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What refers to legitimate users accessing networked services that would normally be restricted to them?
Unauthorized access of restricted network services by the circumvention of security access controls is known as logon abuse. This type of abuse refers to users who may be internal to the network but access resources they would not normally be allowed.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 74).
Which of the following layers provides end-to-end data transfer service?
It is the Transport Layer that is responsible for reliable end-to-end data transfer between end systems.
The following answers are incorrect:
Network Layer. Is incorrect because the Network Layer is the OSI layer that is responsible for routing, switching, and subnetwork access across the entire OSI environment.
Data Link Layer. Is incorrect because the Data Link Layer is the serial communications path between nodes or devices without any intermediate switching nodes.
Presentation Layer. Is incorrect because the Presentation Layer is the OSI layer that determines how application information is represented (i.e., encoded) while in transit between two end systems.
What is called the probability that a threat to an information system will materialize?
The Answer: Risk: The potential for harm or loss to an information system or network; the
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Pages 16, 32.
What is the proper term to refer to a single unit of Ethernet data at the link layer of the DoD TCP model ?
Ethernet is frame based network technology.
See below a few definitions from RFC 1122:
Segment:
A segment is the unit of end-to-end transmission in the TCP protocol. A segment consists of a TCP header followed by application data. A segment is transmitted by encapsulation inside an IP datagram.
PACKET:
A packet is the unit of data passed across the interface between the internet layer and the link layer. It includes an IP header and data. A packet may be a complete IP datagram or a fragment of an IP datagram.
FRAME:
A frame is the unit of transmission in a link layer protocol, and consists of a link-layer header followed by a packet.
The following answers are incorrect:
Ethernet segment. Is incorrect because Ethernet segment is a distractor, TCP segment would be the correct terminology. Ethernet is a frame based network technology,
Ethernet datagram. Is incorrect because Ethernet datagram is a distractor, IP datagram would be the correct terminology. Ethernet is a frame based network technology
Ethernet packet. Is incorrect because Ethernet packet is a distractor, a Packet is a group of information so would not be a 'single unit'. Ethernet is a frame based network technology.
Look at the diagrams below that were extracted from my Security+ Computer Based Tutorial.
TCP/IP Data Structures
IMPORTANT NOTE:
The names used on the diagram above are from RFC 1122 which describe the DOD Model.
TCP/IP Data Structure
The following Reference(s) were used for this question:
Wikipedia http ://en.wikipedia.org/wiki/Ethernet
http ://en.wikipedia.org/wiki/Ethernet
Which of the following are REGISTERED PORTS as defined by IANA ?
Ports 1024 to 49151 has been defined as REGISTERED PORTS by IANA.
A registered port is a network port (a sub-address defined within the Internet Protocol, in the range 1--65535) assigned by the Internet Assigned Numbers Authority (IANA) (or by Internet Corporation for Assigned Names and Numbers (ICANN) before March 21, 2001) for use with a certain protocol or application.
Ports with numbers lower than those of the registered ports are called well known ports; ports with numbers greater than those of the registered ports are called dynamic and/or private ports.
Ports 0-1023 - well known ports
Ports 1024-49151 - Registered port: vendors use for applications
Ports >49151 - dynamic / private ports
The other answers are not correct
Reference(s) used for this question:
http:// en.wikipedia.org/wiki/Registered_port
http:// en.wikipedia.org/wiki/Registered_port
