CIT461 : Internet Architecture and Communications (2017_2)

NATIONAL OPEN UNIVERSITY OF NIGERIA,

University Village, Plot 91, Cadastral Zone, NnamdiAzikiwe Express Way, Jabi, Abuja

FACULTY OF SCIENCES

JULY 2017 EXAMINATION

Course code: CIT461
Course Title: Internet Architecture and Communications
Time: 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 classes C and D of IP Addresses.[8 marks]
 
2a.       Explain Internet Control Message Protocol (ICMP). [4 marks]
2b.       State and discuss two primaryresponsibilities of IP [6 marks]
2c.       State five (5) useful messagesgenerated by Internet Control Message Protocol (ICMP). [7.5 marks]
 
3a.       State the two types of simple internet connection. [2.5 marks]
3b.       Write short note on the two fields of IP Addresses [6 marks]
3c.       Write short note on the following:[9 marks]
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 disadvantage 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 equipmentrequired for internet access. [2.5 marks]
6b.       ExplainMulticasting.[6 marks]
6c.       Write short note on the four levels of ISPs. [9 marks]
You can get the soft copy for this course or the exam summary answers for this course from 08039407882

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