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61 Cards in this Set
- Front
- Back
ip domain-name [cisco.com]
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Appends to each request the domain name cisco.com
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ip helper-address
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To forward DHCP request to a DHCP Server on a different VLAN
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ip subnet-zero
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Enable Subnet Zero on the router
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show ip arp
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Show arp table on router
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interface f0/0.1
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Change to sub interface 0.1 on interface f0
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Change to privileged exec mode
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IOS enable command
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show history
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Show command line history in IOS
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show terminal
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Show terminal settings in IOS
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terminal history size 200
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Change the maximum number of stored commands in the command history to 200
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show version
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Show boot image and hardware information
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banner motd x Unauthorized access prohibited x
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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 |
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banner login
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Banner displayed before the login prompt but after the motd banner
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enable password
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Set the enable password on < 10.3 IOS systems. (Don't uses it if you don't have an old system)
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enable secret
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Sets the encrypted enable password on newer systems
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enable use-tacacs
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Set the enable password using a Tacacs server.
Side note: use the command "enable last-resort" if the Tacacs server is down. |
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line console 0
login password this_is_a_password login |
Sets a user mode password (user specific unlike the enable password) for the console
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line vty
login password this_is_a_password login |
Sets a user mode password for a telnet session
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line vty 0 15
exec-timeout 0 0 |
Set the timeout of all available vty session so they never time out.
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service password-encryption
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Encrypt all passwords in the running config.
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ip address 172.16.20.30 255.255.0.0
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Assign ip 172.16.20.30 and subnet /16 to an interface.
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Serial Int. 0 = Router, 1 = Slot, 2 = Port
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What does interface S0/1/2 stand for?
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"| includ" and "| exclude"
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What is the equivalent in IOS of the Unix commands "| grep" and "| grep -v"?
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show controllers s0/0/0
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Shows if interface is DCE or DTE and the clock rate
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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)
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erease startup-config
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Deletes the stored configuration in NVRAM
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| Preamble | Source MAC | Dest. MAC | Type | Data | FCS |
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Ethernet_II Frame Fields
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| 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
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9600 Bits, 8 Data bits, Parity none, Stop bit 1, Flow Control No
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Which console connection configuration options have to be entered when connecting from a Linux or Windows Client?
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dir all
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Show all Memory Areas
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show protocols
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Shows status of layer 1 and 2 (up or down) and the layer 3 address
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show cdp entry * protocol
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Dislplays neighbors network (ip) address
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show controllers
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Displays hardware information about the physical interfaces
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1. POST
2. Load IOS from FLASH 3. Load Configuration from NVRAM |
Discribes the boot process of a Cisco Router
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show version
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Dislpalys: Amounts of Flash, RAM, NVRAM, IOS Version, Processor Type and Configuration Register
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DNS, TFTP, DHCP, SNMP, RIP
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This applicaton layer protocol use UDP
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config-register 0x2101
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Set the register to default boot
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ctrl + break
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Enter rom monitor
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confreg 0x2141
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Set the config register in rom monitor to boot without loading the startup-config
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boot system flash c2800nm-.....bin
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Select the IOS Image in flash which should be used the next time the router boots
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boot system tftp c2800nm-....bin
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Select the IOS Image on TFTP Server which should be used the next time the router boots
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show flash:
show nvram: |
Shows files in Flash and NVRAM
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cd nvram:
cd system: |
Changes directory to nvram
Changes directory to RAM |
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delete
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Zapping files on Router file system
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show flash:
show nvram: |
Shows files in Flash and NVRAM
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cd nvram:
cd system: |
Changes directory to nvram
Changes directory to RAM |
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delete
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Zapping files on Router file system
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copy tftp running-config
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Restore configuration from TFTP server
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sh cdp neighbors
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Shows Device ID (hostname), Localinterf. Capability (S, R, I), Platform and Port ID of adjacent devices.
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sh cdp neighbors detail
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Shows all of "sh cdp neighbor" plus the IP address and IOS version of the neighbor
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sh cdp entry * protocol
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Lists Device Name of neighbor device plus its IP address
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sh cdp interface
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Shows the encapsulation of neighboring devices
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no cdp run
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Disables CDP
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terminal monitor
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This command turns on console messages if logging in on a IOS device via telnet
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sh sessions
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Displays the telnet sessions made from a router to a remote device
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sh users
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Shows a list of active console and VTY ports in use on your router
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ip domain-lookup
ip name-server [192.168.10.100] ip domain-name [cisco.com] |
Configure IOS to use DNS resolution
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debug ip rip
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Debugging the RIP protocol
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undebug all
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Disables all debugging commands (alternative no debug all)
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sh processes
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Displays amongst other things, the CPU utilization
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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
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