NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY 2021 EXAMINATION

COURSE CODE: CIT305

COURSE CREDIT: 3

COURSE TITLE: NETWORKING AND COMMUNICATION TECHNOLOGY

TIME ALLOWED: 21 /2 HOURS

INSTRUCTION: ANSWER QUESTION ONE (1) AND ANY OTHER (4) QUESTIONS

1a) (i) Write on two commonly used wired technologies for transmitting data from one point to another (2 marks)

1a (ii) Outline any two categories of basic data-link configurations as used in the second layer of Open System Interconnection (OSI) reference model (3 marks)

1a (iii) What is the objective of validation process and test metrics in wireless LAN (2 marks)

1a (iv) Itemize the primary objectives of internet protocol as used in layer three of internet suites (2 marks)

1b Briefly describe the terms “enterprise private network” in configuring access rules in computer networking (3 marks)

1c (i) List any two common types of threats affecting enterprise network when connected to the internet. (2 marks)

1c (ii) State any three Standard design requirements used for effective network planning and design (3 marks)

1c (iii) Briefly describe the Significance of Digital Modulation in data communication (3 marks)

1c (iv) State the two general types of access offers by ISDN (2 marks)

2a Write short notes on the following Wireless LAN technologies as used in connecting devices for data transmission

(i) Communications satellites

(ii) Cellular and PCS systems

(iii) Infrared communication (6 marks)

2b The data link layer in the OSI model combine packets and bytes into frames and provides access to media using MAC address. Briefly describe three categories of basic data-link configurations. (6 marks)

3a What is the objective of the validation process and test metrics in WLAN Performance Metrics? (6 marks)

3b State at least three uses of TCP in wireless LAN (6 marks)

4a (i) What is the major function of predefined enterprise networks? (3 marks)

(ii) State three predefined enterprise networks that are created upon installation (3 marks)

4b. List any six typical project business requirements used in Effective Network Planning and Design (6 marks)

5a. Write short notes on the following common analog modulation techniques:

(i) Amplitude Modulation (AM) (2 marks)

(ii) Double-Sideband Modulation (DSB) (2 marks)

(iii) Single-sideband modulation (SSB, or SSB-AM), (2 marks) ]

5b. Explain briefly the following Digital Modulation Techniques:

(i) Amplitude-Shift Keying (ASK)

(ii) Frequency-Shift Keying (FSK)

(iii) Phase-Shift Keying (PSK) (6 marks)

6a. (i) What is Integrated Services Digital Network (ISDN)? (4 marks)

(ii) State one advantage of ISDN over other digital communications technologies (2 marks)

6b. (i) Itemize the three basic types of channels defined by ISDN Standards (4 marks)

6b (ii) Define a B channel as used in Integrated Services Digital Network. (2 marks)