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CCNA Routing and Switching Complete Study Guide Exam 100-105, Exam 200-105, Exam 200-125 ( PDFDrive )

Exam Essentials
Define the Cisco router components.
Describe the functions of the bootstrap, POST, ROM monitor, mini-IOS,
RAM, ROM, flash memory, NVRAM, and the configuration register.
254


Identify the steps in the router boot sequence.
The steps in the boot sequence are POST, loading the IOS,
and copying the startup configuration from NVRAM to RAM.
Save the configuration of a router or switch.
There are a couple of ways to do this, but the most common
method, as well as the most tested, is 
copy running-config startup-config
.
Erase the configuration of a router or switch.
Type the privileged-mode command 
erase startup-config
and reload the router.
Understand the various levels of syslog.
It’s rather simple to configure syslog; however, there are a bunch of
options you have to remember for the exam. To configure basic syslog with 
debugging
as the default level, it’s
just this one command:
SF(config)#
logging 172.16.10.1
However, you must remember all eight options:
SF(config)#
logging trap ?
<0-7> Logging severity level
alerts Immediate action needed (severity=1)
critical Critical conditions (severity=2)
debugging Debugging messages (severity=7)
emergencies System is unusable (severity=0)
errors Error conditions (severity=3)
informational Informational messages (severity=6)
notifications Normal but significant conditions (severity=5)
warnings Warning conditions (severity=4)

Understand how to configure NTP.
It’s pretty simple to configure NTP, just like it was syslog, but we don’t have
to remember a bunch of options! It’s just telling the syslog to mark the time and date and enabling NTP:
SF(config)#

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