped. In the early 1980s ARCNET was much cheaper than Ethernet, in particular for PCs. For example in 1985 SMC sold ARCNET cards for around $300 whilst an Ungermann-Bass Ethernet card plus transceiver could cost $500. Another significant difference is that ARCNET provides the sender with a concrete acknowledgment (or not) of successful delivery at the receiving end before the token passes on to the next node, permitting much faster fault recovery within the higher level protocols (rather than having to wait for a timeout on the expected replies). ARCnet also doesn't waste network time transmitting to a node not ready to receive the message, since an initial inquiry (done at hardware level) establishes that the recipient is able and ready to receive the larger message before it is sent across the bus. One further advantage that ARCNET enjoyed over collision-based Ethernet is that it guarantees equitable access to the bus by everyone on the network. Although it might take a short time to get the token depending on the number of nodes and the size of the messages currently being sent about, you will always receive it within a predictable maximum time; thus it is deterministic. This made ARCNET an ideal real-time networking system, which explains its use in the embedded systems and process control markets. Token Ring has similar qualities, but is much more expensive to implement than ARCNET. In spite of ARCNET's deterministic operation and historic suitability for real-time environments such as process control, the general availability of switched gigabit Ethernet and Quality of service capabilities in Ethernet switches has all but eliminated ARCNET today. At first the system was deployed using RG-62/U coax cable (commonly used in IBM mainframe environments to connect 3270 terminals and controllers), but later added support for twisted-pair and fibre media. At ARCNET's lower speeds (2.5 Mbit/s), Cat-3 cable is good enough to run ARCNET. Some ARCNET twisted-pair products supported cable runs over 2000' on standard CAT-3 cable, far beyond anything Ethernet could do on any kind of copper cable. (Indeed, ARCNET has been demonstrated running successfully across coat hanger wire!)[citation needed] In the early 90s, Thomas-Conrad Corporation developed a 100 Mbit/s topology called TCNS based on the ARCNET protocol, which also supported RG-62, twisted-pair, and fiber optic media. TCNS enjoyed some success until the availability of lower-cost 100 Mbit/s Ethernet put an end to the general deployment of ARCNET.
What are the main components of network the advantages of networks?
The basic components of a network include: modem or NIU, router, switches, and patch panels that provide connectivity to each of your network drops.Modem - Depending on your internet service provider, you will have an HFC modem, a T1 NIU, or another provider specific equipment. This piece of equipment talks to the providers network and transports your data.Router - The router is what controls your internal network and it makes sure the data gets to the proper location without interference or collisions. Every computer, printer, server, and other devices that will connect to your network need an address so the router knows where to send the data. The address that every device is assigned is known as an IP address, which the router assigns.Switches - Switches distribute network access to all of the work stations, they function like a big hub. They typically come in sizes ranging from 4 port, 8 port, all the way up to 48 port. This is how network engineers are able to provide internet access to a huge number of workstations.Patch Panels - These are just termination points for every network line that runs to the actual work stations. The network line from the work station comes into the back of the panel, and is punched down to a 110 block on the back side. The front side of the panel consists of RJ45 Ethernet female jacks, which allow us to use much smaller patch cables to connect the lines from the patch panel to the switches.
Which OSI layer is responsible for building and tearing down packets?
Every layer add its relevant data, (required for various typical operations such as identify packet location, sender/ receiver addresses, App. ports, etc) along with actual data to transmit. Where as, every activities related to Packet is typically being performed in Network Layer/ IP layer.
Linda has been assigned the job of connecting five computers to a network The room holding the five computers has three network ports that connect to a switch in an electrical closet down the hall?
Im assuming you are referring to the thinking critically question of chapt 17 for A+. The answer is to try one of the nonworking PCs in a wall jack of one of the working PCs. if it works, then its the cable. Try using a patch Cable
Why main switches lift up and others down?
Main switches typically lift up to turn on because this motion is more intuitive and easier to identify as an "on" position. Other switches may be designed to move downward to differentiate them from main switches and provide a clear distinction between different functions or circuits.
What is a computer internet HUB?
