What precisely does it mean to tunnel in both directions simultaneously? Why is the HA-FA pair necessary in addition to the HLR-VLR pair?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter8: Data And Network Communication Technology
Section: Chapter Questions
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What precisely does it mean to tunnel in both directions simultaneously? Why is the HA-FA pair necessary in addition to the HLR-VLR pair?

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