What data compression standard uses Lempel–Ziv encoding? Describe how it works.
> How can network costs be reduced?
> Why is the TCO so high?
> What is TCO?
> What are the primary functions of end user support?
> What is the purpose of multiplexing?
> What are the advantages and disadvantages of host-based networks versus client–server networks?
> What is problem escalation?
> How is network availability calculated?
> What is an SLA?
> Several important statistics related to network uptime and downtime are discussed in this chapter. What are they, and why are they important?
> What skill does a network manager need?
> Why is it important to identify improvements that are needed to mitigate risks?
> What are the possible risk control strategies? How do we pick which one to use?
> What is the purpose of the risk score, and how is it calculated?
> Explain the purpose of threat scenarios. What are the steps in preparing threat scenarios?
> Although it is important to protect all servers, some servers are more important than others. What server(s) are the most important to protect and why?
> What is the term used to describe the placing of two or more signals on a single circuit?
> What is one of the major risks of downloading unauthorized copies of music files from the Internet (aside from the risk of fines and lawsuits)?
> Some experts argue that CERT’s posting of security holes on its website causes more security break-ins than it prevents and should be stopped. What are the pros and cons on both sides of this argument? Do you think CERT should continue to post security h
> Most hackers start their careers breaking into computer systems as teenagers. What can we as a community of computer professionals do to reduce the temptation to become a hacker?
> A few security consultants have said that fast Internet and wireless technologies are their best friends. Explain.
> What are the most common security threats? What are the most critical? Why?
> What is a honey pot?
> What is computer forensics?
> How does IPS anomaly detection differ from misuse detection?
> What is an IPS?
> What techniques can be used to reduce the chance that social engineering will be successful?
> What is quantizing error?
> What is social engineering? Why does it work so well?
> Why the management of user profiles an important aspect of a security policy?
> Explain how a biometric system can improve security. What are the problems with it?
> What are the different types of two factor authentication methods and how do they work?
> What are the three major ways of authenticating users? What are the pros and cons of each approach?
> What are some of the criteria that can be used to rank security risks?
> How does SSL differ from IPSec?
> How does PGP differ from SSL?
> What is a Certificate Authority (CA)?
> What is PKI, and why is it important?
> Explain how pulse code modulation (PCM) works.
> Explain how authentication works.
> Compare and contrast DES and public key encryption.
> How does DES differ from 3DES? From AES?
> What is key management?
> Describe how asymmetric encryption and decryption work.
> Describe how symmetric encryption and decryption work.
> Name and describe the main impact areas. Who should be responsible for assessing what is meant by low/medium/high impact for each of the impact areas? Explain your answer.
> Compare and contrast symmetric and asymmetric encryption.
> Explain how a Trojan horse works.
> What is a security hole, and how do you fix it?
> What is a NAT firewall, and how does it work?
> What is IP spoofing?
> How do the different types of firewalls work?
> What is a firewall?
> What is a sniffer?
> What is eavesdropping in a computer security sense?
> What is physical security, and why is it important?
> Briefly outline the steps required to complete a risk assessment.
> How do you secure the network perimeter?
> What are major aspects of intrusion prevention?
> Some experts argue that thin-client client–server architectures are really host-based architectures in disguise and suffer from the same old problems. Do you agree? Explain.
> There are many components in a typical security policy. Describe three important components.
> People who attempt intrusion can be classified into several different categories. Describe them.
> What is online backup?
> What is a disaster recovery firm? When and why would you establish a contract with them?
> How does a denial-of-service attack differ from a distributed denial-of-service attack?
> Explain how a denial-of-service attack works.
> What is a computer virus? What is ransomware?
> What is the purpose of a disaster recovery plan? What are five major elements of a typical disaster recovery plan?
> What factors have brought increased emphasis on network security?
> How does a DSL modem differ from a DSLAM?
> Which of the common application architectures for email (two-tier client–server, Web-based) is “best”? Explain.
> Explain how DSL works.
> Compare and contrast cable modem and DSL.
> What type of circuits are commonly used to build the Internet today? What type of circuits are commonly used to build Internet 2?
> Explain one reason why you might experience long response times in getting a Web page from a server in your own city.
> What is a POP?
> What is an IXP?
> Many experts predicted that small, local ISPs would disappear as regional and national ISPs began offering local access. This hasn’t happened. Why?
> Would you be interested in subscribing to 100 Mbps FTTH for a monthly price of $100? Why or why not?
> Today, there is no clear winner in the competition for Broad-band Internet access. What technology or technologies do you think will dominate in 2 years’ time? Why?
> What is a giga-pop?
> Compare and contrast the application architecture for video conferencing and the architecture for email.
> What is Internet2®?
> Explain how the Internet is a network of networks.
> What is the principal American organization working on the future of the Internet?
> How is the IETF related to the IRTF?
> What are the principal organizations responsible for Internet governance, and what do they do?
> Explain how WiMax works.
> What are some future technologies that might change how we access the Internet?
> Explain how FTTH works.
> Which is better, cable modem or DSL? Explain.
> What is an OE converter? A CMTS?
> Explain how Instant Messaging (IM) works.
> Explain how a cable modem works.
> Explain how ADSL works.
> What is the basic structure of the Internet?
> Describe SONET. How does it differ from SDH?
> Distinguish among T1, T2, T3, and T4 circuits.
> What are the most commonly used T carrier services? What data rates do they provide?
> Compare and contrast ring architecture, star architecture, and mesh architecture.
