You are the Network Administrator for a startupcom

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You are the Network Administrator for a startupcompany that has been granted a new block of addresses starting with the address 139.145.56.0/22. Calculate the total number of addresses available in this block including all the special addresses. Show your

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Question 1  – Routing table construction                                                    (10 marks)

Given the following network, construct the routing table for routersR2 and R3.

Question 2– Allocating subnets from a block                                                         (6 marks)

You are the Network Administrator for a startupcompany that has been granted a new block of addresses starting with the address 139.145.56.0/22.

1. Calculate the total number of addresses available in this block including all the special addresses. Show your calculation (1 mark)

 

1. As Network Administrator, you need to distribute the available addresses on a departmental needs basis (meaning not allocating more than you have to),with 4 new subnets determined as follows:

Create the 4 subnets.  For each subnet, list the subnet or first address, the last address, and the subnet mask in CIDR format.  Show your calculations for all subnets, briefly showing how you arrived at the sub-block addresses.   (4 marks or 1 mark for each correct subnet)

 

1. How many addresses are left unallocated? Show your calculation. (1 mark)

 

Question 3 – Fragmentation                                                                                     (4 marks)

An IPdatagram5,600 bytes long (including header with no options) arrives at a router, which determines that the next destination has an MTU of 1,500 bytes.Answer the following questions, showing your calculations and reasoning.

2. Assuming that the router decides to fragment the packet into 4 fragments, for each fragment, determinea correct size, and identify the starting byte and ending byte(2.5 marks).
3. Calculate the fragmentation offset for each fragment(1 mark).
4. The total number of bytes from all 4 fragments leaving the router should be greater than the initial datagram size that arrived. Explain why this is so(.5 mark).

Hints:  Working out part (a) can be a fiddly (messy) exercise and you may find it helpful to use a spreadsheet to work out appropriate sizes and offsets. Remember that the offset needs to be evenly divisible by 8, as explained in the textbook.  You may need to do additional reading to understand the process if it is unclear to you – Forouzan is a good place to start.   

 

Question 4: Advanced routing study                                                           (15 marks)

Research and review appropriate materials, including the textbook, and answer the first two questions (a & b).

 

1. Define the terms and discuss the relationship between Autonomous Systems, Inter-domain routing, and Intra-domain routing(2 marks).

 

1. Identify the major routing protocols associated with Inter-domain and Intra-domain routing and list their similarities and differences (1.5 marks). Finish by commenting on why we need different protocols for Inter-domain and Intra-domain routing(1.5 marks).

 

Study the two articles listed below – both are freely available on the Internet.  You may use other references in addition to these, as needed.  Then answer the remaining 3 questions (c, d & e). 

 

1. Briefly summarize in your own words the problems with current routing methods that the authors have identified. (5 marks)
2. Contrast and compare the concepts of embedded routing and extensible routing. (2.5 marks)
3. How does the proposal of Routing As A Service (RAAS or just RAS) address the problems with current routing methods? (2.5 marks)

Referencing:  List all references and use proper in-text citation using the Harvard referencing convention.   Remember that diagrams also need to be cited.  Marks will be deducted on a per-question basis for not adhering to referencing standards.

The two articles for questions 3 – 5 (both articles have the same title):