Acronym for Global Server Load Balancing
GSLB is load balancing multiple POPs/sites, trying to give users closer access to the content, rather than just rrDNS. It's supposed to be more intelligent.
a GSLB is usually a device which is a DNS server that also knows about load on the POP?s, similar to an L4 Switch?, so can swing traffic to the one which is loaded least, etc.
See also:
No page links to GSLB.
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