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61.
Which of the following devices can also provide web caching services?
- A.Proxy firewall
- B.Packet filtering firewall
- C.Stateful firewall
- D.Host-based firewall
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The proxy firewall can also offer web caching, should the same request be made again, and can increase the efficiency of data delivery. |
62.
Which of the following can read the individual commands of the protocols that are being
served?
- A.Stateful firewall
- B.Packet filtering firewall
- C.Application-level proxy
- D.Host-based firewall
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The proxy function can occur at either the application level or the circuit level. Application-level proxy functions read the individual commands of the protocols that are being served. This type of server is advanced and must know the rules and capabilities of the protocol used. |
63.
In which of the following devices are records kept using a table that tracks every communications
channel?
- A.Stateful firewall
- B.Packet filtering firewall
- C.Application-level proxy
- D.Host-based firewall
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| In stateful inspection (or stateful packet filtering), records are kept using a state table that tracks every communications channel. |
64.
In which operating system is iptables used?
- A.Windows
- B.Sun Solaris
- C.Linux
- D.Novell
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| On Linux-based systems, a common host-based firewall is iptables, replacing a previous package called ipchains. It has the ability to accept or drop packets. |
65.
Which of the following packets will be allowed according to the iptables rule that follows?
iptables -A INPUT -i eth1 -s 192.168.0.0/24 -j DROP
iptables -A INPUT -i eth1 -s 192.168.0.0/24 -j DROP
- A.A packet from 192.168.1.6/24
- B.A packet from 192.168.0.6/24
- C.A packet from 192.168.0.1/24
- D.A packet from 192.168.0.240/24
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| This rule set blocks all incoming traffic sourced from the 192.168.0.0/24 network, which is from 192.168.0.1–192.168.0.255. |
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