Deck 9: Firewalls and Intrusion Prevention Systems

Question 1

An important aspect of a distributed firewall configuration is security
monitoring.

Answer 1

True

Question 2

The firewall may be a single computer system or a set of two or more
systems that cooperate to perform the firewall function.

Answer 2

True

Question 3

The countermeasure to tiny fragment attacks is to discard packets with
an inside source address if the packet arrives on an external interface.

Answer 3

False

Question 4

One disadvantage of a packet filtering firewall is its simplicity.

Question 5

The primary role of the personal firewall is to deny unauthorized
remote access to the computer.

Question 6

The firewall can protect against attacks that bypass the firewall.

Question 7

_________ control determines the types of Internet services that can be accessed,inbound or outbound.

A)Behavior
B)Direction
C)Service
D)User

Question 8

Unlike a firewall,an IPS does not block traffic.

Question 9

A packet filtering firewall is typically configured to filter packets going
in both directions.

Question 10

A firewall can serve as the platform for IPSec.

Question 11

_________ control determines the direction in which particular service requests may be initiated and allowed to flow through the firewall.

A)Behavior
B)User
C)Direction
D)Service

Question 12

Distributed firewalls protect against internal attacks and provide
protection tailored to specific machines and applications.

Question 13

A logical means of implementing an IPSec is in a firewall.

Question 14

_________ control controls how particular services are used.

A)Service
B)Behavior
C)User
D)Direction

Question 15

A traditional packet filter makes filtering decisions on an individual
packet basis and does not take into consideration any higher layer context.

Question 16

The _________ defines the transport protocol.

A)destination IP address
B)source IP address
C)interface
D)IP protocol field

Question 17

A DMZ is one of the internal firewalls protecting the bulk of the
enterprise network.

Question 18

A prime disadvantage of an application-level gateway is the additional
processing overhead on each connection.

Question 19

________ control controls access to a service according to which user is attempting to access it.

A)User
B)Direction
C)Service
D)Behavior

Question 20

Snort Inline enables Snort to function as an intrusion prevention
capability.

Question 21

The ________ IP address is the IP address of the system that originated the IP packet.

Question 22

The __________ protocol is an example of a circuit-level gateway implementation that is conceptually a "shim-layer" between the application layer and the transport layer and does not provide network-layer gateway services.

Question 23

__________ scans for attack signatures in the context of a traffic stream rather than individual packets.

A)Pattern matching
B)Protocol anomaly
C)Traffic anomaly
D)Stateful matching

Question 24

A _________ firewall applies a set of rules to each incoming and outgoing IP packet and then forwards or discards the packet.

Question 25

A __________ firewall controls the traffic between a personal computer or workstation on one side and the Internet or enterprise network on the other side.

Question 26

The _________ is inserted between the premises network and the Internet to establish a controlled link and to erect an outer security wall or perimeter to protect the premises network from Internet-based attacks.

Question 27

An example of a circuit-level gateway implementation is the __________ package.

A)application-level
B)SOCKS
C)SMTP
D)stateful inspection

Question 28

An intruder transmitting packets from the outside with a source IP address field containing an address of an internal host is known as IP address _________.

Question 29

A ________ uses encryption and authentication in the lower protocol layers to provide a secure connection through an otherwise insecure network,typically the Internet.

Question 30

__________ looks for deviation from standards set forth in RFCs.

A)Statistical anomaly
B)Protocol anomaly
C)Pattern matching
D)Traffic anomaly

Question 31

A __________ gateway sets up two TCP connections,one between itself and a TCP user on an inner host and one between itself and a TCP user on an outside host.

A)packet filtering
B)stateful inspection
C)application-level
D)circuit-level

Question 32

The _________ attack is designed to circumvent filtering rules that depend on TCP header information.

A)tiny fragment
B)address spoofing
C)source routing
D)bastion host

Question 33

Typical for SOHO applications,a __________ is a single router between internal and external networks with stateless or full packet filtering.

A)single bastion T
B)double bastion inline
C)screening router
D)host-resident firewall

Question 34

A ___________ makes use of both signature and anomaly detection techniques to identify attacks.

Question 35

__________ protocols operate in networking devices,such as a router or firewall,and will encrypt and compress all traffic going into the WAN and decrypt and uncompress traffic coming from the WAN.

Question 36

A _________ consists of a set of computers that interconnect by means of a relatively unsecure network and makes use of encryption and special protocols to provide security.

A)proxy
B)UTM
C)VPN
D)stateful inspection firewall

Question 37

Identified as a critical strong point in the network's security,the _________ serves as a platform for an application-level or circuit-level gateway.

Question 38

A _________ configuration involves stand-alone firewall devices plus host-based firewalls working together under a central administrative control.

A)packet filtering firewall
B)distributed firewall
C)personal firewall
D)stateful inspection firewall

Question 39

Typically the systems in the _________ require or foster external connectivity such as a corporate Web site,an e-mail server,or a DNS server.

A)DMZ
B)IP protocol field
C)boundary firewall
D)VPN

Question 40

__________ are attacks that attempt to give ordinary users root access.

A)Privilege-escalation exploits
B)Directory transversals
C)File system access
D)Modification of system resources

Question 41

__________ anomaly watches for unusual traffic activities,such as a flood of UDP packets or a new service appearing on the network.

Question 42

A single device that integrates a variety of approaches to dealing with network-based attacks is referred to as a __________ system.

Question 43

The firewall follows the classic military doctrine of _________ because it provides an additional layer of defense.

Question 44

Snort Inline adds three new rule types: drop,reject,and _________.

Question 45

_________ matching scans incoming packets for specific byte sequences (the signature)stored in a database of known attacks.