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minhdh
08-08-2004, 18:06
Chương trình thi lấy chứng chỉ CNTT của Nhật Bản. Để biết thêm thông tin mới tham khảo website: http://www.vitec.org.vn/

Mọi người tải tài liệu về nhé
http://hrdn.free2w.com/Documents.zip

Đây là mẫu đăng ký dự thi
http://hrdn.free2w.com/Registry.zip

Đề thi một số năm trước
http://hrdn.free2w.com/ExamPapers.zip

Mong mọi người tham gia nhiệt tình. Tham khảo đường link trong diễn đàn http://www.diendantinhoc.com/showthread.htm?t=21150&page=2&pp=15

minhdh
08-08-2004, 18:24
Mọi người cùng tham gia tra lời nhé. Trước hết là một số câu hỏi về phần mạng (Networking)
(Đề thi 10/2003)

Q.58 If a network is constructed in a TCP/IP environment, the more clients there are, the more complex it is to manage the related IP addresses. Which of the following protocols simplifies IP address management by dynamically assigning an IP address at the request of a client?
a) DHCP b) HTTP c) LDAP d) SNMP

Q.59 Which of the following is a correct description of the “network layer” in the OSI basic reference model?
a) The network layer establishes and frees routes and connections to achieve transparent data transfer between end systems.
b) Of all the layers, the network layer is closest to users and used for diverse applications, such as file transfer, electronic mail, etc.
c) The network layer absorbs the differences in characteristics of physical communication media and provides higher-level layers with a transparent transmission line.
d) The network layer provides a control procedure for data transfer between adjacent nodes (error detection, re-send control, and so forth).

Q.60 Which of the following is an advantage of connection-oriented protocol over connectionless protocol?
a) Assures packet delivery
b) Requires response from receivers
c) Transmits data more rapidly
d) Transmits data more securely

Q.61 How many bits per second is the minimum required line capacity in order to transmit 6k-byte data (excluding control codes) within 5 seconds? Assume that no control code is taken into consideration, that the transmission efficiency of the line is 60%, and that 1 k = 1,024.
a) 1,200 b) 4,800 c) 9,600 d.) 19,200

Q.62 Which of the following is a correct description of the basic ISDN interface?
a) It consists of two information (B) channels, each of 64k bits/second, and one signal (D) channel of 16k bits/second.
b) The information (B) channels provide packet-switching service only.
c) The signal (D) channel is a channel for communication control and cannot be used for data transmission.
d)If a bus-type wiring configuration is used at the site of a user, two or more computers can be connected to this interface on the condition that these computers are of the same type.


Q.63 Which of the following values is closest to the line usage rate (%) when transferring files that average 1,000 bytes in length at even intervals 0.6 times per second between terminals connected by a 64kbps leased line? Assume that control information equivalent to 15% of the amount of data being transferred is added to each file transfer.
a) 1.1
b) 7.5
c) 8.6
d) 24.0

Q.64 Of the devices shown below, which one links two LANs in the physical-layer level of the OSI basic reference model?
a) Transceiver b) Bridge c) Repeater d) Router

Q.65 Which of the following is a correct description of modem (modulator/demodulator)?
a) A DSU used on a digital transmission line is a type of modem.
b) RS-232C is one of the typical interfaces used to connect modems to terminal devices.
c) A modulation method for digital-analog conversion used by modems is the PCM (Pulse Code Modulation) method.
d) bps (bits per second) is used as a unit of the modulation rate that shows the level of modem performance.