Posted filed under CompTIA Network+.

 

When you buy brand new switches all we need connect the PC to switch port and then PC can talk to each other ; but I can take a Switch like Cisco Switch and create a few VLAN ; such as

(Here is general Idea of VLAN)

VLAN 10 = Publishing
VLAN 20= Accounting
VLAN 30= security

 

Vlan Name Status Ports
1 Default Active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/7, Fa0/8Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

Gig0/1, Gig0/2

as we see all the ports are located in default VLAN one ; now   I will create

two VLAN and assigned the port as follow

VLAN 2 EGR    f0/1,f0/2

VLAN 3 Sales   f0/4,F0/5

Here is the result after I have done above

Switch#show vlan brief

Vlan Name Status Ports
1 Default Active Fa0/3, Fa0/6, Fa0/7, Fa0/8Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

2 EGR Active Fa0/1, Fa0/2
3 sales Active Fa0/4 Fa0/5,

As we see now PC1 can talk to PC2 , and PC4 can talk to PC5 , but PC1 can not ping PC4 or PC5 since I need to have a router between them.

Here is the diagram after I put the router between them. Make sure give ip address of

10.10.10.100 to f0/0

20.20.20.100 to f0/1 and make sure turn on the port ; since by default all the ports are in shut down mode

Now lets look see if from PC1 can ping PC4.

As we see PC1 can not ping PC4 , so lets try to troubleshoot , go to PC1 and see if you can ping the

DG=10.10.10.100

 

PC>ipconfig

FastEthernet0 Connection:(default port)

 

Link-local IPv6 Address………: FE80::230:F2FF:FEA7:AB9D

IP Address………………….: 10.10.10.1

Subnet Mask…………………: 255.255.255.0

Default Gateway……………..: 10.10.10.100

 

PC>ping 10.10.10.100

Pinging 10.10.10.100 with 32 bytes of data:

 

Request timed out.

Request timed out.

Request timed out.

Request timed out.

 

Ping statistics for 10.10.10.100:

Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

 

As we see we cannot ping the DG

 

Why ?

 

Think of OSI Layer model .

 

Remember IP address is located on layer 3

  1. Physical Layer
  2. Data Link Layer ( look at your Switch)
  3. Network Layer

Now when I look at Switch and I type

Switch#show vlan brief

 

Vlan Name Status Ports
1 Default Active   Fa0/7, Fa0/8Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

2 EGR Active Fa0/1, Fa0/2, Fa0/3,
3 sales Active Fa0/4, Fa0/5,Fa0/6,

 

Now I should be able to ping from PC1 =10.10.10.1 to Pc4=20.20.20.4

 

PC>ping 20.20.20.4

Pinging 20.20.20.4 with 32 bytes of data:

 

Reply from 20.20.20.4: bytes=32 time=1ms TTL=127

Reply from 20.20.20.4: bytes=32 time=1ms TTL=127

Reply from 20.20.20.4: bytes=32 time=1ms TTL=127

Reply from 20.20.20.4: bytes=32 time=0ms TTL=127

 

Ping statistics for 20.20.20.4:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

 

Now lets say instead of two VLAN , we have three or four VLAN ; in that case I can not out so many router between each VLAN , so cisco came with idea of Multi layer switch ( Cisco 3550, 3560 ,3575 and above) that allows you to be a layer 2 (switch) and layer 3 device (act as router) in that case we do not need a router ; which is but a Cisco 3550 and above then I can route packet from one vlan to another vlan. ( CCNA/CCNP concept)

 

 

Here how it looks like at Cisco Switch; when you buy brand new Switch (without configuration)

Want more information on how to become CompTIA Network+ Certified? Learn more!

 

 

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