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COMP247 Data Communications

tag 0 Download 7 Pages / 1,660 Words tag 13-07-2021

Questions:

Question 1 Transport Layer

a) As we have seen, the Internet layer of TCP/IP has two protocols – IPv4 and IPv6. The transport layer provides two main protocols TCP and UDP (along with some special-purpose, minor protocols). But these are for very different reasons. Why are the Internet and Transport layers very different in providing two protocols?

b) Since UDP does very little that is different from IP, why do we even have a transport layer such as UDP?

c) Describe how DDoS attacks may be mounted against TCP and UDP service . In what way will being connection oriented be different for TCP and UDP?

Question 2 – IP Addressing
 
a) Perform the following boolean operations on the given bit patterns 
i. not 11100010
ii. 11100010 or 00001110
iii. 11100010 and 00001110
 
b) What are the subnet masks for the following slash address blocks?
i. 9
ii. 17
iii.31

c) Are the following address masks legal? If so, what are their slash forms? If not, why are they not legal?
i. 255.255.248.0
ii. 255.224.252.0
iii. 255.255.255.224
iv. 255.255.156.0

d) How many computers are in networks with the following address blocks?
i.13
ii. 26

e) A small company is assigned the class C network 205.67.35.0. You need to divide this network to provide subnets for three departments using fixed-length subnetting. The departments are approximately the same size. Show the network and broadcast addresses for each subnet. Show the slash notation. How many hosts are on each subnet? Are the resulting subnets class C networks? 
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