cisco
Help!
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| Router> | User mode
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| Router# | Privileged mode
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| Router(config)# | Global configuration mode
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| Router(config-if)# | Interface mode
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| Router(config-subif)# | Subinterface mode
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| Router(config-line)# | Line mode
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| Router(config-router)# | Router configuration mode
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| Router> | Can see config, but not change
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| Router# | Can see config and move to make
changes
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| Router#config t Router(config)# | Moves to global config mode
This prompt indicates that you can
start making changes
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| Router(config)#hostname Cisco Cisco(config)# | Name can be any word you choose
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| Router(config)#enable password cisco | Sets enable password
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| Router(config)#enable secret class | Sets enable secret password
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| Router(config)#line con 0 Router(config-line)#password console Router(config-line)#login | Enters console-line mode
Sets console-line mode password to
console
Enables password checking at login
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| Router(config)#line vty 0 4 Router(config-line)#password telnet Router(config-line)#login | Enters vty line mode for all 5 vty
lines
Sets vty password to telnet
Enables password checking at login
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| Router(config)#line aux 0 Router(config-line)#password backdoor Enables password checking at login | Enters auxiliary line mode
Sets auxiliary line mode password to
backdoor
Enables password checking at login
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| Router(config)#service passwordencryption | Applies a weak encryption to
passwords
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| Router(config)#enable password cisco | Sets enable password to cisco
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| Router(config)#line con 0 | 0
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| Router(config-line)#password Cisco | Continue setting passwords as above
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| Router(config)#no service passwordencryption | Turns off password encryption
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| Router#show ? | Lists all show commands available
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| Router#show interfaces | Displays statistics for all interfaces
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| Router#show interface serial 0 | Displays statistics for a specific
interface, in this case Serial 0
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| Displays statistics for a specific interface, in this case Serial 0 | Displays a summary of all
interfaces, including status and IP
address assigned
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| Router#show controllers serial 0 | Displays statistics for interface
hardware. Statistics display if the
clock rate is set and if the cable is
DCE, DTE, or not attached
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| Router#show clock | Displays time set on device
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| Router#show hosts | Displays local host-to-IP address
cache. These are the names and
addresses of hosts on the network to
which you can connect
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| Router#show users | Displays all users connected to
device
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| Router#show history | Displays history of commands used
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| Router#show flash | Displays info about Flash memory
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| Router#show version | Displays info about loaded
software version
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| Router#show arp | Displays the ARP table
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| Router#show protocols | Displays status of configured Layer
3 protocols
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| Router#show startup-config | Displays configuration saved in
NVRAM
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| Router#show running-config | Displays configuration currently
running in RAM
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| Router(config)#int s0 Router(config)#int s0 | Moves to interface S0
mode
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| Router(config-if)#exit Router(config-if)#int e0 | In int S0, move to E0
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| Router(config)#int e0 | Prompt does not
change; be careful
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| Router(config)#int s0/0 | Moves to interface Serial 0/0
mode
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| Router(config-if)#description Link to ISP | Optional descriptor of the link is
locally significant
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| Router(config-if)#ip address 192.168.10.1 255.255.255.0 | Assigns address and subnet
mask to interface
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| Router(config-if)#clock rate 56000 | Assigns a clock rate for the
interface
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| Router(config-if)#no shut | Turns interface on
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| Router(config)#int fa0/0 | Moves to Fast Ethernet 0/0
interface mode
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| Router(config-if)#description Accounting LAN | Optional descriptor of the
link is locally significant
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| Router(config-if)#ip address 192.168.20.1 255.255.255.0 | Assigns address and subnet
mask to interface
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| Router(config-if)#no shut | Turns interface on
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| Router(config)#banner motd # This is a secure system. Authorized Personnel Only! # Router(config)# | # is known as a delimiting
