NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JULY 2017 EXAMINATION

COURSE CODE: CIT 461
COURSE TITLE: INTERNET ARCHITECTURE & COMMUNICATIONS
TIME ALLOWED: 2 HOURS
INSTRUCTION: Answer any four (4) Questions


1a. Write short note on any security measures for E-Business systems (4.5 marks)
1b. Explain Internet Protocol (5 marks)
1c. Explain class C and D of IP Addresses (8 marks)


2a. Explain Internet Control Message Protocol (ICMP) (4 marks)
2b. State and discuss two primary responsibilities IP (6 marks)
2c. State five (5) useful messages generated by Internet Control Message Protocol (ICMP) (7.5 marks)


3a. State the two types of simple connection (2.5 marks)
3b. Write short note on two fields of IP Addresses (6 marks)
3c. Write short note on the following:
i. Bridges
ii. Brouters
iii. Gateway


4a. Explain class E of IP Address (4 marks)
4b. Write short note on IP Address (4.5 marks)
4c. List and explain the two popular approaches to packet switching (9 marks)


5a. State two advantages of Message switching and one dis advantage of Cell switching of Packet Switched Systems (4.5 marks)
5b. List and explain the two types of Ethernet Hubs (6 marks)
5c. Describe classes A and B of IP Addresses (7 marks)


6a. State three main equipment required for internet access (2.5 marks)
6b. Explain Multicasting (6 marks)
6c. Write short note on the four levels of ISPs (9 marks)


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