Cisco router basic knowledge-storage details

Cisco router has become a commonly used network device, but we are not very clear about its storage classification. Here we will introduce it in detail.

Memory category:

1: RAM: Random Access to memory, equivalent to computer memory

2: ROM: read-only memory. Some microcodes used to start and maintain the router are resident in the ROM.

3: FLASH Memory, equivalent to a computer's hard disk, stores IOS file Images

4: NVRAM: used to store STARTUP configuration files

Four execution modes:

1: User Mode: You can view but cannot change the vro settings

2: privileged mode: You can use some privileged commands to view more messages and change certain vro settings.

3: Global mode: You can change the vro settings and update the settings being executed in RAM.

4. other configuration modes: You can change the specific sub-configuration settings of the vro and update the settings being executed in RAM.

Password settings for different access methods:

Console port password settings

Router (config) # line console 0

Router (config-line) # login

Router (config-line) # password 123

Virtual port remote login:

Router (config) # line vty 0 4

Router (config-line) # login

Router (config-line) # password 123

0 4 indicates that virtual remote terminals 0 to 4 are allowed.

AUX port

Router (config) # line aux 0

Router (config-line) # login

Router (config-line) # password 123