character. The delimiting
character must surround the
banner message and can be
any character so long as it is
not a character used within
the body of the message
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| Router(config)#clock timezone EST –5 | Sets the time zone for
display purposes. Based on
coordinated universal time
(Eastern Standard Time is 5
hours behind UTC)
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| Router(config)#ip host london 172.16.1.3 | Assigns a host name to the
IP address. After this
assignment, you can use the
host name instead of an IP
address when trying to
Telnet or ping to that
address
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| Router#ping london = Router#ping 172.16.1.3 | TIP: The default port number in the ip host command is 23, or Telnet. If you want
to Telnet to a device, just enter the IP host name itself:
Router#london = Router#telnet london = Router#telnet 172.16.1.3
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| Router(config)#no ip domain-lookup Router(config)# | Turns off trying to
automatically resolve an
unrecognized command to a
local host name
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| Router(config)#line con 0 Router(config-line)#logging synchronous | Turns on synchronous
logging. Information items
sent to console will not
interrupt the command you
are typing. The command
will be moved to a new line
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| Router(config)#line con 0 Router(config-line)#exec-timeout 0 0 Router(config-line)# | Sets time limit when console
automatically logs off. Set to
0 0 (minutes seconds) means
console never logs off
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| Router#copy run start | Saves the running-config to local NVRAM
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| Router#copy run tftp | Saves the running-config remotely to TFTP server
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| Router#erase start | Deletes the startup-config file from NVRAM
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| Router>en | Enters privileged mode
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| Router#clock set 18:30:00 15 Nov 2004 | Sets local time on router
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| Router#config t | Enters global config mode
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| Router(config)#hostname Boston | Sets router name to Boston
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| Boston(config)#no ip domain-lookup | Turns off name resolution on
unrecog-nized commands
(spelling mistakes)
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| Boston(config)#banner motd # This is the Boston Router. Authorized Access Only # | Creates an MOTD banner
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| Boston(config)#clock timezone EST –5 | Sets time zone to Eastern
Standard Time (–5 from UTC)
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| Boston(config)#enable secret cisco | Enable secret password set to
cisco
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| Boston(config)#service password-encryption | Passwords will be given weak
encryption
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| Boston(config)#line con 0 | Enters line console mode
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| Boston(config-line)#logging sync | Commands will not be
interrupted by unsolicited
messages
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| Boston(config-line)#password class | Sets password to class
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| Boston(config-line)#login | Enables password checking at
login
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| Boston(config-line)#line vty 0 4 | Moves to virtual Telnet lines 0
through 4
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| Boston(config-line)#password class | Sets password to class
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| Boston(config-line)#login | Enables password checking at
login
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| Boston(config-line)#line aux 0 | Moves to line auxiliary mode
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| Boston(config-line)#password class | Sets password to class
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| Boston(config-line)#login | Enables password checking at
login
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| Boston(config-line)#exit | Moves back to global config
mode
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| Boston(config)#no service passwordencryption | Turns off password encryption
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| Boston(config)#int fa 0/0 | Moves to Fast Ethernet 0/0
mode
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| Boston(config-if)#desc Engineering LAN | Sets locally significant
description of the interface
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| Boston(config-if)#ip address 172.16.10.1 255.255.255.0 | Assigns IP address and subnet
mask to the interface
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| Boston(config-if)#no shut | Turns on the interface
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| Boston(config-if)#int s0/0 | Moves directly to Serial 0/0
mode
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| Boston(config-if)#desc Link to Buffalo Router | Sets locally significant
description of the interface
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| Boston(config-if)#ip address 172.16.20.1 255.255.255.0 | Assigns IP address and subnet
mask to the interface
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| Boston(config-if)#clock rate 56000 | Sets a clock rate for serial
transmission (DCE cable must
be plugged into this interface)
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| Boston(config-if)#no shut | Turns on the interface
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| Boston(config-if)#exit | Moves back to global config
mode
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| Boston(config)#ip host buffalo 172.16.20.2 | Sets a local host name
resolution to IP address
172.16.20.2
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| Boston(config)#exit | Moves back to privileged
mode
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| Boston#copy run start | Saves running-config to
NVRAM
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