Chapter 11 Quiz

Question:

The chapter discusses five cross-layer modules. What does it mean to be cross layer? Name and briefly describe the 2 of these modules. (Based on Logan)

Answer:

This is a module which interacts with more than one layer in it's operation.

ARP - Used to determine which MAC address has a specific IP address

DHCP - Gives an IP address to a MAC address

DNS - Translate a human-readable domain name to an IP address

ICMP - Diagnostic tool that allows for things such as ping to determine if an IP address is reachable and traceroute to determine the route to an IP address.

Routing - Used to discover how to forward a packet to every reachable IP address. The router knows the IPs and IP ranges that it directly supports, and shares this knowledge with its neighbor. The neighbord adds its own knowledge and again passes it on. This repeats until every address is known.

Discussion:

  1. The book stays that IPv6 does not support fragmentation and reassembly, what are the implications of this?
  2. The reading mentions Gray Hole Deletion attacks. How is it possible to guard against such an attack, or even to find it when it happens?
  3. How many of the methods described in the book are currently in use? Are they universal or just good practice that is rarely fully implemented?
  4. In talking about what order to apply the encryption information and forgery detection tags, the book says you can do either one first or both simultaneously (giving SSH as an example). That doesn’t seem possible to me.
  5. What layer is the most vital?
  6. How do you defend against eavesdropping?
  7. The book stays that IPv6 does not support fragmentation and reassembly, what are the implications of this?
  8. The reading mentions Gray Hole Deletion attacks. How is it possible to guard against such an attack, or even to find it when it happens?
Topic revision: r3 - 2014-03-10 - JimSkon
 
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