Computer Network Routers, Hubs, and Switches

When computer networks are working well, which we hope is most of the time, the inner workings of the system modules are transparent to the average user. The most common components on a computer network, not counting cables, are "routers", "hubs", and "switches". Many of these modules can be similar cosmetically. Each assembly typically has Ethernet connectors (RJ45, which looks like an oversized telephone plug) and LED indicators. However, these modules function differently, and it is important to understand the differences.

Modern network hardware operates on the "Open System Interconnection" (OSI) standard. This standard defines how communications on a network should be implemented. By conforming to this standard, modules from different manufacturers can coexist on the same network. Wireless networks (WiFi) and the 802.11X standard are an additional subset of network systems.

When a message is sent between computers, it is broken into parts. At the base level, the message is reduced to "1" and "0" bits. The next level is a group of bits called a "frame". A frame contains its control information, including target address and error detection. The next level is a group of frames called a "packet". The terms frame and packet are sometimes used interchangeably. If a message is sent on a complex network like the Internet, some of the packets may take a otherwise, and met at the destination.

Tracking error with two frames and packages used. The most common procedure is called "cyclic redundancy check (CRC). Sums CRC of all" 1 "in the frame or packet. This number in hex at the end of frame / packet is stored. On the receiving side, the process is repeated . If I have the two hexadecimal values, is the proof. Otherwise, the receiver requests that the sending deviceresend. Most of this functionality is performed by integrated circuits (chips) inside the network modules.

The Hub

The network hub operates on the first layer of the OSI standard, called the "physical layer". The hub is the most simple of the three modules. A hub is not aware of the contents of the message that is processed; it handles the message as bits. It simply records the signal, and rebroadcast it to all, including back to the port that sent the message. An "active" hub will clean the electrical signal of noise and amplify the signal before rebroadcast. A "passive" hub does not amplify the received signal; it merely receives a signal, and rebroadcast the signal as received to each port. Hubs are sometimes used to link multiple computers with a printer.

The Network Switch

The network switch operates on the second layer of the OSI standard, called the "data link layer". The network switch, as indicated by its name, switches signal paths, so that a message frame goes to a specific destination. A switch will improve a networks performance, especially on networks with many computers. A switch has enough on-board intelligence to remember the path to each destination. The network switch handles a message in frames. 

When you connect a computer to a network switch, the switch will record the Media Access Control or "MAC" address of the computer's network interface card (NIC). This is called address protocol, or "ARP". When a frame is received intended for a specific computer, the switch sends the frame only to that computer. By preventing paths of the network from being utilized by every frame, network resources are conserved. Computer A can send a frame to computer B, while simultaneously, computer C is sending a frame to computer D.

The Network Router

The network router operates on the third layer of the OSI standard, called the "network layer". A router's name is also indicative of its role. Routers have some of the same capabilities as switches, but routers are most often used to connect two or more networks. For example, a router could be used to connect a wireless network with a conventional local area network (LAN). Another common use is to connect a LAN with the Internet (a "wide-area network", or "WAN"). In this role, the router uses "Network Address Translation" (NAT) so that all of the computers attached to the LAN can share a single IP address. A network router handles the message in packets. A router uses the IP addresses in the packets to route them between multiple networks.

A personal computer can be configured to handle the function of a router if it is equipped with router software and two or more network interface cards (NIC). A separate NIC is needed for each network.

A router is capable of advanced functions, including serving as DHCP (domain host control protocol) server and Firewall. A Firewall protects computers from potential hazards from the other computers outside the network. Linking multiple networks often requires the conversion of protocols. 

A router is an extremely diverse classification. Routers may provide connectivity inside offices, between different locations, and between businesses and the Internet. The largest routers connect Internet service providers, are used in very large business networks, or connect a business with a satellite link to a distant corporate locale. Advanced routers are powerful computers, complete with microprocessors. Very sophisticated routers are used by the Internet to manage the network traffic most efficiently. 

A router maintains a table called "routing information base" (RIB) that tracks information about the available routes. The RIB can be static (manually determined by a network administrator) or dynamic (continually updated based on changing conditions). A RIB is simple on a small LAN, but can be extremely complex in the very large routers used on the Internet.

Summary

There are more types of network modules than the three discussed here, and there can be significant overlap in roles. For example, an "intelligent hub" can have many of the characteristics of a network switch. Wireless networks (WAN) have much in common with their conventional LAN cousins, but additional protocol is added for the special security and interference concerns specific to wireless networks. Multiple roles may be combined into a single assembly. Network routers sometimes have subassemblies that function as network switches.  

Computer network routers, hubs and switches

If computer networks are working well and we can only hope that most of the time, the inner workings of the system modules are transparent to the average user. The most common components in a computer network, not including the cable, "are" router "hub" and "switch". Many of these modules can be aesthetically similar. Each module is typically Ethernet ports (RJ45, which seems to connect a phone large) and LED display. However, theseForms> work differently, and it is important to understand the differences.

modern network hardware work on the "Open System Interconnection (OSI) standard. This standard defines how communication should be implemented in a network. By this standard, the modules from different vendors can coexist on the same network. Wireless Networks (WLAN) and 802.11x standard is an additional element of network systems.

If aMessage is sent from one computer to another, will be subdivided into parts. A basic level, the message of "1" and "0" bit is reduced. The next step is a group of bits as a "framework". A frame contains control information including the destination address, and error detection. The next step is a set of frames as a "package". The terms frame and packet are sometimes used interchangeably. If a message is sent through a complex network like the Internet, some packetsotherwise, and met at the destination.

