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22 Cards in this Set
- Front
- Back
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describe : cisco ios
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cisco internetwork operating system
-used regardless of type or size of device. - used for routers, switches, wireless access points - provides basic routing and switching functions - secure/reliable access - scalability - accessed via CLI - contents are stored in flash - copies data to RAM during powerup and runs from RAM. |
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methods to access to CLI
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- telnet (vty sessions)
- ssh - stronger password authentication than telnet. - console (CTY line). Provides out-of-band access to a router. - aux (modem connection) |
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startup config file
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configuration file that is parsed when the system is booted. Also known as the backup configuration. Stored in NVRAM and loaded to RAM
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running configuration file
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used during the current operation of the device. RAM copy of the startup configuration. Changes to this will immediately affect the operation.
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define modal
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a system where there are different modes of operation.
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major modes in the CLI
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- user executive mode - priviledged executive mode
- global configuration mode - other specific config mode |
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CLI prompt consists of:
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- device name
- mode |
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user exec mode
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(limited capabilities, view only mode, indicated by >)
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priviledged exec mode
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can execute confguration and management commands.
indicated by # default doesn't require authentication unless configured. |
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enable
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is used to switch between user and priviledge modes.
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italics
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argument
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square brackets
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optional element
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choice within an optional or required keywords or arguments
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{x|y}
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reqyured choice
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ios in ram has:
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programs (show processes, cpu, protocols)
tables and buffers (show memory, stack, buffers) active configuration file |
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NVRAM
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backup configuration file
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flash
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OS
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specific config modes
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interface
line router |
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name of a device
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max 63 chars
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disable
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return from priviledge to user exec mode
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syntax format
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command keywords arguments
commands are not case sensitive keywords are used to define the particular output arguments are used defined. |
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syntax characteristics
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boldface: command and keyword entered as shown.
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