what is protocol ? Explanations by neeraj

protocols are the set of rules for communications

ip network (connction less) mtu : 1500 (64-1500)
tcp transport (connection oriented) ack
udp transport (less) no ack
ftp app (file transfer protocol)
sftp app (secure ftp)
tftp app (trivial ftp)
smtp app (simple mail transfer ptotocol)
http app (hyper text transfer ptotocol)
https app (http via ssl)
pop3 app(post office protocol)
imapv4 app (internet mail access protocol)
telnet app (remote login)
ssh app (secure shell)
icmp net (ping)
arp dll (ip-mac) arp -a
rarp dll (mac-ip)
ntp app (network time protocol)
nntp app (network news transfer protocol)
scp secure copy protocol app
ldap app (light weight directory acccess protocol)
igmp network (internet group messenging protocol) 224-239
tls(transport layer security) app
sip(session initiation protocol) app
rtp (real time transport protocol) app

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