cisco Networking

Cisco Networking

Switches:                                                                              

1.      Layer two

a.      LAN port

b.      Management  Port
c.   Console
d. Interface Port

2.      Layer three

a.      LAN Port

b.      WAN Port

c.       Management Port

d.      Interface Port

Initial Configuration of Switch:

1.      Login through Console port

2.      Hostname

3.      Negating Commands

4.      Console Password

5.      Telnet Password

6.      Enable Password

7.      Enable Secret

8.      Management VLAN

9.      Default Gateway

10.  Shutdown

11.  Login Banner

12.  Saving Configuration

Configure SSH on a Cisco Device

·         Configure Hostname

·         Configure a domain-name

·         Generate encryption key

·         Enable SSH version 2

·         Create local username

·         Choose to allow telnet and ssh

·         Enable login local on vty

Switch(config)# Hostname HRT-S1

HRT-S1(config)# ip domain-name cisco.com

HRT-S1(config)#crypto key generate  rsa

HRT-S1(config)#ip ssh version 2

HRT-S1(config)#username  admin secret admin

HRT-S1(config)#line vty 0 15

HRT-S1(config-line)#transport input (all, none, ssh, telnet)

Port Security

·         Port security – what is it?

·         Limiting the number of devices on a port

·         Limiting ports to a specific AND “Sticky” MAC ADDRESS

HRT-S1(config)#interface fastethernet 0/12

HRT-S1(config-if)#switchport mode access

HRT-S1(config-if)#switchport port-security (aging, Mac-address, Maximum, Violation)

HRT-S1(config-if)#switchport port-security mac-address sticky

HRT-S1(config-if)#do show run interface fa0/12

HRT-S1# show port-security

HRT-S1#show port-security address

HRT-S1#show port-security interface fa0/1

Half and Full Duplex

Speed and Duplex

HRT-S1 (config-if)#duplex (auto, half, full)

Auto is used when the speed is Gigabit

HRT-S1 (config-if)#speed (10,100,1000)