# Networking Lectures 1 to 4

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Data Communication and Network Comps Assignment 1 Khoa Le - s3103004 Question 1. a) Why is the transport layer not present inside the core network? Marks 3 ● Core Network is the internetworking of routers. ● Transport layer deals with communication between applications. ● The transport layer is not present because it provides additional functions to the core network to compensate for the limitation of the core network layer. ○ In the case of TCP/IP protocol, the Transport Layer provide more complex services such as flow control or connection­oriented data stream transfer to increase the reliability of the data as it is sent through the network. ● By keeping these layers separate, the transport layer is able to provide a uniform…show more content…
Growth: 200 LANs with 200 Hosts each. ● After Year 1: ○ 200+10% = 200+(100*0.1) = 220 LANs ○ 200+10% = 200+(240*0.1) = 220 HOSTs ● After Year 2: ○ 220+10% = 220+(220*0.1) = 242 LANs ○ 220+10% = 220+(220*0.1) = 242 HOSTs Class B = 16 bits for Network and 16 bits for the Host. Since subnet would work for the Host part only, hence the subnet would be: 111111111.111111111.XXXXXXXX.XXXXXXXX = 255.255.XXXXXXXX.XXXXXXXX Number of LANs = 242 (2^7 = 128 and 2^8 = 256, hence we select 2^8) Therefore, 8 bits are required to represent the LANs Number of Hosts = 242 (2^7 = 128 and 2^8 = 256, hence we select 2^8) Hence, ● 8 bits are required to represent 242 LANs and ● 8 bits are required to represent the 242 Hosts 11111111 00000000 = XXXXXXXX.XXXXXXXX LANs HOSTs Hence, the subnet would be 11111111.11111111.11111111.00000000 = 255.255.255.0 ii) La Trobe University: 55 LANs with 400 hosts/LAN, Class B with no growth in the next 5 years.