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ITC542 Internetworking With TCP/IP

tag 0 Download 8 Pages / 1,938 Words tag 13-07-2021


Part A

Answer the following short questions, briefly and clearly.

1. a) Compare and contrast CSMA/CD with CSMA/CA.
b) Give some advantages and disadvantages of the connectionless services overconnection-oriented services.
2. a) The Maximum Transmission Units (MTUs) range from 296 to 65,535 based onspecific protocol used by the system. What would be the advantages of havinga large MTU? What would be the advantages of having a small MTU? 
b) What is the purpose of including the IP header and the first 8 bytes of datagramdata in the error reporting ICMP messages?
3. a) Which ICMP messages contain part of the IP datagram? Why is this needed?
b)Make a table to compare and contrast error-reporting messages in ICMPv6 witherror reporting messages ICMPv4. 

Part B 

Answer the following numerical computation questions.

1. An organisation has been allocated the following block of classless addresses by its ISP.

List all the addresses in this range and identify those that can be used by the hosts (total host number and their IP address), the network address, the subnet mask and

the direct broadcast address. Show your calculations as detail as possible.

2. A router running RIP has a routing table with 20 entries.

a) How many periodic times are needed to handle this table? Justify your (2 marks)
b) How many expiration times are needed to handle this table? Justify your (2 marks)
c) How many garbage collection times are needed to handle this table if fiverouters are invalid? Justify your answer. (2 marks)

3. The following is a dump of a TCP header in hexadecimal format.

(05320017 00000001 00000000 500207FF 00000000)16

a) What is the source port number?
b) What is the destination port number?
c) What is the sequence number?
d) What is the acknowledgement number?
e) What is the length of the header?
f)  What is the type of the segment?
g) What is the window size?

Part C 

Answer the following case study questions.

1. As the network administrator for a growing Internet service provider (ISP), you want to make efficient use of your network addresses. One of the network addresses

Internet Assigned Numbers Authority (IANA) assigned to you a classless network of You have decided to use the network addresses to satisfy the IP address requirements of 16 corporate customers who need between 18 and 30 host addresses each. Without using a subnet calculator, calculate a subnet mask that meets their needs. List the subnet mask and all subnetwork addresses the mask will create.

2. You work at a help desk and have just received a call from an employee who says she can’t access network resources. You want the employee to view her IP address configuration. You wrote an e-mail to the employee, explaining what command-line program to use and how she can use it to find the information you need. After following your instructions, the employee tells you that her IP address is with the subnet mask What conclusion can you makefrom this information?

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