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61 Cards in this Set

  • Front
  • Back
ip domain-name [cisco.com]
Appends to each request the domain name cisco.com
ip helper-address
To forward DHCP request to a DHCP Server on a different VLAN
ip subnet-zero
Enable Subnet Zero on the router
show ip arp
Show arp table on router
interface f0/0.1
Change to sub interface 0.1 on interface f0
Change to privileged exec mode
IOS enable command
show history
Show command line history in IOS
show terminal
Show terminal settings in IOS
terminal history size 200
Change the maximum number of stored commands in the command history to 200
show version
Show boot image and hardware information
banner motd x Unauthorized access prohibited x
Display the old and boring "Unauthorized access prohibited" message to all users loging in to a router via Telnet, SSH, Console Port and Modem.

First message to be displayed
banner login
Banner displayed before the login prompt but after the motd banner
enable password
Set the enable password on < 10.3 IOS systems. (Don't uses it if you don't have an old system)
enable secret
Sets the encrypted enable password on newer systems
enable use-tacacs
Set the enable password using a Tacacs server.

Side note: use the command "enable last-resort" if the Tacacs server is down.
line console 0
login
password this_is_a_password
login
Sets a user mode password (user specific unlike the enable password) for the console
line vty
login
password this_is_a_password
login
Sets a user mode password for a telnet session
line vty 0 15
exec-timeout 0 0
Set the timeout of all available vty session so they never time out.
service password-encryption
Encrypt all passwords in the running config.
ip address 172.16.20.30 255.255.0.0
Assign ip 172.16.20.30 and subnet /16 to an interface.
Serial Int. 0 = Router, 1 = Slot, 2 = Port
What does interface S0/1/2 stand for?
"| includ" and "| exclude"
What is the equivalent in IOS of the Unix commands "| grep" and "| grep -v"?
show controllers s0/0/0
Shows if interface is DCE or DTE and the clock rate
int s0/0/0
bandwith 1000 (kilobits)
Configures the bandwith for a serial link. This information is used by routing protocols to calculate cost (Not RIP. RIP uses hop count)
erease startup-config
Deletes the stored configuration in NVRAM
| Preamble | Source MAC | Dest. MAC | Type | Data | FCS |
Ethernet_II Frame Fields
| I/G | G/L | OUI | Vendor Assigned Number |
I/G indicates a Broadcast/Multicast addr.
G/L indicates a locally/globally administered addr.
MAC address Fields
9600 Bits, 8 Data bits, Parity none, Stop bit 1, Flow Control No
Which console connection configuration options have to be entered when connecting from a Linux or Windows Client?
dir all
Show all Memory Areas
show protocols
Shows status of layer 1 and 2 (up or down) and the layer 3 address
show cdp entry * protocol
Dislplays neighbors network (ip) address
show controllers
Displays hardware information about the physical interfaces
1. POST
2. Load IOS from FLASH
3. Load Configuration from NVRAM
Discribes the boot process of a Cisco Router
show version
Dislpalys: Amounts of Flash, RAM, NVRAM, IOS Version, Processor Type and Configuration Register
DNS, TFTP, DHCP, SNMP, RIP
This applicaton layer protocol use UDP
config-register 0x2101
Set the register to default boot
ctrl + break
Enter rom monitor
confreg 0x2141
Set the config register in rom monitor to boot without loading the startup-config
boot system flash c2800nm-.....bin
Select the IOS Image in flash which should be used the next time the router boots
boot system tftp c2800nm-....bin
Select the IOS Image on TFTP Server which should be used the next time the router boots
show flash:
show nvram:
Shows files in Flash and NVRAM
cd nvram:
cd system:
Changes directory to nvram
Changes directory to RAM
delete
Zapping files on Router file system
show flash:
show nvram:
Shows files in Flash and NVRAM
cd nvram:
cd system:
Changes directory to nvram
Changes directory to RAM
delete
Zapping files on Router file system
copy tftp running-config
Restore configuration from TFTP server
sh cdp neighbors
Shows Device ID (hostname), Localinterf. Capability (S, R, I), Platform and Port ID of adjacent devices.
sh cdp neighbors detail
Shows all of "sh cdp neighbor" plus the IP address and IOS version of the neighbor
sh cdp entry * protocol
Lists Device Name of neighbor device plus its IP address
sh cdp interface
Shows the encapsulation of neighboring devices
no cdp run
Disables CDP
terminal monitor
This command turns on console messages if logging in on a IOS device via telnet
sh sessions
Displays the telnet sessions made from a router to a remote device
sh users
Shows a list of active console and VTY ports in use on your router
ip domain-lookup
ip name-server [192.168.10.100]
ip domain-name [cisco.com]
Configure IOS to use DNS resolution
debug ip rip
Debugging the RIP protocol
undebug all
Disables all debugging commands (alternative no debug all)
sh processes
Displays amongst other things, the CPU utilization
ip dhcp pool ADMIN
network 10.1.8.0 255.255.255.0
default-router 10.1.8.1
exit
ip dhcp excluded-address 10.1.8.1
Configure a DHCP pool on IOS