Network switch introduction

This is layer 2 device (data link layer devices) mostly. It is use for star topology; it is used to extend the network connectivity.

A network switch is used in a wired network ot connect to other device using ethernet cables. The switch allows each connected device to talk to the others. Wireless only networks do not use switch because devices such as wireless routers and adapters communicate directly with one another.

Although you can use the ports on the back of a router or modem to connect a few ethernet devices together, switch offer a number of advantages:

Switches allow you to connect dozens of devices.

Switches keep traffic between two devices from getting in the way of your other device on the same network.

Switches allow you to control who has access to various parts of the network.

Switches allow you to monitor usage.

Switches allow communication (withing your network) that's even faster than the internet.

High end switches can be tailored to your network needs with pluggable modules.

Types of switches in networking

1. Manageable switch

2. Non-manageable switch

Manageable switch:-

It is consisting system (ios) and it is useful for manage division of LAN.

Non-manageable switch:-

This switch is simple switch only use for to transfer packet from source to destination.

Manageable switch and non-manageable switch when start at 1st time they collect mac-address table of the all resources in the network and after that directly transfer data in the network and after that directly transfer data between source to destination.

Technology used in network switch

1. Cut through switch.

2. Modified cut through switch

3. Store and forward.

Cut through switch:-

In this technology only mac-address read and transfer to destination.

Modified cut through:-

In this technology all packetsare received, modified it 64-bit and transfer to the destination.

Store and forward:-

In the technology all the package are store in the switch then remove error of the frame, regenerate, packers transfer to the destination.

Manufacture of network switch

Cisco
Juniper
3com
Hp
D-link....etc.

Layer of network switches

1. Access layer:-

It is consist 2900, 2950, 2960 series of switch mostly use in small offices and small network.

2. Distribution layer:-

This is called multilayer switch in this type there are 3500, 3700, 3800, 3900, 4600 switches are included.

3. Core layer:-

This is the backbone of any ISP. This switch is generally use in data center. This switch consist 10000, 12000, 2000, 1000, 5000, 7000, 9000 switches.

Network switch LED indicator

1. System LED:-

It is show whether the system is receiving power and properly work, if it is off there is no power functionality. If it is Amber then it is not receive proper power supply.

2. Rsp LED (redundancy power supply):-

Provide the backup power supply indicator.

3. Port status LED:-

It is used to view the status of the led, if the led is off there is no link or it is shutdown, if the led is green link is present, if the the led is alternating green amber indicating link fault, if the led is Amber the port is black.

4. Duplex mode led:-

If the port is green them it work on full duplex and if it is amber then it is half duplex.

5.port speed led:-

If the compatible speed is work then it is green and the speed is lowest then it indicate amber.

6. Poe (port on ethernet):-

Poe indicator mode.

Switch configuration with password

How to access switch:-

Start---accessories---communication---hyperterminal---comi---ok---restore default---ok---ok then you will get.

Switch>en

Switch#config t

Switch(config)#

How to break password of switch:-

When we fill up the password in the switch it is save in the text file. When we want to break the password we need to rename this text file

Step 1: on/off the switch

Step 2: press the mode button in front of switch

Step 3: release mode button when system led blink umber and then turn solia green.

Switch: flash_init

Switch: load_helper

Switch: dir flash:

Switch: rename flash:config textflash:config.old

Switch: boot

After that you have massage appear would you like toenter basic management setup-----enter "no"

Switch>en

Switch#rename flash: config.old flash:config.text

Switch#copy flash: config.txt system: running-config

Switch#config t

Switch (config)#line console 0

Switch (config-line)#pass ccna

Switch (config-line)#line vty 0.4

Switch (config-line)#pass ccna

Switch (config-line)#login

Switch (config)#enable secret ccna

Switch (config)#ctrl+z

Switch#wr

Network Switch VS Router

When building a small office network, the two most essential pieces of equipment you will need are switches and routers. Though they look similar, the two devices perform different functions within a network.

What is a switch?

Switches facilitate the sharing of resources by connecting together all the devices, including computers, printers, and servers, in a small business network. Thank to the switch, these connected devices can share information and talk to each other, regardless of where they are in a building or on a campus. Building a small business network is not possible without switches to tie device together.

What is a router?

Just as a switch connects multiple devices to create a network, a router connects multiple switches, and their respective network, to form an even larger network. These network may be in a single location or across multiple locations. When building a small business network, you will need one or more routers. In addition to connecting multiple network together, the router also allows network device and multiple users to access the internet.

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