[e2e] queriable networks

[Joe Touch]

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Dave Crocker wrote:
> 
> 
>> One place where I depart from a common view of the end to end argument is
>>  that there are times when it makes sense to actively enquire of the
>> network and expect the network to make a response that characterizes
>> itself.

(responding more to Fred than to Dave, but with Dave's subject thread):

This presumes two things:

1) if you ask the question, you actually want the answer

Problems include:
	- answers aren't necessarily meaningful by the time they're used
	- answers apply to the path the question takes, which may not
	  match the path the next question or action takes

2) if you ask the question, you can trust the answer

Problems include:
	- security (spoofing, malicious behavior, etc.)
	- accuracy (even in a benign system)
	- relevance of the answer to your own situation
	  i.e., having all drivers respond to uniform traffic reports
	  causes traffic to oscillate rather than distribute


Joe
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