Found 3 books

Packet Guide to Routing and Switching

[en] Packet Guide to Routing and Switching O'Reilly

Hartpence, Bruce

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Packet Guide to Voice Over IP

[en] Packet Guide to Voice Over IP O'Reilly Media

Hartpence, Bruce

download read it!
Packet Guide to Core Network Protocols

[en] Packet Guide to Core Network Protocols O'Reilly Media

Hartpence, Bruce

download read it!