Tracking error with two frames and packages used. The most common procedure is called "cyclic redundancy check (CRC). Sums CRC of all" 1 "in the frame or packet. This number in hex at the end of frame / packet is stored. On the receiving side, the process is repeated . If I have the two hexadecimal values, is the proof. Otherwise, the receiver requests that the sending device. Send Most of these functions are performed by modules integrated circuits (chips) on the network.

The Hub

The hub network is working on the first layer of the OSI, the process known as "physically." The hub is the simplest of the three;. Module A hub is not aware of the contents of the message that it processes the message as a bit '. It 'simply records the message and distribute it to everyone, even back in portthat your message hub "active", the electrical signal from the noise and amplify the clean signal before repeating hub "person" does not amplify the signals received, .. it only receives a signal and get the signal as a repeat for each port. The hubs are sometimes used to connect multiple computers to a printer.

The network switch

The power switch works on the second layer of the OSI standard, the so-called "Data Link Layer." The network ofSwitch, as the name suggests on, signaling pathways, so that a wire leading to a particular destination. A switch is to improve network performance, especially in networks with large numbers of computers. A switch has enough intelligence on board to mark the path to each destination. The switch operates a network of message frames.

When you connect a computer to a network switch, the switch records or Media Access Control address "MAC" ComputerNetwork Interface Card (NIC). This is called "ARP", such as address or protocol. If a frame is received for a specific computer, the switch sends the frame on this machine only. Preventing the streets of the network used by all frameworks, network resources are conserved. A computer can have a frame to send computer B, while at the same time, computer C computer sends a frame to D.

The network router

The network router is working on the thirdLayer of the OSI standard, called "Network Layer". A router is the name of a reference to his role. Routers are some of the same functions as switches, routers, but most often used two or more networks. For example, a router could) be used to connect a network with a conventional wireless LAN (Local Area Network. Another common use ") is a LAN connection to the Internet (a" Wide Area Network "or" WAN. In this role, theRouter uses Network Address Translation (NAT) so that all computers connected to LAN address can be a shared IP. A network router message packets. A router uses IP addresses to route packets between multiple networks.

A PC can be configured to handle the function of a router when you use the router software and two or more network interface cards (NIC) is. A separate network card for every needNetwork

A router is capable of advanced features, including a (Domain Host Control Protocol), DHCP server and firewall. A firewall protects your computer from potential threats from other computers on the network. The connection of multiple networks often requires the conversion of protocols.

A router is a versatile classification. Router can provide connectivity within agencies, between different locations, including businesses and the Internet.The largest routers combine Internet Service Providers are used in corporate networks of large size, or close a deal with satellite remote to a local company. Advanced routers are powerful computer, complete with microprocessors. Very sophisticated routers are used by the Internet to manage network traffic more efficiently.

A router maintains a table called "Routing Information Base (RIB), which tracks information on courses available. May be at the RIB (To be updated continually as conditions change) dynamic static (manually determined by a network administrator) o. A RIB is easily on a small LAN, but can be very complex and very large routers used on the Internet.

Summary

There are different types of network modules compared to the three discussed here, and may be significant overlap of roles. For example, an "intelligent hub" change many of the characteristics of a network.> Wireless Networks (WAN) have much in common with their cousins traditional LAN, but new security protocol networks and concerns specifically related to wireless interference. A single meeting roles may be combined in many network routers sometimes have components as the function of network switches.

Network Switches - Basics

The network switch plays a key role in society and people home networks, but too many confuse what is the purpose of the system and how it differs from a router. I decided to write this blog post to explain the basics of passage - from different species, suppliers to buy from them.

A brief overview of network switches

A network switch is a type of computer network products, network bridge segments. Change sometimes referred to as a packageor simply a switch. The switch is an important component in the most networks (LANs), including medium and large corporate networks that use managed switches connected to each other more.

A switch is much less demanding than a router. While routers and switches are very similar in appearance, they differ significantly in their router internal components.

Types of network switches

Unmanaged Switch: This is usually the least expensive type ofSwitch, most commonly in homes or small offices. They are very easy, takes the plug and play, no specific configuration options

Managed Switches: Managed Switches offer optional configuration options, enabling a wide variety of features. There are several ways to make these options, the use of an instrument at a distance, such as Simple Network Management Protocol (SNMP) access to the switch to a command line interface such as telnet.


IntelligentSwitch: Smart Switches are different from fully managed switches, because they allow only a certain number of changes and functionality. Because users can configure the basic settings, they are often cheaper than the fully-managed breeding. Some basic functions often turn to a switch port Smart are some details on or off, connection speed and duplex settings and the settings for port priority

Enterprise Managed Switches: Enterprise Switches are more configurable andexpensive version of managed switches. They are more common in business networks in a number of other switches. They are more efficient for large enterprises, where the module can access a central administration to save time and money. Some advanced features for business settings switches VLAN, link aggregation and port mirroring.

Switches purchases

There are several switches manufacturer brands that offer differentiated and competitive products, including Cisco,3Com, Alcatel e. While switches are purchased out of the box from online retailers, can a way to save money is to use a switch from a retailer online to find. A business buyer can often save thousands of dollars to buy used Cisco or other networking hardware brand.

If you decide to go the way of an online retailer, you must consider several factors to ensure that skills are a good fit. One factor is a good guarantee as it is always a risk to buy usedEquipment. Another reason is significant discounts (50%) the price of retail. The third aspect which I recommend an online manufacturer of network hardware is a good score. The ability to help people is to talk with your purchase undervalued.

I hope this post "support base switch 'helps those who are confused or looking for a way to buy a switch.