下面描述正确的是(49)。
- A．数字签名技术用来保证数据在传输过程中的安全性
- B．数字信封技术用来保证数据在传输过程中的完整性
- C．电子支票只要第二方认证就可以使用
- D．以上都不对
-
(38)
- A．but rather
- B．rather too
- C．rather than
- D．rather that
-
(37)
- A．Bellman-Ford
- B．Ford-Fulkerson
- C．Dijkstra
- D．RIP
-
(36)
- A．more
- B．less
- C．same
- D．most
-
(35)
- A．derived from
- B．deviated from
- C．was derived from
- D．was deviated from
-
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
Open Shortest Path First(OSPF)is a(71)routing algorithm that(72)work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires(73)processing power. The(74)algorithm is used to calculate routes. OSPF routing table updates only take place when necessary,(75)at regular intervals.
- A．distance-vector
- B．link-state
- C．flow-based
- D．selective flooding
-
(32)
- A．charged
- B．fined
- C．free
- D．controlled
-
(33)
- A．point
- B．start
- C．length
- D．end
-
(31)
- A．computing
- B．incurious
- C．incurved
- D．incurred
-
(30)
- A．long
- B．short
- C．large
- D．small
-
Packet-switching wireless networks are preferable(66)when transmissions are(67)bemuse of the way charges are(68)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(69)for the(70)of time they use the network.
- A．to
- B．for
- C．than
- D．only
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