OSI Model the easy way

7. Application – Browser, FTP client, Telnet client
6. Presentation – encryption, compression, SSL
5. Session – authentication, permissions, sockets,
4. Transport – Protocol (TCP/UDP), ports
3. Network – IP Address, Routing
2. Data Link – MAC Address
1. Physical – Cable, Ethernet Card

Cisco router on a stick


* packet tracer is used in this setup

ROUTER CONFIGURATION

A. Create sub-interfaces

# configure terminal

# interface FastEthernet 0/0.10

# encapsulation dot1q  10

# ip address 192.168.10.1 255.255.255.0

# interface FastEthernet 0/0.20

# encapsulation dot1q  20

# ip address 192.168.20.1 255.255.255.0

# interface FastEthernet 0/0.30

# encapsulation dot1q  30

# ip address 192.168.30.1 255.255.255.0

! Check time

CREATE DHCP SERVER FOR THE SUBNETS

# configure terminal

# ip dhcp excluded-address 192.168.10.1 192.168.10.5

# ip dhcp excluded-address 192.168.20.1 192.168.20.5

# ip dhcp excluded-address 192.168.30.1 192.168.30.5

# ip dhcp pool accounting

# network 192.168.10.0 255.255.255.0

# default-router 192.168.10.1

# ip dhcp pool procurement

# network 192.168.20.0 255.255.255.0

# default-router 192.168.20.1

# ip dhcp pool services

# network 192.168.30.0 255.255.255.0

# default-router 192.168.30.1

! Check time

SWITCH CONFIGURATION

A. Create VLANs

# configure terminal

# vlan 10

# name ACCOUNTING_DEPT

# vlan 20

# name PROCUREMENT_DEPT

# vlan 30

# name SERVICES_DEPT

B. Configure Interfaces

# configure terminal

# interface fastEthernet 0/1

# switchport mode access

# switchport access vlan 10

# interface  fastEthernet 0/2

# switchport mode access

# switchport access vlan 20

# interface  fastEthernet 0/3

# switchport mode access

# switchport access vlan 30

! Check time

Set PC configuration to DHCP (obtain IP address from DHCP server)

Some issues about Cisco Linksys Routers

According to Jason Perlow, some routers of Cisco have certain issues. The models mentioned were WRT-610N, E3000, E2000, and E1000. According to the article, those models were experiencing reliability issues and sometimes knocks out your Internet access. The devices get so hot to a point were you would think it’s overheating.

Good news is that Cisco Engineers are actively looking to fix the issues and make the users “happy” and  “confident” about Cisco Linksys producs. You can read his entire article at http://www.zdnet.com/blog/perlow/cisco-linksys-the-makeover/16665