A Packet Analyzer is able to do all of the following except __. A packet analyzer, or more commonly known as a network sniffer, can be used for many things including monitoring and troubleshooting networks. However, there are some features that it cannot do such as an ARP cache dump.
As with any program they come with their own sets of pros and cons which may include:
It does not have filtering capabilities. Filtering on specific ports within programs like telnet requires user input in order to filter effectively.
The communication between two hosts being monitored needs to stay open for packets to be captured unless this is done through promiscuous mode.