Assignment 3
For this assignment, you need to answer questions based on Network Layer.
• Assignment submitted after due date will not be evaluated.
• Write answers in your own words.
• Materials copied from the Internet or otherwise will attract penalty as per course policy.
• Upload a pdf version of the document.

Due Date: 5 pm, October 28, 2014.
Submitting this Assignment
You will submit this assignment in Blackboard.
• Write your answer after each question in the document.
• Name the document as A2_CN2013_John_Doe.pdf in case your name is John Doe.
Grading Criteria
Correct and to-the-point answers will be awarded full points. This assignment has 15 points (with weightage of 3% in your overall 100 points).
1. Explain (in about 1000-1500 words) RIP, BGP and OSPF. Your explanation should clearly highlight the following points:
 Working of all the three protocols.
 Advantages and …show more content…
One idea is to use flooding. The routers keep a check on the packets by assigning them a sequence no. which is incremented for each new packet sent. When a new state packet arrives, it is checked against the list of already arrived list, if it is duplicate then that packet is discarded and if not then it is forwarded. Similarly if a packet with sequence number lower than the highest seen arrives then that packet is considered as obsolete.
With this procedure many problems were encountered:
a) If the sequence numbers wraps around then confusion can occur.
b) If a router crashes then it will lose track of its sequence number, then also problem can occur.
c) If a sequence number is corrupted, then also problem can occur.
To solve these problems age of packets is also included with sequence number which is decremented once after every second. When the age of the packet becomes zero then information from the router is