What Is Hub And Switch In Networking Pdf

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what is hub and switch in networking pdf

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A Hub is a networking device that allows you to connect multiple PCs to a single network.

Networks today are essential for supporting businesses, providing communication, delivering entertainment—the list goes on and on. A fundamental element networks have in common is the network switch, which helps connect devices for the purpose of sharing resources.

Network Devices Explained

Network devices, or networking hardware, are physical devices that are required for communication and interaction between hardware on a computer network. Hubs connect multiple computer networking devices together. A hub also acts as a repeater in that it amplifies signals that deteriorate after traveling long distances over connecting cables. A hub is the simplest in the family of network connecting devices because it connects LAN components with identical protocols. A hub can be used with both digital and analog data, provided its settings have been configured to prepare for the formatting of the incoming data.

For example, if the incoming data is in digital format, the hub must pass it on as packets; however, if the incoming data is analog, then the hub passes it on in signal form. Hubs do not perform packet filtering or addressing functions; they just send data packets to all connected devices. There are two types of hubs: simple and multiple port. Switches generally have a more intelligent role than hubs.

A switch is a multiport device that improves network efficiency. The switch maintains limited routing information about nodes in the internal network, and it allows connections to systems like hubs or routers. Strands of LANs are usually connected using switches. Generally, switches can read the hardware addresses of incoming packets to transmit them to the appropriate destination.

Using switches improves network efficiency over hubs or routers because of the virtual circuit capability. Switches also improve network security because the virtual circuits are more difficult to examine with network monitors.

You can think of a switch as a device that has some of the best capabilities of routers and hubs combined. A multilayer switch is one that can operate at both layers, which means that it can operate as both a switch and a router. A multilayer switch is a high-performance device that supports the same routing protocols as routers.

Switches can be subject to distributed denial of service DDoS attacks; flood guards are used to prevent malicious traffic from bringing the switch to a halt. Routers help transmit packets to their destinations by charting a path through the sea of interconnected networking devices using different network topologies.

Most routers can be configured to operate as packet-filtering firewalls and use access control lists ACLs. Such routers are known as border routers. Router are also used to divide internal networks into two or more subnetworks. Routers can also be connected internally to other routers, creating zones that operate independently.

Routers establish communication by maintaining tables about destinations and local connections. Routers are your first line of defense, and they must be configured to pass only traffic that is authorized by network administrators. The routes themselves can be configured as static or dynamic. If they are static, they can only be configured manually and stay that way until changed.

If they are dynamic, they learn of other routers around them and use information about those routers to build their routing tables.

Routers are general-purpose devices that interconnect two or more heterogeneous networks. They are usually dedicated to special-purpose computers, with separate input and output network interfaces for each connected network. Because routers and gateways are the backbone of large computer networks like the internet, they have special features that give them the flexibility and the ability to cope with varying network addressing schemes and frame sizes through segmentation of big packets into smaller sizes that fit the new network components.

The router, with the help of a routing table, has knowledge of routes a packet could take from its source to its destination.

The routing table, like in the bridge and switch, grows dynamically. Upon receipt of a packet, the router removes the packet headers and trailers and analyzes the IP header by determining the source and destination addresses and data type, and noting the arrival time. It also updates the router table with new addresses not already in the table. The IP header and arrival time information is entered in the routing table. Routers normally work at the Network layer of the OSI model.

Bridges are used to connect two or more hosts or network segments together. The basic role of bridges in network architecture is storing and forwarding frames between the different segments that the bridge connects. By looking at the MAC address of the devices connected to each segment, bridges can forward the data or block it from crossing. Bridges are used to divide larger networks into smaller sections by sitting between two physical network segments and managing the flow of data between the two.

Bridges are like hubs in many respects, including the fact that they connect LAN components with identical protocols. However, bridges filter incoming data packets, known as frames, for addresses before they are forwarded. As it filters the data packets, the bridge makes no modifications to the format or content of the incoming data. The bridge filters and forwards frames on the network with the help of a dynamic bridge table.

Bridges, like hubs, can be either simple or multiple port. Bridges have mostly fallen out of favor in recent years and have been replaced by switches, which offer more functionality. At the Transport layer and above, there are numerous protocols and standards from different vendors; gateways are used to deal with them. Because of this, gateways connect two or more autonomous networks, each with its own routing algorithms, protocols, topology, domain name service, and network administration procedures and policies.

Gateways perform all of the functions of routers and more. In fact, a router with added translation functionality is a gateway. The function that does the translation between different network technologies is called a protocol converter. Modems modulators-demodulators are used to transmit digital signals over analog telephone lines. Thus, digital signals are converted by the modem into analog signals of different frequencies and transmitted to a modem at the receiving location.

