Introduction of Information Security Systems Cis4385

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  • Topic: IP address, Denial-of-service attack, Private network
  • Pages : 89 (15799 words )
  • Download(s) : 151
  • Published : March 30, 2013
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1.Which if the following IPv6 address type is assigned to multiple interfaces but packets will only be delivered to one?
a.Multicast
b.Anycast
c.Unicast
d.Broadcast

Grade:1
User Responses:b.Anycast
Feedback:a.An anycast address is assigned to a group of interfaces on multiple nodes. Packets are delivered to the “first” interface only.

2.Routers operate at which OSI layer?
a.Physical
b.Transport
c.Network
d.Session

Grade:1
User Responses:c.Network
Feedback:a.Routers operate at the network layer making routing decisions based on IP addresses.

3.Which of the following is NOT a private IPv4 address? Choose all that apply.
a.192.168.5.60
b.172.25.6.4
c.10.0.6.5
d.26.68.6.1

Grade:1
User Responses:d.26.68.6.1
Feedback:a.The private IP address ranges are as follows.
IP Class Assigned Range
Class A 10.0.0.0-10.255.255.255
Class B 172.16.0.0-172.31.255.255
Class C 192.168.0.0-192.168.255.255

4.What is a server that evaluates Internet requests from LAN devices against a set called?
a.Proxy
b.Firewall
c.Load balancer
d.NAT server

Grade:1
User Responses:a.Proxy
Feedback:a.A server that evaluates Internet requests from LAN devices against a set of rules is called a proxy server. NAT servers perform private to public address translation; load balancers manage traffic between cluster hosts; and a firewall filters traffic based on access control lists.

5.Which type of device maintains awareness of the status of connections, thereby preventing IP spoofing attacks?
a.Stateless packet filtering firewall
b.Stateful packet filtering firewall
c.NAT filter
d.Application-level gateway

Grade:1
User Responses:b.Stateful packet filtering firewall
Feedback:a.A stateful packet filtering firewall is one that monitors the state of each connection by examining the header of each packet. A stateless packet filtering firewall does not do this. NAT filters perform only private-to-public address translation. An application-level gateway provides protection to a specific application such as FTP.

6.Which of the following firewall services works at the session layer of the OSI model?
a.Application layer gateway
b.Stateful filtering
c.NAT
d.Circuit-level gateway

Grade:0
User Responses:c.NAT
Feedback:a.Circuit-level gateways work at the Session Layer of the OSI model and apply security mechanisms when a TCP or UDP connection is established; they act as a go between for the Transport and Application Layers in TCP/IP. After the connection has been made, packets can flow between the hosts without further checking. Circuit-level gateways hide information about the private network, but they do not filter individual packets.

7.Which of the following are the two main functions of a proxy server?
a.Caching of web pages
b.NAT
c.Domain authentication
d.DHCP

Grade:1
User Responses:a.Caching of web pages,c.Domain authentication
Feedback:a.A proxy server secures a network by keeping machines behind it anonymous; it does this through the use of NAT. It also improves web performance by caching web pages from servers on the Internet for a set amount of time./b.A proxy server secures a network by keeping machines behind it anonymous; it does this through the use of NAT. It also improves web performance by caching web pages from servers on the Internet for a set amount of time.

8.Which of the following devices can detect but not prevent attacks across the entire network?
a.NIDS
b.Host-based IDS
c.NIPS
d.Protocol Analyzer

Grade:1
User Responses:a.NIDS
Feedback:a.Network Intrusion Detection Systems (NIDS) detect but do not prevent attacks across the entire network. Host-based IDS can protect only the host on which it is installed. Network Intrusion Protection Systems (NIPS) can detect and prevent attacks across...
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