IT430 Assignment Solution

Q1: Write down the functionality of Hub, Bridges, Routers, Repeaters and Switches; also write down on which layers of OSI model these network devices work?    [5*2 = 10]

Name	Functionality	OSI Model Layer
Hub	Provide central connection point for LAN computers.	Physical layer
Bridges	It is combination of software and hardware having own operating system, helps in conservation of network bandwidth. Bridges physically chopped up large network into small segments.	Data link layer
Routers	Routers are combination of software and hardware to forward data packets on the network. These are more efficient and sophisticated. It logically divide network into small segments, i.e subnets on the basis of IP addressing scheme.	Network Layer
Repeaters	It regenerates and amplifies the received signals.	Physical layer
Switches	It is also combination of software and hardware. It have own operating system, switches also increase the bandwidth of network. It virtually divide network into small segments, i.e VLANs.	Data link layer

Q2: Perform the conversions          [5*2 = 10]

 (a) 110                                           Decimal to Binary

2	110
2	55	0
2	27	1
2	13	1
2	6	1
2	3	0
	1	1

Decimal to Binary
110 = 1101110

(b) 10011000                                 Binary to Decimal

2⁰*0 + 2¹*0 + 2²*0 + 2³*1 + 2⁴*1 + 2⁵*0 + 2⁶*0 + 2⁷*1

= 0+0+0+8+16+0+0+128

= 152

(c) 11011100                                 Binary to Decimal

2⁰*0 + 2¹*0 + 2²*1 + 2³*1 + 2⁴*1 + 2⁵*0 + 2⁶*1 + 2⁷*1

= 0+0+4+8+16+0+64+128

= 220

(d) 11111100                                 Binary to Decimal

2⁰*0 + 2¹*0 + 2²*1 + 2³*1 + 2⁴*1 + 2⁵*1 + 2⁶*1 + 2⁷*1

= 0+0+4+8+16+32+64+128

= 252

(e) 3009                                         Decimal to Binary

2	3009
2	1504	1
2	752	0
2	376	0
2	188	0
2	94	0
2	47	0
2	23	1
2	11	1
2	5	1
2	2	1
	1	0

3009 = 101111000001