describe the various connectivity devices that operate at
the various layers of the OSI MODEL. also state the
challenges an admnistrator faces while using these devices

Answer Posted / shamim alam

physical layer...........hub, connecting devices
datalink layer...........switch
network layer............router,ip,arp,rarp,icmp
transport layer..........tcp,udp
applicatin layer..........ftp,smtp,tftp,pop,dns

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