1. What is the difference between a packet-filtering firewall and a proxy-server firewall? Can the two be used together? 2. What are the four tables maintained by the Linux kernel for processing incoming and outgoing packets?
3. How does an iptables based firewall decide as to which packets to subject to the INPUT chain of rules, which to the FORWARD chain of rules, and which to the OUTPUT chain of rules? Additionally, which part of a packet is examined in order to figure out whether or not the condition part of a rule is satisfied?
4. Show how you would use the iptables command to reject all incoming SYN packets that seek to open a new connection with your machine?
5. What is the option given to the iptables command to flush all the user-defined chains in a table? How do you flush all the rules in a table?
6. What are the icmp-types associated with the echo-request (ping) and with the echo-reply (pong) packets?
7. What is the iptables command if you want your machine to accept only the incoming connection requests for the SSHD server you are running on your machine? (You want your machine to drop all other connection request packets from remote clients.)
8. What is connection tracking? How does an iptables-based firewall know that the incoming packets all belong to the same ongoing connection?

True or false? is that the question

Answereither by value or by reference;

Give me some options and i would be happy to

Evidenceinformation gathered from credible research sources that a speaker support his or her claims.encyclopediaa reference work that offers relatively brief entries providing background information on a wide range of alphabetized topics.peer reviewthe act of subjecting articles submitted to a scholarly journal to critical readings by other experts in a particular field.dictionarya reference work that offers definitions, pronunciation guides, and sometimes etymologies for wordsquotation booka reference work offering famous or notable quotations on a variety of subjectswhat advantages do libraries offer over the internet? libraries allow you access to strong evidence and credible sources that are not available on web sites.describe the advantages and disadvantages of internet research.advantages: allows you convenient access to information on nearly any topic & offers speed-- enabling you to track down a news report or a research finding almost instantly from anywhere in the world. and puts an immense volume of information at our fingertipsdisadvantages: books may not be available online from credible sources, may cost money. cannot assume that information online is credible. anyone can create a website or blog about a topic! what four key characteristics determine a source's credibility? capacityrecency