Problem 43
In what way could TCP be considered a better protocol for implementing the transport layer than UDP? In what way could UDP be considered better than TCP?
Problem 44
What does it mean to say that TCP is a connection-oriented protocol?
Problem 45
At what layer in the TCP/IP protocol hierarchy could a firewall be placed to filter incoming traffic by means of a. Message content b. Source address c. Type of application
Problem 46
Suppose you wanted to establish a firewall to filter out email messages containing certain terms and phrases. Would this firewall be placed at your domain's gateway or at the domain's mail server? Explain your answer.
Problem 47
What is SSL and what are its benefits?
Problem 48
What is the significance of using spam filters?
Problem 49
What is the significance of certificate authorities in public-key encryption? 50\.
