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networking & Linux

OSI model 7layers (peer -to - peer) / TCP 4 layers
pvt vs public ip (logical address)
ports eg:8080, 443
difference between OSI and tcp/ip layer
services eg:http,ftp

ipv4 - 32bits /ipv6-128 bits
A 1-126

128.2(32).2(32).2(32) =16,777,214 (hosts)

254+(1)=255(hosts) (+ 1+255) Networks

mssql ,mysql (3308)

purpose: to identify the different applications on single PC
2 types
physical ports eg:usb ports, ethernet port,hdmi ports etc
virtual ports
associated with ip address of the host as well as type of protocol used for communication
range : 1 to 65,535
3 types:
well known ports- 1 - 1023 assigned by IANA (443
Registered ports -> 1024-49151
dynamic cum private ports -> 49152- 65535

30-35 ports used for interview





switch, mac, nic, bridges

hub,cables,usb,ethernet,lan topologies,msau

NIC -> 16 bits mac address


wholesaler distributor
the path taken through the network to get the target machine
tracert or traceroute

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