The receiving modem performs the reverse transformation and provides a digital output to a device connected to a modem, usually a computer. The digital data is usually transferred to or from the modem over a serial line through an industry standard interface, RS Modems work on both the Physical and Data Link layers.

A repeater is an electronic device that amplifies the signal it receives. You can think of repeater as a device which receives a signal and retransmits it at a higher level or higher power so that the signal can cover longer distances, more than meters for standard LAN cables.

Repeaters work on the Physical layer. While an access point AP can technically involve either a wired or wireless connection, it commonly means a wireless device. An AP works at the second OSI layer, the Data Link layer, and it can operate either as a bridge connecting a standard wired network to wireless devices or as a router passing data transmissions from one access point to another. Access points typically are separate network devices with a built-in antenna, transmitter and adapter.

They also have several ports, giving you a way to expand the network to support additional clients. Depending on the size of the network, one or more APs might be required to provide full coverage. Additional APs are used to allow access to more wireless clients and to expand the range of the wireless network. Each AP is limited by its transmission range — the distance a client can be from an AP and still obtain a usable signal and data process speed. The actual distance depends on the wireless standard, the obstructions and environmental conditions between the client and the AP.

Higher end APs have high-powered antennas, enabling them to extend how far the wireless signal can travel. However, for security reasons, APs can be configured not to broadcast the SSID, which means that an administrator needs to give client systems the SSID instead of allowing it to be discovered automatically. Wireless devices ship with default SSIDs, security settings, channels, passwords and usernames.

For security reasons, it is strongly recommended that you change these default settings as soon as possible because many internet sites list the default settings used by manufacturers. Access points can be fat or thin. Fat APs, sometimes still referred to as autonomous APs, need to be manually configured with network and security settings; then they are essentially left alone to serve clients until they can no longer function.

Thin APs allow remote configuration using a controller. Since thin clients do not need to be manually configured, they can be easily reconfigured and monitored. Access points can also be controller-based or stand-alone. Having a solid understanding of the types of network devices available can help you design and built a network that is secure and serves your organization well.

However, to ensure the ongoing security and availability of your network, you should carefully monitor your network devices and activity around them, so you can quickly spot hardware issues, configuration issues and attacks.

Get expert advice on enhancing security, data management and IT operations, right in your inbox. We care about security of your data. Privacy Policy. Thank you for subscription. Go Up. Netwrix Blog. To build a strong network and defend it, you need to understand the devices that comprise it.

What are network devices? Jeff Melnick. He is a long-time Netwrix blogger, speaker, and presenter. In the Netwrix blog, Jeff shares lifehacks, tips and tricks that can dramatically improve your system administration experience.

Network devices Network security. Jeff Melnick May 20, Jeff Melnick October 3, Top 10 Best Network Monitoring Tools. Jeff Melnick October 29, Featured tags.

Network switch

A hub is a physical layer networking device which is used to connect multiple devices in a network. They are generally used to connect computers in a LAN. A hub has many ports in it. A computer which intends to be connected to the network is plugged in to one of these ports. When a data frame arrives at a port, it is broadcast to every other port, without considering whether it is destined for a particular destination or not.

Ethernet Switches by Joann Zimmerman, Charles E. Spurgeon

Network devices, or networking hardware, are physical devices that are required for communication and interaction between hardware on a computer network. Hubs connect multiple computer networking devices together. A hub also acts as a repeater in that it amplifies signals that deteriorate after traveling long distances over connecting cables. A hub is the simplest in the family of network connecting devices because it connects LAN components with identical protocols. A hub can be used with both digital and analog data, provided its settings have been configured to prepare for the formatting of the incoming data.

The key difference between hubs, switches and bridges is that hubs operate at Layer 1 of the OSI model, while bridges and switches work with MAC addresses at Layer 2. Hubs broadcast incoming traffic on all ports, whereas bridges and switches only route traffic towards their addressed destinations. Hubs provide a dedicated physical connection for every device, which helps reduce the possibility that a failure of one computer will cause all computers to lose connectivity.

What is a network switch, and how does it work?

What is a network switch?

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3 Comments

  1. Jaime J. 04.04.2021 at 07:23

    Ethernet switches link Ethernet devices together by relaying Ethernet frames between the devices connected to the switches.

  2. Cindy P. 06.04.2021 at 22:38

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  3. Ifigenia R. 12.04.2021 at 21:04

    A network switch also called switching hub , bridging hub , and, by the IEEE , MAC bridge [1] is networking hardware that connects devices on a computer network by using packet switching to receive and forward data to the destination device.