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Protocol Analysis of Network Segments

Can a Protocol Analyser see all of the segments of my network (can a Protocol Analyser work over a WAN)?

No.

Protocol Analysers can only view and collect traffic from the segment where the Protocol Analyser is located. To capture and analyse traffic from another segment (local multi-segment LAN or remote WAN), a distributed or multi-segment Protocol Analyser is required. Distributed analysers offer similar functionality to a standard (non-distributed) Protocol Analyser, displaying multiple diagnostic windows, each representing a segment on your LAN - all from a single management station. Typically, distributed Protocol Analysers consist of a software based management station and ether software or hardware based probes allowing an administrator to "view" any segment that hosts a probe.