A common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets. An Ethernet hub or concentrator is a device for connecting multiple twisted pair or fiber optic Ethernet devices together, making them act as a single segment. Hubs work at the physical layer (layer 1) of the OSI model. The device is thus a form of multiport repeater. Ethernet hubs are also responsible for forwarding a jam signal to all ports if it detects a collision. Historically, the main reason for purchasing hubs rather than switches was price. This has largely been eliminated by reductions in the price of switches, but hubs can still be useful in special circumstances: * A protocol analyzer connected to a switch does not always receive all the desired packets since the switch separates the ports into different segments. Connecting the protocol analyzer to a hub allows it to see all the traffic on the segment. (Expensive switches can be configured to allow one port to listen in on traffic on another port. However, these cost much more than a hub.) * Some computer clusters require each member computer to receive all of the traffic going to the cluster. A hub will do this naturally; using a switch requires implementing special tricks. * When a switch is accessible for end users to make connections, for example, in a conference room, an inexperienced or careless user (or saboteur) can bring down the network by connecting two ports together, causing a loop. This can be prevented by using a hub, where a loop will break other users on the hub, but not the rest of the network. (It can also be prevented by buying switches that can detect and deal with loops, for example by implementing the Spanning Tree Protocol.) * A cheap hub with a 10BASE2 port is probably the cheapest and easiest way to connect devices that only support 10BASE2 to a modern network (cheap switches don't tend to come with 10BASE2 ports). The same goes for linking in an old thicknet network segment using an AUI port on a hub (individual devices that were intended for thicknet can be linked to modern Ethernet by using an AUI-10BASE-T transceiver). A common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets. An Ethernet hub or concentrator is a device for connecting multiple twisted pair or fiber optic Ethernet devices together, making them act as a single segment. Hubs work at the physical layer (layer 1) of the OSI model. The device is thus a form of multiport repeater. Ethernet hubs are also responsible for forwarding a jam signal to all ports if it detects a collision. Historically, the main reason for purchasing hubs rather than switches was price. This has largely been eliminated by reductions in the price of switches, but hubs can still be useful in special circumstances: * A protocol analyzer connected to a switch does not always receive all the desired packets since the switch separates the ports into different segments. Connecting the protocol analyzer to a hub allows it to see all the traffic on the segment. (Expensive switches can be configured to allow one port to listen in on traffic on another port. However, these cost much more than a hub.) * Some computer clusters require each member computer to receive all of the traffic going to the cluster. A hub will do this naturally; using a switch requires implementing special tricks. * When a switch is accessible for end users to make connections, for example, in a conference room, an inexperienced or careless user (or saboteur) can bring down the network by connecting two ports together, causing a loop. This can be prevented by using a hub, where a loop will break other users on the hub, but not the rest of the network. (It can also be prevented by buying switches that can detect and deal with loops, for example by implementing the Spanning Tree Protocol.) * A cheap hub with a 10BASE2 port is probably the cheapest and easiest way to connect devices that only support 10BASE2 to a modern network (cheap switches don't tend to come with 10BASE2 ports). The same goes for linking in an old thicknet network segment using an AUI port on a hub (individual devices that were intended for thicknet can be linked to modern Ethernet by using an AUI-10BASE-T transceiver).
How do you get all of the light switches to be in the down position for off when you have more than one switch for them?
Three way switches do not have a up-on down-off position. With the lights off, reposition the switches so that the handles are all down. This is the start position and depending on how you enter the room and turn on the lights certain switches will be left up when you leave the room. That is just the design of the switches and for the asthetics of the look, all handles down the lights will be out.
What order do you position the switches on 24 carrot island?
The two outside switches go halfway down, and the middle one all the way down.
2000 ford explorer the windows all go down from the drivers side but none of the others will from the other switches?
Driver's "Lock" switch broken or in locked position?
How do you instruct mac book pro to use Ethernet not airport?
Open System Preferences and click on the Network icon. Ethernet will probably be listed in the left hand pane, if not click the + button at the bottom and add Ethernet from the options in the Interface drop down menu. Select Ethernet in the left hand pane. If it is not working click the Advanced... button and then the Ethernet tab on the right. Select Automatically from the Configure drop down menu. If it is still not working you will need to manually enter the settings required for the network you are joining.
Write down the use of ephemeral ports?
The ephemeral or scratch ports can be used for any purpose. They are transient and temporary, and any process may use them for whatever reason they want. These ports do not have a specific or reserved purpose in what they do.
What is the purpose of an Ethernet punch down block and how is it used in networking installations?
An Ethernet punch down block is used to terminate and organize Ethernet cables in networking installations. It helps to create a neat and structured connection point for the cables, making it easier to manage and troubleshoot network connections. The punch down block is typically mounted on a wall or rack, and cables are punched down into the block using a tool to secure the connections. This helps ensure reliable and efficient network communication.
2003 Expedtion the windows will not roll down you have replaced fuse?
Check the switches....
Where is the fuse box on a 1980 Corvette?
Down by where the dimmer switches were once located.
Should the light in a newly wired house be off when both 3-way switches are in the down position?
When you have two switches that control the same light(s) there are only 4 possible states. Up Up Up Down Down Up Down Down If the starting position is Down/Down and th light if OFF then Up/Down or Down/Up states will turn ON the light. If the starting position is Up/Down or Down/Up and the light is ON then Up/Up or Down/Down will turn lights OFF.
Which command output would you most likely see if you had a problem at the physical layer?
Ethernet 0/0 is down, line protocol is down
