Network Devices Behavior - Tutorial 4
Not only a network issue, but you can feel good and you have the determination about what has to do with a clear image of the process or the methods you have to take, you can jump into the work without breaking your hands. In this lesson, we will look at some of the characteristics of network devices. Let's consider common network devices and find what are the characteristics of them.
Hub
- There isn't any security mechanism when data is communicating through a hub.
- Half-duplex device
- If you can send and receive data at the same time, it is called Duplex Communication. Full-duplex is the same thing.
- Half-duplex: Half-duplex is said to transmit data to one side at a time. (Walkie talkie is a good example)
- Simplex communication: If you are always transmitting data to one side it is called Simplex communication.
- Work in the physical layer and the device is unmanageable. Therefore we cannot change the setting or configure the device.
- All devices connected to the hub belong to the same collision domain and the hub has only one broadcast domain. Collision domain (When a data packet is received to the hub, then the hub will send the data packet to all devices at once which connected to the hub ports). That means the hub is broadcasting the data packet to others. Hense hub has a one broadcast domain. When transmitting data like that, the bandwidth of the network is going to fully utilize. Thus the network performance reduces and speed gets slow.
- A collision domain is smaller than the broadcast domain and collision domain situated at a broadcast domain. When data is transmitting through a hub, so many collisions can happen due to the hub sends the data packet for everyone who connected to the hub's ports.
- Hub can identify the collisions but cannot mitigate because the hub doesn't have manageability.
- Hub is a multi-port device in a repeater.
Switch
- Higher security than a hub. We can transmit data across a switch with more securely.
- The switch is a full-duplex device and no collision occurred.
- Speed data transmission due to every switch port has dedicated bandwidth. The transmitting data can be view only by source and destination computers.
- The switch can do unicast, multicast and also the broadcast if the destination MAC address doesn't place in the MAC address table.
- Manageable device and can configure it.
- Layer 2. Switch takes decisions by looking at the destination MAC address. The switch creates a MAC address table by looking at source MAC addresses. Let's say PC-A wants to send a frame to PC-C.
- First, the frame is entered into the switch port. Then switch keeps it in its buffer temporarily. The source PC MAC address and switch port details send to the MAC address table. The switch checks, the destination MAC address is available by sending the frame via other all other remaining ports except which frame entered (broadcasting).
- Example: Let's day C wants to send a frame to D. Switch keeps the frame in switch's buffer and store source MAC address and switch port into the MAC address table. Then check the MAC address of the destination in the MAC address table, if it is not in the table, the switch will send the frame through all port expect the initial frame entered. Thus the MAC address table is created. After creating the table, data transmission is going to happen as a unicast transmission. The bridge has the same characteristics as a switch.
Router
- Routers never do broadcasting in the network. A router creates a routing table by using network addresses and interfaces.
- Router increases the broadcast domain in the network. A router can send data from one broadcast domain to another broadcast domain.
- Layer 3 device.
If you have any doubts, please don't hesitate to let us know. The comment section is open for everyone. Let's
see you in the next lesson
>> Internetwork Operating System (IOS).
Cheers!
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