Which of the following software allows a network administrator to inspect the protocol header in order to
troubleshoot network issues?
Every data packet transmitted across a network has a protocol header. To view a protocol header, you need to
capture and view the contents of the packet with a packet sniffer.
A sniffer (packet sniffer) is a tool that intercepts data flowing in a network. If computers are connected to a local
area network that is not filtered or switched, the traffic can be broadcast to all computers contained in the same
segment. This doesn’t generally occur, since computers are generally told to ignore all the comings and goings
of traffic from other computers. However, in the case of a sniffer, all traffic is shared when the sniffer software
commands the Network Interface Card (NIC) to stop ignoring the traffic. The NIC is put into promiscuous mode,
and it reads communications between computers within a particular segment. This allows the sniffer to seize
everything that is flowing in the network, which can lead to the unauthorized access of sensitive data. A packet
sniffer can take the form of either a hardware or software solution. A sniffer is also known as a packet analyzer.