Systems Security Certified Practitioner – SSCP – Question1026

Which of the following best defines source routing?

A. The packets hold the forwarding information so they don't need to let bridges and routers decide what is the best route or way to get to the destination.
B. The packets hold source information in a fashion that source address cannot be forged.
C. The packets are encapsulated to conceal source information.
D. The packets hold information about redundant paths in order to provide a higher reliability.

Correct Answer: A

Explanation:

With source routing, the packets hold the forwarding information so that they can find their way to the destination themselves without bridges and routers dictating their paths.
In computer networking, source routing allows a sender of a packet to specify the route the packet takes through the network.
With source routing the entire path to the destination is known to the sender and is included when sending data. Source routing differs from most other routing in that the source makes most or all of the routing decisions for each router along the way.
Source: WALLHOFF, John, CISSP Summary 2002, April 2002, CBK#2 Telecommunications and Network Security (page 5)
Wikipedia at http://en.wikipedia.org/wiki/Dynamic_Source_Routing