What Is Network Hub?
Network Hub is one of the most basic computer network devices. Network hub created a lot of time ago fr basic local network connectivity which. Today’s network hub is rarely used for computer networks because of its disadvantages against the
What Is Network Hub?
As its name suggests
Network Hub provides a central point to connect the computer network traffic. A network hub has RJ-45 ports where computers are connected to a network bus inside the hub. Every network traffic and signal are transmitted to all connected ports and computers via this bus. This mechanism is called broadcasting where all computers get network packages regardless of related to them.
In some cases, modern network switches can be called a network hub because of the same functionality. This especially occurs if the given network switch has very few port numbers like 4 or 6 because of the physical similarity to the network hub.
How Network Hub Works?
As a cheap network connectivity solution network hubs do not provide intelligent network traffic management. Network hubs only transmit network packet’s electrical signals to all connected devices. According to OSI reference model network hubs work at Layer 1 where only electrical signals work. Network hubs can not destinate the network packets because they do not understand higher network layers like OSI Layer 2 like ethernet protocol. Network hubs also cannot detect a collision when two different computers or hosts send packets at the same time which will interfere with each other. Also, network hubs do not understand higher-level network protocols like IP, HTTP, etc. because they work in the OSI layer 3 and higher.
Network Hub Advantages
Even the network hub is an old and low-level technology it may have some advantages for use.
- Network hubs are very low in cost because of restricted features.
- Network hubs can work in very harsh environments without a problem.
Network Hubs Disadvantages
In general with the advancement of the technology network switches emerged which put the network hubs into a disadvantaged position.
Network Hubsprovides very little technology and features.
Network Hubscan not prevent network collusions.
Network Hubsdo not switch packets to the recipient directly.
Network Hubsare slower than network switches.
Network Hubsoperates as half-duplex where only a single host or computer can send signal others must listen.
Network Hubscan listen with network sniffers easily which creates a network security problem.
Network Hub vs Network Switch
Network hubs and network switches provide similar functionalities with different technologies and features. Let’s compare network hubs with network switches.
Network Hubsoperate in the Physical layer (Layer 1) of the OSI model where
Network Switchesoperates in the Data Link layer (Layer 2) of the OSI model.
Network Hubsare non-intelligent network devices that simply send messages to all ports where
Network Switchesare intelligent network devices they send messages to the selected recipients.
Network Hubsbroadcasts messages where
Network Switchesswitch or unicast, multicast and broadcast messages according to the situation.
Network Hubswork as half-duplex where
Network Switcheswork as full-duplex.
Network Hubsgenerally creates network or packet collision where
Network Switchesdo not create a network or packet collision.
Network Hubsare passive devices where they do not have any software or firmware where
Network Switchesare active devices they equipped with some software of firmware to act intelligently.
Network Hubsgenerally has less port count like 4/12 where
Network Switcheshas more port count like 24/48.