Learning by Doing: CISCO Certified Network ... - SCN Research

Step-by-Step Instructions:
1. Hook up a router to a workstation and watch the steps as the router boots.
2. Try the show commands and fill in the description of what each does. Which type
of processor (CPU, NVRAM, FLASH, RAM/DRAM, ROM) does each command
reside within? Which one (s) do you think you will be using the most, least, and
why? How do you find out what is in ROM?
Command description processor
sh buf (show buffers)
sh fla (show flash)
sh int (show interface)
sh mem (show memory)
sh pro (show processes)
sh prot (show protocols)
sh ru (show run)
sh start (show start)
sh stacks (show stacks)
sh tech (show tech)
sh ver (show version)
3. Let’s look at a basic router script (use show run). My comments are in
handwriting:
Router#sh ru
Building configuration...
Current configuration:
!
version 12.0
Our IOS version
service timestamps debug uptime enables time stamping 1
service timestamps log uptime enables time stamping 1
no service password-encryption disables service passencryption 2
!
hostname Router
Our router name
!
memory-size iomem 15 sets memory i/o to 15 2
ip subnet-zero
Let’s us use subnet zero!
interface Ethernet0/0
interface
no ip address
ip address for this interface
no ip directed-broadcast drops ip directed broadcasts 3
(good…prevents Denial of
Service attacks)
shutdown
Note: shut down by default
!
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