09-30-2017
We had a trainee here, who'd accomplished some Cisco Certification (done via internet as it revealed later). Don't know exactly what it was. But she somehow managed to not even know how IPv4 works.
I read some offers here and there in the internet:" If you take our premium support offer you always get serviced by an >> LPIC Level 3 certified senior system administrator <<".
Especially the LPI Exams cost a lot of money if you want to keep them especially at a higher level. After 5 years you have to recertify.
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LEARN ABOUT OSF1
protocols
protocols(4) Kernel Interfaces Manual protocols(4)
NAME
protocols - Defines the Internet protocols used on the local host
SYNOPSIS
/etc/protocols
DESCRIPTION
The /etc/protocols file contains information about the known protocols used in the DARPA (Defense Advanced Research Projects Agency) Inter-
net. Each protocol is represented by a single line in the protocols file. Each entry is of the form: Name Number Aliases
The fields contain the following information: Official Internet protocol name. Protocol number. Unofficial names used for the protocol.
Items on a line are separated by one or more spaces or tab characters. Comments begin with the # (number sign), and routines that search
the protocols file do not interpret characters from the beginning of a comment to the end of the line. A protocol name can contain any
printable character except a field delimiter, newline character, or comment character.
The lines in the file appear as follows: # # Internet (IP) protocols # ip 0 IP # internet protocol, pseudo protocol number
icmp 1 ICMP # internet control message protocol igmp 2 IGMP # internet group management protocol ggp 3 GGP
# gateway-gateway protocol tcp 6 TCP # transmission control protocol egp 8 EGP # exterior gateway protocol pup
12 PUP # PARC universal packet protocol udp 17 UDP # user datagram protocol hmp 20 HMP # host monitoring
protocol rdp 27 RDP # "reliable datagram" protocol
RELATED INFORMATION
Functions: endprotoent(3), getprotobyname(3), getprotobynumber(3), getprotoent(3), setprotoent(3) delim off
protocols(4)