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多項選擇題

What two situations could require the use of multiple routing protocols? ()

A. when all equipment is manufactured by Cisco
B. when there are multiple paths to destination networks
C. because having multiple routing protocols confuses hackers
D. when migrating from an older Interior Gateway Protocol (IGP) to a new IGP
E. when  using UNIX host - based routers
F. when smaller broadcast domains are desired

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