Consider building a CSMA/CD network running at 100Mbps over ..

第1题

迦太基

A、Cage

B、Phoenician

C、Carthage

D、Capitoline

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第2题

Groups who try to persuade Congressmen to vote for or against a bill are known as _________.

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第3题

Why we need media access control? Please list two or more media access control methods.

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第4题

A channel has a bit rate of 64 kbps and a propagation delay of 2 msec. For what range of frame sizes does stop-and-wait give an efficiency of at least 80 percent?

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第5题

In a subnet, distance vector routing is used, and the following vectors have just come in to router D: from B: (5, 0, 8, 12, 6, 2); from C: (16, 12, 0, 6, 9, 10); and from E: (7, 6, 3, 9, 0, 4). The measured delays to B, C, and E, are 6, 8, and 5, respectively. What is D's new routing table? Give both the outgoing line to use and the expected delay.

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第6题

A router has the following entries in its routing table: Address/Mask Next hop 130.96.39.0/24 Interface 1 130.96.39.128/25 Interface 0 130.96.40.0/25 Router 1 192.4.10.0/23 Router 2 Default Router 3 For each of the following IP addresses, what does the router do if a packet with that address arrives? Please state why you choose it. 1) 192.4.11.172 2) 130.96.39.135 3) 130.96.39.96 4) 130.96.40.168 5) 130.96.40.64

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第7题

二、将下列英文短句译为中文（每小题3分，共15分） 1. Figure 3 Characterization of the VLPs by PGM ELISA to detect their binding to HBGA. 2. Table 1 Preparation of the standard curve template for one-step RT-PCR. 3. There is a considerable interest in the isolation of microbes able to thrive in high concentrations of organic solvents. 4. The crystal structure showed this protein interacting with the citrate molecule through seven hydrogen bonding interactions. 5. The more zoologists learn about animals, the more diverse and complex the field of zoology becomes.

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第8题

A bit stream 0110110 is transmitted using CRC method. The generator polynomial is x3+ x2+1. a) How many check bits should be added? b) Show the actual bit string transmitted by the sender end. c) Suppose that the second bit from the left is inverted during transmission. Show that this error will be detected by the receiver.

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第9题

一、将下列英文专业术语与其英文解释配对，并将配对结果填在英文专业术语后的括号内（每小题2分，共30分） 1. receptor ( ) 2. noncellular ( ) 3. telomere ( ) 4. genomic mapping ( ) 5. splicing ( ) 6. vascular bundle ( ) 7. transcription ( ) 8. taxnomy ( ) 9. biodiversity ( ) 10. pentose phophate pathway ( ) 11. Taq polymerase ( ) 12. ecotone ( ) 13. cofactor ( ) 14. meristem ( ) 15. lymphatic system ( ) a) a part of the transport system in vascular plants. b) a thermostable DNA polymerase named after the thermophilic bacterium Thermus aquaticus. c) a process that generates NADPH and pentoses. d) a part of protein sequence and structure that can evolve, function, and exist independently of the rest of the protein chain. e) a substance that needs to be present in addition to an enzyme for a certain reaction to be catalysed. f) a modification of an RNA after transcription, in which introns are removed and exons are joined. g) also referred to as expression profiling, the study of examination of the expression level of mRNAs in a given cell population. h) the full-scale of life and its processes. i) a chemical group or molecule (as a protein) on the surface or in the cell interior that has an affinity for a specific chemical group, molecule, or virus. j) long stretches of repetitives sequences in the eukaryotic chromosome. k) studies the code of life. l) the process of DNA convetring into mRNA. m) the part of the immune system comprising a network of conduits called lumphatic vessels. n) a transition area between two adjacent but different patches of landscape, such as forest and grassland. o) the tissue in most plants consisting of undifferentiated cells. p) the applied science or the biosocial movement which advocates the use of practices aimed at improveing the genetic composition of a population. q) wihout a cell structure. r) the set of rules by which information encoded in genetic material (DNA or mRNA sequences) is translated into proteins (amino acid sequences) by living cells. s) the practice and science of classification. t) the creation of a genetic map assigning DNA fragments to chromosomes.

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III. Computation: C1-5. （55 points in total ). Th...