NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
OCTOBER 2019 EXAMINATION

COURSE CODE: DAM361
COURSE TITLE: BUSINESS COMMUNICATION AND NETWORKS
COURSE CREDIT: 2 UNITS
TIME ALLOWED: 2 HOURS
INSTRUCTION: ANSWER QUESTION 1 AND ANY OTHER THREE (3) QUESTIONS

1a) (i) Explain the basic components of a telecommunication system (3 marks)
(ii) Interpret the functions of a MODEM in data transmission (2 marks)
(b) (i) Identify four (4) standard organisations for telecommunications (4 marks)
(ii) How can a person become a member of a company? (3 marks)
(iii) Provide four (4) rights of a member included in the Company’s Act (4 marks)
(c) What name is given to the data packets produce at the following layers? (2 marks)
(d) Analyse any four (4) functions of the transport layer of the OSI model (4 marks)
(e) Determine the main components of a marketing plan? (3 marks)

2(a) Provide five (5) differences between CSMA/CA and CSMA/CD (6 marks)
2(b) Differentiate between MAC and IP addresses (5 marks)
2c. Write down four (4) categories of network standards (4 marks)

3a) Compare Switches to Routers in terms of their functionality in a network (6 marks)
b) Write short notes on these WAN protocols: Frame Relay and ISDN (4 marks)
c) Analyse five (5) advantages of optical fibre over copper cables (5 marks)

4a) Determine four (4) design issues that must be considered when implementing network model (4 marks)
b) Differentiate between simplex and half duplex modes of data transmission (4 marks)
c)(i) Analyse four (4) advantages of the layered network architecture (4 marks)
(ii) Itemise three (3) analyses that measure short-term marketing performance (3 marks)

5a.(i) Enumerate the layers of the TCP/IP network model (4 marks)
(ii) Provide three (3) uses of coaxial cable (3 marks)
b) Deduce what these IEEE standards specify
(i) IEEE802.3 (ii) IEE802.10 (iii) IEEE802.11 (6 marks)
c) Identify four (4) protocols used at the application layer of the OSI model (2 marks)