63. Which of the following is used to convert between an IP address and a mnemonic address？
(A) File server
(B) Mail server
(C) Name server
(D) FTP server

64. What is the output result of the following program？(A) 1.00 (B) 2.10 (C) 6.90 (D) 1.10

65. What is the output of the following code？(A) 64 (B) -64 (C) 128 (D) -128

66. What is the output of the following code？ (A) 1 2 3 4 (B) 1 0 2 0 (C) 1 0 0 0 (D) 0 0 0 0

67. What is the output of the following code in a 64-bits OS computer？(A) 36 An apple a day keeps the doctor away. (B) 8 An apple a (C) 9 An apple a (D) 10 An apple a

68. Which one of the following descriptions about array is WRONG？ (A) An array is a data structure consisting of a collection of elements, where all elements are with same memory size. (B) In C language, an array is a contiguous memory block. (C) Each element in an array is identified by a key. (D) It is impossible to simulate a multi-dimensional array with a one-dimensional array.

69. Height of a tree is defined as the length of the path from its root to its farthest leaf node. Now given a binary tree with n nodes, which one of the following is the longest height of the tree？ (A) log n (B) n log n (C) n – 1 (D) n2

70. Which one of the following descriptions of NP-Completeness is WRONG？ (A) An NP-Complete problem is also an NP-Hard problem. (B) Given an NP-Complete problem, the correctness of each solution can be verified in polynomial time. (C) An NP-Complete problem can be reducible to every problem in NP. (D) If an NP-Complete problem can be solved in polynomial time, it implies P=NP.

71. Two’s complement is an approach to represent a signed number. Given an 8-bit number as follows 1011 0010, what is the decimal value of this number？ (A) 77 (B) -77 (C) 78 (D) -78

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.

73. The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free topology for Ethernet networks. Which one of the following problems can be solved by STP？ (A) Hidden Terminal Problem (B) Ping-pong Effect (C) ARP Spoofing Attack (D) Broadcast Storming

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