Question

Compare and contrast static and dynamic routing. Describe the two types of dynamic Routing Protocols (elaborate each to some extent).

Explain how digital signature can ensure message integrity and nonrepudiation. Explain each of the two mechanisms clearly.

Answer 1

A 1 -

Static Routing is a user defined routing which is Non-Adaptative. It means that the network routing table does not change until the administrator changes it by their own.Static routing provides more security as it is manual by nature. Static Routing does not uses complex algorithm to chose shortest path.Static Routing is Complete Manual process. Static Routing can be used in smaller networks. Static Routing does not needs resources to run.

Dynamic Routing is Adaptative as it changes the routing table according to network changes. It is less secure than Static Routing. Dynamic Routing uses complex algorithms such as BGP, RIP, EIGRP. Dynamic Routing is Automated process. Dynamic Routing is implemented on larger networks. Dynamic Routing needs additional resources like memory, Bandwidth.

A 2 - A digital signature is used to verify the integrity and authenticity of a message. It uses public key cryptography techniques with combined hash functions to increase security to a message. It also can be used to provide non-repudation functions.Digital Signature uses Signature algorithms and hash algorithms as security mechanisms. Whenever a message gets encrypted with a user's private key, the hash value which is created becomes the signature for the message. Hash mechanism can be achieved by combining trusted time-stamping mechanism.

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