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7.1. Which of the following mechanisms are correct for IP (Internet Protocol) service model ?
下列哪些對於IP 服務模型的敘述是正確的 ?
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| (a) IP is connectionless service model IP服務模型是無連線模式 | |
| (b) IP is connection-oriented service model IP服務模型是連線導向模式 | |
| (c) IP provides best-effort (unreliable) service IP提供盡力式服務 | |
| (d) IP provides reliable service IP 提供可靠的服務 | |
| (e) IP provides global addressing scheme to identify all hosts in the Internet IP 提供全球定址機制以識別所有在網路中的主機 |
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7.2. Which of the following events may happen when datagrams (packets) are delivered by the IP service in the Internet ?
當封包經由IP服務在互聯網上被傳遞時,下列哪些事情可能發生?
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| (a) Packets may be dropped by routers 封包可能被路由器丟棄 | |
| (b) Packets may be delivered out of order 封包傳遞順序可能紊亂 | |
| (c) Routers will retransmit packets if they are dropped by routers 如果封包被丟棄,路由器會再次傳送封包 | |
| (d) No duplicate copies of a packet may be delivered simultaneously in the Internet 不會有重複的封包同時在互聯網上被傳遞 | |
| (e) Packets can be delayed for a long time 封包可能被延遲很長一段時間 |