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Question:
(a) Mention three limitations of a firewall.
(b) Compare packet-filtering and proxy-base firewalls. Give advantages and drawbacks of both.
(c) "Proxies effectively hide machines residing behind it from the Internet." Justify this statement.
(d) Which type of Intrusion Detection System (IDS) is only effective against known attack methods?
(e) Describe a Honeypot.
(f) Imagine you are the network manager of a company which uses a DMZ/firewall configuration to secure its connection to the Internet. You discover that an employee has attached a modem to his office phone line so that he can dial in to his desktop computer to get access to his files so he can work at home.
i. Is this a potential security risk for the company? Explain.
ii. What immediate action should you take in this situation?
iii. The employee has a legitimate need to work from home. How should you handle this?
Cipher Methods There are 2 methods of encrypting plaintext: • Bit stream method – every bit in the plaintext bit is transformed into a cipher bit one bit at a time. • Block cip
Question: (a) Explain how the Diffie-Hellman key establishment protocol works. (b) Prove that the Diffie-Hellman key establishment protocol is vulnerable to a `man in the mi
a) determine the RTT (round trip time) between a client requesting a web page of 1024 bytes in size from an internal web server on a 100 Base-T Ethernet. Assume a one-way propagati
(a) Figure is a representation of a TCP header. For each of the fields lettered from A to G, state the name of the field and provide a brief explanation for the function of each fi
Belady's Anomaly Also known FIFO anomaly. Generally, on raising the number of frames given to a process' virtual storage, the program execution is faster, because lesser page
W h a t do you understand by the terms security, network security and information security? How network security and information security are connected? Security can be def
Example : UCSF Medical Center In the year 2002, the University of California, San Francisco (UCSF) Medical Center received an email message from someone who claimed to be a doct
Firewalls A firewall in an information security program that prevents specific types of information from moving between the outside world and the inside world. The firewall may
a. PKI and PGP are two methods for generating and managing public keys for use in protocols such as secure email. Compare and contrast the trust models for public keys used in PKI
implementing password policy in organisation
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