Homework 3

CIS 331: Network Introduction
Lehman College, City University of New York
Fall 2016

This Homework Is Due By 11:59 PM on Wednesday September 21, 2016

1. Given that a frame is formatted as follows:

   

   And given that an IP datagram is formatted as follows:

   

   And given the following frame with an encapsulated IP datagram:

   
   
   

   Find the source hardware address. Find the destination hardware address. What type of frame is this? What Flag(s) are set? What is the fragment offset? What is the TTL count? What is the Header Checksum? If the header includes no options or padding, what are the first five bytes of the datagram data? Find the destination IP address. What class is the destination IP address? What is the network ID in the destination address? What is the host ID in the destination address? Write the destination IP address in dotted decimal notation. Find the source IP address. What class is the source IP address? What is the network ID in the source address? What is the host ID in the source address? Write the source IP address in dotted decimal notation. Can this message be delivered directly by the source to the destination, or will it require routers to handle the message.

   The answers to these questions must be entered in Homework 3 (Numerical Questions) Updated




Explain how the ARP Protocol works. What problem does it solve? How does it solve the problem? Give examples and be as specific as possible. Suppose machine C receives an ARP request sent from A looking for target B, and suppose C has the binding for IPB to HWB in its ARP cache. Should C answer the request? Explain why or why not. Describe the message routing activity that we did in class with the index cards.

The answers to these questions must be entered in Homework 3 (Essay Questions)

Please submit the completed essay portion of this assignment on Blackboard as a typed Microsoft Word file (.doc or .docx) or a PDF file. No other forms of submission will be accepted.