23. A security attack that makes users unable to access a service is called_______.
(A) DoD
(B) DoS
(C) zombie
(D) DnS
(E) DDS

24. A binary tree can be described as a one dimensional array which level-wise retains all nodes from the root. Consider the following 1-D array as a binary tree and the following statements. (a) If the root is at level 0, the height of the binary tree is 3 (b) The left-child of A[i] is A[2i-1] (c) Post-order traversal of the tree (left-node first): H,U,S,A,N,G,I,O,K (d) In-order traversal of the tree (left-node first): H,A,S,U,K,N,I,G,O (e) The average search complex of such binary trees is O(n) Which of the above statements is CORRECT? (A) (a)(b)(d) (B) (b)(c)(d) (C) (a)(c)(d) (D) (a)(c)(e) (E) (a)(b)(c)(d)(e)

25. Consider the following C code and the statements ( A )~( E ).(a) myfunc(1)=1(b) myfunc(3)=3(c) myfunc(-1)=0 (d) myfunc(5)=8 (e) myfunc(8)=55 Which of the above statements is CORRECT? (A) (a)(b)(c)(d)(e) (B) (a)(b)(d)(e) (C) (b)(d)(e) (D) (a)(b)(d) (E) (b)(c)(d)(e)

26. According to the following routing table, where will the router send a packet destined for 10.1.5.65? (A) Directly connected (B) 10.1.1.2 (C) 10.1.2.2 (D) 10.1.3.3 (E) 10.1.4.4

27. Which of the following statement is INCORRECT? (A) NAT (Network Address Translation) allows multiple hosts to share an external IP simultaneously (B) DHCP allows multiple devices to share multiple IPs dynamically (C) NAT provides a type of firewall (D) DHCP also provides a type of firewall (E) All of the above are correct

28. Which of the following can be used in both error detections and error corrections in digital communications? (A) Hamming codes (B) Parity check (C) Checksum (D) Cyclic redundancy check (E) Manchester code

29. What is the postfix of the expression A + B * C / (D - E)? (A) A B C * D E - / + (B) A B C D E - / * + (C) A * B C / D E - + (D) + A / * B C - D E (E) + /A * B C - D E

30. The gradient descent has been run for 15 iterations with learning rate a=0.3 and the corresponding loss function J (theta) is computed after each iteration. You find that the value of J (Theta) decreases quickly and then levels off. Based on this observation, which one of the following conclusion seems most plausible? (A) Rather than using the current value of a, use a larger value of a (say a=1.0) (B) Rather than using the current value of a, use a smaller value of a (say a=0.1) (C) a=0.3 is an effective choice of learning rate (D) Overfitting. Rather than using the current definition of J, a better loss function of J shall be chosen. (E) None of the above

21. 為確保藝術才能班學生之專長領域學習品質，舞蹈班於第二學習階段每週平均學習節數為 多少節？ (A) 7 至 9 節 (B) 8 至 11 節 (C) 9 至 10 節 (D) 12 至 14 節

22. 為獎勵具有卓越藝術成就，且持續創作或展演的傑出藝文工作者，由國藝會自 1997 年起 每年辦理「國家文藝獎」，2015 年起調整為每兩年辦理一次，得主可獲得獎金壹佰萬元及 獎座。請問 2020 年第二十一屆「國家文藝獎」舞蹈類獲獎者，是下列哪一位舞蹈家？ (A) 何曉玫 (B) 古名伸 (C) 姚淑芬 (D) 許芳宜

23. 下列哪一個芭蕾術語是根據知名雕像水神像馬裘利（Mercure）所創的舞姿？ (A) Arabesque (B) Attitude (C) Passé (D) Épaulement

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