this is all i remember, but can give you some important information on cisco ios 11.2 commands.
steps of data encapsulation:
1.user information is converted to data
2.data converted to segments
3.segments converted to packets or datagrams
4.packets and datagrams are converted to frames
5.frames are converted to bits
frame types:
802.3 – novell-ether – default
802.2 – sap
ethernet_ii – arpa
ethernet_snap – snap
switching – examines mac address.
store-and-forward – copies entire frame into buffer, checks for crc
errors. higher latency. used by catalyst 5000 switches
cut-through – reads only the destination address into buffer, and
forwards immediately. low latency
virtual lan’s – have different ports on a switch be parts of different subnetworks. some benefits: simplify moves, adds, changes. reduce administrative costs, better control of broadcasts, tighten security, and distribute load. relocate server into secured locations.
cisco ios (operating system) is stored in flash memory (eeprom)
ios configuration is stored in nvram
user mode – ordinary tasks – checking status, etc. need password depending on how you’re entering (virtual terminal pw for telnet session, auxiliary pw for aux port, console pw for console port)