User guide

Internetworking Primer A-9
LANs and WANs
The interaction of the configuration commands is illustrated in Figure A-1.
Figure A-1 Configuration Command Interaction with Cisco IOS Release 11.0
LANs and WANs
This section briefly describes the common local-area network (LAN) and
wide-area network (WAN) technologies you may encounter when you are building an
internetwork. An important function of an access server is to interconnect LANs and
WANs.
To understand LANs and WANs, you should be familiar with the Open System
Interconnection (OSI) reference model of networks. The OSI reference model is a
seven-layer model designed by the International Organization for Standardization (ISO)
and the International Telecommunications Union Standardization Sector (ITU-T) to aid in
the development and understanding of computer networking and communications. The OSI
reference model divides the issue of moving information between computers into seven
layers.
H3845
show
startup-config
NVRAM
erase
startup-config
To delete
contents
config term
show running-config
config mem
copy running-config
startup-config
copy tftp
running-config
copy running-
config tftp
Working storage for
the active configuration
TFTP
server
RAM