URN
example: resolver discovery (across), resolver query (down)
URN part1
server b1
URLn
page
(redirect)
URLb
URLc
. . .
. . .
. . .
id-a1
id-b1
id-b2
id-a2
id-c1
id-c2
id-b1
id-b2
id-n2
id-n1
Browser discovers resolver
with DNS NAPTR query manager using name authority prefix
found in URN, combines result with URN to form URLb, then
attempts to get page URLb
User