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COIT20261 Network Routing And Switching

tag 0 Download 5 Pages / 1,215 Words tag 27-07-2021


Question 1 :Routing table construction

Given the following network, construct the routing table for routers R2 and R3.  

Question 2: Allocating subnets from a block

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

b)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:

c)How many addresses are left unallocated? Show your calculation.

Question 3: Fragmentation

a)Assuming that the router decides to fragment the packet into 4 fragments, for each fragment, determine a correct size, and identify the starting byte and ending byte.

b)Calculate the fragmentation offset for each fragment.

c)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.

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

a)Define the terms and discuss the relationship between Autonomous Systems, Inter-domain routing, and Intra-domain routing.

b)Identify the major routing protocols associated with Inter-domain and Intra-domain routing and list their similarities and differencesFinish by commenting on why we need different protocols for Inter-domain and Intra-domain routing.

c)Briefly summarize in your own words the problems with current routing methods that the authors have identified.

d)Contrast and compare the concepts of embedded routing and extensible routing.

e)How does the proposal of Routing As A Service (RAAS or just RAS) address the problems with current routing methods?

Question 5: IPv6 Packets

An IPv6 packet travelling within an Autonomous System, consists of a base header, extension headers, a TCP segment and data.   The data is 128,000 bytes long (jumbo payload).

Determine a correct or valid value for the following fields in the base header with a brief explanation of the value you selected.   Note: the brief explanation is half the marks.

  • Version;  
  • Payload Length;   
  • Next Header;  
  • Hop limit:  

Do not type your answers here: type it in the Answers Template provided.

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