試題詳解

72. IP networks are often described as “best-effort” networks. Which one of the following descriptions about “best-effort” is correct？
(A) “Best-effort” implies reliable delivery.
(B) “Best-effort-delivery” does not provide any guarantee about quality of service.
(C) “Best-effort” means secure delivery where all packets are encrypted when transmission.
(D) “Best-effort-delivery” guarantees that all packets are received in order.